Researcher Database

Masaoki Takagi
Faculty of Science Biological Sciences Biodiversity
Professor

Researcher Profile and Settings

Affiliation

  • Faculty of Science Biological Sciences Biodiversity

Job Title

  • Professor

ORCID ID

J-Global ID

Research Interests

  • 保全生態学   Avian Ecology   Island Biology   Bioacoustics   Biogeography   Ornithology   Animal Ecology   

Research Areas

  • Life sciences / Evolutionary biology
  • Life sciences / Ecology and environmental science
  • Life sciences / Biodiversity and systematics
  • Environmental science/Agricultural science / Biological resource conservation

Education

  •        - 1997/03  Hokkaido University
  •        - 1997  Hokkaido University  Graduate School, Division of Agriculture

Association Memberships

  • 日本鳥学会   日本生態学会   

Research Activities

Published Papers

  • Reversed sexual size dimorphism in the Ryukyu Scops Owl Otus elegans on Minami-daito Island
    Akira Sawada, Tetsuya Iwasaki, Taro Matsuo, Kana Akatani, Masaoki Takagi
    Ornithological Science 20 (1) 2021/01 [Refereed][Not invited]
  • Effects of habitat use on food acquisition and food caching during a nonbreeding season in a winter-breeding, food-storing passerine
    Nishida Yusuke, Masaoki Takagi
    Bird Study 2020/08 [Refereed][Not invited]
  • Akira Sawada, Haruko Ando, Masaoki Takagi
    Journal of Evolutionary Biology 2020/04/13 [Refereed][Not invited]
  • Kana Akatani, Masaoki Takagi
    The Wilson Journal of Ornithology 131 (4) 828 - 828 1559-4491 2020/01/20 [Refereed][Not invited]
  • Shingo Uemura, Ayumu Hamachi, Kunihiro Nakachi, Masaoki Takagi
    Ornithological Science 18 (2) 215 - 219 1347-0558 2019/07 [Refereed][Not invited]
  • Yuusuke Nishida, Masaoki Takagi
    Animal Behaviour 152 29 - 37 0003-3472 2019/06 [Refereed][Not invited]
  • A. Sawada, T. Iwasaki, M. Takagi
    Journal of Zoology 307 (3) 159 - 166 0952-8369 2019/03/13 [Refereed][Not invited]
  • Kana AKATANI, Masaoki TAKAGI
    Journal of the Yamashina Institute for Ornithology 50 (2) 125 - 128 1348-5032 2019/02/28 [Refereed][Not invited]
  • Vocalizations of the Ryukyu Scops Owl: individually recognisable and stable
    Masaoki TAKAGI
    Bioacoustics https://doi.org/10.1080/095246 0952-4622 2018/11 [Refereed][Not invited]
  • Yusuke Nishida, Takagi Masaoki
    Journal of Avian Biology https://doi.org/10.1111/jav.01 1600-048X 2018/07 [Refereed][Not invited]
  • Junpei Sawada, Masaoki Takagi
    Ornithological Science 17 (1) 109 - 112 1347-0558 2018 [Refereed][Not invited]
     
    We found five Ruddy-breasted Crake Porzana fusca nests in a swamp among emergent vegetation, and one in a dry sugarcane field more than 500 m (radius) from any swamp or pond, on Minami-daito Island. Nests were saucer-shaped. All of the nests in the swamp fledged chicks. It is assumed that nesting in such habitat renders nests safe from ground predators such as introduced weasels and feral cats. Roosts were similar in structure to nests, but lacked lining. It is inferred from one observation that males and females roost together at night before the egg-laying period.
  • Akira Sawada, Takeshi Yamasaki, Yasuko Iwami, Masaoki Takagi
    Ornithological Science 17 (1) 45 - 54 1347-0558 2018 [Refereed][Not invited]
     
    Morphological differentiation of island-dwelling organisms provides model systems for studying evolution. Computed tomography (CT) scanning is an entirely non-destructive technique that provides detailed three-dimensional (3D) images of physical structures. Geometric morphometrics has been increasingly used in avian morphology studies by analyzing 3D data obtained from CT scans. We used geometric morphometrics to evaluate the morphological details of the skulls of three, genetically distinct, island populations of the Ryukyu Scops Owl Otus elegans: O. e. elegans from the northern part of the Ryukyu Archipelago, O. e. elegans from the southern part of the Ryukyu Archipelago, and O. e. interpositus from Minami-daito Island. Skulls were scanned using an X-ray CT system and the digitized 3D coordinates of 16 landmarks for each skull were analyzed in order to describe geometric morphometric features. O. e. interpositus was found to have a significantly smaller skull than either population of O. e. elegans. From principle component analysis of shape variation, we also found that the skull shape of O. e. interpositus differed significantly from both the northern and southern groups of O. e. elegans. This difference was in terms of PC1, which mainly represented relative anteroposterior length, and angle of the orbit. We inferred that the small skull of O. e. interpositus is partly a consequence of the particular founders of the population, or evolutionary selection that has taken place on Minami-daito Island and that the distinctive shape of the skull of O. e. interpositus is partly a consequence of adaptations for foraging efficiency, or of morphological integration.
  • Shin Matsui, Masaoki Takagi
    ORNITHOLOGICAL SCIENCE 16 (1) 79 - 86 1347-0558 2017/01 [Refereed][Not invited]
     
    Since the 1970s the Bull-headed Shrike Lanius bucephalus has established a breeding population on the Daito Islands. The islands represent the southwestern limit of the species' breeding range. We investigated the habitat selection of this isolated population during the 2003 breeding season in the agricultural landscape of Minami-daito Island. A comparison of habitat types around shrike nests and randomly selected points, showed that shrikes largely foraged in sugarcane fields and utilized fences and utility wires as suitable perch sites. Our results suggest that it is the open, cultivated areas (sugarcane has been grown on the island since 1900) that have provided suitable habitat for the Bull-headed Shrike allowing it to establish a breeding population on the Daito Islands.
  • Hamachi Ayumu, Uemura Shingo, Nakachi Kunihiro, Takagi Masaoki
    Bird Research 13 (0) S27 - S33 1880-1587 2017 [Refereed][Not invited]
  • Masaoki Takagi, Takema Saitoh, Noriyuki Yamaguchi, Hiroto Okabe, Isao Nishiumi, Masayoshi Takeishi
    ORNITHOLOGICAL SCIENCE 14 (1) 53 - 59 1347-0558 2015/01 [Refereed][Not invited]
     
    A nest of the Ryukyu Scops Owl Otus elegans was found on Okinoshima (Okino Island), Fukuoka Prefecture, Japan (34.24 degrees N, 130.10 degrees E), in the Tsushima Strait, on 28 July 2013. The breeding pair and their three owlets were caught and their identity confirmed genetically using the BOLD System for COI in the mitochondrial genome. Their calls and external morphological measurements also accorded with what is known of the species. We estimated that at least 23 territorial males inhabit the Island. Okinoshima lies 490 km beyond the previously known northern limit of the species' distribution.
  • YOSHINO Tomoo, HAMA Natsuki, ONUMA Manabu, TAKAGI Masaoki, SATO Kei, MATSUI Shin, HISAKA Mariko, YANAI Tokuma, ITO Haruo, URANO Nobutaka, OSA Yuichi, ASAKAWA Mitsuhiko
    酪農学園大学紀要 自然科学編(Web) 38 (2) 139 - 148 2187-0500 2014/04 [Refereed][Not invited]
  • Masaoki Takagi
    WILSON JOURNAL OF ORNITHOLOGY 125 (2) 358 - 369 1559-4491 2013/06 [Refereed][Not invited]
     
