La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Linkage between microzooplankton grazing and phytoplankton growth in a Gulf of Mexico estuary
Auteurs :	M. C. Murrell, Auteur ; R. S. Stanley, Auteur ; E. M. Lores, Auteur ; G. T. DiDonato, Auteur ; D. A. Flemer, Auteur
Type de document :	Article
Dans :	Estuaries (25(1) FEB 2002)
Article en page(s) :	19-29
Résumé :	Microzooplankton dilution grazing experiments were conducted with water collected from Pensacola Bay, Florida (USA) on 12 dates at 2 sites. Statistically significant grazing rates were observed in 22 of 24 experiments. Grazing rates in Upper Bay and Lower Bay were similar averaging 0.54 and 0.51 d(-1), respectively. Phytoplankton growth rates were also similar at the two sites, averaging 1.02 and 1.00 d(-1) at Upper Bay and Lower Bay, respectively. Phytoplankton growth rates usually exceeded grazing rates by about a factor of two, though microzooplankton grazing represented a significant mortality for phytoplankton. The literature suggests a linkage between phytoplankton growth and microzooplankton grazing that spans a wide variety of aquatic environments. While individual growth and grazing rates were variable, growth frequently exceeded grazing by about two-fold. This implies that the role of microzooplankton is similar across a wide variety of aquatic systems.

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