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Social context may affect urinary excretion of 11-ketotestosterone in african c...
Hirschenhauser, Katharina; Canário, Adelino V. M.; Ros, Albert F. H.; Taborsky, Michael; Oliveira, Rui FilipeWe previously investigated the androgen responsiveness of males to simulated partner and territory intrusions in five African cichlid species (Neolamprologus pulcher, Lamprologus callipterus, Tropheus moorii, Pseudosimochromis curvifrons, Oreochromis mossambicus; Hirschenhauser et al., 2004). Here we re-analysed data on 11-ketotestosterone (11-KT) levels in holding water to compare the free (presumably from the...
Metabolic costs of aggressive behaviour in the siamese fighting fish, Betta spl...
Castro, Nídia; Ros, Albert F. H.; Becker, Klaus; Oliveira, Rui FilipeAggressive conflicts between males are often resolved by means of multiple ritualized agonistic displays without damaging escalation. Apparently, in such cases by using those displays opponents exchange important motivational and physical information on which they base a decision to stay or leave the interaction. In the Siamese fighting fish, the time spent spreading the dorsal fin and erecting the gill coverts...
Alternative male reproductive tactics and the immunocompetence handicap in the ...
Ros, Albert F. H.; Bouton, Niels; Santos, Ricardo Serrão; Oliveira, Rui FilipeIn the Azorean rock-pool blenny (Parablennius parvicornis) reproductively active males display alternative morphotypes, which differ in the expression of secondary sexual characters (SSC). Males expressing SSC, theMCmorphotype, have high androgen levels and compete for crevices that will be visited by females to spawn.MCmales holding nests court females and care for the eggs. Males with low expression of SSC, t...
Mate choice in the galilee St. Peter's fish, Sarotherodongal galilaeus
Ros, Albert F. H.; Zeilstra, IIja; Oliveira, Rui FilipeThis study reveals the correlation between operational sex ratio (OSR), body characteristics and pairing in one-year-old reproductively active St. Peter’s fish, Sarotherodon galilaeus, a mouth brooding tilapia that shows a wide variety in mating strategies including uni- vs biparental brood care, and monogamy vs polygamy. In this study individually marked fish were exposed to different OSR regimes: male-biased,...
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