    The Ryukyu Scops Owl, Otus elegans, is distributed over a 1,200-km area, only inhabiting islands. Within this range, I studied this species across 20 continental islands in the Ryukyu Archipelago and two oceanic islands. Although most studies recently use quantitative continuous measurements of many specific aspects of the vocalization, I introduced a new method, "typological analysis" to visually classify variation of spectrograms according to the shape of syllable in the owl species, examining their dialects in relation to their geographical distribution. In the typological analysis, hoot, syllable, and element types were defined according to the number of syllables, the degree of timescale overlap of the first and second elements in the second syllable, and relative differences of duration and frequency of two elements in the second syllable, respectively. Although frequencies of hoot and element types in each island population were significantly different between the island groups north and south of the Kerama Gap across the archipelago, hoot and element types were shared between the island groups. Furthermore, typological variation occurred in syllable types, however there were no differences in frequencies of syllable types between the island groups. Geographic structure in vocal parameters as steep clines with stepped variation is represented as a dialect. According to the definition, this study found that no unique dialects in hoots occurred between the different island populations of Ryukyu Scops Owls. The Kerama Gap might act as a biogeographical barrier, contributing to the differentiation between owl hoots according to spectrotemporal analyses; however, the typological analysis detected the distribution of typological characteristics of hoots on the small islands north of the Kerama Gap that contradicts this concept of a biogeographical barrier. Because the typological analysis needs to visually examine each individual by careful attention to detail, it is a good method for discovering minor geographic variations and patterns in bird vocalizations.
  • Naoki Tomita, Masaoki Takagi
    WILSON JOURNAL OF ORNITHOLOGY 125 (1) 121 - 127 1559-4491 2013/03 [Refereed][Not invited]
     
    We investigated the amount of time Black-tailed Gulls (Lams crassirostris) incubated and its effects on hatching interval within two-egg clutches. Incubation patterns were classified into three categories (rising, steady, or pulsed) related to daily change of incubation rate until clutch completion. Hatching intervals (mean +/- SD, 0.95 +/- 0.76 days) were significantly shorter than laying intervals (2.56 +/- 0.75 days). There was a significant positive relationship kbetween incubation rate on the day when the first egg was laid (day 1) and hatching interval (Spearman's r(s) = 0.677, P = 0.016). The incubation rate on day 1 also increased (Spearman's r(s) = 0.521, P = 0.039) as the breeding season progressed, and hatching interval expanded (Kruskal-Wallis test: chi(2)(2) = 8.3, P = 0.016, range = 0-2 day). Thus, the amount of time gulls spent incubating on day 1 was important in affecting hatching intervals and suggested that parents partially controlled hatching intervals with seasonal change by timing of the onset of incubation in this species. Received 27 November 2011. Accepted 30 September 2012.
  • HIROWATARI Toshiya, MATSUI Shin, TAKAGI Masaoki, NASU Yoshitsugu, UEDA Keisuke
    Cho to Ga 63 (3) 107 - 115 0024-0974 2012/09/30 [Refereed][Not invited]
     
    Lepidoptera emerged from nests of the Bull-headed Shrike, Lanius bucephalus Temminck and Schlegel, in Minamidaitojima, Japan was investigated. A total of 56 individuals belonging to six species, Heleanna fukugi Nasu (Tortricidae), Opogona sacchari (Bojer)(Tineidae), Erechthias minuscula (Walsingham) (Tineidae), Anatrachyntis sp. (Cosmopterigidae), Ascalenia sp. (Cosmopterigidae), and Simplicia mistacalis (Guenee) (Noctuidae), were identified. One species H. fukugi, and possibly Ascalenia sp., were considered to utilize the nest as a pupation site, and larvae of the other 4 species were inferred to feed on dead plant material of the nests. Emergence from a bird nest is firstly reported in Simplicia mistacalis and Erechthias minuscula, and the latter species is recorded from Japan for the first time. Species composition of emerged moths differed from previously reported ones, which is characterized by a lack of keratinophagous and chitinophagous tineid moths such as Monopis and Niditinea species.
  • Shin Matsui, Masaoki Takagi
    IBIS 154 (3) 621 - 625 0019-1019 2012/07 [Refereed][Not invited]
     
    Appropriate nest-site selection is one of the most important ways to minimize loss of reproductive investment due to predation. We determined the environmental characteristics associated with nest predation during the incubation and nestling periods of arboreal nesting Bull-headed Shrikes on the oceanic Minami-Daito Island where the predator community has low species diversity and includes only three introduced mammals: Ship Rat Rattus rattus, Japanese Weasel Mustela itatsi and Feral Cat Felis catus. Egg predation declined with increasing grassland cover around nests, whereas nestling predation declined with increasing nest concealment and nest height. Our results suggest that effective nest-site characteristics for avoiding nest predation differ during the incubation and nestling periods and are dependent on the predator species and their search strategies, at least in habitats with low predator species diversity.
  • Sayaka Horie, Masaoki Takagi
    IBIS 154 (2) 285 - 295 0019-1019 2012/04 [Refereed][Not invited]
     
    Age-related improvement in reproductive success is widely observed in birds, and the mechanisms by which productivity is enhanced have received considerable attention. However, little is known about how parental age affects the loss of eggs or nestlings despite the fact that age effects on nesting success are often reported. We examined parental age effects on reproductive success in relation to the avoidance of nest predation in an island subspecies of the Japanese White-eye, the Daito White-eye Zosterops japonicus daitoensis. Clutch size and annual number of breeding attempts did not differ between parental age classes. Reproductive success was affected only by male age through an increase in nesting success. Nest failure was attributed only to predation in this species and nest concealment and nest height were important nest characteristics promoting successful fledging. Older males built their nests in more concealed and higher positions than first-year birds, regardless of vegetation status around the nest. Analysis of individual birds suggested that by shifting the nest to a safer position, male White-eyes achieved higher nesting success than in the previous year. Of three hypotheses of age-related improvement in reproductive success considered, our data favoured the hypothesis that as individuals grow older, their breeding competence improves.
  • Matsui Shin, Tsuchiya Yuko, Takagi Masaoki, Hisaka Mariko
    Journal of Yamashina Institute for Ornithology 44 (1) 31 - 35 1348-5032 2012 [Refereed][Not invited]
  • Masaoki Takagi, Kana Akatani
    ORNITHOLOGICAL SCIENCE 10 (2) 151 - 156 1347-0558 2011/12 [Refereed][Not invited]
     
    We identified the diet of owlets of the Daito subspecies of the Ryukyu Scops Owl Otus elegans interpositus on Minami-daito Island during late May and early June 2009, by means of high-resolution color photography. Cockroaches were provided by parents to their young at all eight nests studied, and contributed the largest single component of the diet (33%). Orthoptera species, which inhabited open grassland habitats, constituted >20% of the total occurrences in the diet of owlets. It is suggested that Ryukyu Scops Owls depend heavily on food items obtained from habitats that have been modified by human activity on Minami-daito Island. Diets for owlets differed widely among nests, and the differences were considered to result from individual differences among parents and/or the environments surrounding each nest.
  • Kana Akatani, Taro Matsuo, Masaoki Takagi
    JOURNAL OF RAPTOR RESEARCH 45 (4) 315 - 323 0892-1016 2011/12 [Refereed][Not invited]
     
