The SPONTOX project suggests to use sponge model as sentinels to the networks of seawater quality monitoring of the littoral environment. Indeed, sponges occur a large part of the qualities required for a bioindicator of pollution. After analyses of contaminant levels, one of the species, Hymeciadon perlevis, revealed best capacity of bioaccumulation.
The Spontox program covers several steps:
1- The geolocation of the sponge colonies on several seacoast stations along the area of Basse-Normandie. This work will suppose a strategy of systematic taking and identification of toweling. Then, various parameters of the sponge populations (density, diversity, dominance …) were also estimated. After the identification chemical analyses of the different species, the sponge chosen as model was Hymeniacidon perlevis.
2- A development of in vitro spongiculture in the SMEL structures of Blainville-sur-Mer.
3- Experiments on sponges exposed in vitro to various contaminations realized in controlled conditions (metals and organic contaminants). Nature of contaminants as well as ranges of concentrations were depended on measures performed on wild populations collected in situ from the various stations of Basse-Normandie. On the other hand, contaminations were monitored in situ by the method of caging which was developed. The tests of ecotoxicology led in vitro and the caging will concern in parallel the sponge Hymeniacidon perlevis and the mussel Mytilus edulis, the bioindicator already used into the networks of quality surveillance of the environment through the ROCCH network.
Région Basse-Normandie, AESN, CG 50
Smel (Blainville sur Mer, 50)
Smel (Blainville sur Mer, 50) ; Cnam/Intechmer (Cherbourg, 50) ; Labéo 50 (St Lô , 50)