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Spatial scale and temporal component of selection in side-blotched lizards

Svensson, Erik LU and Sinervo, B (2004) In American Naturalist 163(5). p.726-734
Abstract
Spatial variation in selection has long been recognized as promoting population divergence and in maintaining genetic polymorphisms, but selection at a fine spatial scale is seldom measured directly. We analyzed spatial and temporal variation in selective regimes on egg size using long-term population data of the side-blotched lizard ( Uta stansburiana). Juvenile survival rates varied between years at a small spatial scale that was reflected as a strong interaction between the local neighborhood level and year. Spatially and temporally variable selection acted jointly on egg mass, which presumably would facilitate the maintenance of high additive genetic variance for this trait. Local selection gradients calculated at the neighborhood... (More)
Spatial variation in selection has long been recognized as promoting population divergence and in maintaining genetic polymorphisms, but selection at a fine spatial scale is seldom measured directly. We analyzed spatial and temporal variation in selective regimes on egg size using long-term population data of the side-blotched lizard ( Uta stansburiana). Juvenile survival rates varied between years at a small spatial scale that was reflected as a strong interaction between the local neighborhood level and year. Spatially and temporally variable selection acted jointly on egg mass, which presumably would facilitate the maintenance of high additive genetic variance for this trait. Local selection gradients calculated at the neighborhood level were significantly correlated with the annual global selection gradients calculated at the metapopulation level. However, there was substantial variance in these local selective regimes, which suggests that strong local selection could go undetected if the analysis was limited to the global level. We also investigated the degree of spatial synchronization among outcrop in local selection gradients. The degree of synchrony was higher among later-clutch hatchlings than among first-clutch hatchlings, and we suggest that more intense density- and frequency-dependent selection on egg size later in the season is responsible for this effect. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
competition, egg mass, frequency dependence, polymorphism
in
American Naturalist
volume
163
issue
5
pages
726 - 734
publisher
University of Chicago Press
external identifiers
  • wos:000221651400009
  • scopus:2642551628
ISSN
0003-0147
DOI
10.1086/383592
language
English
LU publication?
yes
id
fce61501-e7ba-4d1e-8bb9-ecc889d6d028 (old id 136992)
alternative location
http://www.journals.uchicago.edu/doi/pdf/10.1086/383592
date added to LUP
2008-11-06 13:24:44
date last changed
2017-11-19 03:37:04
@article{fce61501-e7ba-4d1e-8bb9-ecc889d6d028,
  abstract     = {Spatial variation in selection has long been recognized as promoting population divergence and in maintaining genetic polymorphisms, but selection at a fine spatial scale is seldom measured directly. We analyzed spatial and temporal variation in selective regimes on egg size using long-term population data of the side-blotched lizard ( Uta stansburiana). Juvenile survival rates varied between years at a small spatial scale that was reflected as a strong interaction between the local neighborhood level and year. Spatially and temporally variable selection acted jointly on egg mass, which presumably would facilitate the maintenance of high additive genetic variance for this trait. Local selection gradients calculated at the neighborhood level were significantly correlated with the annual global selection gradients calculated at the metapopulation level. However, there was substantial variance in these local selective regimes, which suggests that strong local selection could go undetected if the analysis was limited to the global level. We also investigated the degree of spatial synchronization among outcrop in local selection gradients. The degree of synchrony was higher among later-clutch hatchlings than among first-clutch hatchlings, and we suggest that more intense density- and frequency-dependent selection on egg size later in the season is responsible for this effect.},
  author       = {Svensson, Erik and Sinervo, B},
  issn         = {0003-0147},
  keyword      = {competition,egg mass,frequency dependence,polymorphism},
  language     = {eng},
  number       = {5},
  pages        = {726--734},
  publisher    = {University of Chicago Press},
  series       = {American Naturalist},
  title        = {Spatial scale and temporal component of selection in side-blotched lizards},
  url          = {http://dx.doi.org/10.1086/383592},
  volume       = {163},
  year         = {2004},
}