title: [Ecological niche breadth and niche overlap of dominant species of fish assemblage in Yangtze river estuary and its adjacent waters].
abstract: Based on the fishery resources data from the bottom trawl surveys conducted on the R/V Beidou in the Yangtze River estuary and its adjacent waters in June, August and October of 2006, the index of relative importance (IRI) was measured to determine the dominant species of fish assemblage, and the niche indicators and their seasonal variations of the dominant species were analyzed. A total of 10 dominant species in the 3 survey cruises were recorded, which were divided into two groups by the Bray-curtis similarity clustering and non-metric multidimensional scaling (MDS) analysis, with a significant seasonal variation of niche breadth and niche overlap. One group included Engraulis japonicus, Champsodon capensis, and Acropoma japonicum, whose niche breadth and niche overlap were larger in summer than in autumn, with a migration from the Yangtze River estuary and its adjacent waters to outer deeper waters, while the other group included Trichiurus haumela, Chaeturichthys stigmatias, Apogon lineatus, Larimichthys polyactis, Psenopsis anomala, Argyrosomus argentatus, and Benthosema pterotum, whose niche breadth and niche overlap were larger in autumn than in summer, with a reverse migration from southern Yellow Sea and northern East China Sea to the Yangtze River estuary and its adjacent waters. The different migration direction of the two groups was related to their ecological habits and environmental factors.
authors.affiliation: Ministry of Agriculture Key Laboratory of Sustainable Development of Marine Fisheries/Shandong Province Key Laboratory for Fishery Resources and Eco-environment, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, Shandong, China. lixs@ysfri.ac.cn
authors.forename: Xian-sen
authors.initials: XS
authors.lastname: Li
authors.affiliation: Fresh Water Fishery Research Institute of Shandong Province, Ji' nan 250013, China.
authors.forename: Zhen-hai
authors.initials: ZH
authors.lastname: Yu
authors.affiliation: Ministry of Agriculture Key Laboratory of Sustainable Development of Marine Fisheries/Shandong Province Key Laboratory for Fishery Resources and Eco-environment, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, Shandong, China.
authors.forename: Shan
authors.initials: S
authors.lastname: Sun
authors.affiliation: Ministry of Agriculture Key Laboratory of Sustainable Development of Marine Fisheries/Shandong Province Key Laboratory for Fishery Resources and Eco-environment, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, Shandong, China.
authors.forename: Xian-shi
authors.initials: XS
authors.lastname: Jin
mesh_terms: D000818:Animals; D002681:China; D017753:Ecosystem; D063366:Estuaries; D005399:Fishes / Q000145:classification* / Q000254:growth & development*; D009792:Oceans and Seas; D011157:Population Dynamics; D045483:Rivers; D012621:Seasons