La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	A Decade of Change in the Skidaway River Estuary. III. Plankton
Auteurs :	Peter G. Verity, Auteur ; David G. Borkman, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (33(2) MAR 2010)
Article en page(s) :	513-540
Résumé :	The Skidaway River estuary, GA (USA), a tidally dominated subtropical system surrounded by extensive Spartina salt marshes, is experiencing steady increases in nutrients, chlorophyll, and particulate matter and decline in dissolved oxygen, associated with cultural eutrophication. A long-term study is documenting changes in these parameters: previous papers Verity (Estuaries 25:944-960, 2002a, Estuaries 25:961-975, b) reported on hydrography, nutrients, chlorophyll, and particulate matter during 1986-1996; plankton community responses are reported here. Phytoplankton, bacteria, heterotrophic nanoplankton and dinoflagellates, ciliates, and copepods exhibited strong seasonal cycles in abundance driven by temperature and resource availability, typically with summer maxima and winter minima. However, cultural eutrophication coincided with altered planktonic food webs as autotrophic and heterotrophic communities responded to increasing concentrations and changing ratios of inorganic and organic nutrients, potential prey, and predators. Small (

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