Life-history differences in age-dependent expressions of multiple ornaments and behaviors in a lekking bird
Kervinen, M., Lebigre, C., Alatalo, R. V., Siitari, H., & Soulsbury, C. D. (2015). Life-history differences in age-dependent expressions of multiple ornaments and behaviors in a lekking bird. American Naturalist, 185(1), 13-27. https://doi.org/10.1086/679012
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American NaturalistAuthors
Date
2015Copyright
© 2014 by The University of Chicago. Published in this repository with the kind permission of the publisher.
Age is a major factor explaining variation in life-history
traits among individuals with typical patterns of increasing trait values
early in life, maximum trait expression, and senescence. However,
age-dependent variation in the expressions of sexually selected traits
has received less attention, although such variation underpins differences
in male competitive abilities and female preference, which
are central to sexual selection. In contrast to previous studies focusing
on single traits, we used repeated measures of seven sexually selected
morphological and behavioral traits in male black grouse (Tetrao
tetrix) to quantify the effects of age and life span on their expressions
and quantified this variation in relation to male reproductive effort.
Trait expression increased with age, but long-lived males had a slower
increase and delayed maxima in trait values compared with shortlived
males. There was evidence of terminal investment (increasing
trait values during the last breeding season) in some traits and senescence
in all traits. These trait dynamics were largely explained by
the timing of male peak lekking effort. This study shows that fully
understanding the variation in sexually selected traits and fitness
benefits associated with sexual selection requires accounting for the
complex interaction among individual age, life span, and the timing
of individuals’ investment in reproduction.
...


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