Abstract
Functional traits are becoming more common in the analysis of marine zooplankton community dynamics associated with environmental change. We used zooplankton groups with common functional properties to assess long‐term trends in the zooplankton caused by certain environmental conditions in a highly eutrophicated gulf.Time series of zooplankton traits have been collected since the 1960s in the Gulf of Riga, Baltic Sea, and were analyzed using a combination of multivariate methods (principal coordinate analysis) and generalized additive models.One of the most significant changes was the considerable increase in the amount of the zooplankton functional groups (FGR) in coastal springtime communities, and dominance shifts from more complex to simpler organism groups—cladocerans and rotifers.The results also show that functional trait organism complexity (body size) decreased considerably due to cladoceran and rotifer increase following elevated water temperature. Salinity and oxygen had negligible effects on the zooplankton community.
Highlights
To detect changes in multispecies communities caused by environmental changes, the communities have traditionally been studied based on taxonomic classification of species, focusing on their abundance and diversity (Sherman, Solow, Jossi, & Kane, 1998)
The results show that functional trait organism complexity decreased considerably due to cladoceran and rotifer increase following elevated water temperature
We have used traits to determine how the zooplankton community is associated with environmental gradients in a highly eutrophicated gulf
Summary
To detect changes in multispecies communities caused by environmental changes, the communities have traditionally been studied based on taxonomic classification of species, focusing on their abundance and diversity (Sherman, Solow, Jossi, & Kane, 1998). This approach, does not provide immediate information on the functioning and the ecological properties of the communities, but only on their composition and relative abundance. An increase in hypoxia due to rising temperatures and accelerated eutrophication in the Baltic Sea is predicted (Carstensen et al, 2014; Conley et al, 2009; Karlson, Rosenberg, & Bonsdorff, 2002)
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