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首页> 外文期刊>Journal of Avian Biology >Prey capture and selection throughout the breeding season in a deep-diving generalist seabird, the thick-billed murre
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Prey capture and selection throughout the breeding season in a deep-diving generalist seabird, the thick-billed murre

机译：在深潜水通用海鸟的繁殖季节捕食和选择，厚厚的梅尔

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摘要

Generalist seabirds forage on a variety of prey items providing the opportunity to monitor diverse aquatic fauna simultaneously. For example, the coupling of prey consumption rates and movement patterns of generalist seabirds might be used to create three-dimensional prey distribution maps ('preyscapes') for multiple prey species in the same region. However, the complex interaction between generalist seabird foraging behaviour and the various prey types clouds the interpretation of such preyscapes, and the mechanisms underlying prey selection need to be understood before such an application can be realized. Central place foraging theory provides a theoretical model for understanding such selectivity by predicting that larger prey items should be 1) selected farther from the colony and 2) for chick-feeding compared with self-feeding, but these predictions remain untested on most seabird species. Furthermore, rarely do we know how foraging features such as handling time, capture methods or choice of foraging location varies among prey types. We used three types of animal-borne biologgers (camera loggers, GPS and depth-loggers) to examine how a generalist Arctic seabird, the thick-billed murre Uria lomvia, selects and captures their prey throughout the breeding season. Murres captured small prey at all phases of a dive, including while descending and ascending, but captured large fish mostly while ascending, with considerably longer handling times. Birds captured larger prey and dove deeper during chick-rearing. As central place foraging theory predicted, birds travelling further also brought bigger prey items for their chick. The location of a dive (distance from colony and distance to shore) best explained which prey type was the most likely to get caught in a dive, and we created a preyscape surrounding our study colony. We discuss how these findings might aid the use of generalist seabirds as bioindicators.
机译：通用海鸟在各种猎物项目上觅食，提供了同时监测各种水生动物的机会。例如，可以使用尖端消耗率和移动模式的耦合来为同一区域中的多个猎物物种创建三维猎物分布映射（'Preyscapes'）。然而，总体海鸟前进行为和各种猎物类型之间的复杂相互作用覆盖了这种占地划痕的解释，并且需要在这种应用之前需要理解潜在的选择的机制。中央地方觅食理论提供了一种理论模型，用于了解这种选择性，通过预测较大的猎物应该是1）选择的1）选择，而2）与自源相比，表喂养，但这些预测仍未在大多数海鸟物种上仍未存在。此外，我们很少知道诸如处理时间，捕获方法或觅食位置选择的觅食功能如何在猎物类型中变化。我们使用了三种类型的动物传播的生物制剂（相机记录器，GPS和深度记录器）来检查一般主义的北极海鸟，厚厚的Murre Uriia Lomvia，选择并捕获他们在整个繁殖季节的猎物。 Murres在潜水的所有阶段捕获了小猎物，包括下降和上升，但主要在上升时捕获大鱼，处理时间相当长。在小鸡饲养期间，鸟类捕获了更大的猎物和鸽子。作为中央地位的觅食理论预测，鸟类还为他们的小鸡带来了更大的猎物。潜水的位置（距离殖民地的距离和到岸边）的位置最能解释哪种猎物类型最有可能被攻击潜水，我们创建了一系列春天的研究殖民地。我们讨论这些发现如何帮助使用通用海鸟作为生物indicators。

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