Ornithological Science最新文献_第2页

Colour Aberration in the Western Jackdaw Corvus monedula 西部寒鸦的色差

IF 0.6 4区生物学

Ornithological Science Pub Date : 2023-07-26 DOI: 10.2326/osj.22.195

Zuzanna Zaradzka

引用次数: 0

Stable Isotope Differences among Species, Sexes, and Breeding Stages of Laysan and Black-Footed Albatrosses in the Western North Pacific 北太平洋西部黑背信天翁和黑足信天翁物种、性别和繁殖期的稳定同位素差异

IF 0.6 4区生物学

Ornithological Science Pub Date : 2023-01-26 DOI: 10.2326/osj.22.3

Y. Inoue, S. Nakatsuka, Y. Niizuma, D. Ochi, N. Katsumata, K. Okamoto, Y. Ishihi, K. Oshima, H. Minami

{"title":"Stable Isotope Differences among Species, Sexes, and Breeding Stages of Laysan and Black-Footed Albatrosses in the Western North Pacific","authors":"Y. Inoue, S. Nakatsuka, Y. Niizuma, D. Ochi, N. Katsumata, K. Okamoto, Y. Ishihi, K. Oshima, H. Minami","doi":"10.2326/osj.22.3","DOIUrl":"https://doi.org/10.2326/osj.22.3","url":null,"abstract":"Abstract In order to understand the diet of Laysan Albatross Phoebastria immutabilis and Black-footed Albatross P. nigripes in western North Pacific waters, we investigated isotopic differences between species, sexes and breeding stages. We measured carbon and nitrogen isotope ratios in the muscles and livers of albatrosses (caught during Japanese pelagic longline fishing) and in their potential prey. Both δ 13C and δ15N of Black-footed Albatross were higher than those of Laysan Albatross. Delta13C of both species differed seasonally and δ13C was lower during the incubation period than during the chick-provisioning and non-breeding periods. The δ 13C and δ15N levels of males did not differ from those of females in either species. Our results suggest that Black-footed Albatross forages on higher isotope prey items and/or Laysan Albatross forages on lower isotope prey items other than squid and fish and that δ13C varies in response to seasonal variation in prey availability. This implies that Black-footed Albatross forages more on discard from the fishing industry than does Laysan Albatross; this in turn may be related to the areas of operation sea area of the longline fisheries in the western North Pacific. In conclusion, it is important for conservation of these two albatross species to monitor their diets and foraging areas and to identify the species-specific high-risk areas where albatross bycatch is most likely.","PeriodicalId":49009,"journal":{"name":"Ornithological Science","volume":"22 1","pages":"3 - 14"},"PeriodicalIF":0.6,"publicationDate":"2023-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44482469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Estimation of Condition-Dependent Dispersal Kernel with Simple Bayesian Regression Analysis 条件相关分散核的简单贝叶斯回归估计

IF 0.6 4区生物学

Ornithological Science Pub Date : 2023-01-26 DOI: 10.2326/osj.22.25

A. Sawada, Tetsuya Iwasaki, Chitose Inoue, K. Nakaoka, Takumi Nakanishi, Junpei Sawada, Narumi Aso, Syuya Nagai, Haruka Ono, Ryota Murakami, M. Takagi

引用次数: 1

Adaptive Features of the Eye to the Ecological Habit of the Short-Eared Owl Asio flammeus and Japanese Scops Owl Otus semitorques 短耳鸮(Asio flammeus)和日本鸮(Otus semiorques)眼睛对生态习性的适应特征

