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

Author:
  • Erik Svensson
  • B Sinervo
Publishing year: 2004
Language: English
Pages: 726-734
Publication/Series: American Naturalist
Volume: 163
Issue: 5
Document type: Journal article
Publisher: University of Chicago Press

Abstract english

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.

Keywords

  • Biological Sciences
  • competition
  • egg mass
  • frequency dependence
  • polymorphism

Other

Published
  • ISSN: 0003-0147
erik_svensson
E-mail: erik.svensson [at] biol.lu.se

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Evolutionary ecology

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Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
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