Ocean climate and seal condition.
Ocean climate and seal condition.
复制标题
海洋气候和密封状况。
DOI：
10.1186/1741-7007-3-9
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发表时间：
2005-03-28
期刊：
影响因子：
5.4
通讯作者：
Crocker, DE
中科院分区：
文献类型：
--
作者：
Le Boeuf, BJ;Crocker, DE
许多海洋哺乳动物的状况随着它们觅食的海洋盆地的生产力和食物供应的波动而变化。猎物受到诸如周期性变暖趋势等物理环境变量的影响。北象海豹幼崽的断奶体重与母海豹状况密切相关，间接反映了东北太平洋深水区怀孕母海豹的猎物可得性和觅食成功率。本研究的目的是研究海洋气候对三十年来这种深潜海洋哺乳动物觅食成功的影响，使用群体断奶体重作为成功获取资源的主要指标。从1975年到20世纪90年代末，幼崽的年平均断奶重下降，这一时期的特征是一个大规模的、盆地范围的暖年代际机制，包括多次强或长时间的El Niños；从1999年到2004年，随着回归到凉爽的十年制而增加。成年雌性的觅食努力增加和体重增加减少，表明觅食成功率降低和营养压力，与海洋高温有关。尽管在东北太平洋沿海温跃带以外的寒冷水域广泛分布并深入觅食，但海象受到海洋热动力学的显著影响。海洋变暖重新分配了猎物，降低了雌性的觅食成功率，从而导致幼崽断奶量减少。断奶数量的年度波动反过来反映了雌性在分娩前一年的觅食成功，并标志着海洋温度周期的变化。
The condition of many marine mammals varies with fluctuations in productivity and food supply in the ocean basin where they forage. Prey is impacted by physical environmental variables such as cyclic warming trends. The weaning weight of northern elephant seal pups, Mirounga angustirostris, being closely linked to maternal condition, indirectly reflects prey availability and foraging success of pregnant females in deep waters of the northeastern Pacific. The aim of this study was to examine the effect of ocean climate on foraging success in this deep-diving marine mammal over the course of three decades, using cohort weaning weight as the principal metric of successful resource accrual. The mean annual weaning weight of pups declined from 1975 to the late 1990s, a period characterized by a large-scale, basin-wide warm decadal regime that included multiple strong or long-duration El Niños; and increased with a return to a cool decadal regime from about 1999 to 2004. Increased foraging effort and decreased mass gain of adult females, indicative of reduced foraging success and nutritional stress, were associated with high ocean temperatures. Despite ranging widely and foraging deeply in cold waters beyond coastal thermoclines in the northeastern Pacific, elephant seals are impacted significantly by ocean thermal dynamics. Ocean warming redistributes prey decreasing foraging success of females, which in turn leads to lower weaning mass of pups. Annual fluctuations in weaning mass, in turn, reflect the foraging success of females during the year prior to giving birth and signals changes in ocean temperature cycles.
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影响因子：
4.8
作者：
Jones, CG;Lawton, JH;Shachak, M
通讯作者：
Shachak, M
影响因子：
4.1
作者：
Hare, SR;Mantua, NJ
通讯作者：
Mantua, NJ
影响因子：
2
作者：
COSTA, DP;LEBOEUF, BJ;ORTIZ, CL
通讯作者：
ORTIZ, CL
DOI：
10.1098/rstb.1992.0152
发表时间：
1992-11-30
期刊：
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES
影响因子：
--
作者：
CROXALL, JP
通讯作者：
CROXALL, JP
DOI：
10.1086/physzool.69.4.30164234
发表时间：
1996-07-01
期刊：
PHYSIOLOGICAL ZOOLOGY
影响因子：
--
作者：
Fedak, MA;Arnbom, T;Boyd, IL
通讯作者：
Boyd, IL