title: Parasites, pathological conditions and resistance to Marteilia cochillia in lagoon cockle Cerastoderma glaucum from Galicia (NW Spain).
abstract: A histopathological survey revealed parasites and pathological conditions affecting lagoon cockles Cerastoderma glaucum along the Galician coast; serious pathological threats were not detected because the potentially pathogenic conditions (infections with a Marteilia-like parasite and bucephalid sporocysts, disseminated neoplasia and a condition involving large foci of heavy haemocytic reaction) were rare, while more prevalent parasites had negligible or limited pathogeny. Considering that C. edule and C. glaucum are sympatric in some Galician rias, it is remarkable that C. glaucum was not seriously affected by Marteilia cochillia while C. edule suffered an intense outbreak of this parasite associated with massive mortality. Comparison of the digestive gland between cockle species showed co-occurrence of digestive tubules in different phases, with abundant disintegrated tubules, in the case of C. glaucum, while C. edule showed synchronicity and absence of fully disintegrated tubules; these differences could influence their susceptibility to M. cochillia because the main location of this parasite in common cockles is the epithelia of the digestive gland. Moreover, the observation of histological sections through the digestive gland easily allows differentiating the 2 cockle species.
authors.affiliation: Centro de Investigacións Mariñas (CIMA), Consellería do Mar, Xunta de Galicia, 36620 Vilanova de Arousa, Spain.
authors.forename: María J
authors.initials: MJ
authors.lastname: Carballal
authors.forename: David
authors.initials: D
authors.lastname: Iglesias
authors.forename: Susana
authors.initials: S
authors.lastname: Darriba
authors.forename: Asunción
authors.initials: A
authors.lastname: Cao
authors.forename: J Carlos
authors.initials: JC
authors.lastname: Mariño
authors.forename: Andrea
authors.initials: A
authors.lastname: Ramilo
authors.forename: Edgar
authors.initials: E
authors.lastname: No
authors.forename: Antonio
authors.initials: A
authors.lastname: Villalba
mesh_terms: D000818:Animals; D001419:Bacteria / Q000145:classification*; D049873:Cardiidae / Q000382:microbiology* / Q000469:parasitology*; D056890:Eukaryota / Q000502:physiology*; D005658:Fungi / Q000502:physiology*; D006790:Host-Parasite Interactions; D054884:Host-Pathogen Interactions; D013030:Spain
keywords: Ciliates; Disseminated neoplasia; Nematopsis; Paravortex; Pseudoklossia; Rickettsia-like organism; Steinhausia; Trematoda