Environmental modulation of androgen levels and secondary sex characters in two populations of the peacock blenny Salaria pavo

Hormones and Behavior
João L SaraivaRui F Oliveira

Abstract

Morphology and endocrinology were studied in two populations of the peacock blenny Salaria pavo, with different regimes of sexual selection imposed by differences in nest site availability. The peacock blenny is a small, sexually dimorphic benthic fish that presents exclusive paternal care of the clutch and inhabits rocky shores of the Mediterranean and adjacent Atlantic areas. In a population from the Gulf of Trieste (Northern Adriatic sea) inhabiting rocky shores where nest sites are abundant, male-male competition for nests is low, males court females and a low frequency of alternative reproductive tactics (small, parasitic female-mimicking sneaker males that change tactic into nest holders in subsequent breeding seasons) occurs. Conversely at Ria Formosa, a coastal lagoon in Southern Portugal, where nest sites are scarce and highly aggregated, male-male competition for nests is very high, there is sex-role reversal with female courtship and a high frequency of alternative reproductive tactics is observed. Concomitantly, at Ria Formosa nest holder males are larger and present more developed secondary sex characters and higher levels of 11KT than at the Gulf of Trieste. However, the gonads of nest holders and parasitic males ...Continue Reading

References

Oct 1, 1989·General and Comparative Endocrinology·A V Canario, A P Scott
Oct 1, 1982·General and Comparative Endocrinology·D E Kime, N J Manning
Dec 22, 2007·Science·Tim Clutton-Brock
May 1, 1997·The American Naturalist·P StockleyA P Møller
Mar 1, 1991·Fish Physiology and Biochemistry·D L Berlinsky, J L Specker

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Citations

May 31, 2012·Fish Physiology and Biochemistry·J L SaraivaR F Oliveira
Jan 24, 2014·Proceedings. Biological Sciences·David GonçalvesRui F Oliveira

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