Half-century trends in alpha and beta diversity of phytoplankton summer communities in the Helsinki Archipelago, the Baltic Sea.

ABSTRACT: We analyzed phytoplankton biodiversity trends in a 52 year (1967-2018) monitoring time-series from the archipelago of Helsinki, Gulf of Finland, the Baltic Sea. The community ordination revealed strong ordering of samples along the time axis (generalized additive model-gam fit: R ² = 0.9). Species richness increased in time and was the most influential alpha diversity descriptor related to the community structure (gam fit: R ² = 0.56-0.70). Changes in species richness accounted for 35-36% of the mean between-sample beta diversity. The remaining 64-65% was due to species turnover-the dominant component of the biodiversity trend. The temporal beta diversity trend reflected the eutrophication history of the geographically confined region, with a turning poi

SUBMITTER: Olli K 

PROVIDER: S-EPMC9897023 | biostudies-literature | 2023 Jan-Feb

REPOSITORIES: biostudies-literature