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 Adélie 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 Lützow‐Holm Bay, East Antarctica. We obtained GPS tracks for 504 foraging trips from 48 chick‐rearing Adélie 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 Adélie 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 Adélie Penguins from two neighbouring colonies segregated their foraging areas and that the larger colony appeared to affect the foraging area of the smaller colony.

中文翻译：

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殖民地之间的觅食区隔离在阿德利企鹅的小殖民地中得以量化

关于殖民地动物活动的理论模型预测，邻近的殖民地可能会将其觅食区隔离开来，许多海鸟研究都报告了这种隔离的存在。但是，这些研究通常缺乏适当的无效模型来测试邻近菌落对觅食区的影响，尤其是在小菌落或短距离物种中。在这里，我们检查了Adélie企鹅Pygoscelis adeliae的觅食区使用鸟载GPS记录仪从两个相邻（相距2公里）的殖民地中采集。实地研究是在南极东部吕茨霍姆湾的Hukuro Cove殖民地（104对）和Mizukuguri Cove殖民地（338对）进行的。我们从48个饲养阿德利企鹅的企鹅那里获得了504次觅食旅行的GPS轨迹，并量化了两个菌落之间觅食区域的重叠程度。我们还通过使用相关的随机游走（假设没有殖民地竞争）来模拟运动轨迹，并量化了模拟觅食区的重叠程度。最后，我们将真实GPS航迹的结果与模拟航迹的结果进行了比较，以检验邻近殖民地对AdéliePenguin运动的影响。结果表明，真实轨道中的重叠程度明显小于模拟轨道中的重叠程度。在真实的轨道上 较小的Hukuro Cove殖民地的觅食区域延伸到了Mizukuguri Cove较大殖民地的另一侧，这与模拟径迹不同。因此，我们建议来自两个相邻殖民地的阿德利企鹅将它们的觅食区域隔离开来，而较大的殖民地似乎会影响较小殖民地的觅食区域。