4.5 Article

Competition for shelter sites: Testing a possible mechanism for gammarid species displacements

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BASIC AND APPLIED ECOLOGY
卷 17, 期 5, 页码 455-462

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ELSEVIER GMBH
DOI: 10.1016/j.baae.2016.01.008

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Bioinvasions; Competition; Intra-guild predation;Multi-predator encounters; Sheltering

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Invasions of alien gammarid species have led to reduced abundance of many native gammarid species and earlier gammarid invaders. Infra-guild predation (IGP) has been suggested as the main mechanism causing such species displacements. This study elucidates a mechanism for species displacement that is based on competition for shelter, viz, species excluding each other from a shelter place. Preferences of Dikerogammarus villosus and Gammarus roeselii for shelter space were studied in laboratory experiments. In contrast with night conditions both species showed a strong preference for shelter sites under daytime conditions so that all experiments were carried out under permanent light conditions. Single individuals of D. villosus sheltered more than those of G. roeselii. Intraspecific competition experiments with different size classes and sexes showed that in contrast with D. villosus, the size class had a significant effect on the mean sheltering proportion of individuals of G. roeselii. When both species were brought together in a basin with a shelter site to test interspecific competition, individuals of G. roeselii were actively pushed out of their shelters within 24 h, while D. villosus showed no change in shelter. This led to a significantly increased predation risk for G. roeselii, which was confirmed in an experiment in which a benthic fish was added. IGP only manifested itself after 48h, indicating that competition for shelter preceded IGP When shelter opportunities are in short supply, shelter exclusion may be one of the initial mechanisms for gammarid species displacements.

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