| DOI | 10.1073/pnas.2101325118
|
| Direct evidence of a prey depletion "halo" surrounding a pelagic predator colony |
| Weber S.B.; Richardson A.J.; Brown J.; Bolton M.; Clark B.L.; Godley B.J.; Leat E.; Oppel S.; Shearer L.; Soetaert K.E.R.; Weber N.; Broderick A.C.
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| 发表日期 | 2021
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| ISSN | 0027-8424
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| 卷号 | 118期号:28 |
| 英文摘要 | Colonially breeding birds and mammals form some of the largest gatherings of apex predators in the natural world and have provided model systems for studying mechanisms of population regulation in animals. According to one influential hypothesis, intense competition for food among large numbers of spatially constrained foragers should result in a zone of prey depletion surrounding such colonies, ultimately limiting their size. However, while indirect and theoretical support for this phenomenon, known as "Ashmole's halo," has steadily accumulated, direct evidence remains exceptionally scarce. Using a combination of vesselbased surveys and Global Positioning System tracking, we show that pelagic seabirds breeding at the tropical island that first inspired Ashmole's hypothesis do indeed deplete their primary prey species (flying fish; Exocoetidae spp.) over a considerable area, with reduced prey density detectable >150 km from the colony. The observed prey gradient was mirrored by an opposing trend in seabird foraging effort, could not be explained by confounding environmental variability, and can be approximated using a mechanistic consumption-dispersion model, incorporating realistic rates of seabird predation and random prey dispersal. Our results provide a rare view of the resource footprint of a pelagic seabird colony and reveal how aggregations of these central-place foraging, marine top predators profoundly influence the oceans that surround them. © 2021 National Academy of Sciences. All rights reserved. |
| 英文关键词 | Ashmole's halo; Central-place foraging; Competition; Predator-prey interaction; Seabird |
| 语种 | 英语
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| scopus关键词 | article; breeding; competition; fish; flying; foraging; global positioning system; nonhuman; predator prey interaction; sea; seabird; animal; animal behavior; bird; competitive behavior; ecosystem; evolution; feeding behavior; island (geological); physiology; predation; Animals; Behavior, Animal; Biological Evolution; Birds; Competitive Behavior; Ecosystem; Feeding Behavior; Fishes; Islands; Predatory Behavior |
| 来源期刊 | Proceedings of the National Academy of Sciences of the United States of America
(IF:9.58[JCR-2018],10.6[5-Year]) |
| 文献类型 | 期刊论文
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| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/251134
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| 作者单位 | Centre for Ecology and Conservation, University of Exeter, Penryn, Cornwall, TR10 9FE, United Kingdom; Ascension Island Government Conservation and Fisheries Department, Georgetown, Ascension Island, ASCN 1ZZ, United Kingdom; Centre for Conservation Science, Royal Society for the Protection of Birds, Sandy, Bedfordshire, SG19 2DL, United Kingdom; BirdLife International, Cambridge, CB2 3QZ, United Kingdom; Department of Estuarine and Delta Systems, Royal Netherlands Institute for Sea Research, Yerseke, 4400 AC, Netherlands
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推荐引用方式
GB/T 7714 |
Weber S.B.,Richardson A.J.,Brown J.,et al. Direct evidence of a prey depletion "halo" surrounding a pelagic predator colony[J],2021,118(28).
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| APA |
Weber S.B..,Richardson A.J..,Brown J..,Bolton M..,Clark B.L..,...&Broderick A.C..(2021).Direct evidence of a prey depletion "halo" surrounding a pelagic predator colony.Proceedings of the National Academy of Sciences of the United States of America,118(28).
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| MLA |
Weber S.B.,et al."Direct evidence of a prey depletion "halo" surrounding a pelagic predator colony".Proceedings of the National Academy of Sciences of the United States of America 118.28(2021).
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