    We studied the nest sites, diet, and habitat use of the endemic population of the Daito Scops Owl (Otus elegans interpositus), a subspecies of the Elegant Scops Owl (O. elegans), on a small oceanic island, Minami-daito, in the northwestern Pacific Ocean. We also investigated the relationships between habitat characteristics and breeding performance in the fragmented and developed habitats on the island. Most owls used nest cavities in introduced casuarina (Casuarina spp.) trees (n = 30), whereas a few owls used vertical hollows in broken native fan palm (Livistona chinensis; n = 2) as their nest sites. Owls fed on prey inhabiting both forests and open areas, including spiders (Heteropoda), cockroaches (Blattodea), grasshoppers (Orthoptera) and geckos (Gekkonidae). We tracked 17 territorial males and seven females using radiotelemetry in 2002-07. More than half of the owls selected Fins forests during the breeding season. During the nonbreeding season, most owls selected edges between forests and open areas such as grass-lands and sugar cane fields. Owls with more edge habitat within their home ranges laid eggs earlier (n = 88 breeding attempts) than those with smaller amounts of edge. Daito Scops Owls exhibited behavioral flexibility in their use of human-altered habitats on Minami-daito Island, which may have contributed to their avoidance of extinction.
  • Masaoki Takagi
    IBIS 153 (4) 779 - 788 0019-1019 2011/10 [Refereed][Not invited]
     
    The distribution of species and species diversity can be affected by vicariance or dispersal. To understand their role in shaping species distribution and population structure these two processes must be estimated within and among populations. I analysed large-scale variation in the call structure of the Ryukyu Scops Owl Otus elegans. This owl is distributed over a 1200-km range, and only inhabits islands. Within this range, I studied this species across 22 continental islands of the Ryukyu Archipelago and two oceanic islands. The study aimed to assess whether there is variation in the acoustic structure of Owl hoot calls within islands, among major groups of islands and across a large area comprising a major biogeographical barrier (the Kerama Gap). The acoustic structure of calls was homogeneous within islands and among major island-groups. Acoustic differentiation, however, increased over longer geographical distances of up to about 1200 km. The acoustic structure of hoots of the Ryukyu Scops Owl populations was clearly divided into two groups, north and south of the Kerama Gap. It is suggested that the Kerama Gap acted as a biogeographical barrier and contributed to the differentiation between the two major island-groups. It is likely that this difference developed during the fragmentation of a widespread ancestral population by vicariant isolating events. There was also evidence of an effect of dispersal on vocal differentiation in subspecies inhabiting the two oceanic islands.
  • Naoki Tomita, Kentaro Kazama, Hidetsugu Sakai, Megumi Sato, Atsushi Saito, Masaoki Takagi, Yasuaki Niizuma
    ORNITHOLOGICAL SCIENCE 10 (1) 21 - 25 1347-0558 2011/06 [Refereed][Not invited]
     
    Mother birds can enhance growth and/or survival of chicks by supplying energetic and hormonal resources to the egg yolk (i.e. maternal effect). In several bird species, mothers supply higher level of testosterone to the eggs laid later within the clutch and enhance the growth of the chick to compensate for the disadvantage of the later hatching. As same as this within-clutch mechanism, mothers breeding later in the season can be expected to supply higher level of testosterone to the clutch. However, among-clutch seasonal variation in yolk testosterone levels has been rarely described. Here, we investigated among-clutch seasonal variation in the yolk testosterone level in Black-tailed Gulls Larus crassirostris, as well as within-clutch variation. Mean yolk testosterone level of eggs laid later within the clutch ("b-eggs") was significantly higher than that of eggs laid earlier ("a-eggs"). The yolk testosterone levels of both a- and b-eggs of later breeders were significantly higher than those of earlier ones, while this trend was not observed in mean egg mass. Our results indicate that mothers establishing the clutch later in the season would invest more maternal testosterone into the clutch.
  • Matsui Shin, Kobayashi Sayaka, Takagi Masaoki
    Jpn. J. Ornithol. 60 (2) 262 - 265 0913-400X 2011 [Refereed][Not invited]
  • Shin Matsui, Mariko Hisaka, Masaoki Takagi
    BIRD CONSERVATION INTERNATIONAL 20 (1) 34 - 42 0959-2709 2010/03 [Refereed][Not invited]
     
    The introduction of exotic rats Ratios spp. is one of the most important factors contributing to the reduction in avian diversity and extinctions on oceanic islands. However, little is known about factors other than predation, which are associated with the loss of island biodiversity. We report that introduced Ship Rats Ratios ratios constructed arboreal dome-shaped nests and secondarily used open-cup nests of the Bull-headed Shrike Lanius bucephalus for roosting or rearing young in trees within hedgerows along sugarcane fields of Minami-daito Island (northwest Pacific). We found that temporal nest utilization by Ship Rats forced Bull-headed Shrikes to abandon their nests before egg-laying. We suggest that kleptoparasitism applies to the interaction between Bull-headed Shrikes and Ship Rats, which usurp shrike nests during their breeding period. It is necessary to consider the potential effects of introduced Ship Rats on insular avian communities not only through predation but also through interspecific interaction over nest-sites.
  • Mao Nakamura, Yoshihide Takaki, Sayaka Mori, Keisuke Ueda, Isao Nishiumi, Masaoki Takagi, Richard A. Noske, Kazuhiro Eguchi
    Journal of the Yamashina Institute for Ornithology 42 (1) 47 - 64 1882-0999 2010 [Refereed][Not invited]
     
    We conducted a study to clarify the impact of bush fires on the structure of non-breeding flocks of the Red-backed Fairy-wren Malurus melanocephalus cruentatus in the Australian monsoon tropics. Overall, the mean group size was large in the mid dry season, becoming smaller with the progress of season. Large groups occurred at burnt sites, while at unburnt sites group size was smaller owing to a higher proportion of pair-sized groups. Bush fire destroyed habitat and forced resident birds to emigrate. Conversely, unburnt sites were used as a refuge during fires. However, in the non-breeding season, such stable habitats were occupied by stable and small-sized groups and were already saturated. Therefore, individuals that immigrated into these habitats during fires were forced to emigrate again. After a fire, many birds invaded burnt sites from the surrounding area and aggregated in large but unstable flocks that consequently diminished due to the individual separation of young males just before the breeding season. Bush fires resulted in the reorganisation of groups and re-establishment of territory. © Yamashina Institute for Ornithology.
  • Naoki Tomita, Sayaka Someya, Isao Nishiumi, Osamu Hasegawa, Yukiko Inoue, Masaoki Takagi
    Journal of the Yamashina Institute for Ornithology 42 (1) 79 - 90 1882-0999 2010 [Refereed][Not invited]
     
    We reported characteristics of external morphology and DNA sequence from the carcass of a large-sized gull with yellow legs recovered at Teuri Island, Hokkaido, Japan. According to Olsen & Larsson (2003), based on the tone of the upperwings and mantle and the pattern of the primary tips the carcass sample was identified as Larus heuglini, but could not be identified at the subspecies level. Sequence variation in the cytochrome b and control region gene of the carcass sample agreed with common types of closely-related taxa (fuscus, heuglini, barabensis, or taimyrensis). Our study underscored the diffculty in identifying large white-headed gulls accurately even when based on quantitative data such as those obtained from carcass samples or DNA sequences. Further quantitative studies on inter- and intra-population variations in external morphology of birds at each breeding site are needed. © Yamashina Institute for Ornithology.
  • Yoshio Tsuda, Shin Matsui, Atsushi Saito, Kana Akatani, Yukita Sato, Masaoki Takagi, Koichi Murata
    JOURNAL OF THE AMERICAN MOSQUITO CONTROL ASSOCIATION 25 (3) 279 - 284 8756-971X 2009/09 [Refereed][Not invited]
     
