摘要
确定河流鱼类群落的时空分布格局及其形成机制是开展鱼类物种多样性保护与管理的科学基础.基于2013年10月和2014年5月共2次对太湖流域57个河道样点的调查数据,初步研究太湖流域河流鱼类群落结构及其多样性的季节动态和空间分布特点.共采集鱼类5051尾,计46种,其中鲤科鱼类26种,占全部物种数的57%.10月份的鱼类多样性显著高于5月份,且2个季度的鱼类群落结构存在显著性差异.5个主要水系间的鱼类多样性差异显著,总体上,沿江水系和洮滆水系鱼类多样性较低,黄浦江水系居中,而南河水系和苕溪水系较高;鱼类群落结构也随水系而显著变化,主要表现为黄浦江水系与洮滆、苕溪和沿江水系呈显著差异.在2个一级生态分区之间,鱼类多样性无显著差异但群落结构显著不同,主要因、鲫、似鳊等优势种及宽鳍鱲、尖头鱥、中华青鳉、食蚊鱼等偶见种的空间分布差异所引起;在4个二级生态分区之间,鱼类多样性和群落结构均存在显著的空间变化.
Identifying the distribution of species composition and their abundance of fishes is basic for the conservation and management of fish diversity. Based on the data collected from 57 stream segments within the Taihu Lake Basin during October 2013 and May 2014, we examined how the stream fish assemblages vary spatially and seasonally in this study area. A total of 5051 individuals representing 46 species were collected, among which Cyprinidae fishes are amounted to 26 species. Fish diversity in October was significantly higher than that in May, and fish assemblage structures also significantly differed seasonally. Significant variations among different subbasins were observed for both fish species diversity and assemblage structures. The Yanjiang and Zhaoge subbasins had relatively lower species diversity, while those in the Nanhe and Tiaoxi subbasins were relatively higher. Assemblage structures in the Huangpujiang subbasin showed significantly difference from those in the Zhaoge, Tiaoxi and Yanjiang subbasins. When the spatial variations in fish assemblages among ecoregions were considered, fish assemblage structures, not species diversity, showed significantly variation between two ecoregions at level-1; while both assemblage structures and species diversity differed significantly among four ecoregions at level-2.This among-ecoregion variations in assemblage structures resulted from the spatial distribution of some dominant fishes, such as Hemiculter leucisculus, Carassius auratus and Pseudobrama simoni, and some rare fishes, such as Zacco platypus, Phoxinus oxycephalus, Oryzias latipes sinensis and Gambusia affinis. © 2016 by Journal of Lake Sciences.
作者
李其芳
严云志
储玲
朱仁
高俊峰
高永年
LI Qifang;YAN Yunzhi;CHU Ling;ZHU Ren;GAO Junfeng;GAO Yongnian(Provincial Key Laboratory o f Biotic Environmental and Ecological Safely, College o f Life Sciences, Anhui Normal University,Wuhu 241000,P.R.C hina;Nanjing Institute o f Geography and Limnology , Chinese Academy o f Sciences, Nanjing 210008, P.R.China)
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2016年第6期1371-1380,共10页
Journal of Lake Sciences
基金
国家水体污染控制与治理科技重大专项(2012ZX07501-001-03)
国家自然科学基金项目(31172120)联合资助
