Details

Autor(en) / Beteiligte

• DuVal, Emily H.
• Goymann, Wolfgang

Titel

Hormonal correlates of social status and courtship display in the cooperatively lekking lance-tailed manakin

Ist Teil von

• Hormones and behavior, 2011-01, Vol.59 (1), p.44-50

Ort / Verlag

Amsterdam: Elsevier Inc

Erscheinungsjahr

2011

Quelle

MEDLINE

Beschreibungen/Notizen

• Though cooperative behavior has long been a focus of evolutionary biology, the proximate hormonal mechanisms underlying cooperative interactions remain poorly understood. Lance-tailed manakins (Chiroxiphia lanceolata) are tropical passerines that form long-term male–male partnerships and cooperate in paired male courtship displays. To elucidate patterns of natural hormonal variation in relation to cooperation and reproductive behavior, we examined circulating androgen levels of male lance-tailed manakins in relation to social status, display behavior, and time of year. We found significantly higher circulating androgen levels in alpha-ranked (breeding) males compared to non-alpha adult males in the population. Beta males, which participated in courtship displays but did not copulate, had androgen levels indistinguishable from those of unpaired adult males that never displayed for females, suggesting that an elevated concentration of plasma testosterone in tropical lekking birds may be associated primarily with copulatory behavior or other status-specific traits, and not the performance of courtship display. Androgens decreased throughout the breeding season for males of all status categories. Interestingly, alphas that displayed for females in the observation session prior to sampling had lower androgen levels than alphas that did not display for females. This pattern may result from female discrimination against alpha males at display areas with high levels of social conflict among males, as social disruption is linked to elevated testosterone in many species. However, recent change of a display partner was not related to alpha androgen levels. We discuss alternative explanations and the possible implications of these results, and generate several testable predictions for future investigations. ►Beta male lance-tailed manakins cooperate in complex courtship displays with dominant alpha partners, but betas have testosterone levels indistinguishable from non-displaying males. ►Testosterone decreased throughout the breeding season for male lance-tailed manakins while courtship levels remained high. ►Recent performance of courtship display was associated with decreased testosterone levels among alpha males.