Interactive effects of metal contamination and pathogenic organisms on the marine bivalve Cerastoderma edule.
The present study evaluated the interactive effects of cadmium contamination and pathogenic organisms (trematodes Himasthla elongata and bacteria Vibrio tapetis) singularly and in combination during 7 days on the bivalve Cerastoderma edule. Some defense-related activities were analyzed such as genetic expression, metallothionein and immune responses. Trematode metacercarial infection, similar whatever the treatment, induced the strongest responses of immune parameters. Particularly, the interaction between cadmium and parasite exposures induced unusual responses on gene expression and immune responses. No effect of bacterial challenge appeared on bivalve responses, nevertheless a strong mortality of V. tapetis infected cockles occurred between 7 and 14 days. Cadmium bioaccumulation was significantly modulated by both pathogenic organisms. Furthermore, an antagonistic effect of trematodes and bacteria was shown on metal bioaccumulation of co-infected cockles. These results highlighted the importance of considering the multiplicity of perturbation sources in coastal ecosystems to assess the health status of organisms.
Paul-Pont
Ika
I
Université Bordeaux 1, UMR 5805 CNRS, Station Marine d'Arcachon, Place du Dr. Peyneau, Arcachon 33120, France. i.paulpont@epoc.u-bordeaux1.fr
Gonzalez
Patrice
P
Baudrimont
Magalie
M
Jude
Florence
F
Raymond
Natalie
N
Bourrasseau
Line
L
Le Goïc
Nelly
N
Haynes
Frances
F
Legeay
Alexia
A
Paillard
Christine
C
de Montaudouin
Xavier
X
D000818:Animals; D049873:Cardiidae / Q000187:drug effects* / Q000382:microbiology*; D005880:Gills / Q000187:drug effects / Q000469:parasitology; D006790:Host-Parasite Interactions; D054884:Host-Pathogen Interactions; D008670:Metals / Q000633:toxicity*; D014200:Trematoda; D014733:Vibrio
D008670:Metals