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- Title
长江口浮游植物群落特征及影响因素分析.
- Authors
邵海燕; 王卿; 高春霞; 赵静
- Abstract
In order to understand the composition and structural characteristics, spatiotemporal distribution pattern and key impact drivers of phytoplankton communities in the Yangtze River Estuary, the characteristics of phytoplankton communities and the relationship between the characteristics of phytoplankton communities and influencing factors were explored based on the survey data of phytoplankton in the Yangtze River Estuary in August (summer) and November (autumn) from 2018 to 2020 by community diversity analysis indicators and generalized additive model (GAM). The results showed that a total of 185 species of phytoplankton were collected in 8 phyla, 99 genera, with the dominant species mainly including Skeletonema costatum, Aulacoseira granulata, Melosira sulcata, Cyclotella sp. and Chlamydomonas sp., and the main phytoplankton groups including Bacillariophyta, Cyanophyta and Chlophyta, in which Skeletonema costatum had long been overwhelming. There were significantly higher abundance and species of phytoplankton in summer than those in autumn (P<0. 05). In autumn, however, phytoplankton communities showed higher diversity index and richness index and more evenly distributed. Spatially, the average phytoplankton abundance showed the distribution pattern of East Beach > South Branch > North Branch as a whole. The GAM analysis indicated that water temperature (Tem), pH and total nitrogen to total phosphorus ratio (TN/ TP) were the environmental factors (P< 0. 05) significantly affecting the abundance distribution of phytoplankton in the Yangtze River Estuary in summer, with the maximal contribution rate of 71. 86% from TN/ TP. Salinity (Sal), dissolved oxygen (DO) and chemical oxygen demand (CODMn ) were found to be the environmental factors (P<0. 05) significantly affecting the abundance distribution of phytoplankton in the Yangtze River Estuary in autumn, especially the DO contribution up to 48. 48%. The findings indicate that there are seasonal differences in the community composition, structure, pattern and influencing factors of phytoplankton in the Yangtze River Estuary, which provides references for understanding of the dynamics of phytoplankton resources in the Yangtze River Estuary.
- Publication
Journal of Dalian Ocean University, 2024, Vol 39, Issue 1, p124
- ISSN
2095-1388
- Publication type
Article
- DOI
10.16535/j.cnki.dlhyxb.2023-171