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Do earthen structures more often deter barricade building species than non-building species in crabs of the family Dotillidae (brachyura, Ocypodoidea)?

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[The small ocypodoid crab, Ilyoplax pusilla exhibits a subtle territorial behaviour termed barricade building. The barricades are made of mud. To better understand the evolution of this behaviour, the responses to artificial earthen structures built near the crabs' burrows were compared between I. pusilla and two other species, Ilyoplax deschampsi and Scopimera globosa, of the same family, that do not build barricades. Ilyoplax pusilla broke the structure less frequently than did S. globosa and more frequently avoided it than did I. deschampsi. These results suggest that I. pusilla is more disposed to avoid the earthen structure, which would favour the evolution of barricade building. Le petit crabe Ocypodidae, Ilyoplax pusilla montre un comportement territorial subtil nommé construction de barricades. Les barricades sont faites de boue. Afin de mieux comprendre l'évolution de ce comportement, les réponses à des structures artificielles de terre construites près des terriers de crabes ont été comparées entre I. pusilla et deux autres espèces, Ilyoplax deschampsi et Scopimera globosa, de la même famille, qui ne construisent pas de barricades. Ilyoplax pusilla a détruit la structure moins fréquemment que S. globosa et l'évitait plus fréquemment que I. deschampsi. Ces résultats suggèrent que I. pusilla est plus disposé à éviter la structure de terre, ce qui favoriserait l'évolution de la construction de barricade., The small ocypodoid crab, Ilyoplax pusilla exhibits a subtle territorial behaviour termed barricade building. The barricades are made of mud. To better understand the evolution of this behaviour, the responses to artificial earthen structures built near the crabs' burrows were compared between I. pusilla and two other species, Ilyoplax deschampsi and Scopimera globosa, of the same family, that do not build barricades. Ilyoplax pusilla broke the structure less frequently than did S. globosa and more frequently avoided it than did I. deschampsi. These results suggest that I. pusilla is more disposed to avoid the earthen structure, which would favour the evolution of barricade building. Le petit crabe Ocypodidae, Ilyoplax pusilla montre un comportement territorial subtil nommé construction de barricades. Les barricades sont faites de boue. Afin de mieux comprendre l'évolution de ce comportement, les réponses à des structures artificielles de terre construites près des terriers de crabes ont été comparées entre I. pusilla et deux autres espèces, Ilyoplax deschampsi et Scopimera globosa, de la même famille, qui ne construisent pas de barricades. Ilyoplax pusilla a détruit la structure moins fréquemment que S. globosa et l'évitait plus fréquemment que I. deschampsi. Ces résultats suggèrent que I. pusilla est plus disposé à éviter la structure de terre, ce qui favoriserait l'évolution de la construction de barricade.]

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