Temporal variation in the composition and abundance of fish larvae and juveniles off the Yangtze River Estuary in spring and summer

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 春夏季长江口邻近水域仔稚鱼种类组成和丰度的月变化 DOI: 作者: 作者单位: 中国水产科学研究院东海水产研究所, 农业部东海渔业资源开发与利用重点实验室, 上海 200090 作者简介: 李建生(1976-),副研究员,从事渔业资源与生态学研究.E-mail:jianshengli@sina.com 通讯作者: 中图分类号: S931 基金项目: 国家公益性行业（农业）科研专项经费项目（201303047）. Temporal variation in the composition and abundance of fish larvae and juveniles off the Yangtze River Estuary in spring and summer Author: Affiliation: East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences;Key Laboratory of East China Sea Fishery Resources Exploitation, Ministry of Agriculture, Shanghai 200090, China Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:利用2015年4—7月在长江口邻近水域的调查数据，对春夏季该水域仔稚鱼种类组成和丰度的月变化特征进行了观测。结果表明，共采获62种、35839尾仔稚鱼，分别属于14目、30科、45属。各月种类数范围为22~36种，从4月到6月，先是缓慢增加然后快速增加，至6月达到高峰期，7月则大幅降低。各月的丰度范围为11.45~114.31 ind/（100 m3）；丰度随时间的推移而持续增加。各月主要种类数范围为5~13种，具有较大的波动性；优势种主要为小黄鱼（Chaeturichthys hexanema）、鳀（Acanthogobius ommaturus）、（鱼衔）属（ sp.）等。优势种随时间推移表现出较大的更替性。种类数以20 m以浅水域最多，不同水深范围的月变化有一定的差异性。20 m以浅海域的种类数与表层水温的关系在4—6月为显著正相关（=-0.91，<0.05）。从春季到夏季，仔稚鱼高丰度区从浅水区向深水区转移。 Abstract:The present study investigated the monthly variation in species composition and abundance of fish larvae and juveniles from April to July 2015 off the Yangtze River Estuary. A total of 35839 larvae and juveniles were collected, and these included 62 species from 45 genera, 30 families, and 14 orders. Species richness ranged from 22 to 36, depending on month, increased from April to June, and then declined sharply in July. Meanwhile, the total abundance of larvae and juveniles ranged from 11.45 to 114.31 individuals per 100 m3 and increased throughout the study period, with small increases during the first three months and a greater increase in July. The number of dominant species varied by month, ranging from 5 to 13, and the dominant species mainly included Chaeturichthys hexanema, Engraulis japonicus, Odontamblyopus rubicundus, Acanthogobius ommaturus, and sp.. The dominant species showed greater replacement over time. The greatest species richness was observed in the nearshore water (<20 m depth), and the spatial pattern of species richness along the depth gradient varied among months. Surface temperature and species richness were positively correlated (<0.05) from April to June but negatively correlated from June to July, and in every month, abundance and surface salinity were negatively correlated (<0.05) in the nearshore water (<20 m depth). The high-abundance region shifted away from the shore over time. 参考文献 相似文献 引证文献