10.5061/DRYAD.4MS2KF1
Grunst, Andrea S.
Indiana State University
Grunst, Melissa L.
Indiana State University
Korody, Marisa L.
Indiana State University
Forrette, Lindsay M.
Indiana State University
Gonser, Rusty A.
Indiana State University
Tuttle, Elaina M.
Indiana State University
Data from: Extrapair mating and the strength of sexual selection: insights
from a polymorphic species
Dryad
dataset
2018
Polymorphic species
extra pair mating
Zonotrichia albicollis
white-throated sparrows
Bateman Gradients
National Science Foundation
https://ror.org/021nxhr62
DUE-0934648
2018-09-19T17:39:56Z
2018-09-19T17:39:56Z
en
https://doi.org/10.1093/beheco/ary160
222085 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Extra-pair mating could drive sexual selection in socially monogamous
species, but support for this hypothesis remains equivocal. We used
lifetime fitness data and a unique model species, the dimorphic
white-throated sparrow (Zonotrichia albicollis), to examine how extra-pair
mating affects the potential for sexual selection. The morphs of this
species employ distinct reproductive strategies, with white males pursuing
extra-pair mating at higher rates than tan counterparts. Social and
extra-pair mating is disassortative by morph, with paternity exchange
occurring primarily between pairs composed of white males and tan females.
We predicted stronger sexual selection as quantified by Bateman gradients
and standardized variance in reproductive success in white compared to tan
males. Furthermore, because males drive extra-pair mating, we predicted
costs of multiple mating and a negative Bateman gradient in tan females.
The Bateman gradient for lifetime reproductive success was larger in white
than tan males, and extra-pair mating contributed more to the Bateman
gradient for white males. However, the Bateman gradient was positive in
tan females. White males had higher variance in annual reproductive
success than tan males or females, but variance in lifetime reproductive
success did not differ between the morphs or sexes. Moreover, extra-pair
mating did not increase variance in male reproductive success relative to
apparent patterns, and within-pair success accounted for much more
variance than extra-pair success. Although extra-pair mating in white
males increases Bateman gradients, and potential for sexual selection via
mate numbers, these latter results call the overall importance of
extra-pair mating in driving selection into question.
Reproductive success and mate numbers of white-throated sparrowsThis file
consists of the data associated with the manuscript, "Extra-pair
mating and the strength of sexual selection: Insights from a polymorphic
species". Each line contains an individual ID, the year of
reproductive performance, the morph (white-striped or tan-striped), the
sex, the number of mates for that year, the number of offspring produced
for that year, and the number of social versus extra-pair mates. In
addition, for each individual, lifetime reproductive success, and the
number of mates averaged across the lifespan is given. In the columns
"Mates2" and "SocMates2", social mates with which an
individual did not produce genetic offspring were not assigned as mates.
In the primary analysis (i.e. in the "Mates" and "Soc Mates
Yr" columns), these social mates were assigned as mates, as explained
in the manuscript.Bateman gradient data WTSP, 9-19-18.xlsx
Eastern North America