Inter-colony foraging area segregation quantified in small colonies of Adelie Penguins
Inter-colony foraging area segregation quantified in small colonies of Adelie Penguins
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DOI：
10.1111/ibi.12837
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发表时间：
2020-05-06
期刊：
影响因子：
2.1
通讯作者：
Takahashi, Akinori
中科院分区：
文献类型：
--
作者：
Ito, Kentaro;Watanabe, Yuuki Y.;Takahashi, Akinori
理论模型的运动殖民动物预测，邻近的殖民地可能会隔离其觅食区，许多海鸟的研究报告存在这样的隔离。然而，这些研究往往缺乏适当的零模型来测试觅食区的邻近殖民地的影响，特别是在小殖民地或短程物种。在这里，我们研究了觅食区的阿德利企鹅Pygoscelis adeliae从两个相邻的（相距2公里）殖民地使用鸟载GPS记录仪。在东南极洲Lutzow-Holm湾的Hukuro Cove群体（104对）和Mizukuguri Cove群体（338对）进行了实地研究。我们获得了GPS跟踪504觅食行程从48鸡饲养阿德利企鹅和量化的重叠程度，在两个殖民地之间的觅食区。我们还产生了模拟的运动轨迹，使用相关的随机行走假设没有殖民地间的竞争和量化的重叠程度在模拟觅食区。最后，我们比较了从真实的GPS跟踪的结果，从模拟的轨迹，以检查相邻的殖民地对阿德利企鹅运动的影响。结果表明，重叠的程度是显着较小的真实的轨迹比在模拟轨迹。在真实的轨道中，较小的虎郎湾殖民地的觅食区域延伸到较大的水栗湾殖民地的另一边，这与模拟轨道不同。因此，我们认为，阿德利企鹅从两个相邻的殖民地隔离他们的觅食区，较大的殖民地似乎影响觅食面积较小的殖民地。
Theoretical models on the movement of colonial animals predict that neighbouring colonies may segregate their foraging areas, and many seabird studies have reported the presence of such segregations. However, these studies have often lacked the appropriate null model to test the effect of neighbouring colonies on foraging areas, especially in small colonies or in short-ranging species. Here, we examined the foraging areas of Adelie Penguins Pygoscelis adeliae from two neighbouring (2 km apart) colonies by using bird-borne GPS loggers. The field study was conducted at Hukuro Cove colony (104 pairs) and Mizukuguri Cove colony (338 pairs) in Lutzow-Holm Bay, East Antarctica. We obtained GPS tracks for 504 foraging trips from 48 chick-rearing Adelie Penguins and quantified the degree of overlap in the foraging areas between two colonies. We also produced simulated movement tracks by using correlated random-walks assuming no inter-colony competition and quantified the degree of overlap in the simulated foraging areas. Finally, we compared the results from real GPS tracks with those from simulated tracks to examine the effect of neighbouring colonies on Adelie Penguin movement. The results indicate that the degree of overlap was significantly smaller in real tracks than in simulated tracks. In real tracks, the foraging area of the smaller Hukuro Cove colony extended to the other side of the larger Mizukuguri Cove colony, unlike in simulated tracks. Consequently, we suggest that Adelie Penguins from two neighbouring colonies segregated their foraging areas and that the larger colony appeared to affect the foraging area of the smaller colony.