La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Trophic Links in the Plankton in the Low Salinity Zone of a Large Temperate Estuary: Top-down Effects of Introduced Copepods
Auteurs :	Joanna K. York, Auteur ; George B. McManus, Auteur ; Wim J. Kimmerer, Auteur ; Anne M. Slaughter, Auteur ; Toni R. Ignoffo, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (37(3) MAY 2014)
Article en page(s) :	576-588
Résumé :	We investigated trophic relationships involving microzooplankton in the low salinity zone of the San Francisco Estuary (SFE) as part of a larger effort aimed at understanding the dynamics of the food web supporting the endangered delta smelt, Hypomesus transpacificus. We performed 14 cascade experiments in which we manipulated the biomass of a copepod (Limnoithona tetraspina, Pseudodiaptomus forbesi, or Acartiella sinensis) and quantified responses of lower trophic levels including bacterioplankton, phytoplankton, and microzooplankton. Microzooplankton comprised a major food source for copepods; 9 out of 14 experiments showed removal of at least one group of microzooplankton by copepods. In contrast, the impact of copepods on phytoplankton was indirect; increased copepod biomass led to greater growth of phytoplankton in 3 of

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