| Summary: | In pelagic food webs, zooplankton is the link between lower and higher trophic levels. It is thus essential to know how the zooplankton community structure varies with its environment. We investigated the seasonal and spatial variation in the zooplankton diversity and community structure during two consecutive years in the Kalmar Sound, along the Swedish east coast, an area with a strong bathymetric gradient and of high ecological importance for e.g. commercial fish species. Two zooplankton communities were identified in the area: a coastal/estuarine community in the south and an open-water community in the north. They were separated mainly by differing salinity and temperature conditions. Biodiversity increased from spring to autumn and was higher in the open waters. © 2014. C. Díaz-Gil, M. Werner, O. Lövgren, O. Kaljuste and M. Casini were partially funded by the Swedish PLAN FISH project, financed by the Swedish Environmental Protection Agency and the Swedish Agency for Marine and Water Management. C. Díaz-Gil was also funded by the EU Erasmus Program for international mobility of students Peer Reviewed
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