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Macroevolutionary origin and adaptive function of a polymorphic female signal involved in sexual conflict

Willink, Beatriz LU ; Duryea, M. Catherine and Svensson, Erik I. LU (2019) In American Naturalist 194(5). p.707-724
Abstract

Intersexual signals that reveal developmental or mating status in females have evolved repeatedly in many animal lineages. Such signals have functions in sexual conflict over mating and can therefore influence sexually antagonistic coevolution. However, we know little about how female signal development modifies male mating harassment and thereby sexual conflict. Here, we combine phylogenetic comparative analyses of a color polymorphic damselfly genus (Ischnura) with behavioral experiments in one target species to investigate the evolutionary origin and current adaptive function of a developmental female color signal. Many Ischnura species have multiple female color morphs, which include a male-colored morph (male mimics) and one or two... (More)

Intersexual signals that reveal developmental or mating status in females have evolved repeatedly in many animal lineages. Such signals have functions in sexual conflict over mating and can therefore influence sexually antagonistic coevolution. However, we know little about how female signal development modifies male mating harassment and thereby sexual conflict. Here, we combine phylogenetic comparative analyses of a color polymorphic damselfly genus (Ischnura) with behavioral experiments in one target species to investigate the evolutionary origin and current adaptive function of a developmental female color signal. Many Ischnura species have multiple female color morphs, which include a male-colored morph (male mimics) and one or two female morphs that differ markedly from males (heterochrome females). In Ischnura elegans, males and male-mimicking females express a blue abdominal patch throughout postemergence life. Using phenotypic manipulations, we show that the developmental expression of this signaling trait in heterochrome females reduces premating harassment prior to sexual maturity. Across species this signal evolved repeatedly, but in heterochrome females its origin is contingent on the signal expressed by co-occurring male-mimicking females. Our results suggest that the co-option of a male-like trait to a novel female anti-harassment function plays a key role in sexual conflict driven by premating interactions.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cross-sexual transfer, Male mating harassment, Male mimicry, Sex-limited polymorphism, Sexual dimorphism, Sexually antagonistic coevolution
in
American Naturalist
volume
194
issue
5
pages
707 - 724
publisher
University of Chicago Press
external identifiers
  • scopus:85071933873
ISSN
0003-0147
DOI
10.1086/705294
language
English
LU publication?
yes
id
7072fc46-0b40-4c0c-b233-fea8b15f76b6
date added to LUP
2019-09-17 13:42:57
date last changed
2020-04-02 02:41:41
@article{7072fc46-0b40-4c0c-b233-fea8b15f76b6,
  abstract     = {<p>Intersexual signals that reveal developmental or mating status in females have evolved repeatedly in many animal lineages. Such signals have functions in sexual conflict over mating and can therefore influence sexually antagonistic coevolution. However, we know little about how female signal development modifies male mating harassment and thereby sexual conflict. Here, we combine phylogenetic comparative analyses of a color polymorphic damselfly genus (Ischnura) with behavioral experiments in one target species to investigate the evolutionary origin and current adaptive function of a developmental female color signal. Many Ischnura species have multiple female color morphs, which include a male-colored morph (male mimics) and one or two female morphs that differ markedly from males (heterochrome females). In Ischnura elegans, males and male-mimicking females express a blue abdominal patch throughout postemergence life. Using phenotypic manipulations, we show that the developmental expression of this signaling trait in heterochrome females reduces premating harassment prior to sexual maturity. Across species this signal evolved repeatedly, but in heterochrome females its origin is contingent on the signal expressed by co-occurring male-mimicking females. Our results suggest that the co-option of a male-like trait to a novel female anti-harassment function plays a key role in sexual conflict driven by premating interactions.</p>},
  author       = {Willink, Beatriz and Duryea, M. Catherine and Svensson, Erik I.},
  issn         = {0003-0147},
  language     = {eng},
  number       = {5},
  pages        = {707--724},
  publisher    = {University of Chicago Press},
  series       = {American Naturalist},
  title        = {Macroevolutionary origin and adaptive function of a polymorphic female signal involved in sexual conflict},
  url          = {http://dx.doi.org/10.1086/705294},
  doi          = {10.1086/705294},
  volume       = {194},
  year         = {2019},
}