Interspecific and intraspecific foraging differentiation of neighbouring tropical seabirds.
Interspecific and intraspecific foraging differentiation of neighbouring tropical seabirds.
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DOI：
10.1186/s40462-021-00251-z
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发表时间：
2021-05-26
期刊：
影响因子：
4.1
通讯作者：
Green JA
中科院分区：
文献类型：
--
作者：
Austin RE;De Pascalis F;Votier SC;Haakonsson J;Arnould JPY;Ebanks-Petrie G;Newton J;Harvey J;Green JA
社会互动、生殖需求和内在限制都会影响动物的觅食决定。了解这些因素在塑造群落内共存物种利用和划分资源方式方面的相对重要性，是了解生态和进化过程的核心。然而，在海洋环境中，我们对导致和允许共存的机制的了解有限，特别是在热带地区。利用一套动物携带的数据记录器(GPS、深度记录器、沉浸和视频)、食物样本和稳定同位素的同步数据，我们调查了两个密切相关的海鸟物种(红脚海鸟和棕色海鸟)在从加勒比海开曼群岛邻近殖民地觅食时的种间和种内差异。这两个物种采用了明显不同的觅食策略，具有明显的空间隔离，但物种间食物分配的证据有限。体型较大的棕色袋鼠在浅海水域觅食，而体型较小的红脚袋鼠则在更远的海域觅食。红足胸脯在觅食行为上几乎没有性别差异，而雄性和雌性棕色胸脯在栖息地用途、觅食特征和食物贡献方面存在差异。我们认为，这些行为差异可能与体型二态和竞争有关：在规模较小的棕色鱼群(n <； 200只)中，体型较大的雌性更倾向于呆在沿海水域，在那里它们经历了来自宏伟护卫舰的偷盗寄生攻击，而从未被盗寄生的较小雄性迁徙到更远的离岸，可能是到盗寄压力较低的栖息地。在弱二形红足乳房中，这些差异不那么明显。取而代之的是，在推动两性迁徙方面，对其庞大人口(n> ；2000人)的密度依赖压力和避免偷盗寄生症可能更为普遍。我们的结果揭示了，在猎物多样化的机会有限的环境中，邻近的海鸟物种是如何在海上隔离的，同时表现出不同程度的性别分化。虽然观察到的模式背后的机制尚不清楚，但我们的数据与这样的观点是一致的，即涉及同种和异种的多种因素，以及生殖压力，可能共同影响这些邻近热带物种的觅食差异。网上版载有补充材料，可在10.1186/s40462-021-00251-z查阅。
Social interactions, reproductive demands and intrinsic constraints all influence foraging decisions in animals. Understanding the relative importance of these factors in shaping the way that coexisting species within communities use and partition resources is central to knowledge of ecological and evolutionary processes. However, in marine environments, our understanding of the mechanisms that lead to and allow coexistence is limited, particularly in the tropics. Using simultaneous data from a suite of animal-borne data loggers (GPS, depth recorders, immersion and video), dietary samples and stable isotopes, we investigated interspecific and intraspecific differences in foraging of two closely-related seabird species (the red-footed booby and brown booby) from neighbouring colonies on the Cayman Islands in the Caribbean. The two species employed notably different foraging strategies, with marked spatial segregation, but limited evidence of interspecific dietary partitioning. The larger-bodied brown booby foraged within neritic waters, with the smaller-bodied red-footed booby travelling further offshore. Almost no sex differences were detected in foraging behaviour of red-footed boobies, while male and female brown boobies differed in their habitat use, foraging characteristics and dietary contributions. We suggest that these behavioural differences may relate to size dimorphism and competition: In the small brown booby population (n < 200 individuals), larger females showed a higher propensity to remain in coastal waters where they experienced kleptoparasitic attacks from magnificent frigatebirds, while smaller males that were never kleptoparasitised travelled further offshore, presumably into habitats with lower kleptoparasitic pressure. In weakly dimorphic red-footed boobies, these differences are less pronounced. Instead, density-dependent pressures on their large population (n > 2000 individuals) and avoidance of kleptoparasitism may be more prevalent in driving movements for both sexes. Our results reveal how, in an environment where opportunities for prey diversification are limited, neighbouring seabird species segregate at-sea, while exhibiting differing degrees of sexual differentiation. While the mechanisms underlying observed patterns remain unclear, our data are consistent with the idea that multiple factors involving both conspecifics and heterospecifics, as well as reproductive pressures, may combine to influence foraging differences in these neighbouring tropical species. The online version contains supplementary material available at 10.1186/s40462-021-00251-z.
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影响因子：
3.1
作者：
AU, DWK;PITMAN, RL
通讯作者：
PITMAN, RL
影响因子：
2.9
作者：
EMLEN, JM
通讯作者：
EMLEN, JM
影响因子：
4.8
作者：
Jones, CG;Lawton, JH;Shachak, M
通讯作者：
Shachak, M
影响因子：
2.5
作者：
BIRT, VL;BIRT, TP;MONTEVECCHI, WA
通讯作者：
MONTEVECCHI, WA
影响因子：
2.1
作者：
DIAMOND, AW
通讯作者：
DIAMOND, AW