    The seasonal prevalence and spatial distribution of mosquitoes were examined as part of an avian malaria study on the oceanic island of Minami-Daito Island, Japan. Because dry ice was not available in this study, yeast-generated CO(2) was used to attract biting mosquitoes. Adult mosquitoes were collected biweekly using battery-operated traps enhanced with yeast-generated CO, and a gravid trap from March 2006 to February 2007. The CO-baited traps were distributed in 4 different habitats: sugar cane field, forest and vegetation ring, residential area, and swamp area. At 3 collection sites beside sugar cane fields, traps were fixed at 2 different heights (3 and 6 in above the ground). A total of 1,437 mosquitoes of the following 9 species were collected: Culex quinquefasciatus, Aedes albopictus, Coquillettidia sp., Mansonia uniformis, Culex rubithoracis, Armigeres subalbatus, Lutzia fuscanus, Aedes daitensis, and Aedes togoi. Among them, Cx. quinquefasciatus, Ae. albopictus, and Coquillettidia sp. were dominant. The high density and wide distribution of Cx. quinquefasciatus throughout the island Suggested the importance or this species as a principal vector of avian malaria on the island.
  • Naoki Tomita, Yasuaki Niizuma, Masaoki Takagi, Motohiro Ito, Yutaka Watanuki
    ECOLOGICAL RESEARCH 24 (1) 157 - 162 0912-3814 2009/01 [Refereed][Not invited]
     
    Sea-surface temperature (SST) directly and indirectly affects the distribution and abundance of prey species for seabirds, so we expect variation in SST to be associated with variation in seabird life history traits. In black-tailed gulls (Larus crassirostris) at Teuri Island in northern Hokkaido, Japan, we investigated the diet of the gulls prior to egg laying in 2004 and 2005, and examined the influences of SST in March or April, when the gulls congregate in the colony, on egg-laying parameters using 13 years of data (1992-2004). The gulls fed on krill (Thysanoessa inermis) and fish prior to the egg laying. Mean first egg dates and clutch sizes were significantly and quadratically related to SST anomalies in March, but were not influenced by SST anomalies in April. There was no significant effect of SSTs in either March or April on egg volume. Sea-surface temperature anomalies in March of the years of early laying (-1 to 1A degrees C) were higher than those in 2001 (-2.2A degrees C), but lower than those in 1992 (+1.2A degrees C) and 2004 (+1.1A degrees C). Thysanoessa inermis congregates to spawn at the sea surface, when SSTs rise 3-4A degrees C. Thus, a mismatch between food availability and the timing of egg production in the gulls could have occurred in these 3 years. This study suggests that SST fluctuations prior to laying are important in breeding success of black-tailed gulls.
  • Shin Matsui, Kana Akatani, Sayaka Horie, Masaoki Takagi, Tomonori Kikuchi
    Ornithological Science 8 (1) 81 - 86 1347-0558 2009 [Refereed][Not invited]
     
    This report describes, for the first time, harmful effects of invasive Yellow Crazy Ants Anoplolepis gracilipes on wild birds in Japan. We observed fledglings of Bull-headed Shrike Lanius bucephalus and Daito White-eye Zosterops japonicus daitoensis caused fatal injuries by ants on the ground on Minami-daito Island. We compared reproductive behaviors of Daito Scops Owl Otus elegans interpositus in a cavity with ants and cavities without ants and found that while reproductive success did not differ between them, parental females in a cavity with ants more frequently interchanged their nest site than those in cavities without ants. © 2009, The Ornithological Society of Japan. All rights reserved.
  • Takagi Masaoki
    Jpn. J. Ornithol. 58 (1) 1 - 17 0913-400X 2009 [Refereed][Not invited]
  • Hiroko Ejiri, Yukita Sato, Emi Sasaki, Daisuke Sumiyama, Yoshio Tsuda, Kyoko Sawabe, Shin Matsui, Sayaka Horie, Kana Akatani, Masaoki Takagi, Sumie Omori, Koichi Murata, Masayoshi Yukawa
    JOURNAL OF VETERINARY MEDICAL SCIENCE 70 (11) 1205 - 1210 0916-7250 2008/11 [Refereed][Not invited]
     
    Several species of birds in Minami Daito Island, an oceanic island located in the far south from the main islands of Japan, were found to be infected with avian Plasmodium. However, no vector species of the avian malaria in this island have been revealed yet. To Speculate potential vectors, we collected mosquitoes there and investigated using a PCR procedure whether the mosquitoes harbor avian malaria or not. Totally 1,264 mosquitoes including 9 species were collected during March 2006 to February 2007. The mosquitoes collected were stored every species, sampled date and location for DNA extraction. Fifteen Out of 399 DNA samples showed positive for the partial mtDNA cytb gene of avian Plasmodium. Estimated minimum infection rate among collected mosquitoes was 1.2% in this study. Four species of mosquitoes; Aedes albopictus, Culex quinquefasciatus, Liatzia fuscanus and Mansonia sp. had avian Plasmodium gene sequences. Detected DNA sequences from A. albopictus and L. fuscanus were identical to an avian Plasmodium lineage detected ill bull-headed shrike (Lanius bucephalus) captured in the island. Different sequences were detected from C. quinquefasciatus, which were corresponding to all avian Plasmodium from a sparrow (Passer montanus) and Plasmodium gallinaceum. Our results suggest that A. albopictus, Lutzia fuscanus, C. quinquefasciatus, and Mansonia sp. Could be potential vectors of avian malaria in Minami Daito Island. This study was the first report of molecular detection of avian Plasmodium from mosquitoes in Japan.
  • Koichi Murata, Ryosuke Nii, Saori Yui, Emi Sasaki, Satoshi Ishikawa, Yukita Sato, Shin Matsui, Sayaka Horie, Kana Akatani, Masaoki Takagi, Kyoko Sawabe, Yoshio Tsuda
    JOURNAL OF VETERINARY MEDICAL SCIENCE 70 (5) 501 - 503 0916-7250 2008/05 [Refereed][Not invited]
     
    Haemosporidian parasites infection among wild birds inhabiting Minami-daito Island was studied. Blood films from 183 birds representing 4 species of 4 families were examined microscopically. Avian haemosporidian parasites were detected in 3 species with an overall prevalence of 59.6%. None of the 30 Daito scops owls (Otus scops interpositus) examined were infected. Either Haemoproteus sp. or Plasmodium sp. infection was found in 14 of 31 (45.2%) Borodino islands white-eyes (Zosterops japonicus daitoensis). Plasmodium Sop. were found in 94 of 102 (92.2%) bull-headed shrikes (Lanius bucephalus) and 1 of 20 (5%) tree sparrows (Passer montanus).
  • 南大東島で採集された蚊における鳥マラリア原虫遺伝子の検出
    江尻寛子, 佐藤雪太, 佐々木絵美, 仁位亮介, 津田良夫, 松井 晋, 高木昌興, 湯川眞嘉, 村田浩一
    日本獣医寄生虫学会誌 6 (1) 38  2008/02 [Refereed][Not invited]
  • Responses in breeding behaviour of Black-tailed Gull Larus crassirostris to different marine environments.
    KAZAMA Kentaro, TOMITA Naoki, Ito Motohiro, NIIZUMA Yasuaki, TAKAGI Masaoki, WATANUKI Yutaka
    Proceeding of International Symposium on the Origin and Evolution of Natural Diversity 215 - 220 2008 [Refereed][Not invited]
  • 南大東島における鳥マラリア原虫の分子系統と宿主転換
    炭山大輔, 佐々木絵美, 佐藤雪太, 津田良夫, 澤邊京子, 松井 晋, 堀江明香, 高木昌興, 猪子英俊, 村田浩一
    日本獣医寄生虫学会誌 7 (1) 23  2008 [Refereed][Not invited]
  • Kazuhiro Eguchi, Noriyuki Yamaguchi, Keisuke Ueda, Hisashi Nagata, Masaoki Takagi, Richard Noske
    JOURNAL OF ORNITHOLOGY 148 S203 - S210 0021-8375 2007/12 [Refereed][Not invited]
     
