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Demersal fish predators of gelatinous zooplankton in the Northeast Pacific Ocean
Marine Ecology Progress Series ( IF 2.5 ) Pub Date : 2021-01-21 , DOI: 10.3354/meps13489
RD Brodeur 1 , TW Buckley 2 , GM Lang 2 , DL Draper 1 , JC Buchanan 1 , RE Hibpshman 3
Affiliation  

ABSTRACT: Historically, gelatinous zooplankton have been considered important consumers or predators in marine food webs, but more recently they have also been recognized as important prey for many marine species. Here, we summarized data obtained from >100 Northeast Pacific fish predators based on extensive gut content analysis (~450000 stomachs examined) from broad-scale demersal trawl surveys ranging from the Bering Sea to Southern California. In the Bering Sea, we identified 27 predators on jellyfish and 23 on urochordates. In the Aleutian Islands, 14 and 18 predators were identified, respectively, and for the Gulf of Alaska, a total of 23 and 32 such predators were documented. Off the West Coast of the contiguous USA, we identified 16 coelenterate predators and 7 urochordate predators. Many of these predators were not previously known to prey on gelatinous zooplankton. Dominant consumers of coelenterates include prowfish, rockfishes, walleye pollock, sablefish, and grenadiers, and primary consumers of urochordates included rockfishes, Atka mackerel, and sablefish. Pronounced seasonal and interannual variability in gelatinous taxa occurrence was observed in several dominant fish predators. The occurrence of jellyfish prey was generally much higher in diets of fishes examined fresh at sea when compared with diets of the same species examined in the laboratory following preservation. Differences in occurrence were less pronounced with the more durable urochordate prey. We suggest that many existing estimates of predation on easily dissolved gelatinous prey may underestimate the true predation rate and the importance of these organisms in marine food webs.

中文翻译:

东北太平洋胶质浮游动物的底栖鱼类捕食者

摘要:从历史上看,胶质浮游动物被认为是海洋食物网中的重要消费者或捕食者,但最近它们也被公认为许多海洋物种的重要猎物。在这里,我们根据广泛的肠道内容分析(从白令海到南加州)的广泛肠道含量分析(检查了约45万个胃),总结了从> 100个东北太平洋鱼类捕食者获得的数据。在白令海,我们在水母上发现了27种捕食者,在下肢动物上发现了23种。在阿留申群岛上,分别确定了14和18个捕食者,对于阿拉斯加湾,总共记录了23和32个此类捕食者。在美国西海岸附近,我们确定了16个腔肠食肉动物和7个Urochordate食肉动物。这些捕食者中有许多以前不知道会捕食胶状浮游动物。腔肠动物的主要消费者包括pro鱼,石鱼,角膜白鳕,黑貂和手榴弹,而urochordates的主要消费者包括石鱼,阿特卡鲭鱼和黑貂。在几个主要的鱼类捕食者中观察到明显的季节变化和年际变化。与保存后在实验室检查的相同物种的饮食相比,在海上新鲜检查的鱼类的饮食中水母猎物的发生率通常高得多。urochordate猎物更加持久,猎物的发生差异不那么明显。
更新日期:2021-01-21
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