16 research outputs found
Interplay between Homeobox proteins and Polycomb repressive complexes in p16INK4a regulation
“Ficedula”: an open-source MATLAB toolbox for cutting, segmenting and computer-aided clustering of bird song
Tap dancing birds: the multimodal mutual courtship display of males and females in a socially monogamous songbird
Multiple male sexual signals and female responsiveness in the swordtail characin, Corynopoma riisei
Spatial and age-related variation in use of locally common song elements in dawn singing of song sparrows Melospiza melodia: old males sing the hits
Multimodal flight display of a neotropical songbird predicts social pairing but not extrapair mating success
Models of sexual selection predict that socially monogamous females may gain direct or indirect (genetic) benefits by mating with multiple males. We addressed current hypotheses by investigating how, in the socially monogamous blue-black grassquit (Volatinia jacarina), male courtship and territory quality varied with social and extrapair paternity. Males of this tropical granivorous passerine exhibit multimodal displays integrating motor (leap displays) and acoustic components. Across 3 years, we found that extrapair paternity ranged from 8 to 34 % of all nestlings and from 11 to 47 % of all broods. Extrapair and socially paired male territories had similar seed densities. Females preferred to pair socially with males executing higher leaps, but no other male display characteristic associated with paternity loss and extrapair fertilizations. Extrapair and social mates did not differ in genetic similarity to female partners nor in inbreeding levels. Additionally, inbreeding and body condition of extrapair and within-pair nestlings did not differ. Thus, not only did we reject the direct benefits hypothesis for extrapair copulations, but our results also did not support the additive and nonadditive genetic benefits hypotheses. Instead, we found support for benefits through selection of potentially “good fathers,” specifically for females that chose to pair socially with males exhibiting enhanced performance in their displays.</p