| 摘要: |
| 柔鱼亚科（Ommastrephinae）近缘种鸢乌贼（Sthenoteuthis oualaniensis）和茎柔鱼（Dosidicus gigas）为重要的大洋性经济头足类，二者在东太平洋赤道海域均有分布。研究以同一航次捕获的两种头足类为研究对象，结合传统胃含物分析和DNA条形码技术对二者食物组成及其差异开展研究，以分析同域近缘头足类间的摄食习性及差异。结果表明，鸢乌贼和茎柔鱼均以鱼类、头足类和甲壳类为主要食物来源，ANOVA显示，两者在Shannon多样性指数和饵料生物头足类和鱼类N%上均存在显著差异，SIMPER分析进一步表明，种间胃含物组成差异最主要体现在鱼类的种类组成和个数百分比上。研究结论直观反映了同域近缘头足类物种食物特化的现象，为后续探究头足类近缘种共存机制提供了数据支持。 |
| 关键词: 鸢乌贼 茎柔鱼 摄食习性 胃含物 DNA条形码 |
| DOI：10.11693/hyhz20210300062 |
| 分类号: |
| 基金项目:国家自然科学基金项目，31872573号，31900333号；上海市自然科学基金项目，17ZR1413000号；青岛海洋科学与技术试点国家实验室海洋渔业科学与食物产出过程功能实验室开放课题，2017-1A03号；农业农村部远洋与极地渔业创新重点实验室开放课题，2019-3号。 |
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| COMPARATIVE STUDY ON THE FEEDING HABITS OF STHENOTEUTHIS OUALANIENSIS AND DOSIDICUS GIGAS IN THE EASTERN EQUATORIAL PACIFIC OCEAN |
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LI Yun-Kai1,2,3, FENG Dan1, GAO Xiao-Di1, CHEN Xin-Jun1, GONG Yi1
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1.College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;2.Key Laboratory of Oceanic and Polar Fisheries, Ministry of Agriculture and Rural Affairs of Chinese Academy of Fishery Sciences, Shanghai 200009, China;3.Laboratory for Marine Fisheries Science and Food Production Processes, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China
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| Abstract: |
| Closely related cephalopods Sthenoteuthis oualaniensis and Dosidicus gigas have important economic values, and they have sympatric distribution in tropical eastern Pacific. We evaluated the interspecific food compositions by using a combination of visual evaluation and DNA barcoding of stomach contents to investigate the feeding habits and differences of these two squid species. Results show that fishes, cephalopods, and crustaceans were the main food sources for S. oualaniensis and D. gigas. In addition, as shown by ANOVA, there are significant differences between the Shannon diversity index and the N% (percentage of individuals) and W% (the percentage of food mass) of crustaceans and the N% of fish. Moreover, SIMPER (similarity percentages breakdown) analysis revealed that the differences of stomach contents among species are mainly reflected in the species composition and percentage individuals of fish. The research conclusions intuitively reflect the phenomenon of food specialization of similar cephalopods in the same domain, and provide data support for the subsequent exploration of the coexistence mechanism of cephalopods. |
| Key words: Sthenoteuthis oualaniensis Dosidicus gigas feeding habits stomach content DNA barcoding |
