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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Elemental Composition of Mnemiopsis leidyi A. Agassiz 1865 and Its Implications for Nutrient Recycling in a Long Island Estuary
Auteurs :	Marianne E. McNamara, Auteur ; Darcy J. Lonsdale, Auteur ; Robert C. Aller, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (36(6) NOV 2013)
Article en page(s) :	1253-1264
Résumé :	The ctenophore Mnemiopsis leidyi is an ecologically important predator in temperate coastal environments. Their populations fluctuate seasonally, serving as sinks of nutrients during periodic blooms, but as sources via excretion and during population collapse. Ctenophores were analyzed for elemental composition (C, N, and P) during 2008 and 2009 in Great South Bay, NY, USA. Salt-free weight percent C, N, and P correlated positively with ctenophore sizes and zooplankton prey abundances. Nitrogen and P were higher at the onset of blooms than during collapse when prey were substantially fewer. Ctenophores collected during average to high zooplankton densities had atomic ratios averaging C/N similar to 6:1 and C/P similar to 66:1, but became C- and P-depleted (C/N similar to 5:1, C/P similar to 128:1) with decreasing zooplankton. Incubations demonstrated rapid remineralization of ctenophore biomass (as NH4 (+), HPO4 (2-)), following first order kinetics (e.g., k similar to 0.1-0.4 day(-1)) with enriched stoichiometric N and P fractionation relative to biomass under both oxic and anoxic conditions. Based on reported excretion rates, nutrient regeneration from excretion by active populations greatly exceeds nutrients remineralized during population crashes. To our knowledge, this is the first study documenting natural seasonal patterns in ctenophore elemental stoichiometry as a function of ctenophore size and prey availability.

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