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Selection on space use in a polymorphic lizard

Olsson, Mats; Wapstra, Erik; Healey, Mo; Schwartz, Tonia and Uller, Tobias LU (2008) In Evolutionary Ecology Research 10(4). p.621-627
Abstract
Background: Polymorphism within the same species, population, and sex is an interesting problem for the evolutionary biologist, since differences in fitness between the morphs have to cancel out over evolutionary time, otherwise morphs of lower fitness would become extinct. One way this may be achieved is through the adoption of different morph-specific reproductive strategies, allowing morphs to become conditional specialists in space (co-existing) or in time (and cycle in frequency). In either case, we expect selection to be disruptive on data pooled across morphs.



Question: In the annual Australian painted dragon lizard (Ctenophorus pictus; less than 10% survive to a second year), red males dominate yellow males in... (More)
Background: Polymorphism within the same species, population, and sex is an interesting problem for the evolutionary biologist, since differences in fitness between the morphs have to cancel out over evolutionary time, otherwise morphs of lower fitness would become extinct. One way this may be achieved is through the adoption of different morph-specific reproductive strategies, allowing morphs to become conditional specialists in space (co-existing) or in time (and cycle in frequency). In either case, we expect selection to be disruptive on data pooled across morphs.



Question: In the annual Australian painted dragon lizard (Ctenophorus pictus; less than 10% survive to a second year), red males dominate yellow males in staged contests, and yellow males (sneakers) are superior in sperm competition trials. Here, we ask whether there is ongoing disruptive selection for red males to defend well-defined, smaller territories (dominants) and for yellow males to have larger, more loosely defined territories (sneakers).



Methods: We monitored free-ranging lizards in a natural population, assigned paternity using microsatellites, and calculated selection coefficients to assess ongoing sexual directional and quadratic selection on territory size.



Results and conclusions: Despite the different reproductive strategies, selection on space use in a natural population was not disruptive in either of the two years studied. Instead, there was no difference in. territory size between morphs, and in one year there was ongoing directional (positive) and quadratic (stabilizing) selection on territory size applying across both morphs. Thus, divergence of male reproductive strategies in C pictus does not seem to be related to differences in space use. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Evolutionary Ecology Research
volume
10
issue
4
pages
621 - 627
publisher
Evolutionary Ecology Ltd
external identifiers
  • Scopus:47549092032
ISSN
1522-0613
language
English
LU publication?
no
id
a3a1eaef-d55f-4f8f-b11d-818d920afb42 (old id 4731554)
date added to LUP
2014-11-11 11:38:43
date last changed
2016-10-13 04:27:29
@misc{a3a1eaef-d55f-4f8f-b11d-818d920afb42,
  abstract     = {Background: Polymorphism within the same species, population, and sex is an interesting problem for the evolutionary biologist, since differences in fitness between the morphs have to cancel out over evolutionary time, otherwise morphs of lower fitness would become extinct. One way this may be achieved is through the adoption of different morph-specific reproductive strategies, allowing morphs to become conditional specialists in space (co-existing) or in time (and cycle in frequency). In either case, we expect selection to be disruptive on data pooled across morphs. <br/><br>
<br/><br>
Question: In the annual Australian painted dragon lizard (Ctenophorus pictus; less than 10% survive to a second year), red males dominate yellow males in staged contests, and yellow males (sneakers) are superior in sperm competition trials. Here, we ask whether there is ongoing disruptive selection for red males to defend well-defined, smaller territories (dominants) and for yellow males to have larger, more loosely defined territories (sneakers). <br/><br>
<br/><br>
Methods: We monitored free-ranging lizards in a natural population, assigned paternity using microsatellites, and calculated selection coefficients to assess ongoing sexual directional and quadratic selection on territory size. <br/><br>
<br/><br>
Results and conclusions: Despite the different reproductive strategies, selection on space use in a natural population was not disruptive in either of the two years studied. Instead, there was no difference in. territory size between morphs, and in one year there was ongoing directional (positive) and quadratic (stabilizing) selection on territory size applying across both morphs. Thus, divergence of male reproductive strategies in C pictus does not seem to be related to differences in space use.},
  author       = {Olsson, Mats and Wapstra, Erik and Healey, Mo and Schwartz, Tonia and Uller, Tobias},
  issn         = {1522-0613},
  language     = {eng},
  number       = {4},
  pages        = {621--627},
  publisher    = {ARRAY(0xaa17350)},
  series       = {Evolutionary Ecology Research},
  title        = {Selection on space use in a polymorphic lizard},
  volume       = {10},
  year         = {2008},
}