MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
Host-parasite relationship of the geoduck Panopea abbreviata and the green alga Coccomyxa parasitica in the Argentinean Patagonian coast
VAZQUEZ, N.; ROFRÍGUEZ, F.; ITUARTE, C.; KLAICH, J.; CREMONTE, F.
JOURNAL OF INVERTEBRATE PATHOLOGY
ACADEMIC PRESS INC ELSEVIER SCIENCE
Año: 2010 vol. 105 p. 254 - 254
The association of the geoduck Panopea abbreviata and the green alga Coccomyxa parasitica is described. The identity of the green alga was confirmed by molecular studies; the alga was found within the hemocytes that infiltrate the connective tissue of the geoduck siphons. Cytological characteristics of hemocytes were not altered by algal infection; very often the algae were seen invested by a digestive vacuole within the hemocyte cytoplasm, evidencing diverse degrees of resorption. Connective cells of siphons were rarely infected by C. parasitica. The mean prevalence of C. parasitica was higher (82%) in San Matías Gulf (42°00′S, 65°05′W) than in San José Gulf (45%) (40º32´S, 64º02´W); except for spring season, where the two locations showed no alga differences in prevalences (80%). The presence-absence of C. parasitica implies that independently of location, season and host size, parasitized geoducks showed lower condition index values than not-parasitized ones. Another bivalve species was found to be occasionally parasitized; only one specimen of the razor clam Ensis macha was infected; none of the oysters Ostrea puelchana and Pododesmus rudis and scallops Aequipecten tehuelchus was parasitized by the green alga.