    A 4-year study of cooperative breeding in the Grey-crowned Babbler Pomatostomus temporalis was conducted in the monsoon-tropics of northern Australia. Most groups comprised a single socially monogamous pair with up to seven helpers. We found no floaters. The sex ratio was almost unity for each year. Helpers included philopatric offspring, immigrating juveniles and immigrating sexually mature birds. Adults of both sexes moved frequently between groups. Pairs without helpers were unable to raise young to fledging and often divorced, suggesting that cooperative breeding was obligatory in this population. However, for groups with helpers, the group size effect was weak; there was no significant correlation between the number of fledglings and number of helpers. Breeding females exclusively contributed to incubation. Breeders contributed more to provisioning of nestlings than non-breeders. Although helpers did not enhance the total provisioning rate to nestlings, small groups should recruit helpers to maintain the group and enhance reproductive success.
  • TAKAGI Masaoki, AKATANI Kana, SAITO Atsushi, MATSUI Shin
    Ornithological Science 6 (1) 39 - 42 1347-0558 2007/07 [Refereed][Not invited]
  • MATSUI Shin, IKEDA Hiroshi, NARUSE Tohru, ASANUMA Kiyoshi, TAKAGI Masaoki
    The Biological magazine,Okinawa 沖縄生物学会 45 33 - 37 0474-0394 2007/05/31 [Refereed][Not invited]
  • Masaoki Takagi, Kana Akatanti, Shin Matsui, Atsushi Saito
    JOURNAL OF RAPTOR RESEARCH 41 (1) 52 - 56 0892-1016 2007/03 [Refereed][Not invited]
  • YAMADA Fumihiko, TAKAGI Masaoki
    Japanese journal of ornithology 55 (2) 114 - 116 0913-400X 2006/12/22 [Refereed][Not invited]
  • MATSUI Shin, TAKAGI Masaoki, UEDA Keisuke
    Jpn. J. Ornithol. 55 (1) 29 - 31 0913-400X 2006/06/22 [Refereed][Not invited]
  • モズ(Lanius bucephalus)おけるHamatospiculum属線虫(Diplotriaenoidea上科)の濃厚寄生症例報告とその保全医学上の視点
    大沼 学, 吉野智生, 高木昌興, 松井 晋, 長嶺 隆, 川嶋貴治, 村田浩一, 桑名 貴, 浅川満彦
    日本獣医寄生虫学会誌 5 (1) 50  2006/02 [Refereed][Not invited]
  • Matsui Shin, Hisaka Mariko, Takagi Masaoki
    Ornithological Science 5 227 - 229 2006 [Refereed][Not invited]
  • Y Niizuma, M Takagi, M Senda, M Chochi, Y Watanuki
    JOURNAL OF AVIAN BIOLOGY 36 (5) 421 - 427 0908-8857 2005/09 [Refereed][Not invited]
     
    Factors determining clutch size of birds have long been the central issue in studies in life histories. It is assumed that the configuration of brood patches could limit the maximum clutch size. To test this hypothesis we manipulated clutch sizes and measured egg temperature as well as reproductive consequences in black-tailed gulls Larus crassirostris, which usually lay two egg clutches and have three brood patches. Mean egg temperature in 4-egg clutches (32.6 +/- 1.0 degrees C) was significantly lower than in 2-egg (34.6 +/- 0.4 degrees C) and 3-egg clutches (34.1 +/- 0.4 degrees C), because egg temperature of the coolest egg within a 4-egg clutch was often substantially lower than the other three eggs. The proportion of eggs hatching from 4-egg clutches (11.6%) was lower than those of 2-egg (49.1%) and 3-egg clutches (52.0%). Four-egg clutches had longer incubation periods (29.6 +/- 1.3 day) than 2-egg (28.1 +/- 1.7 day) and 3-egg clutches (28.0 +/- 1.3 day). The results indicate that incubation capacity, which may be determined by the configuration of brood patches, limits the maximum clutch size in black tailed gulls, but not the actual clutch size typically laid.
  • HORIE Sayaka, MATSUI Shin, TAKAGI Masaoki
    Jpn. J. Ornithol. 54 (1) 58 - 59 0913-400X 2005/07/29 [Refereed][Not invited]
  • The timing of clutch initiation in Bull-headed Shrikes (Lanius bucephalus) in relation to re-nesting or second nesting._
    TAKAGI Masaoki
    Ornis Fennica 81: 84-90. 81 84 - 90 2004 [Refereed][Not invited]
  • M Takagi
    ORNIS FENNICA 81 (2) 84 - 90 0030-5685 2004 [Not refereed][Not invited]
     
    The date of initiation of reproduction was studied in Bull-headed Shrikes (Lanius bucephalus) to test whether this date allows time for re-nesting and successfully laying a second clutch, and whether nest predation influences chances of re-nesting. The study was conducted during the breeding season (April-July) from 1994 to 1996 in northern Japan. Only breeders that started laying eggs in April or in early May bred twice in one season. However, not all pairs with a first nest within this period necessarily breed twice. Of the 39 pairs that bred successfully in the first breeding attempt, only four pairs (10%) initiated a second nesting attempt. The timing of laying eggs in the first nesting attempt is a necessary, but not sufficient condition for the second nesting attempt. The probability of re-nesting after nest predation decreased at 3% day(-1) as the date of clutch initiation progressed. Predation during the nestling stage reduces the probability of re-nesting much more than predation during egg-laying or incubation. It is likely that the degree of investment in the first nest determines whether or not shrikes re-nest after nest failure. To ensure the chance to re-nest after failure in the first nesting attempt, Bull-headed Shrikes need to start laying as early as possible.
  • M Takagi
    CANADIAN JOURNAL OF ZOOLOGY-REVUE CANADIENNE DE ZOOLOGIE 81 (2) 287 - 293 0008-4301 2003/02 [Refereed][Not invited]
     
    I studied the seasonal change in egg volume in Bull-headed Shrikes, Lanius bucephalus, to explore the importance of egg-volume variation within a clutch. The mean egg volume did not change over a season; however, the coefficient of variation in egg volume in six-egg clutches significantly increased in 1994 and 1995 but did not change in 1996. Peaks in arthropod biomass occurred early in the breeding seasons in 1994 and 1995, but late in the season in 1996. Higher food availability was related to a reduction in variation in egg volume within a clutch. A significant difference in egg volume was found within six-egg clutches, and the first egg was the smallest. Nestlings that hatched from small eggs early in the hatching order suffered lower mortality rates than nestlings that hatched from large eggs laid late in the hatching order. The duration of time between settlement of a female in a male territory and clutch initiation decreased with date. Intraclutch variation in egg volume may be caused by a trade-off between the time to develop an egg and the volume of the first egg within a clutch. Because eggs that hatch first do not need to be large for the hatchling to survive, the Bull-headed Shrikes may advance the clutch-initiation date at the cost of reducing the volume of the first egg.
  • M Takagi
    JOURNAL OF ETHOLOGY 21 (1) 9 - 14 0289-0771 2003 [Refereed][Not invited]
     
