La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Contribution of copepods, cladocerans and cirripeds to phosphatase activity in mediterranean zooplankton
Auteurs :	G. Boge, Auteur ; J. L. Jamet, Auteur ; S. Richard, Auteur ; D. Jamet, Auteur ; N. Jean, Auteur
Type de document :	Article
Dans :	Hydrobiologia (468(1-3) JAN 2002)
Article en page(s) :	147-154
Résumé :	The hydrolysis of dissolved phosphoric esters by zooplankton was studied in Toulon seaport (N.W Mediterranean Sea, France). Zooplankton was collected on 90 mum filters. The enzyme reaction was studied using paranitrophenyl phosphate (p-NPP) dissolved in sea water. The particulate material activity was expressed as V max (reaction rate when the enzyme is saturated with substrate) using Eadie-Hofstee plots. The activity per L. was high in spring and decreased from summer to winter. Biomass and zooplankton abundance varied also widely during the year. There were significant correlations between activity per L. and the cirriped cyprid abundance. In contrast, during periods when cyprids were absent, positive correlations with copepod and cladoceran abundance were found. Specific activity varied also during the year, with high values in spring and low values in winter. This activity was positively correlated with cyprid abundance, but not with total zooplankton, copepod or cladoceran abundance. These results indicated that copepods and cladocerans contributed to the overall enzyme production, and that cirripeds could be responsible of high specific activities.

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