Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.12/1252
Título: Hormonal anticipation of territorial challenges in cichlid fish
Autor: Antunes, Raquel A.
Oliveira, Rui Filipe
Palavras-chave: Aggression
Associative learning
Social challenge
Data: 2009
Editora: National Academy of Sciences
Citação: Proceedings of the National Academy of Sciences of The United States of America, 106, 15985-15989
Resumo: In many territorial species androgens respond to social interactions. This response has been interpreted as a mechanism for adjusting aggressive motivation to a changing social environment. Therefore, it would be adaptive to anticipate social challenges and reacting to their clues with an anticipatory androgen response to adjust agonistic motivation to an imminent social challenge. Here we test the hypothesis of an anticipatory androgen response to territorial intrusions using classical conditioning to establish an association between a conditioned stimulus (CS = light) and an unconditioned stimulus (US = intruder male) in male cichlid fish (Oreochromis mossambicus). During the training phase conditioned males (CS US paired presentations) showed a higher decrease in latency for agonistic response toward the intruder than unconditioned males (CS–US unpaired presentations). In the test trial, conditioned males showed an increase in androgen levels (i.e., testosterone and 11-ketotestosterone) relative to baseline, in response to the CS alone. This increase was similar to that of control males exposed to real intruders after CS, whereas unconditioned males showed a decrease in androgen levels in response to the CS. Furthermore, conditioned males were significantly more aggressive than unconditioned males during the post-CS period on test trial, even though the intruder male was not present during this period. These results reveal the occurrence of a conditioned androgen response that may give territorial males an advantage in mounting a defense to upcoming territorial intrusions, if the ability to readily elevate androgens does not co-vary with other traits that bear costs.
Peer review: yes
URI: http://hdl.handle.net/10400.12/1252
ISSN: 0027-8424
Aparece nas colecções:UIE-E - Artigos em revistas internacionais

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