Individual differences in searching behaviour and spatial foraging consistency in a central place marine predator
Individual differences in searching behaviour and spatial foraging consistency in a central place marine predator
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中心位置海洋捕食者搜索行为和空间觅食一致性的个体差异
DOI：
10.1111/j.1600-0706.2013.00406.x
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发表时间：
2013
期刊：
影响因子：
3.4
通讯作者：
Patrick S
中科院分区：
文献类型：
--
作者：
Patrick S
一致的群体内变异觅食行为中发现了广泛的类群。这种觅食的专门化在海洋脊椎动物中很常见，但目前尚不清楚个体如何在海洋范围内反复定位猎物或觅食地点。使用GPS和时间深度记录仪，我们研究了细尺度觅食行为的中心位置北方gannetsMorus danganusat两个大的殖民地。首先，我们估计了重复旅行中个体觅食路线和地点的一致性程度。其次，我们测试了搜索行为的个体差异，以响应环境协变量使用反应规范，估计从混合效应模型。成年塘鹅跟踪多个觅食行程表现出可重复的个体之间的差异，在终点和觅食行程的出发角度，但重复性较低的行程持续时间和行程长度。重要的是，个别鸟类表现出高度可重复的潜水位置，具有一贯不同的环境条件（如桡足类丰度），这表明了高度的觅食地点专业化。塘鹅还表现出个体间差异的搜索行为沿着环境梯度，使个人加强搜索在不同的条件下。这些结果表明，广泛的个体觅食一致性可能代表了专业化，并与个体对环境条件的反应有关。这种不同的搜索行为可能提供了一种机制，通过这种机制，在大空间尺度上觅食的动物之间产生并维持一致的觅食行为。
Consistent intra‐population variability in foraging behaviour is found among a wide range of taxa. Such foraging specialisations are common among marine vertebrates, yet it is not clear how individuals repeatedly locate prey or foraging sites at ocean‐wide scales. Using GPS and time‐depth loggers we studied the fine‐scale foraging behaviour of central‐place northern gannetsMorus bassanusat two large colonies. First, we estimated the degree of consistency in individual foraging routes and sites across repeated trips. Second, we tested for individual differences in searching behaviour in response to environmental covariates using reaction norms, estimated from mixed effect models. Adult gannets tracked over multiple foraging trips showed repeatable between‐individual differences in terminal points and departure angles of foraging trips, but low repeatability in trip duration and trip length. Importantly, individual birds showed highly repeatable dive locations, with consistently different environmental conditions (such as copepod abundance), suggesting a high degree of foraging site specialisation. Gannets also showed between‐individual differences in searching behaviour along environmental gradients, such that individuals intensified searching under different conditions. Together these results suggest that widespread individual foraging consistency may represent specialisation and be linked with individual responses to environmental conditions. Such divergent searching behaviour could provide a mechanism by which consistent foraging behaviour arises and is maintained among animals that forage across large spatial scales.
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影响因子：
2.7
作者：
Araujo, Marcio S.;Bolnick, Daniel I.;dos Reis, Sergio F.
通讯作者：
dos Reis, Sergio F.
影响因子：
4.8
作者：
Hamer, K. C.;Humphreys, E. M.;Wanless, S.
通讯作者：
Wanless, S.
DOI：
10.2307/2529571
发表时间：
1992-04
期刊：
--
影响因子：
--
作者：
W. Becker
通讯作者：
W. Becker
远距离中心捕食者的规模依赖性栖息地利用
影响因子：
4.8
作者：
D. Pinaud;H. Weimerskirch
通讯作者：
H. Weimerskirch
影响因子：
2.9
作者：
SHINE, R
通讯作者：
SHINE, R