Fish assemblage structure in the hypoxic zone in the Changjiang (Yangtze River) estuary and its adjacent waters

被引:16
|
作者
Shan Xiujuan [1 ]
Jin Xianshi [1 ]
Yuan Wei [1 ]
机构
[1] Chinese Acad Fishery Sci, Key Lab Sustainable Utilizat Marine Fisheries Res, Key Lab Fishery Resources & Ecoenvironm, Minist Agr,Yellow Sea Fisheries Res Inst, Qingdao 266071, Peoples R China
来源
CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY | 2010年 / 28卷 / 03期
基金
中国国家自然科学基金;
关键词
the Changjiang estuary; fish assemblage structure; diversity; size spectrum; COMMUNITY STRUCTURE; YELLOW SEA; NORTH-SEA; DIVERSITY; SIZE; SPECTRA; TOOL;
D O I
10.1007/s00343-010-9102-6
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Fish assemblage structure in the hypoxic zone in the Changjiang (Yangtze River) estuary and its adjacent waters were analyzed based on data from bottom trawl surveys conducted on the R/V Beidou in June, August and October 2006. Four fish assemblages were identified in each survey using two-way indicator species analysis (TWIA). High fish biomass was found in the northern part, central part and coastal waters of the survey area; in contrast, high fish diversity was found in the southern part of the survey area and the Changjiang estuary outer waters. Therefore, it is difficult to maintain high fishery production when high fish diversity is evenly distributed in the fish community. Fish became smaller and fish size spectra tended to be narrower because of fish species variations and differences in growth characteristics. Fish diversity increased, the age to maturity was reduced and some migrant species were not collected in the surveys. Fish with low economic value, small size, simple age structure and low tropic level were predominant in fish assemblages in the Changjiang estuary and its adjacent waters. The lowest hypoxic value decreased in the Changjiang estuary and its adjacent waters.
引用
收藏
页码:459 / 469
页数:11
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