Invasive Species Compendium

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Abstract

Phytoplankton community in Donggang red-tide-monitoring area, Yalujiang River Estuary.

Abstract

The phytoplankton community in Donggang red-tide-monitoring area in Yalujiang River estuary was studied using data collected from 2011 to 2015. A correlation analysis of the data with the environmental factors revealed that 136 species were identified in this research, belonging to 3 phyla with 53 genera, including 40 genera and 107 species in Bacillariophyta, 11 genera and 27 species in Pyrrophyta, and 2 genera and 2 species in Chrysophyta. The seasonal dominant species were red-tide algae, including Pseudonitzschia pungens, Chaetoceros debilis, Skeletonema costatum, and Leptocylindrus danicus. Cell density peaks were observed in spring and fall with the correlation between the density and water temperature of -0.696 (P<0.01). Compared with summer and fall, phytoplankton community structure was likely less stable in spring, and the single dominant species tended to appear with high density and dominance. It is concluded that spring and early summer are the HABs-prone seasons in Donggang red-tide-monitoring area. Warm water and rare species were found at times as dominant species in recent years, indicating that alien species invasion or certain changes in marine environment may have happened in the survey area.