Fig. 4: Overall change in microbial community composition per year.
The left panel shows the delta OTU (disappearance or detection of a novel OTU from between two consecutive years) for dominant bacterial and archaeal groups in >3 and 3−0.2 µm pore-size filters combined. The right panel shows the Bray–Curtis dissimilarity rate of the bacterial and archaeal community over time. For dissimilarity rate analyses, only samples collected in the upper water layer and during the same season (October, November and December) were included. Each gray dots indicates Bray–Curtis similarity values calculated from pairwise comparisons between 2015 samples and subsequent years and average values are represented by black horizontal lines. Green line represents the average dissimilarity rate between community composition identified from 2015 to 2022 with the coefficient of the line Dt indicating the Bray–Curtis dissimilarity rate per year. The red line represents the changes of the dissimilarity rate between 2015 community composition and all subsequent years. Dashed gray lines represent theoretical resistance/stability and resilience patterns.
