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Tactical dimorphism : the interplay between body shape and mating behaviour in the swordtail Xiphophorus multilineatus (Cyprinodontiformes: Poeciliidae)

Liotta, Melissa N LU ; Abbott, Jessica K LU ; Rios-Cardenas, Oscar LU and Morris, Molly R (2019) In Biological Journal of the Linnean Society 127(2). p.337-350
Abstract
Alternative reproductive tactics (ARTs) are characterized by dimorphism for reproductive phenotypes (i.e. tactical dimorphism). Tactical dimorphism often evolves as a response to differing phenotypic optima for a shared reproductive trait between members of the same sex in a species. We characterized dimorphism for body shape between ARTs in the swordtail fish Xiphophorus multilineatus and investigated the relationship between body shape and mating behaviours. Xiphophorus multilineatus possesses two ARTs, a courter male that uses only courtship to attract females, and a sneaker male that is contextually plastic and uses both courtship and force copulatory sneak chases. We found that courter and sneaker males are dimorphic for body shape;... (More)
Alternative reproductive tactics (ARTs) are characterized by dimorphism for reproductive phenotypes (i.e. tactical dimorphism). Tactical dimorphism often evolves as a response to differing phenotypic optima for a shared reproductive trait between members of the same sex in a species. We characterized dimorphism for body shape between ARTs in the swordtail fish Xiphophorus multilineatus and investigated the relationship between body shape and mating behaviours. Xiphophorus multilineatus possesses two ARTs, a courter male that uses only courtship to attract females, and a sneaker male that is contextually plastic and uses both courtship and force copulatory sneak chases. We found that courter and sneaker males are dimorphic for body shape; however, we did not detect a significant difference in the allometric relationship between body shape and size. Additionally, we found that more fusiform sneaker males were more likely to use sneak-chase behaviour in the absence of a competitor. These results suggest that the ARTs in X. multilineatus have different phenotypic optima for body shape and that a fusiform body shape might be more optimal for sneak-chase behaviour. Understanding tactical dimorphism in this species will allow us to explore further how the ARTs evolved and the potential for intralocus tactical conflict to constrain the evolution of each ART from reaching their respective optima. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Biological Journal of the Linnean Society
volume
127
issue
2
pages
337 - 350
publisher
Linnean Society of London
ISSN
0024-4066
DOI
10.1093/biolinnean/blz053
language
English
LU publication?
yes
id
38e86288-e56e-48ac-87e5-274a502aed56
date added to LUP
2019-05-16 13:49:19
date last changed
2019-05-22 16:52:59
@article{38e86288-e56e-48ac-87e5-274a502aed56,
  abstract     = {Alternative reproductive tactics (ARTs) are characterized by dimorphism for reproductive phenotypes (i.e. tactical dimorphism). Tactical dimorphism often evolves as a response to differing phenotypic optima for a shared reproductive trait between members of the same sex in a species. We characterized dimorphism for body shape between ARTs in the swordtail fish Xiphophorus multilineatus and investigated the relationship between body shape and mating behaviours. Xiphophorus multilineatus possesses two ARTs, a courter male that uses only courtship to attract females, and a sneaker male that is contextually plastic and uses both courtship and force copulatory sneak chases. We found that courter and sneaker males are dimorphic for body shape; however, we did not detect a significant difference in the allometric relationship between body shape and size. Additionally, we found that more fusiform sneaker males were more likely to use sneak-chase behaviour in the absence of a competitor. These results suggest that the ARTs in X. multilineatus have different phenotypic optima for body shape and that a fusiform body shape might be more optimal for sneak-chase behaviour. Understanding tactical dimorphism in this species will allow us to explore further how the ARTs evolved and the potential for intralocus tactical conflict to constrain the evolution of each ART from reaching their respective optima.},
  author       = {Liotta, Melissa N and Abbott, Jessica K and Rios-Cardenas, Oscar and Morris, Molly R},
  issn         = {0024-4066},
  language     = {eng},
  month        = {04},
  number       = {2},
  pages        = {337--350},
  publisher    = {Linnean Society of London},
  series       = {Biological Journal of the Linnean Society},
  title        = {Tactical dimorphism : the interplay between body shape and mating behaviour in the swordtail Xiphophorus multilineatus (Cyprinodontiformes: Poeciliidae)},
  url          = {http://dx.doi.org/10.1093/biolinnean/blz053},
  volume       = {127},
  year         = {2019},
}