Prior residence and body size influence interactions between black sea urchins |
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Authors: | Vanessa Rimoli Morishita Francisco Sekiguchi de Carvalho Buchmann Ronaldo Adriano Christofoletti Gilson Luiz Volpato Rodrigo Egydio Barreto |
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Institution: | 1. Campus Experimental do Litoral Paulista, UNESP, Unidade São Vicente, Pça. Infante D. Henrique s/n, 11330-900 São Vicente, São Paulo, Brazil;2. Centro de Biologia Marinha, CEBIMar, USP, Rodovia Manoel Hipólito do Rego, Km 131,5, 11600-000 São Sebastião, São Paulo, Brazil;3. Laboratório de Fisiologia e Comportamento Animal, Departamento de Fisiologia, Instituto de Biociências – UNESP, Rubião Jr s/n, 18618-000 Botucatu, São Paulo, Brazil;4. Research Center on Animal Welfare – RECAW (CNPq), , Brazil |
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Abstract: | Body size and prior residence can modulate agonistic interaction in several animal species, but scientists know little about these relationships in echinoderms. In this study, we tested the effects of these traits on interactions in the black sea urchin (Echinometra lucunter). After a sea urchin was isolated for 24-h in a glass tank to establish prior residence, we introduced an intruder animal adjacent to the resident in the tank and observed interactions for 30 min. The intruder animal was larger, smaller, or size-matched to the resident. We found body size and prior residence concomitantly modulated interactions among black sea urchins, with prior residence as the major determinant. Black sea urchins mainly exhibited opponent inspection and fleeing responses during interaction to avoid fights, especially when a fight could be seriously disadvantageous (small intruder vs. large resident). |
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Keywords: | Echinometra lucunter Echinoderms Fighting asymmetry Aggression |
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