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Selective predation on wing morphology in sympatric damselflies

Svensson, Erik LU and Friberg, Magne (2007) In American Naturalist 170(1). p.101-112
Abstract
Although predation is thought to affect species divergence, the effects of predator-mediated natural selection on species divergence and in nonadaptive radiations have seldom been studied. Wing melanization in Calopteryx damselflies has important functions in sexual selection and interspecific interactions and in species recognition. The genus Calopteryx and other damselfly genera have also been put forward as examples of radiations driven by sexual selection. We show that avian predation strongly affects natural selection on wing morphology and male wing melanization in two congeneric and sympatric species of this genus (Calopteryx splendens and Calopteryx virgo). Predation risk was almost three times higher for C. virgo, which has an... (More)
Although predation is thought to affect species divergence, the effects of predator-mediated natural selection on species divergence and in nonadaptive radiations have seldom been studied. Wing melanization in Calopteryx damselflies has important functions in sexual selection and interspecific interactions and in species recognition. The genus Calopteryx and other damselfly genera have also been put forward as examples of radiations driven by sexual selection. We show that avian predation strongly affects natural selection on wing morphology and male wing melanization in two congeneric and sympatric species of this genus (Calopteryx splendens and Calopteryx virgo). Predation risk was almost three times higher for C. virgo, which has an exaggerated degree of wing melanization, than it was for the less exaggerated, sympatric congener C. splendens. Selective predation on the exaggerated species C. virgo favored a reduction and redistribution of the wing melanin patch. There was evidence for nonlinear selection involving wing patch size, wing patch darkness, and wing length and width in C. splendens but weaker nonlinear selection on the same trait combinations in C. virgo. Selective predation could interfere with species divergence by sexual selection and may thus indirectly affect male interspecific interactions, reproductive isolation, and species coexistence in this genus. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
reproductive isolation, interspecific competition, correlational selection, indirect effects, speciation, species interactions
in
American Naturalist
volume
170
issue
1
pages
101 - 112
publisher
University of Chicago Press
external identifiers
  • wos:000247527200011
  • scopus:34250800830
ISSN
0003-0147
DOI
10.1086/518181
language
English
LU publication?
yes
id
fed9e666-2864-4749-b5a1-cc2780da25d9 (old id 648179)
date added to LUP
2007-12-05 14:40:03
date last changed
2017-11-12 03:21:36
@article{fed9e666-2864-4749-b5a1-cc2780da25d9,
  abstract     = {Although predation is thought to affect species divergence, the effects of predator-mediated natural selection on species divergence and in nonadaptive radiations have seldom been studied. Wing melanization in Calopteryx damselflies has important functions in sexual selection and interspecific interactions and in species recognition. The genus Calopteryx and other damselfly genera have also been put forward as examples of radiations driven by sexual selection. We show that avian predation strongly affects natural selection on wing morphology and male wing melanization in two congeneric and sympatric species of this genus (Calopteryx splendens and Calopteryx virgo). Predation risk was almost three times higher for C. virgo, which has an exaggerated degree of wing melanization, than it was for the less exaggerated, sympatric congener C. splendens. Selective predation on the exaggerated species C. virgo favored a reduction and redistribution of the wing melanin patch. There was evidence for nonlinear selection involving wing patch size, wing patch darkness, and wing length and width in C. splendens but weaker nonlinear selection on the same trait combinations in C. virgo. Selective predation could interfere with species divergence by sexual selection and may thus indirectly affect male interspecific interactions, reproductive isolation, and species coexistence in this genus.},
  author       = {Svensson, Erik and Friberg, Magne},
  issn         = {0003-0147},
  keyword      = {reproductive isolation,interspecific competition,correlational selection,indirect effects,speciation,species interactions},
  language     = {eng},
  number       = {1},
  pages        = {101--112},
  publisher    = {University of Chicago Press},
  series       = {American Naturalist},
  title        = {Selective predation on wing morphology in sympatric damselflies},
  url          = {http://dx.doi.org/10.1086/518181},
  volume       = {170},
  year         = {2007},
}