Genetic correlation in relation to differences in dosage of a stressor

J Evol Biol. 2011 Jan;24(1):219-23. doi: 10.1111/j.1420-9101.2010.02134.x.


We exposed the strains of Chlamydomonas isolated from an outbred laboratory population to a range of concentrations of salt (NaCl) up to an extirpative level that the base population could not tolerate. The genetic variance of yield increased with stress over the first half of this range before collapsing to nearly zero. The genetic correlation decreased with environmental distance, whether measured as a difference in dosage or as an environmental variance. This result is consistent with previous studies and provides a basis for interpreting adaptation to a deteriorating environment and the process of evolutionary rescue.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptation, Biological
  • Chlamydomonas / drug effects
  • Chlamydomonas / genetics*
  • Chlamydomonas / growth & development
  • Genetic Variation
  • Genotype
  • Sodium Chloride / pharmacology*
  • Stress, Physiological*


  • Sodium Chloride