FEEDING HABITS OF THE COMMON THRESHER SHARK (ALOPIAS VULPINUS) SAMPLED FROM THE CALIFORNIA-BASED DRIFT GILL NET FISHERY, 1998-1 999
FEEDING HABITS OF THE COMMON THRESHER SHARK (ALOPIAS VULPINUS) SAMPLED FROM THE CALIFORNIA-BASED DRIFT GILL NET FISHERY, 1998-1 999
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长尾鲨 (ALOPIAS VULPINUS) 的摄食习性，取自加利福尼亚州流刺网渔业样本，1998-1999 年
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
D. Ramon
中科院分区：
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作者：
Antonella Preti;Susan E. Smith;D. Ramon
美国长尾鲨的食性。太平洋沿岸沃茨进行了调查的发生频率，重力和数值方法，并计算的几何指数的重要性（GII）的猎物类群从石首鱼收集的渔业观察员从加利福尼亚州的流刺网渔业。采样时间为1998年8月16日至1999年1月24日，当时加州洋流正经历从厄尔尼诺到拉尼娜的快速变化。在165胃检查，107个包含的食物代表了总共20个类群，揭示了更广泛的营养谱比以前报道的这个物种。在可识别的项目中，北方鳀鱼（Engraulis mordax）是最重要的食物（GI 1 = 48.2），其次是太平洋无须鳕（Merluccius productus; GI 1 = 31.2），太平洋鲭鱼（Scomber pigeon; GI 1 = 24.8）和太平洋沙丁鱼（Savdinops sagax; GI 1 = 9.2）。在无脊椎动物中，鱿鱼（乌贼总科，包括乳光枪乌贼; GI 1 = 6.3）和远洋红蟹（平足侧耳; GI 1 = 6.6）也很重要，特别是在数量上。对于鲨鱼收集北纬34%，鳕鱼是最重要的可识别的物种在饮食中，北方是最重要的在南方，但没有确定在胃收集点概念以北。
The diet of common thresher shark (Alopius vulpinus) from US. Pacific Coast waters was investigated by means of frequency of occurrence, gravimetric and numerical methods, and calculating the geometric index of importance (GII) of prey taxa taken from stoniachs collected by fishery observers from the California-based drift gill net fishery. Sampling was done from 16 August 1998 to 24 January 1999, a time when the California Current was undergoing rapid change from El Niiio to La Niiia conhtions. Of the 165 stomachs examined, 107 contained food representing a total of 20 taxa, revealing a broader trophic spectrum than previously reported for this species. Of the identifiable items, northern anchovy (Engraulis mordax) was the most important in the diet (GI1 = 48.2), followed by Pacific hake (Merluccius productus; GI1 = 31.2), Pacific mackerel (Scomber japonicus; GI1 = 24.8), and Pacific sardine (Savdinops sagax; GI1 = 9.2). Of the invertebrates, squid (Teuthoidea, including Loligo opalescenr; GI1 = 6.3), and pelagic red crab (Pleuroncodes planipes; GI1 = 6.6), were also important, especially numerically. For sharks collected north of 34% latitude, hake was the most important identifiable species in the diet; northern anchovy was most important in the south, but was not identified in stomachs collected north of Point Conception.