Implications of interannual variability in euphausiid population biology for fish production along the south-west coast of Vancouver Island : a synthesis
Implications of interannual variability in euphausiid population biology for fish production along the south-west coast of Vancouver Island : a synthesis
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磷虾种群生物学的年际变化对温哥华岛西南海岸鱼类生产的影响：综合
DOI：
10.1046/j.1365-2419.2002.00185.x
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发表时间：
2002
影响因子：
2.6
通讯作者：
R. Tanasichuk
中科院分区：
文献类型：
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作者：
R. Tanasichuk
这是以温哥华岛西南海岸为研究对象的已发表和未发表的研究成果的综合。总体而言，这些研究涵盖1985-1998年，当时有两次ENSO事件和相当大的上升流变化。1991-98年间，对优势种棘突足蛾(Thysanoessa spinifera，Euphausiapacillia)的种群生物学进行了监测。物种丰富度的趋势不同。简单相关分析的结果表明，温度、盐度和上升流的变化不能解释幼体或成体真甲鱼丰度的变化，也不能解释鱼类以其为食的部分真甲鱼种群丰度的变化。我发现主要的浮游性食性鱼类的每日配给量存在显著的年际变化，但真甲鱼仍然是最重要的猎物。太平洋鳕鱼(MerLuccius Productus)是主要的浮游生物，以较大的(>；17 mm)脊椎动物为食，尽管这部分真棘鱼的生物量在1991至1997年间下降了75%，但太平洋鲱鱼(Clupea Pallasi)可能已经开始以较小的太平洋鲱鱼为食。因此，任何对鱼类生产和磷虾生物学之间关系的研究都必须考虑到鱼类开发的那部分真虾类生物量。此外，一些鱼类物种和(或)生活史阶段似乎适应了可利用真甲鱼的变化，而另一些则不适应。还必须描述和考虑这种适应的变化，以了解真甲鱼生物学的变化如何影响鱼类的生产力。
This is a synthesis of published and unpublished research on euphausiid and fish populations using the south-west coast of Vancouver Island. Overall, the studies covered 1985–98, when there were two ENSO events and considerable variation in upwelling. The population biology of the dominant euphausiids (Thysanoessa spinifera, Euphausiapacifica) was monitored during 1991–98. The species abundance trends differed. Results of simple correlation analyses suggested that variations in temperature, salinity and upwelling do not explain variations in the abundance of larval or adult euphausiids, or in the abundance of portions of euphausiid populations on which fish feed. I found significant interannual variations in daily ration of the dominant planktivorous fish species, but euphausiids remained the most important prey. Pacific hake (Merluccius productus), the dominant planktivore, fed on larger (>17 mm) T. spinifera, even though the biomass of this part of the euphausiid biomass decreased by 75% between 1991 and 1997, but Pacific herring (Clupea pallasi) may have begun feeding on smaller E. pacifica. Therefore, any study of the relationship between fish production and krill biology must consider that part of the euphausiid biomass exploited by fish. In addition, some fish species and/or life history stages appeared to adapt to changes in euphausiid availability, while others did not. Such variation in adaptations also has to be described and considered to understand how changes in euphausiid biology affect fish productivity.