The effect of arginine vasotocin on courtship behaviour in a blenniid fish with alternative reproductive tactics
In a sex−role reversed population of the peacock blenny, Salaria pavo, two alternative male types are present: (a) older and larger nest−holder males that defend nests in which females come to spawn, and (b) younger and smaller sneaker males that mimic female−courtship behaviour and nuptial colouration in order to try to sneak fertilizations during spawning episodes. In this study the effects of exogenous administration of arginine vasotocin (AVT, 3 μg/g body weight) on the behaviour of nest-holder males, sneakers and females was tested. AVT induced the expression of female courtship behaviour in sneakers and female nuptial colouration in sneakers and in females, but failed to promote the expression of male courtship behaviour in both male types.
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- Foran, C.M. and Bass, A.H. 1999. Preoptic GnRH and AVT: axes for sexual plasticity in teleost fish. Gen. Comp. Endocrinol. 116: 141–152.Google Scholar
- Godwin, J., Sawby, R., Warner, R.R., Crews, D. and Grober, M.S. 2000. Hypothalamic arginine vasotocin mRNA abundance variation across sexes and with sex change in a coral reef fish. Brain Behav. Evol. 55: 77–84.Google Scholar
- Gonçalves, E.J., Almada, V.C., Oliveira, R.F. and Santos, A.J. 1996. Female mimicry as a mating tactic in males of the blenniid fish Salaria pavo. J. Mar. Biol. Ass. U.K. 76: 529–538.Google Scholar
- Grober, M.S., George, A.A., Watkins, K.K., Carneiro, L.A. and Oliveira, R.F. 2002. Forebrain AVT and courtship in a fish with alternative reproductive tactics. Brain Res. Bull. 57: 23–25.Google Scholar
- Moore, F.L. 1992. Evolutionary precedents for behavioral actions of oxytocin and vasopressin. Ann. N.Y. Acad. Sci. 652: 156–165.Google Scholar
- Oliveira, R.F., Carneiro, L.A., Gonçalves, D.M., Canário, A.V.M. and Grober, M.S. 2001a. Effects of 11-Ketotestosterone in sneaker males of the peacock blenny, a species with male alternative mating tactics. Brain Behav. Evol. 58: 28–37.Google Scholar
- Oliveira, R.F., Canário, A.V.M. and Grober, M.S. 2001b. Male sexual polymorphism, alternative reproductive tactics and androgens in combtooth blennies (Pisces: Blenniidae). Horm. Behav. 40: 266–275.Google Scholar
- Patzner, R.A., Seiwald, M., Adlgasser, M. and Kaurin, G. 1986. The reproduction of Blennius pavo. V. Reproductive behaviour in the natural environment. Zool. Anz. 216: 338–350.Google Scholar