东太平洋公海大青鲨的胃含物组成研究
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- 英文论文题名：Composition of stomach content of blue shark(Prinace glauca) in the high sea water of eastern Pacific Ocean
- 论文作者：耿喆 ; 朱江峰 ; 戴小杰
- 英文论文作者：GENG Zhe ; ZHU Jiangfeng ; DAI Xiaojie ; Key Lab.of Sustainable Exploitation of Oceanic Fisheries Resources ; Ministry of Education ; College of Marine Sciences ; Shanghai Ocean University
- 年：2016
- 作者机构：上海海洋大学海洋科学学院大洋渔业资源可持续开发省部共建教育部重点实验室;
- 论文关键词：大青鲨 ; 胃含物 ; 摄食 ; 延绳钓 ; 太平洋
- 英文论文关键词：Prionace glauca ; Stomach content ; Feeding ; Longline ; Pacific Ocean
- 会议召开时间：2016-11-02
- 会议录名称：2016年中国水产学会学术年会论文摘要集
- 语种：中文
- 分类号：S917.4
- 学会代码：OGSB
- 会议名称：2016年中国水产学会学术年会
- 会议地点：中国四川成都
- 主办单位：中国水产学会、四川省水产学会
- 学会名称：中国水产学会
- 页数：1
- 文件大小：566k
- 原文格式：D
- 会议级别：全国
摘要
鱼类摄食研究已经可以借助稳定同位素分析等微观技术开展,但胃含物饵料组成分析仍是鱼类摄食生态的基础性工作。文章根据2011年10月-2013年12月期间海上采集的样品,首次对东太平洋公海海域(25°S~15°N,175°E~105°W)的大青鲨(Prinace glauca)胃含物组成及其多样性进行探究。结果表明,摄食强度以1级为主(68%),雌性与雄性间摄食强度组成无显著差异(χ~2,P>0.1)。胃含物种类组成结构上,硬骨鱼类占最大比例(占57.3%),其次是头足类(其中鱿鱼占总饵料数的97.9%),雌、雄间无显著差异(χ~2检验,P>0.05),但个体间饵料组成差异大,重叠率低。饵料总体多样性Shannon-Weiner指数H=1.78,Simpson指数C=0.28。随大青鲨叉长增加,H略呈下降趋势,C略呈上升趋势。成熟中、排卵中、已怀孕三个阶段的雌性个体饵料组成多样性略有差异。聚类分析显示,1-3月、8-10月和11-12月的饵料组成结构中,后两者的相似性较高。
Although microscopic techniques such as stable isotope analysis have been frequently applied in fish feeding studies, stomach content analysis always plays a fundamental role in feeding ecology. Based on sampling at sea in the tropical water of the eastern Pacific Ocean(25°S~15°N,175°E~105°W) between October 2011 and December 2013, stomach content and prey diversity of blue shark(Prionace glauca) was analyzed. The feeding intensity of blue shark was dominated by level one(68%). The feeding intensity compositions between females and males were not significantly different( χ~2-test, P>0.1). Teleosts were the major prey items(57.3%),followed by cephalopods(with 97.9% item of squid). The diet composition was not significantly different between genders, but significantly different among individuals. The Shannon-Weiner diversity index(H) and Simpson diversity index(C) for prey items was 1.78 and 0.28, respectively.The index H decreased with blue shark size, while the index C increased. The prey diversity indices for female blue sharks in maturing, ovulating, and gravid stages were slightly different.Cluster analysis showed that the diet composition in August-October and November-December were more similar than that in January-March.
Although microscopic techniques such as stable isotope analysis have been frequently applied in fish feeding studies, stomach content analysis always plays a fundamental role in feeding ecology. Based on sampling at sea in the tropical water of the eastern Pacific Ocean(25°S~15°N,175°E~105°W) between October 2011 and December 2013, stomach content and prey diversity of blue shark(Prionace glauca) was analyzed. The feeding intensity of blue shark was dominated by level one(68%). The feeding intensity compositions between females and males were not significantly different( χ~2-test, P>0.1). Teleosts were the major prey items(57.3%),followed by cephalopods(with 97.9% item of squid). The diet composition was not significantly different between genders, but significantly different among individuals. The Shannon-Weiner diversity index(H) and Simpson diversity index(C) for prey items was 1.78 and 0.28, respectively.The index H decreased with blue shark size, while the index C increased. The prey diversity indices for female blue sharks in maturing, ovulating, and gravid stages were slightly different.Cluster analysis showed that the diet composition in August-October and November-December were more similar than that in January-March.
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