Spatial and seasonal shifts in bloom‐forming cyanobacteria in Lake Chaohu: Patterns and driving factors | doi.page

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Spatial and seasonal shifts in bloom‐forming cyanobacteria in Lake Chaohu: Patterns and driving factors

Phycological Research2015Vol. 64(1), pp. 44–55

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Min Zhang, Yuchao Zhang, Zhen Yang, Lijun Wei, Wenbin Yang, Chao Chen, Fanxiang Kong

Abstract

Summary The patterns of spatial and temporal shifts in bloom‐forming cyanobacteria and the driving factors for these patterns were determined by analyzing the distribution of these cyanobacteria in L ake C haohu using data from satellite images and field samples collected during 2012 and 2013. The cyanobacterial blooms primarily occupied the western region of L ake C haohu, and the direction and speed of the prevailing wind determined the spatial distribution of these blooms. The cyanobacteria in L ake C haohu were dominated by species of M icrocystis and A nabaena . M icrocystis reached its peak in J une, and Anabaena had peaks in M ay and N ovember, with an overall biomass that was higher than that of M icrocystis . M icrocystis generally occupied the western region of the lake in summer, whereas Anabaena dominated in other regions and seasons. Temperature may be responsible for these seasonal shifts. However, total phosphorus ( TP ), pH , temperature, turbidity and nitrate/nitrite nitrogen determined the coexistence of the two genera in different regions in summer. TP was correlated with M icrocystis dominance, and pH and light availability were correlated with A nabaena dominance. Our results contribute to the understanding of shifts in bloom‐forming cyanobacteria and are important for the control of cyanobacterial blooms.

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Abstract

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