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首页> 外文期刊>Journal of Fish Biology >Spring cannibalism on 1 year walleye pollock in the Doto area, northernJapan: is it density dependent?
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Spring cannibalism on 1 year walleye pollock in the Doto area, northernJapan: is it density dependent?

机译：日本北部渡渡区1年大眼鲷的春季食人症：它是否与密度有关？

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摘要

Cannibalism in walleye pollock off the eastern coast of the Hokkaido Island, Japan was important only during spring (April to June), and its importance increased from 0% in dry mass for < 200 mm L-S fish to 48(.)9% for > 400 mm Ls fish. Most of the prey was represented by age I year fish, showing a unimodal body size distribution with a mode at 121-130 mm. Although cannibal body size was larger in deeper (> 150 m) water, there was no difference in prey size by depth, suggesting impingement of the predators inhabiting deeper water into the shallow areas to cannibalize I year fish. The minimum ratio cannibal: prey size was 1(.)74. There was a positive but non-significant correlation between the contribution of cannibalism to a potenital predator's (> 300 nun) diet and an estimate of the previous year's recruitment. This was due to an extremely high contribution of cannibalism during 1992, when a distinctly larger size of predators seemed to bias the contribution. When the 1992 data were removed from the analysis, a significant correlation was obtained (r(2) = 0(.)77, P < 0(.)01), showing that pollock cannibalism is rather density dependent. Based on the results, it is hypothesized that the 'overflow' of 1 year fish from the shelf waters due to their high abundance and the weak stratification in the spring water column results in increased co-occurrence with adult fish and consequent cannibalism.
机译：食人鱼在日本北海道岛东海岸外的角膜白斑鳕中仅在春季（4月至6月）很重要，其重要性从<200 mm LS鱼干重的0％增至> 200 mm LS鱼的干重的48％。 400毫米Ls鱼。大部分猎物都以一年生鱼为代表，显示出单峰体型分布，其模式为121-130毫米。尽管在更深的水中（> 150 m）食人鱼的体型更大，但在深度上猎物的大小并没有差异，这表明居住在更深水域的捕食者会受到冲击，从而使一年生的鱼食化。食人鱼：猎物的最小比例为1（。）74。自相残杀对潜在掠食者（> 300尼姑）饮食的贡献与对上一年招募人数的估计之间存在正相关但不显着相关。这是由于1992年食人族的巨大贡献，当时掠食者的规模明显更大，似乎使这一贡献产生了偏差。当从分析中删除1992年的数据时，获得了显着的相关性（r（2）= 0（。）77，P <0（。）01），表明波洛克食人族与密度有关。根据这些结果，可以推测，由于架空水的丰度高和泉水柱中的分层较弱，导致一年的鱼类从架子水域“溢流”会导致与成鱼的共生增加，并导致自相残杀。

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