An abrupt regime shift of bacterioplankton community from weak to strong thermal pollution in a subtropical bay.

Alpha diversity patterns of bacterioplankton according to the three states in regime shift ASV richness index, Shannon index, Simpson index, Pielou index, Chao1 index, and ACE index all exhibited a highly significant negative correlations with temperature (Spearman correlations: R = −0.546, p < 0.01 for ASV richness index; R = −0.674, p < 0.01 for Shannon index; R = −0.696, p < 0.01 for Simpson index; R = −0.709, p < 0.01 for Pielou index; R = −0.552, p < 0.01 for Chao1 index; R = −0.550, p < 0.01 for ACE index) ( Table 1 ).

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This suggested a decreasing trend in alpha diversity with increasing seawater temperature. 3.3.

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