Demersal fish assemblage characteristics and their relationship with environmental variables in the sea off Changjiang River Estuary [春季长江口外海底层鱼类群聚特征及其与环境因子的关系]

作者：Xu Y.; Ma L.; Li X.-Z.^*; Sun Y.; Gong L.

来源：海洋与湖沼, 2017, 48(6): 1383-1391.

DOI：10.11693/hyhz20170700182

• Changjiang (Yangtze) River estuary
• Community structure
• Demersal fish
• Environmental variables

To understand the characteristics of the demersal fish assemblage and its relationship with environmental variables in the sea off Changjiang (Yangtze) River estuary, demersal fish samples were collected in May, 2015, and data were analyzed using statistical methods including Cluster analysis, Non-metric Multi-dimensional Scaling (NMDS), ANOSIM, SIMPER, and Canonical Correspondence Analysis (CCA). Totally 58 demersal fish species were identified, of which Perciformes (21 species) was most diverse, followed by Pleuronectiformes. Amblychaeturichthys hexanema was the most dominant species. Three demersal fish assemblages were identified: Inshore group, Southern-middle group, and Southern-offshore group. Most of the species in Southern-middle group and Southern-offshore group were pelagic species in the East China Sea, which is perhaps because of the influence of the Near-shore Kuroshio Bottom Branch. The number of species, Margalef richness, Shannon-Wiener diversity and Pielou evenness show an increasing trend from inshore to offshore. The result indicates that depth was the most significant environmental variables affecting the demersal fish assemblage. Pelagic species such as Champsodon snyderi, Repomucenus virgis, and Coelorinchus multispinulosus were positively correlated to depth. Dominant species Amblychaeturichthys hexanema was influenced relatively less by environment variables measured.

• 单位
  中国科学院大学