Mesoscale eddies and survival of late stage Pacific sardine (Sardinops sagax) larvae
Mesoscale eddies and survival of late stage Pacific sardine (Sardinops sagax) larvae
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中尺度涡流与晚期太平洋沙丁鱼（Sardinops sagax）幼虫的存活
DOI：
10.1046/j.1365-2419.2001.00152.x
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发表时间：
2001
影响因子：
2.6
通讯作者：
P. Smith
中科院分区：
文献类型：
--
作者：
E. Logerwell;P. Smith
我们研究了沙丁鱼幼虫的分布相对于环境条件的识别和表征栖息地，鼓励高幼虫生长和生存的目的，根据1983-1998年的调查加州合作海洋渔业调查（CalCOFI）。长期平均值表明，沙丁鱼的“幸存者”（空间聚集的幼虫≥ 18天）是最丰富的离岸，而沙丁鱼卵密度，叶绿素生物量和浮游动物的体积是最大的近岸。相比之下，中尺度涡旋，在遥感海面温度图像中观察到的，只发现在近海地区。为了进一步研究漩涡（通常导致局部叶绿素和浮游动物升高）与沙丁鱼生存之间的联系，我们逐个调查比较了幼虫和漩涡的分布。只有四分之一的研究调查显示，沙丁鱼幸存者在近海最丰富，当它们在近海最丰富时，它们与漩涡有关。这表明，离岸涡流栖息地产生了异常大量的幸存者，证明了长期平均的不成比例的影响。
We examined the distribution of sardine larvae relative to environmental conditions with the purpose of identifying and characterizing habitat that encourages high larval growth and survival, based on the 1983–1998 surveys of the California Cooperative Oceanic Fisheries Investigations (CalCOFI). Long-term averages show that sardine ‘survivors’ (spatially aggregated larvae ≥ 18 days old) were most abundant offshore, whereas sardine egg density, chlorophyll biomass and zooplankton volume were greatest inshore. In contrast, mesoscale eddies, observed in remotely sensed sea surface temperature imagery, were found only in offshore regions. To further examine the link between eddies – which often result in locally elevated chlorophyll and zooplankton – and sardine survival, we compared the distribution of larvae and eddies survey by survey. Sardine survivors were most abundant offshore in only one-quarter of the research surveys, and when they were most abundant offshore they were associated with eddies. This indicates that the offshore eddy habitat produced exceptionally large numbers of survivors, as evidenced by the disproportionate effect on the long-term average.