IF 0.6 4区生物学

Ornithological Science Pub Date : 2023-01-26 DOI: 10.2326/osj.22.35

Hiroyuki Nishimura, N. Nakamuta, Yoshio Yamamoto

{"title":"Adaptive Features of the Eye to the Ecological Habit of the Short-Eared Owl Asio flammeus and Japanese Scops Owl Otus semitorques","authors":"Hiroyuki Nishimura, N. Nakamuta, Yoshio Yamamoto","doi":"10.2326/osj.22.35","DOIUrl":"https://doi.org/10.2326/osj.22.35","url":null,"abstract":"Abstract In this study we investigated the eye morphology and retinal topography of two owl species in relation to their visual environment. Although Short-eared Owl Asio flammeus is larger and weighs more than Japanese Scops Owl Otus semitorques, its eye dimensions (weight, corneal diameter, and axial length) are all smaller than the scops owl's. Owl retinas were examined in Nissl-stained whole-mount preparations. The total number of retinal ganglion cells (RGCs) was greater in the Japanese Scops Owl (4,703.0×103 cells) than in the Short-eared Owl (2,346.8×103 cells). The eye morphology of, and the number of RGCs in the Japanese Scops Owl indicate that it is more adapted to a nocturnal habit. An area of high-density RGCs was horizontally distributed in the temporal retina of the Short-eared Owl, with a peak density of 17.4×103 cells/mm2. In the Japanese Scops Owl's temporal retina, there was an oval-shaped arrangement with a peak density of 23.1×103 cells/mm2. These distributions indicate that whereas Short-eared Owl is adapted to open habitats, Japanese Scops Owl is adapted to enclosed habitats. The RGCs of both species were classified into three categories (small, medium, and large) based on the size and appearance of somas. In both species, medium-sized cells predominated, and the proportion of large-sized cells was smallest. The distribution and high-density areas differed among these groups, suggesting adaptation to the visual environment. The high-density areas of these groups cover the nasal visual fields, which include the overlap for binocular vision.","PeriodicalId":49009,"journal":{"name":"Ornithological Science","volume":"22 1","pages":"35 - 44"},"PeriodicalIF":0.6,"publicationDate":"2023-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45939175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rattling Call of Crested Honey Buzzard Pernis ptilorhynchus 冠蜜秃鹰的鸣叫

IF 0.6 4区生物学

Ornithological Science Pub Date : 2023-01-26 DOI: 10.2326/osj.22.97

Taichi Kato, C. Chiu, Die-Hua Tsai, Elena Pavlenko, M. Kosareva, Hironobu Itou, Haruka Kono

引用次数: 0

Effects of Landscape, Climate and Hunting on the Occurrence of White-Browed Guan Penelope jacucaca in Central-North Caatinga, Brazil 景观、气候和狩猎对巴西卡廷加中北部白眉关佩内洛普jacucaca发生的影响

IF 0.6 4区生物学

Ornithological Science Pub Date : 2023-01-26 DOI: 10.2326/osj.22.15

G. M. De La Torre, Nicholas Kaminski, Jean Júnior Barcik, Jullio Marques, P. A. Nicola, L. C. M. Pereira

{"title":"Effects of Landscape, Climate and Hunting on the Occurrence of White-Browed Guan Penelope jacucaca in Central-North Caatinga, Brazil","authors":"G. M. De La Torre, Nicholas Kaminski, Jean Júnior Barcik, Jullio Marques, P. A. Nicola, L. C. M. Pereira","doi":"10.2326/osj.22.15","DOIUrl":"https://doi.org/10.2326/osj.22.15","url":null,"abstract":"Abstract The White-browed Guan Penelope jacucaca is an endangered member of the family Cracidae endemic to the Caatinga region of northeast Brazil. Hunting and habitat loss are the presumed major threats to the species, however, their impacts on its occurrence have been insufficiently tested. We used field observations and information on hunting activity to assess whether hunting, landscape and/or climate affect the occurrence of the White-browed Guan in the Caatinga. We sampled 23 localities within the Caatinga and recorded the species' occurrence and hunting encounters. For each locality, we extracted three landscape metrics (vegetation cover, patch aggregation, and patch richness); two climate variables (temperature seasonality and mean precipitation of the wettest month); and one topographic variable (mean slope). We then used generalized linear models based on proportion to determine if the species' occurrence was related to these environmental factors. We found a greater likelihood of detecting the species in localities with greater slope, greater heterogeneity of habitats and more stable temperatures, whereas hunting activity presented a trend of negative impact on occurrence. Our results emphasize the relevance of using different environmental metrics to implement conservation programs for this threatened species.","PeriodicalId":49009,"journal":{"name":"Ornithological Science","volume":"22 1","pages":"15 - 24"},"PeriodicalIF":0.6,"publicationDate":"2023-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47431124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Message from the Editor-In-Chief 总编辑寄语

IF 0.6 4区生物学

Ornithological Science Pub Date : 2023-01-26 DOI: 10.2326/osj.22.1

T. Mizuta

引用次数: 0

First Report of Home Range Size of Hainan Partridge Arborophila ardens, a Vulnerable Species Endemic to Hainan Island 海南岛特有脆弱物种海南嗜树鹧鸪家域大小初报

IF 0.6 4区生物学

Ornithological Science Pub Date : 2023-01-26 DOI: 10.2326/osj.22.87

Canchao Yang, Xiangyang Chen, Zhengwang Zhang, W. Liang

引用次数: 0

Asian Koel Removes Nestlings of Elliot's Laughingthrush from Their Nest: Farming or Retaliatory Mafia Behavior? 亚洲野鸡将艾略特笑鸫的雏鸟从巢中移走:农业行为还是报复黑手党行为?