    The difference in the reproductive performance of males and females of the Bull-headed Shrike (Lanius bucephalus) according to age class, i.e. yearling and adult, was studied, and the age-related difference was examined according to parental feeding behavior. The clutch initiation date was not affected by the age class. Females that paired with an adult male laid more eggs per clutch than those paired with a yearling male. The age class of males affected the mass of nestlings at 6 days old, and the age class of females affected the mass of nestlings at 12 days old. The effects of the age of either parent independently were observed at different breeding stages. A change in the degree of nestling feeding peformed by the male and female parents occurred at some point between when the broods were 6 days and 12 days old. It is likely that this caused an effect of age at different stages of the breeding cycle. The effects of the age of the male parent are consistent with accounts of age-related reproduction in raptors where males provide resources to offspring. Individual improvements in foraging skills and/or courtship feeding rate are suggested to be possible explanations.
  • Masaoki Takagi
    Journal of Field Ornithology 74 (1) 45 - 52 0273-8570 2003 [Refereed][Not invited]
     
    Philopatry and habitat selection were examined for migratory populations of the two sympatric shrike species, the Bull-headed (Lanius bucephalus) and Brown (L. cristatus) shrikes in northern Japan between 1992 and 1997. Although 18% of banded Bull-headed Shrike males returned to the previous breeding area, no female did. In Brown Shrikes, 43% and 13% of banded males and females, respectively, returned to the area. Brown Shrikes are significantly more philopatric than Bull-headed Shrikes. Even successful breeders in Bull-headed Shrikes did not always return to the area near their nesting site of the previous year. Successful breeders in Brown Shrikes were faithful to their past breeding site. Brown Shrikes decreased by 67% due to habitat loss over four years, while the population of Bull-headed Shrikes was stable. The degree of philopatry was inconsistent with the population trends of the two shrikes. While Bull-headed Shrikes did not have habitat preferences in the study area, Brown Shrikes bred mainly in natural grasslands with shrubs. Since available habitat for Brown Shrikes has decreased rapidly in and near the study area, the philopatry of Brown Shrikes may result from a scarcity of habitat that inhibits dispersal. Bull-headed Shrikes may have a higher tendency to disperse because they are habitat generalists. With its more narrow requirements, the Brown Shrike appears to have suffered significantly from habitat loss, while the Bull-headed Shrike has not been adversely affected.
  • M Takagi
    ECOLOGICAL RESEARCH 17 (6) 617 - 624 0912-3814 2002/11 [Refereed][Not invited]
     
    I investigated seasonal changes in the relationships between brood size, body mass of nestlings and body mass of parents of the bull-headed shrike, Lanius bucephalus , in Ishikari, northern Japan. When the broods were 12 days old, the body mass of the heaviest nestling in a brood did not differ among brood sizes, or throughout the season. However, the body mass of the lightest nestlings in a brood was different among brood sizes. The body mass of the lightest nestling in five- and six-nestling broods decreased throughout the season. The lightest nestling in four-nestling broods, and the lightest and the second lightest nestlings in five-nestling broods, were significantly lighter than the heaviest nestling in broods of this size. It is likely that pairs with six nestlings at 12 days old can feed at least five of these nestlings enough to ensure their survival . The standardized body mass of parents (SBM), which was defined as the body mass divided by the length of the tarsus, did not differ among brood sizes, or throughout the season. It is possible that the relationship between the constancy of the SBM and the seasonal decline in the body mass of nestlings indicates that bull-headed shrikes have a limit to their parental efforts.
  • Takagi Masaoki
    Journal of the Yamashina Institute for Ornithology 34 (1) 30 - 38 0044-0183 2002 [Refereed][Not invited]
  • Sexual differences in the external measurements of Black-tailed Gulls breeding on Rishiri Island, Japan._
    CHOCHI Michiyo, NIIZUMAYasuaki, TAKAGI Masaoki
    Ornithological Science 1 163 - 166 2002 [Refereed][Not invited]
  • Hatching pattern and egg volume variation within a clutch in relation to sibling competition.
    TAKAGI Masaoki
    Proceedings of the Japan society for comparative endocrinology_ 17 4 - 5 2002 [Refereed][Not invited]
  • Masaoki Takagi
    J. Yamashina Inst. Ornithol. 32 (1) 13 - 23 2000/05/31 [Refereed][Not invited]
  • TAKAGI Masaoki, Higuchi Hiroyoshi
    Japanese Journal of Ornithology 49 113 - 117 2000 [Refereed][Not invited]
  • M Takagi
    IBIS 141 (1) 140 - 141 0019-1019 1999/01 [Refereed][Not invited]
  • 嵩原 建二, 姉崎 悟, 高木 昌興
    沖縄県立博物館紀要 (25) 75 - 93 1999 [Refereed][Not invited]
  • TAKAGI Masaoki
    Jpn. J. Ornithol. 48 (1) 61 - 81 0913-400X 1999 [Refereed][Not invited]
  • TAKAGI Masaoki, UEDA Masako
    Japanese Journal of Ornithology 46 (3) 175 - 176 0913-400X 1998/02 [Refereed][Not invited]
  • Takagi Masaoki, Takahashi Mitsuhiko
    Strix 15 127 - 129 1997 [Refereed][Not invited]
  • TAKAGI Masaoki, ABE Shiori
    Japanese journal of ornithology 45 (3) 167 - 174 0913-400X 1996/12 [Refereed][Not invited]
  • Takagi Masaoki, ABE Shiori
    Journal of the Yamashina Institute for Ornithology 28 (2) 103 - 105 1996/10 [Refereed][Not invited]
  • TAKAGI Masaoki
    Japanese Journal of Ornithology 45 (3) 187 - 190 0913-400X 1996 [Refereed][Not invited]
  • M Takagi, M Ueta, S Ikeda
    JOURNAL OF RAPTOR RESEARCH 29 (4) 267 - 269 0892-1016 1995/12 [Refereed][Not invited]
  • Comparative studies on nest sites and diet of Lanius bucephalus and L. cristatus in northern Japan.
    TAKAGI Masaoki, Ogawa Iwao
    Proceedings of the Western Foundation of Vertebrate Zoology 6 200 - 2003 1995 [Refereed][Not invited]
  • 伊豆諸島三宅島におけるアカコッコ Turdus celaenops の環境選好とイタチ放獣の影響
    高木昌興, 樋口広芳, 伊豆諸島三宅島におけるアカコッコ, Turdus celaenops, の環境選好とイタチ放獣の影響, Strix
    Strix 11 47 - 57 1992 [Refereed][Not invited]

