Predation dynamics of mackerel on larval and juvenile anchovy: is capture success linked to prey condition?
Predation dynamics of mackerel on larval and juvenile anchovy: is capture success linked to prey condition?
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鲭鱼对幼鱼和幼鱼的捕食动态：捕获成功与猎物状况有关吗？
DOI：
10.1007/s12562-009-0205-y
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发表时间：
2010
影响因子：
1.9
通讯作者：
L. Fortier
中科院分区：
文献类型：
--
作者：
D. Robert;A. Takasuka;S. Nakatsuka;H. Kubota;Y. Oozeki;H. Nishida;L. Fortier
我们检验了青鱼和青鱼对幼鱼的捕食动态是否与被捕食者个体的生长特征有关，并可以解释补充假说所预测的生长选择性存活。2004年和2005年，日本本州太平洋沿岸的幼鱼(幼鱼和幼鱼)和幼鱼(成鱼和幼鱼)随幼鱼捕食场一起采集了样本。根据耳石的显微结构，估算了在鲱鱼胃中发现的仔鱼、幼鱼和猎物最近5天的平均生长率。存活的幼体或幼体的近期生长与被捕食的个体之间没有显著差异。我们的结论是，尽管鲱鱼的体型相对较小，但其高活动水平和捕食技能阻止了快速生长的幼体和早期幼体在预期的生存优势方面受益于慢速生长的幼体。因此，幼鱼的生长选择性捕食死亡率将取决于捕食者的摄食生态，而不是捕食者的大小。快速生长的选择更有可能发生在无脊椎动物和小型中上层鱼类的捕食压力下，这些鱼类专门从事浮游动物，如鲱鱼和凤尾鱼。
We tested whether the predation dynamics of chub mackerel Scomber japonicus and spotted mackerel S. australasicus on young anchovy Engraulis japonicus relates to individual growth characteristics of the prey and could account for the growth-selective survival predicted by recruitment hypotheses. Juvenile and adult mackerel were sampled along with their young anchovy prey field in 2004 (juvenile mackerel and larval anchovy) and 2005 (adult mackerel and juvenile anchovy) off the Pacific coast of Honshu, Japan. The recent 5-day mean growth rate of larval and juvenile survivors and prey found in the stomach of mackerel was estimated from the otolith microstructure. No significant difference was found between the recent growth of larval or juvenile survivors and that of preyed individuals. We conclude that despite a relatively small body size, the high activity level and predation skills displayed by mackerel prevent fast-growing larvae and early juveniles from benefitting in terms of the expected survival advantage over slow-growers. Hence, growth-selective predation mortality of larval fish would depend on the feeding ecology of the predator rather than predator size. Selection for fast growth is more likely to occur under predation pressure from invertebrate organisms and small pelagic fish specialized on zooplankton, such as herring and anchovy.
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
Md. Shahidul Islam;Masahiro Ueno;Yoh Yamashita
通讯作者：
Yoh Yamashita
影响因子：
2.6
作者：
Takahashi, M;Watanabe, Y;Watanabe, C
通讯作者：
Watanabe, C