10.5061/DRYAD.SC6K5
Bellamy, Lawrence
University College London
Chapman, Nadine
University College London
Fowler, Kevin
University College London
Pomiankowski, Andrew
University College London
Data from: Sexual traits are sensitive to genetic stress and predict
extinction risk in the stalk-eyed fly, Diasemopsis meigenii
Dryad
dataset
2013
Extinction risk
Heterosis
sexual ornament
stalk-eyed fly
2013-04-12T15:35:55Z
2013-04-12T15:35:55Z
en
https://doi.org/10.1111/evo.12135
243923 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
The handicap principle predicts that sexual traits are more susceptible to
inbreeding depression than nonsexual traits. However, this hypothesis has
received little testing and results are inconsistent. We used 11
generations of full-sibling mating to test the effect of inbreeding on
sexual and nonsexual traits in the stalk-eyed fly Diasemopsis meigenii.
Consistent with the theoretical predictions, the male sexual trait
(eyespan) decreased more than nonsexual traits (female eyespan and male
wing length), even after controlling for body size variation. In addition,
male eyespan was a reliable predictor of line extinction, unlike other
nonsexual traits. After 11 generations, inbred lines were crossed to
generate inbred and outbred families. All morphological traits were larger
in outbred individuals than inbred individuals. This heterosis was greater
in male eyespan than in male wing length, but not female eyespan. The
elevated response in male eyespan to genetic stress mirrored the result
found using environmental stress during larval development and suggests
that common mechanisms underlie the patterns observed. Overall, these
results support the hypothesis that male sexual traits suffer more from
inbreeding depression than nonsexual traits and are in line with
predictions based on the handicap principle.
Bellamy et al. file 1Bellamy et al. FIle 2Bellamy et al. File 3