Books etc

Conference Activities & Talks

MISC

  • 沖縄県池間島におけるアカノドカルガモAnas luzonicaの観察記録
    植村慎吾, 仲地邦博, 浜地歩, 高木昌興  日本鳥学会誌 = Japanese journal of ornithology  68-  (2)  2019  [Refereed][Not invited]
  • 絶滅した自然集団のDNAから生物が新しい集団形成を可能にする条件を探る
    青木大輔, 松井晋, 永田純子, 千田万里子, 野間野史明, 髙木昌興  2018年日本鳥学会大会  P080  2018/09  [Not refereed][Not invited]
  • 海洋島に集団が定着できる理由を紐解く―モズの定着成功・失敗個体群の集団遺伝学的比較から―
    青木大輔, 松井 晋, 永田 純子, 千田 万里子, 野間野 史明, 髙木 昌興  第65回 日本生態学会大会  p2-127  2018/03  [Not refereed][Not invited]
  • ダイトウコノハズクの健全な育雛を実現するFRP 製巣箱の改良と繁殖のモニタリング
    永井秀弥, 澤田 明, 澤田純平, 高木昌興  自然保護助成基金成果報告書  27-  2018  [Not refereed][Not invited]
  • 進化的に重要な単位(ESU)である伊平屋・伊是名島のリュウキュウコノハズク個体群の現状把握と基礎生態
    髙木昌興, 齋藤武馬, 植村慎吾, 浜地 歩, 澤田 明  自然保護助成基金成果報告書  26-  33  -40  2018  [Not refereed][Not invited]
  • 絶滅危惧I B 類・天然記念物キンバトの繁殖生態
    田中健太, 大井沙綾子, 櫻井宥昌瑚, 仲地邦博, 岩﨑哲也, 髙木昌興  自然保護助成基金成果報告書  24-  77  -83  2016  [Not refereed][Not invited]
  • Masaoki Takagi  ORNITHOLOGICAL SCIENCE  12-  (1)  1  -1  2013/06  [Not refereed][Invited]
  • 大東諸島の固有生物相を支えるダイトウビロウの保護に関する緊急調査
    伊澤雅子, 佐々木健志, 小林 峻, 傳田哲郎, 高木昌興, 堀江明香, 碓井良太, 後藤健志  プロ・ナトゥーラ・ファンド第22期助成成果報告書  17  -42  2011  [Not refereed][Not invited]
  • 大東島の環境保全のための啓蒙活動
    赤谷加奈, 村上茜, 松尾太郎, 高木昌興  プロ・ナトゥーラ・ファンド第20期助成成果報告書  165  -167  2011  [Not refereed][Not invited]
  • Naoki Tomita, Sayaka Someya, Isao Nishiumi, Osamu Hasegawa, Yukiko Inoue, Masaoki Takagi  Journal of the Yamashina Institute for Ornithology  42-  (1)  79  -90  2010  [Not refereed][Not invited]
     
    We reported characteristics of external morphology and DNA sequence from the carcass of a large-sized gull with yellow legs recovered at Teuri Island, Hokkaido, Japan. According to Olsen & Larsson (2003), based on the tone of the upperwings and mantle and the pattern of the primary tips the carcass sample was identified as Larus heuglini, but could not be identified at the subspecies level. Sequence variation in the cytochrome b and control region gene of the carcass sample agreed with common types of closely-related taxa (fuscus, heuglini, barabensis, or taimyrensis). Our study underscored the diffculty in identifying large white-headed gulls accurately even when based on quantitative data such as those obtained from carcass samples or DNA sequences. Further quantitative studies on inter- and intra-population variations in external morphology of birds at each breeding site are needed. © Yamashina Institute for Ornithology.
  • モズの早贄の謎
    高木昌興  私たちの自然  50-  14  -15  2009  [Not refereed][Not invited]
  • 南大東島に隔離分布するダイトウコノハズクの鳴き声を用いた個体識別となわばり個体の入れ替わり._
    高木昌興, 赤谷加奈, 松井晋  プロ・ナトゥーラ・ファンド第16期助成成果報告書  161  -169  2008  [Not refereed][Not invited]
  • モズの特性を観察する
    高木昌興  私たちの自然  49-  8  -10  2008  [Not refereed][Not invited]
  • 江尻寛子, 佐藤雪太, 佐々木絵美, 仁位亮介, 津田良夫, 松井晋, 高木昌興, 湯川眞嘉, 村田浩一  Twig’s  53-  36  2007/09/01  [Not refereed][Not invited]
  • Social structure and helping behavior in the Grey-crowned Babbler
    K. Eguchi, N. Yamaguchi, K. Ueda, M. Takagi, H. Nagata, R. Noske  JOURNAL OF ORNITHOLOGY  147-  (5)  9  -9  2006/08  [Not refereed][Not invited]
  • The influence of interannual variation in sea-surface temperature on the first egg date of Black-tailed Gulls at Teuri Island, Japan
    N. Tomita, M. Takagi, Y. Watanuki  JOURNAL OF ORNITHOLOGY  147-  (5)  264  -264  2006/08  [Not refereed][Not invited]
  • S. Matsui, M. Takagi  JOURNAL OF ORNITHOLOGY  147-  (5)  209  -209  2006/08  [Not refereed][Not invited]
  • 生態図鑑 モズ Lanius bucephalus
    Bird Research News  3-  (6)  4  -6  2006  [Not refereed][Not invited]
  • 南大東島に隔離分布するダイトウコノハズク個体群の保全に関する研究
    高木昌興, 赤谷加奈, 松井晋  プロ・ナトゥーラ・ファンド第14期助成成果報告書  3  -10  2005  [Not refereed][Not invited]
  • モズの子育て戦略
    高木昌興  Birder  19-  (10)  24  -26  2005  [Not refereed][Not invited]
  • 亜熱帯の島に移り住んだモズ
    松井晋, 高木昌興  Birder  19-  (10)  27  -29  2005  [Not refereed][Not invited]
  • 姉崎 悟, 嵩原 建二, 松井 晋  沖縄県立博物館紀要  (29)  25  -54  2003  [Not refereed][Not invited]
  • Change in body mass in relation to breeding phase in bull-headed shrikes
    M Takagi  ECOLOGICAL RESEARCH  17-  (3)  411  -414  2002/05  [Not refereed][Not invited]
     
    Changes in body mass of both sexes of the bull-headed shrike, Lanius bucephalus , were investigated over the six breeding phases of this species. Standardized body mass (SBM), which was defined as body mass divided by the length of the tarsus, of the males was relatively constant over the phrases, while the SBM of the females changed drastically. In the females, the SBM during egg-laying was higher than the SBM in all the other breeding phases. The SBM of the females did not differ between the incubation and early-nestling phases, and was lowest during the fledgling phase. Mass loss in bull-headed shrikes did not correspond to an adaptive adjustment of body mass to permit a reduction in the power required for flight in the nestling period. It is likely that incubating females constantly maintain their body mass to invest in parental efforts from the incubating to nestling periods.
  • 長谷川理, 高木昌興, 綿貫豊, 阿部周一  日本生態学会大会講演要旨集  49th-  281  2002/03/25  [Not refereed][Not invited]
  • 千田麻由, 新妻靖章, 高木昌興, 綿貫豊  日本生態学会大会講演要旨集  49th-  192  2002/03/25  [Not refereed][Not invited]
  • 高木昌興  日本生態学会大会講演要旨集  49th-  115  2002/03/25  [Not refereed][Not invited]
  • 千田麻由, 新妻靖章, 高木昌興, 井関謙一, 綿貫豊  日本生態学会大会講演要旨集  48th-  135  2001/03/22  [Not refereed][Not invited]
  • Some effects of inclement weather conditions on the survival and condition of bull-headed shrike nestlings
    M Takagi  ECOLOGICAL RESEARCH  16-  (1)  55  -63  2001/03  [Not refereed][Not invited]
     
