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首页> 外文期刊>Fisheries Research >Feeding habits of the Atlantic bonito, Sarda sarda (Bloch, 1793) inthe southern Tyrrhenian sea
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Feeding habits of the Atlantic bonito, Sarda sarda (Bloch, 1793) inthe southern Tyrrhenian sea

机译：大西洋鱼，第勒尼安海南部的Sarda sarda（布洛赫，1793年）的摄食习性

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摘要

The feeding habits of the Atlantic bonito Sarda sarda (Bloch, 1793) caught in the southern Tyrrhenian sea were studied. The specimens were collected by means of a surface gillnet on a monthly basis between March and December 2003. The importance of the different prey items was assessed utilizing several feeding indexes, while possible size-related and temporal variations of the diet composition were tested by means of DISTLM forward and NMDS analysis. Intact prey items were measured in order to determine predator-prey relationships. The results of this study showed that S. sarda is a piscivorous predator focusing on clupeiforms and more in detail on three species such as the round sardinella Sardinella aurita, the sardine Sardina pilchardus and the anchovy Engraulis encrasicolus. Other prey were recorded occasionally. No temporal significant variations in the diet composition were found. On the other hand, a variation in the diet of the Atlantic bonito was observed according to its length. The smaller specimens fed primarily on E. encrasicolus. As they grew, S. pilchardus and S. aurita became important prey species, with the latter becoming by far the predominant prey for the largest Atlantic bonitos. Finally, a significant and positive correlation between predator and prey length was found.
机译：研究了在第勒尼安海南部捕获的大西洋鱼Sarda sarda（Bloch，1793）的摄食习性。在2003年3月至2003年12月之间，每月通过表面刺网收集标本。利用几种喂养指数评估了不同猎物的重要性，同时通过多种手段测试了日粮组成可能与大小有关和随时间变化DISTLM转发和NMDS分析。测量完整的猎物，以确定食肉动物与猎物的关系。这项研究的结果表明，S。sarda是一种食鱼性捕食者，主要捕食卵形目，更详细地介绍了三个种类，如圆形沙丁鱼Sardinella aurita，沙丁鱼Sardina pilchardus和cho鱼Engraulis encrasicolus。偶尔记录其他猎物。没有发现饮食组成随时间的显着变化。另一方面，观察到大西洋鱼的饮食根据其长度而变化。较小的标本主要以大肠杆菌（E. encrasicolus）为食。随着它们的生长，S。pilchardus和S. aurita成为重要的猎物种类，后者成为迄今为止最大的大西洋鱼的主要猎物。最后，发现捕食者与猎物长度之间存在显着正相关。

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