Inbreeding vs outbreeding depression in a marine species with low dispersal potential

Inbreeding depression strongly affects the biological fitness of organisms throughout their life cycle. These negative effects are more pronounced in species with low dispersal potentials, where mating among relatives is more likely. However, in some species, an outbreeding depression could be expre...

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Bibliographic Details
Published in:Marine ecology (Berlin, West) West), 2021-02, Vol.42 (1), p.n/a
Main Authors: Montecinos, Camila, Álvarez, Carolina, Riera, Rodrigo, Brante, Antonio
Format: Article
Language:English
Subjects:
amphipod
Animal behavior
Aquatic crustaceans
Beaches
Body condition
Breeding
Dispersal
Dispersion
Eggs
Fecundity
Females
Inbreeding
Inbreeding depression
Life cycle
Life cycles
Males
mate choice
Mate selection
Mating
Outbreeding
outbreeding depression
Reproductive behaviour
sandy beach
Sexual selection
Species
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Summary:Inbreeding depression strongly affects the biological fitness of organisms throughout their life cycle. These negative effects are more pronounced in species with low dispersal potentials, where mating among relatives is more likely. However, in some species, an outbreeding depression could be expressed when local adaptive and genetic beneficial interactions are disrupted when mating occurs between individuals from different localities. The amphipod Orchestoidea tuberculata inhabits the upper level of sandy beaches. This species has direct development and adults are poor swimmers, resulting in low dispersal potential. We herein evaluated potential inbreeding and outbreeding depression responses in O. tuberculata estimated in fecundity, egg size, and mate choice. Artificial families were used with individuals from different sites within a single beach and from distinct beaches. Results showed that the highest fecundity (66.7%) and the largest egg size (50.1 mm3) were recorded in females that mated with males from the same site, rather than males from other sites and beaches. We also observed potential recognition mechanisms that clearly favored inbreeding (81.8% of males chose females from the same site). These results suggest a potential outbreeding depression in O. tuberculata. Additional studies are needed to elucidate underlying adaptive mechanisms favoring inbreeding in this species.
ISSN:0173-9565
1439-0485
DOI:10.1111/maec.12635