10.5061/DRYAD.W9GHX3FP7
Dudaniec, Rachael
0000-0002-1854-6808
Macquarie University
Carey, Alexander
Macquarie University
Svensson, Erik
0000-0001-9006-016X
Lund University
Hansson, Bengt
0000-0001-6694-8169
Lund University
Yong, Chuan ji
Macquarie University
Lancaster, Lesley
University of Aberdeen
Latitudinal clines in sexual selection, sexual size dimorphism, and
sex-specific genetic dispersal during a poleward range expansion
Dryad
dataset
2021
European Commission
https://ror.org/00k4n6c32
Stiftelsen Oscar och Lili Lamms Minne
https://ror.org/02eafbm53
Craafoord **
Crafoord Foundation
https://ror.org/02hwwbr17
Macquarie University
https://ror.org/01sf06y89
Wenner-Gren Foundation
https://ror.org/04qvvhf62
Swedish Research Council
https://ror.org/03zttf063
BECC-a joint Lund-Gothenburg University initiative*
Craafoord *
BECC-a joint Lund-Gothenburg University initiative
2021-03-23T00:00:00Z
2021-03-23T00:00:00Z
en
https://doi.org/10.1111/mec.14709
15669823 bytes
3
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Range expansions can be shaped by sex differences in behaviours and other
phenotypic traits affecting dispersal and reproduction. Here, we
investigate sex differences in morphology, behaviour and genomic
population differentiation along a climate-mediated range expansion in the
common bluetail damselfly Ischnura elegansĀ in northern Europe. We sampled
65 sites along a 583 km gradient spanning the I. elegans range in Sweden
and quantified latitudinal gradients in site relative abundance, sex ratio
and sex-specific shifts in body size and mating status (a measure of
sexual selection). Using single nucleotide polymorphism (SNP) data for 426
individuals from 25 sites, we further investigated sex-specific landscape
and climatic effects on neutral genetic connectivity and migration
patterns. We found evidence for sex differences associated with the I.
elegansĀ range expansion, namely (1) increased male body size with
latitude, but no latitudinal effect on female body size, resulting in
reduced sexual dimorphism towards the range limit, (2) a steeper decline
in male genetic similarity with increasing geographic distance than in
females, (3) male-biased genetic migration propensity, and (4) a
latitudinal cline in migration distance (increasing migratory distances
towards the range margin), which was stronger in males. Cooler mean annual
temperatures towards the range limit were associated with increased
resistance to gene flow in both sexes. Sex ratios became increasingly
male-biased towards the range limit, and there was evidence for a changed
sexual selection regime shifting from favouring larger males in the south,
to favouring smaller males in the north. Our findings suggest sex-specific
spatial phenotype sorting at the range limit, where larger males disperse
more under higher landscape resistance associated with cooler climates.
The combination of latitudinal gradients in sex-biased dispersal,
increasing male body size, and (reduced) sexual size dimorphism should
have emergent consequences for sexual selection dynamics and the mating
system at the expanding range front. Our study illustrates the importance
of considering sex differences in the study of range expansions driven by
ongoing climate change.
Data are RADseq data as in Dudaniec et al (2018) Mol Ecol, filtered as
described in this paper