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Evolution. 1997 Aug;51(4):1079-1089. doi: 10.1111/j.1558-5646.1997.tb03955.x.

LOCAL ADAPTATION IN TWO SUBSPECIES OF AN ANNUAL PLANT: IMPLICATIONS FOR MIGRATION AND GENE FLOW.

Evolution; international journal of organic evolution

Eric S Nagy, Kevin J Rice

Affiliations

  1. Section of Evolution and Ecology, and Center for Population Biology, University of California, Davis, California, 95616.
  2. Department of Agronomy and Range Science, University of California, Davis, California, 95616.

PMID: 28565494 DOI: 10.1111/j.1558-5646.1997.tb03955.x

Abstract

Plant populations often adapt to local environmental conditions. Here we demonstrate local adaptation in two subspecies of the California native annual Gilia capitata using standard reciprocal transplant techniques in two sites (coastal and inland) over three consecutive years. Subspecies performance in each site was measured in four ways: probability of seedling emergence, early vegetative size (length of longest leaf), probability of flowering, and total number of inflorescences produced per plant. Analysis of three of the four variables demonstrated local adaptation through site-by-subspecies interactions in which natives outperformed immigrants. The disparity between natives and immigrants in their probability of emergence and probability of flowering was greater at the coastal site than at the inland site. Treated in isolation, these two fitness components suggest that migration from the coast to the inland site may be less restricted by selection than migration in the opposite direction. Two measurements of individual size (leaf length and number of inflorescences), suggest (though not strongly) that immigrants may be subject to weaker selection at the coastal site than at the inland site. A standard cohort life table is used to compare replacement rates (R

© 1997 The Society for the Study of Evolution.

Keywords: Cohort life table; Gilia; demography; density dependent; frequency dependent; gene flow; local adaptation; migration; reciprocal transplant

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