Seasonal changes in fish diversity, density, biomass, and assemblage alongside environmental variables in the Yangtze River Estuary
Seasonal changes in fish diversity, density, biomass, and assemblage alongside environmental variables in the Yangtze River Estuary
复制标题
DOI：
10.1007/s11356-020-08674-8
复制
发表时间：
2020-04
影响因子：
5.8
通讯作者：
R. Kindong;Jianhui Wu;Chun-xia Gao;Libin Dai;Siquan Tian;X. Dai;Jinhui Chen
中科院分区：
文献类型：
--
作者：
R. Kindong;Jianhui Wu;Chun-xia Gao;Libin Dai;Siquan Tian;X. Dai;Jinhui Chen
采用多元统计方法对长江口鱼类物种多样性和分布格局进行了分析，以确定环境参数对长江口鱼类群落结构和组成的影响。这项分析使用了2012年2月至2014年12月在年鉴中获得的数据。对渔获量数据的分析表明，物种组成、总密度和总生物量在站点和季节之间存在显著差异。共采集到植物38种，隶属于18科。捕获科为优势科，占捕获标本总数的40.8%。从大到小依次为Collichthys Lucidus、Cynoglossus gracilis、Chaeturichthys isticantias和Lophiogobius ocellicacadomomomomomomomomomomomomomed in Yre。这4种鱼占总渔获量的64.2%，站间差异平均为74.19%，月间差异平均为81.3%。捕获的鱼类样本数量最多是在2012年8月，物种丰富度最高是在2013年12月。年平均鱼密度为0.35尾/平方米，生物量为2.5微克/平方米。最重要和最占优势的物种的平均密度和生物量在站点和季节之间变化显著。典型对应分析表明，盐度和叶绿素a是构成该区域鱼类群落结构的关键变量。研究区高盐度站(北支)的物种密度和生物量均较高。这项研究证实，在Yre捕获的大多数物种需要河口条件来完成它们的生长和发育。因此，这项研究的发现对于了解和制定适当的养护计划以管理青藏高原的鱼类资源是重要的。
The present study used multivariate techniques, to analyze the fish species diversity and distribution patterns in order to determine the possible role of environmental parameters as drivers of fish community structure and composition in the Yangtze River Estuary (YRE). This analysis was conducted using data obtained in the YRE from February 2012 to December 2014. Analysis of the catch data showed that species composition, total density, and total biomass varied significantly between stations and seasons. Thirty-eight species belonging to 18 families were collected. Sciaenidae was the most dominant family accounting for 40.8% of total captured specimens. In descending order,Collichthys lucidus,Cynoglossus gracilis,Chaeturichthys stigmatias, andLophiogobius ocellicaudadominated catches in the YRE. These four species constituted 64.2% of the total catches and showed average dissimilarities of 74.19% between stations and 81.3% between months. The highest number of fish specimens captured was recorded in August 2012 while the highest species richness was observed in December 2013. The mean fish density and biomass for the YRE was 0.35 individuals/m2and 2.5 g/m2, respectively. The mean density and biomass for the most important and dominant species changed significantly between stations and seasons. Canonical correspondence analysis indicated that salinity and chlorophyll-a were the key variables that structured the fish assemblage in the YRE. High total species density and biomass were recorded in high saline stations (North Branch) of the YRE. This study confirms that most species captured in the YRE needs estuarine conditions to complete their growth and development. Hence, the findings in this study are important to understanding and developing suitable conservation plans for the management of fish resources in the YRE.