Martin, F.D.Ecology2010-02-152010-02-151968http://hdl.handle.net/1969.3/20596p. 1186-1188.Three populations of Cyprinodon variegatus Lacepede were compared as to their abilities to withstand sudden osmotic shocks. A population from an area having large daily and seasonal changes in salinity showed a much greater tolerance than two populations from more stable environments. This difference in ability seems to be largely due to factors experienced during ontogeny and rearing of the individuals tested.salinity gradientsCyprinodon variegatusosmotic adaptationsintraspecific variationspecies diversityArticle