AB 6:153-158 (2009)  -  DOI: https://doi.org/10.3354/ab00178

Effects of post-settlement mortality on size and parasite load in juvenile Diplodus vulgaris and D. sargus in the Mediterranean

Serge Planes1,*, David Lecchini2, Pascal Romans1,3, Suzanne C. Mills1

1UMR 5244 CNRS - EPHE - UPVD, Université de Perpignan, 66860 Perpignan, France
2Institut de Recherche pour le Développement, Centre IRD Noumea, UR 128 CoReUs, 98848 Noumea, New Caledonia
3Present address: Observatoire Océanologique de Banyuls - UM 2348, BP 44, 66651 Banyuls-sur-Mer, Cedex, France

ABSTRACT: This study explored how mortality processes influence life history traits of recently settled juvenile fishes (Diplodus vulgaris and D. sargus) in the Mediterranean. Mortality was estimated by measuring the decrease in abundance of a cohort from settlement to 4 mo post-settlement. Growth and parasite load were simultaneously measured over time to determine those phenotypes more susceptible to mortality. Diplodus spp. juvenile mortality was between 71 and 81% over the 4 mo period. A decrease in the coefficient of variation in size over time suggests that mortality may influence growth of both Diplodus species. A decrease in parasite abundance of both Diplodus species 60 d after settlement suggests that fish with higher parasite loads may have been more susceptible to mortality. Overall, mortality did not act randomly in D. vulgaris and D. sargus cohorts, as the variance in both size and parasite abundance of recently settled juveniles was not comparable to that of the adult population; only larger, parasite-free individuals survived.


KEY WORDS: Mortality processes · Selection · Parasites · Growth · Life history


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Cite this article as: Planes S, Lecchini D, Romans P, Mills SC (2009) Effects of post-settlement mortality on size and parasite load in juvenile Diplodus vulgaris and D. sargus in the Mediterranean. Aquat Biol 6:153-158. https://doi.org/10.3354/ab00178

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