Influence of food on the assimilation of selected metals in tropical bivalves from the New Caledonia lagoon: qualitative and quantitative aspects Laetitia Hédouin...[et al.]

By: Contributor(s): Material type: TextTextPublication details: [S.l.] 2010 Elsevier Ltd. 2010Description: p. 568-575 ill. 29 cmISSN:
  • 0025-326X
Subject(s): In: Marine Pollution Bulletin No. 61 (2010), p. 568-575
Item type: Journal article
Tags from this library: No tags from this library for this title. Log in to add tags.
Holdings
Current library Call number Status Date due Barcode
MAIN LIBRARY Noumea D 594 HED 2010 Available 44113

The present study aimed at examining the influence of food quality and quantity on the assimilation efficiency
(AE) of metals in two abundant bivalves in the New Caledonia lagoon, the oyster Isognomon isognomon
and the clam Gafrarium tumidum. Bivalves were exposed via their food to the radiotracers of three
metals of concern in New Caledonia (54Mn, 57Co and 65Zn) under different feeding conditions (phytoplankton
species, cell density, and cell-associated metal concentration). When bivalves were fed Heterocapsa
triquetra, Emiliania huxleyi and Isochrysis galbana, AE of Mn, Co and Zn was strongly influenced by
the phytoplankton species and by the metal considered. In contrast, when fed one given phytoplankton
species previously exposed to different concentrations of Co, phytoplankton-associated Co load had no
influence on the AE and on the retention time of the metal in both bivalves. Metals ingested with I. galbana
displayed generally the highest AE in both bivalve species, except for Mn in clams for which the
highest AE was observed for H. triquetra. Influence of food quantity was investigated by exposing bivalves
to different cell densities of I. galbana (5 103, 104 or 5 104 cell ml1). As for food quality, food quantity
was found to influence AE of Mn, Co and Zn, the highest AE being observed when bivalves were fed the
lowest cell density. Overall, results indicate that the two bivalve species are able to adjust their feeding
strategies according to the food conditions prevailing in their environment.