Invertebrate assemblage structure associated with key environmental factors in the Yangtze River Estuary, China.

doi:10.13287/j.1001-9332.201809.036

Abstract

Abstract: Yangtze River Estuary plays a key role in linking the river and ocean ecosystems. Our understanding on its biodiversity and associated ecological processes remains poor, which is especially true for the invertebrate assemblage. Here, we investigated invertebrate assemblage pattern and associated environmental drivers based on four different seasonal comprehensive investigations across this region in 2014. A total of 35 species, belonging to 20 families, 10 orders and three phylums were identified. Crustaceans (19 species) and mollusks (13 species) were the taxa with higher richness. Dominant invertebrate included Palaemon gravieri, Crangon affinis, Ovalipes punctatus, Acetes chinensis, Portunus trituberculatus and Charybdis bimaculata. Total density and biomass was 4518.96 kN·km^-2and 173.09 kg·km^-2 respectively, with the highest value in spring and the lowest in autumn. Biodiversity indices peaked in winter and spring and reached the lowest in summer. Invertebrate assemblage structure showed significant seasonal variation, appearing in a significant difference between the near-shore and the off-shore in spring, and between the northern-waters and southern-waters in other seasons. Results from ordination analysis showed that the spatial variation of invertebrate was mainly regulated by temperature and dissolved oxygen, whereas Chla and nutrient factors played key roles in driving the temporal community assemblage in this region.

REN Qing-qiang, XIAN Wei-wei, ZHANG Yan, LIU Chun-long, LI Wen-long. Invertebrate assemblage structure associated with key environmental factors in the Yangtze River Estuary, China.[J]. Chinese Journal of Applied Ecology, 2018, 29(9): 3067-3077.

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