Composition and diversity of stomach content of blue shark (<em>Prinace glauca</em>) in the central Atlantic Ocean

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Composition and diversity of stomach content of blue shark (Prinace glauca) in the central Atlantic Ocean
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                        GENG ZheGENG Zhe
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
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ZHU JiangfengZHU Jiangfeng
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
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CHEN YanCHEN Yan
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
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DAI XiaojieDAI Xiaojie
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
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WU FengWU Feng
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
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Affiliation:shang hai ocean university,shang hai ocean university,shang hai ocean university,shang hai ocean university,shang hai ocean university
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Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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Abstract:

Based on stomach content samples of blue shark Prionace glauca in the Atlantic Ocean(5°N-15°N,25°W-40°W)during October-February 2010 and October-March 2011, stomach content of blue shark was analyzed. The feeding intensity of blue shark was dominated by level one. The feeding intensities of juveniles and adults were significantly different (P<0.1); while the feeding intensities of females and males were not significantly different (P>0.1). Teleosts were the main preys, followed by cephalopods. Dominant prey species (category) of females was squid, sardine, Longnose lancetfish Alepisaurus ferox and tapertail ribbonfish Trachipterus fukuzakii, same as those of males. Overall, the proportion and frequency of cephalopods in stomach content tended to decrease with blue shark size; while those of teleosts tended to increase with blue shark size. The Shannon-Weiner diversity index (H) of prey item was 1.7, and the Simpson diversity index (C) of prey item was 0.23. The index H increased with blue shark size, and the index C showed a contrary trend.

Key words:Prionace glauca;stomach content;feeding;Atlantic Ocean

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耿喆,朱江峰,陈彦,戴小杰,吴峰.中部大西洋大青鲨胃含物组成及其多样性研究[J].上海海洋大学学报,2015,24(1):108-114.
GENG Zhe, ZHU Jiangfeng, CHEN Yan, DAI Xiaojie, WU Feng. Composition and diversity of stomach content of blue shark (Prinace glauca) in the central Atlantic Ocean[J]. Journal of Shanghai Ocean University,2015,24(1):108-114.

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Received:September 01,2014
Revised:October 20,2014
Adopted:November 05,2014
Online: January 30,2015
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