Sex-specific, seasonal foraging tactics of adult grey seals (Halichoerus grypus) revealed by state-space analysis
Sex-specific, seasonal foraging tactics of adult grey seals (Halichoerus grypus) revealed by state-space analysis
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DOI：
10.1890/07-1483.1
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发表时间：
2009-11-01
期刊：
影响因子：
4.8
通讯作者：
Leonard, Marty L.
中科院分区：
文献类型：
--
作者：
Breed, Greg A.;Jonsen, Ian D.;Leonard, Marty L.
在许多大型远洋动物中，观察行为仅限于通过无线电或卫星遥测进行观察。在许多情况下，从遥感数据中区分不同的行为一直是一个关键但往往难以捉摸的目标。在这里，我们使用状态空间模型（SSM），以适应相关的随机游走（CRW）模型，两个未观察到的行为状态（名义上觅食和旅行）之间切换到41名男性和43名女性成年灰海豹（Halichoerus grypus）卫星遥测跟踪。SSM的结果揭示了显着不同的空间行为之间的性别，拟合与性别大小二型性和已知的饮食差异，这表明性别处理季节性猎物的可用性和生殖成本不同。从这些结果中，我们也能够产生行为知情的栖息地使用地图，显示了一个复杂的和动态的网络的小，密集使用的觅食区。我们灵活的SSM方法清楚地表明了与性别相关的行为差异。新尺度的空间和时间觅食模式，更清晰地了解灰海豹生态和在斯科舍陆架生态系统中的作用。
In many large pelagic animals, observing behavior is limited to observation by radio or satellite telemetry. In many cases, discriminating different behaviors from telemetry data has been a key, but often elusive, goal. Here we use state-space models (SSMs) to fit a correlated random walk (CRW) model that switches between two unobserved behavioral states (nominally foraging and traveling) to 41 male and 43 female adult grey seal (Halichoerus grypus) satellite telemetry tracks. The SSM results reveal markedly different spatial behavior between the sexes, fitting well with sexual size dimorphism and known dietary differences, suggesting that the sexes deal with seasonal prey availability and reproductive costs differently. From these results we were also able to produce behaviorally informed habitat use maps, showing a complex and dynamic network of small, intensely used foraging areas. Our flexible SSM approach clearly demonstrates sex-related behavioral differences,. ne scale spatial and temporal foraging patterns, and a clearer picture of grey seal ecology and role in the Scotian Shelf ecosystem.