Central place foragers select ocean surface convergent features despite differing foraging strategies
Central place foragers select ocean surface convergent features despite differing foraging strategies
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尽管觅食策略不同，中心地点觅食者仍选择海洋表面汇聚特征
DOI：
10.1038/s41598-018-35901-7
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发表时间：
2019
影响因子：
4.6
通讯作者：
Filipa Carvalho
中科院分区：
文献类型：
--
作者：
M. Oliver;J. Kohut;K. Bernard;W. Fraser;P. Winsor;H. Statscewich;E. Fredj;M. Cimino;D. Patterson;Filipa Carvalho
发现觅食地点的预测因子可能具有挑战性，并且通常是解释所观察到的捕食者运动模式的生态意义的关键缺失部分。在动态的沿海海洋系统中尤其如此，在那里，营养食物资源分散，必须在物理上或生物上集中起来，以维持较高的营养水平。在南极半岛西部，最近的气候变化在帕尔默深峡谷附近的一个已知生物热点造成了阿德利企鹅和巴布亚企鹅之间新的觅食同域。我们利用最近的同域性作为一个机会，调查如何动态的本地海洋学特征影响这两个物种的觅食生态方面。模拟粒子轨迹从测量的表面电流被用来调查收敛的海洋功能和企鹅觅食位置的共同出现。阿德利企鹅潜水活动仅限于上混合层，而巴布亚企鹅觅食往往比混合层深得多，这表明阿德利企鹅可能更响应动态表面收敛功能相比，巴布亚企鹅。我们发现，尽管潜水和觅食行为有很大的差异，浅潜水阿德利企鹅和深潜水巴布亚企鹅强烈选择表面收敛功能。此外，对浅潜和深潜的巴布亚企鹅的选择性没有差异。我们的研究结果表明，这两个mesopredators选择表面收敛功能，然而，这些表面信号是如何与地下猎物领域是未知的。
Discovering the predictors of foraging locations can be challenging, and is often the critical missing piece for interpreting the ecological significance of observed movement patterns of predators. This is especially true in dynamic coastal marine systems, where planktonic food resources are diffuse and must be either physically or biologically concentrated to support upper trophic levels. In the Western Antarctic Peninsula, recent climate change has created new foraging sympatry between Adélie (Pygoscelis adeliae) and gentoo (P. papua) penguins in a known biological hotspot near Palmer Deep canyon. We used this recent sympatry as an opportunity to investigate how dynamic local oceanographic features affect aspects of the foraging ecology of these two species. Simulated particle trajectories from measured surface currents were used to investigate the co-occurrence of convergent ocean features and penguin foraging locations. Adélie penguin diving activity was restricted to the upper mixed layer, while gentoo penguins often foraged much deeper than the mixed layer, suggesting that Adélie penguins may be more responsive to dynamic surface convergent features compared to gentoo penguins. We found that, despite large differences in diving and foraging behavior, both shallow-diving Adélie and deeper-diving gentoo penguins strongly selected for surface convergent features. Furthermore, there was no difference in selectivity for shallow- versus deep-diving gentoo penguins. Our results suggest that these two mesopredators are selecting surface convergent features, however, how these surface signals are related to subsurface prey fields is unknown.
DOI：
10.1073/pnas.1320424111
发表时间：
2014-02-25
影响因子：
11.1
作者：
Palyulin, Vladimir V.;Chechkin, Aleksei V.;Metzler, Ralf
通讯作者：
Metzler, Ralf