A synthesis of large-scale patterns in the planktonic prey of larval and juvenile cod (Gadus morhua)
A synthesis of large-scale patterns in the planktonic prey of larval and juvenile cod (Gadus morhua)
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DOI：
10.1111/j.1365-2419.2006.00423.x
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发表时间：
2007-01-01
影响因子：
2.6
通讯作者：
Lough, R. G.
中科院分区：
文献类型：
--
作者：
Heath, M. R.;Lough, R. G.
摘要对北大西洋北部地区40份已发表的关于鳕鱼幼鱼和幼鱼的研究数据进行了总结，以评估其主要猎物的个体发育和区域变异的一般模式。结果表明，北缘鳕鱼的幼虫主要依赖于桡足类的发育阶段，而南缘鳕鱼的幼虫主要依赖于准桡足类和拟桡足类。幼鱼的捕食区系范围较幼鱼大，但幼鱼是主要的目标猎物。连续浮游生物记录（CPR）调查结果显示，在浮游生物中，C. finmarchicus和Para/ pseudoalanus spp.相对丰度的区域差异与鳕鱼幼虫胃内容物具有相似的地理格局。20世纪60年代和70年代的CPR数据与20世纪90年代的数据比较表明，在大西洋两岸，C. finmarchicus和Para/ pseudoalanus spp.的优势边界向北移动，而在南部鳕鱼种群区，euphausiids的丰度下降。讨论了鳕鱼种群对气候变率响应的区域差异。
Data from 40 published studies of the diet composition of larval and juvenile cod (Gadus morhua) from around the northern North Atlantic were summarized to assess generic patterns in ontogenetic and regional variability in the key prey. The results showed that larvae at the northern edge of the latitudinal range of cod depend primarily on development stages of the copepod Calanus finmarchicus, whilst those at the southern edge depend on Para- and Pseudocalanus species. Juvenile cod preyed on a wider range of taxa than larvae, but euphausiids were the main target prey. Analysis of regional variations in the relative abundances of C. finmarchicus and Para/Pseudocalanus spp. in the plankton, as estimated by the continuous plankton recorder (CPR) surveys, showed a similar geographical pattern to the larval cod stomach contents. Comparison of CPR data from the 1960s and 70s with data from the 1990s showed that the boundary between C. finmarchicus and Para/Pseudocalanus spp. dominance has shifted northwards on both sides of the Atlantic, whilst the abundance of euphausiids in the southern cod stock regions has declined. The results are discussed in relation to regional differences in the response of cod stocks to climate variability.