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首页> 外文期刊>Marine ecology progress series >Evidence of growth-selective predation on larval Japanese anchovy Engraulis japonicus in Sagami Bay
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Evidence of growth-selective predation on larval Japanese anchovy Engraulis japonicus in Sagami Bay

机译：相模湾日本Japanese鱼幼体生长选择性捕食的证据

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Growth-selective predation mortality was demonstrated for postlarval Japanese anchovy Engraulis japonicus in field research. The larval anchovy and their predatory fish were simultaneously captured by a trawl in Sagami Bay during October to November 2000. The growth rates analyzed by otolith microstructure were compared between the larvae from the stomach contents of the predators (prey larvae) and those from the population of origin (surviving larvae). The mean growth rates of the prey larvae collected on 28 October and 2 to 4 November (mean +- SD: 0.57 +- 0.07 mm d~(-1)) and on 23 November (0.50 +- 0.06 mm d~(-1)) were significantly lower than those of the corresponding surviving larvae (0.63 +- 0.07 and 0.54 +- 0.06 mm d~(-1), respectively). Such significant differences were not explained by size-selective predation, but were due to variations in the mean growth rates at the same larval size (i.e. non-size-related). The mean growth rates of the prey larvae were different among predatory species (barracuda Sphyraena pinguis, Japanese sea bass Lateo-labrax japonicus, white croaker Pennahia argentatus, Japanese jack mackerel Trachurus japonicus, Pacific round herring Etrumeus teres and juvenile anchovy). Comparisons of back-calculated daily growth rates showed that the decrease in growth rates of the prey larvae were consistent from directly after hatching up to predation. The larvae with lower growth rates were more vulnerable to predation, owing to the cumulative decline in growth rates from hatching to each encounter with predators, compared to the larvae with higher growth rates, even if they were the same size, at a given moment in the sea. Therefore, the level of growth rates itself had direct impact on vulnerability to predation for larval anchovy, independently of both size (size-selective mortality) and time (stage duration). In addition, such impacts could be predator specific. We propose the 'growth-selective predation' hypothesis (mechanism), which is theoretically independent of and synergistic with the existing hypotheses based on size and time under the general 'growth-mortality' concept for the survival process during the early life history of marine pelagic fish.
机译：在田间研究中证明了for鱼日本En鱼的生长选择性捕食死亡率。在2000年10月至2000年11月之间，相模湾的一条拖网捕捞了幼体their鱼及其掠食性鱼类。比较了通过耳石微结构分析的生长率，它们是从掠食者胃内容物中的幼体（捕食幼体）与种群中胃中的内容。起源（存活的幼虫）。 10月28日和11月2日至4日收集的猎物幼虫的平均增长率（平均值±SD：0.57 +-0.07 mm d〜（-1））和11月23日收集的猎物幼虫的平均增长率（0.50 +-0.06 mm d〜（-1） ））显着低于相应的存活幼虫（分别为0.63±0.07和0.54±0.06 mm d〜（-1））。这种显着差异没有通过大小选择捕食来解释，而是由于在相同幼体大小（即与大小无关）上平均增长率的变化。捕食性物种（梭鱼，日本鲈鱼Lateo-labrax japonicus，白花鱼Pennahia argentatus，日本，鲭鱼Trachurus japonicus，太平洋圆鲱鲱Etrumeus teres和少年cho鱼）的捕食幼虫的平均生长速率不同。反向计算的日增长率的比较表明，从孵化后到捕食，幼虫幼虫的增长率下降是一致的。增长率较低的幼虫更容易受到捕食，这是由于在特定时期内，从孵化到与捕食者的每一次相遇，增长率都下降了，而增长率较高的幼虫即使它们大小相同也是如此。海。因此，增长率水平本身直接影响幼体an鱼被捕食的脆弱性，而与大小（大小选择性死亡率）和时间（阶段持续时间）无关。此外，这种影响可能是捕食者特定的。我们提出了“生长选择捕食”假说（机制），该假说在理论上独立于现有假说，与现有假说基于大小和时间协同作用，适用于海洋早期生命史中生存过程的一般“增长死亡率”概念。中上层鱼类。

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