DE MONTAUDOUIN, Xavier; ACCOLLA, Chiara

doi:10.3354/meps12726

Environnements et Paléoenvironnements OCéaniques [EPOC]

ACCOLLA, Chiara

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Ce document a été publié dans

Marine Ecology Progress Series. 2018-01-01

Résumé en anglais

We tested the hypothesis that high-density populations of the non-indigenous gastropod Crepidula fornicata increase settlement of conspecific recruits (facilitation process), and that this facilitation is balanced by competition processes. To verify our hypothesis, we sampled C. fornicata at 2 drastically different densities for 10 yr. We found that at high densities, the number of 1 yr old individuals per square meter colonizing the habitat and individual growth performances were higher in comparison with the low-density condition (Allee effect). In contrast, the production/biomass ratio (P/B), a good indicator of population fitness, was lower at higher densities. We relate this lower P/B ratio to the deficit of young individuals compared to adult biomass. We conclude that the net effect of high density on the conspecific colonization processes of the population is positive, thanks to the higher available hard substrate for larvae (facilitation). However, intraspecific competition also occurs and mitigates this positive effect. Therefore, we suggest that it is particularly important to take into account the ‘net’ balance between costs and benefits (i.e. what we observe) when analyzing population growth, in order to better understand its dynamics.< Réduire

Mots clés en anglais

Crepidula fornicata

Facilitation

Competition

P/B ratio

Non-indigenous species

Population dynamics

URI

https://oskar-bordeaux.fr/handle/20.500.12278/183779

DOI

http://dx.doi.org/10.3354/meps12726

Unités de recherche

EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805

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Intraspecific trade-offs between facilitation and competition in the non-native mollusc Crepidula fornicata

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Résumé en anglais

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