    Inclement weather struck Japan in 1933, permitting a natural experiment for examining the effect of weather conditions on nesting success and nestling growth of the bull-headed shrike, Lanius bucephalus. Aspects of the breeding biology of bull-headed shrikes in relation to weather conditions and timing of breeding in 1992 and 1993 were examined. The two breeding seasons were divided into two periods, early and late, in each year. While the probability of nest survival in nestling stages during both periods was almost equal, the probability of nest survival in the egg stage during the early period was significantly lower than that during the late period. In 1993, the probability of nestling survival during the late period was significantly lower than during the early period; the late period had larger fluctuations of precipitation and was colder than the same period in 1992. The number of 'disappeared' nestlings positively correlated with mean precipitation per day. The greater part of the disappeared nestlings was the lightest in each brood. Late breeders fledged lighter young than the early breeders. Although shrikes adopted hatching asynchrony, the late breeders could not surmount the unpredictable inclement weather in 1993.
  • 高木昌興, 陳有, 長谷川理, 帖地美千代, 綿貫豊  日本生態学会大会講演要旨集  47th-  199  2000/03/21  [Not refereed][Not invited]
  • Masaoki TAKAGI, Hiroyoshi HIGUCHI  Jpn. J. Ornithol.  49-  (3)  113  -117  2000  [Not refereed][Not invited]
  • 高木昌興, 永田純子, 上田雅子  日本生態学会大会講演要旨集  46th-  176  1999/03/22  [Not refereed][Not invited]
  • Some avian morphological traits : ageirelated morphological difference of the Bull-headed Shrike Lanius bucephalus
    IBIS  141-  (1)  140  -141  1999  [Not refereed][Not invited]
  • Inbreeding in Wild Arian Population
    Japanese Journal of Ornithology  48-  (1)  61  -81  1999  [Not refereed][Not invited]
  • 高木昌興  日本生態学会大会講演要旨集  45th-  16  1998/03  [Not refereed][Not invited]
  • 書評『鳥はどこで眠るのか』アレクサンダー・E・スカッチ著. 浜口哲一・高橋満彦訳
    高木昌興  生物科学  50-  192  1998  [Not refereed][Not invited]
  • 高木昌興  日本生態学会大会講演要旨集  44th-  79  1997/03  [Not refereed][Not invited]
  • Masaoki Takagi  Journal of Yamashina Institute Ornithology  28-  (2)  103  -105  1996  [Not refereed][Not invited]
  • Sexual size dimorphism and sex determination of a Brown Shrikesbspecies, Lanius cristatus supercilious
    Jpn. J. Ornithol.  45-  (3)  187  -190  1996  [Not refereed][Not invited]
  • Seasonal Changes of nest site and nest success in Bull-headed Shrikes
    Japanese Journal of Ornithology  45-  (3)  167  -174  1996  [Not refereed][Not invited]
  • Accipiters prey on nestling birds in Japan
    M Takagi, M Ueta, S Ikeda  JOURNAL OF RAPTOR RESEARCH  29-  (4)  267  -269  1995/12  [Not refereed][Not invited]
  • Comparative studies on nest sites and diet of Lanius bucephalus and L. cristatus in northern Japan
    Proceedings of the Western Fondation Vertebrate Zoology  6-  (1)  200  -203  1995  [Not refereed][Not invited]
  • 繁殖期のモズのなわばり行動
    高木昌興  Birder  8-  (9)  24  -27  1994  [Not refereed][Not invited]
  • Habitat preference of the Izu Islands Thrush Turdus celaenops and the effect of weasel introduction on the population of the thrush on Miyake Island
    Strix  11-  (1)  47  -57  1992  [Not refereed][Not invited]

Industrial Property Rights

Awards & Honors

  • 2019/10 日本鳥学会 ポスター賞
     餌資源の豊富ななわばりで冬を越せた個体は、その後の繁殖が上手くいくのか? 
    受賞者: 西田有佑;高木昌興
  • 2019/09 個体群生態学会 ポスター賞優秀賞
     分散距離の性差が先か?近親交配の回避が先か? 
    受賞者: 澤田明;小野遥;高木昌興
  • 2019/03 石狩川流域湿地・水辺・海岸ネットワーク 第3回フォーラム学生ポスター最優秀賞
     オシドリ奥様のご近所づきあい 種内托卵に根差した生活史研究 
    受賞者: 坂本春菜;青木大輔;新田啓子;高木昌興
  • 2019/03 日本生態学会 ポスター賞優秀賞
     感覚便乗による鳥の声の地理的変異は交配前隔離の機構としてはたらく 
    受賞者: 植村慎吾;高木昌興
  • 2019/03 日本生態学会 英語口頭発表Best Award
     Light-level geolocators and phylogeography reveal the evolutionary uniqueness of the Japanese-endemic migratory bird subspecies 
    受賞者: Daisuke AOKI・Haruna SAKAMOTO・Hiroaki MATSUMIYA・Munehiro KITAZAWA;Masaoki TAKAGI
  • 2018/10 個体群生態学会 ポスター賞優秀賞
     Genetic data of an extinct population can offer insights into processes that a natural population successfully colonize a previously uninhabited area 
    受賞者: Daisuke AOKI;Shin MATSUI;Junko NAGATA;Mariko SENDA;Fumiaki NOMANO;Masaoki Takagi
  • 2018/09 日本鳥学会 ポスター賞
     絶滅した自然集団DNA から生物が新しい集団形成を可能にする条件を探る 
    受賞者: 青木大輔;松井晋;永田純子;千田万里子;野間野史明;髙木昌興
  • 2018/03 日本生態学会 ポスター賞最優秀賞
     オスの貯食行動は性選択によって進化した?―モズは「はやにえ」を食べてメスの誘引に重要なさえずりの質を高める― 
    受賞者: 西田有佑;高木昌興

Research Grants & Projects

  • 衛星追跡で解明する生得的なさえずりを持つ鳥類アカショウビンの生態的種分化
    KAKEN:緒戦的萌芽研究
    Date (from‐to) : 2016 -2018 
    Author : 高木 昌興
  • 人為的環境改変によるリュウキュウコノハズク二系統の同所化と浸透性交雑に関する研究
    KAKEN 基盤研究B:
    Date (from‐to) : 2016 -2016 
    Author : 高木 昌興
  • 非学習形質であるフクロウ類の鳴き声の地理的分布は遺伝構造を反映するか?
    KAKEN:基盤研究C
    Date (from‐to) : 2012 -2014 
    Author : 高木 昌興
  • 南半球における托卵性鳥類と宿主の軍拡競争の新展開:温帯ドグマからの脱却
    KAKEN:基盤研究A
    Date (from‐to) : 2011 -2014 
    Author : 上田 恵介
  • Avian Ecology
  • Inbreeding in Wild Arian Poplulation
  • Evolution of Arian Life History traits

Educational Activities

Teaching Experience

  • 自然史科学論文講読1
    開講年度 : 2018
    課程区分 : 修士課程
    開講学部 : 理学院
  • Evolutionary Biology
    開講年度 : 2018
    課程区分 : 修士課程
    開講学部 : 理学院
    キーワード : 進化生物学、行動生態学、個体群生態学、島嶼生物学、鳥類学
  • 自然史科学特別研究1
    開講年度 : 2018
    課程区分 : 修士課程
    開講学部 : 理学院
  • Methods in Biodiversity Studies
    開講年度 : 2018
    課程区分 : 修士課程
    開講学部 : 理学院
    キーワード : 生物多様性,分類,系統,古生物,進化発生学,動物,植物,海藻,原生生物,系統地理学
  • Biology II
    開講年度 : 2018
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 系統進化学,進化生物学,生態学、島嶼生物学、鳥類学、哺乳類学、保全学
  • Systematics and Evolution
    開講年度 : 2018
    課程区分 : 学士課程
    開講学部 : 理学部
    キーワード : 哺乳類 形態進化 分子進化 生物地理学 鳥類 島 生態 固有種


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