Foraging strategies of southern elephant seals (Mirounga leonina) in relation to frontal zones and water masses
Foraging strategies of southern elephant seals (Mirounga leonina) in relation to frontal zones and water masses
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DOI：
10.1017/s0954102001000529
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发表时间：
2001-12-01
影响因子：
1.6
通讯作者：
Michael, K
中科院分区：
文献类型：
--
作者：
Field, I;Hindell, M;Michael, K
地理定位-时间-深度-温度记录仪 (GLTDTR) 连续记录了来自麦格理岛的 10 只雌性南象海豹在繁殖后的出海旅行期间与水温相关的潜水行为。根据 GLTDTR 记录的深度/温度剖面确定了四个水体。这些水体对应于亚南极模式水体（SAMW）、极锋区水体（PFZW）、极锋水体（PFW）和南极水团（AWM）。这些水体中的热结构不会影响海豹的潜水行为。所有区域的总体平均潜水深度、夜间潜水深度、日间潜水深度和潜水持续时间相似。然而，当个体在不同水体之间移动时，他们的行为确实发生了变化。海豹在研究的两个不同年份也使用了不同的水体。我们认为海豹觅食行为的变化是与当地海洋条件相关的猎物分布的结果，但也反映了热区内重要的个体觅食策略。
Geolocating-time-depth-temperature-recorders (GLTDTR) provided a continuous record of diving behaviour in relation to water temperature for ten female southern elephant seals from Macquarie Island during their post-breeding trips to sea, Four water bodies were determined from depth/temperature profiles recorded by the GLTDTRs. These water bodies corresponded to Sub-Antarctic Mode Water (SAMW), Polar Front Zone Water (PFZW), Polar Front Water (PFW) and Antarctic Water Masses (AWM). Thermal structures within these water bodies did not influence seal diving behaviour. Overall mean dive depth, nocturnal dive depths, diurnal dive depths and dive duration were similar in all areas. However, individuals did change behaviour as they moved between different water bodies. Seals also used different water bodies in the two different years of the study. We suggest that variations in foraging behaviour among seals are a result of prey distribution associated with local oceanographic conditions, but also reflect important individual foraging strategies within thermal zones.