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The effects of the invasive rhizocephalan parasite Heterosaccus dollfusi on the agonistic behavior of the in- vasive swimming crab Charybdis longicollis were quantitatively analyzed under standardized conditions. The behavior of uninfected male crabs contained more aggressive elements than that of uninfected females. In encounters between infected males, markedly fewer and less aggressive elements were displayed than in encounters between uninfected males, whereas in encounters between infected females, more aggressive elements were displayed than in encounters between uninfected females. It is suggested that the presence of the parasite reduces belligerence in male crabs, possi - bly to avoid injury and to enhance the life expectancy of host and parasite. Résumé : Les effets d'Heterosaccus dollfusi, un parasite rhizocéphale envahissant, sur le comportement agonistique du crabe nageur envahissant Charybdis longicollis ont été soumis à une analyse quantitative dans des conditions contrô- lées. Les crabes mâles sains montrent plus d'éléments d'un comportement agressif que les femelles saines. Les rencon- tres entre mâles infectés comptent moins d'éléments de comportement agressif et l'agressivité y est moins intense qu'au cours de rencontres entre des mâles sains. Les femelles infectées montrent plus d'éléments de comportement agressif les unes envers les autres que les femelles saines entre elles. Il apparaît donc que la présence du parasite rend les crabes mâles moins belligérants, peut-être pour éviter les blessures et pour améliorer l'espérance de vie des parasi- tes et de leurs hôtes.

canadian journal of zoology

Observations on the agonistic behavior of the swimming crab <i>Charybdis longicollis</i> Leene infected by the rhizocephalan barnacle <i>Heterosaccus dollfusi </i>Boschma

Observations on the agonistic behavior of the swimming crab Charybdis longicollis Leene infected by the rhizocephalan barnacle Heterosaccus dollfusi Boschma