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Bacciger bacciger (Trematoda: Fellodistomidae) infection effects on wedge clam Donax trunculus condition
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Article de revue
Este ítem está publicado en
Diseases of Aquatic Organisms. 2014-10-16, vol. 111, n° 3, p. 259-267
Resumen en inglés
Wedge clams Donax trunculus inhabit high-energy environments along sandy coasts
of the northeastern Atlantic Ocean and the Mediterranean Sea. Two sites were sampled monthly,
one in Morocco (Mehdia), where the density was ...Leer más >
Wedge clams Donax trunculus inhabit high-energy environments along sandy coasts
of the northeastern Atlantic Ocean and the Mediterranean Sea. Two sites were sampled monthly,
one in Morocco (Mehdia), where the density was normal, and one in France (Biscarosse), where
the density was very low. We tested the hypothesis that the difference in density between the sites
was related to infection by the trematode parasite Bacciger bacciger. Identity of both the parasite
and the host were verified using anatomical and molecular criteria. Parasite prevalence (i.e. the
percentage of parasitized clams) was almost 3 times higher at Biscarosse. At this site, overall
prevalence reached 32% in July and was correlated with the migration of several individuals
(with a prevalence of 88%) to the sediment surface. After this peak, prevalence decreased rapidly,
suggesting death of parasitized clams. The deleterious effect of B. bacciger on wedge clams was
also supported by our calculations indicating that the weight of the parasite made up to 56% of the
total weight of the parasitized clams. However, condition indices of trematode-free clams were
also lower in Biscarosse than in Mehdia or other sites, suggesting that other factors such as pollutants
or microparasites (Microcytos sp.) may alter wedge clam population fitness in Biscarosse.< Leer menos
Palabras clave en inglés
Donax trunculus
Bacciger bacciger
Wedge clam
Parasitism
Trematodes
Condition index
Mortality
Molecular identification
Centros de investigación