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2001 The Society for the Study of Evolution. All rights reserved. Evolution, 55(10), 2001, pp. 20532069
 

Summary: 2053
2001 The Society for the Study of Evolution. All rights reserved.
Evolution, 55(10), 2001, pp. 20532069
CONDITION, GENOTYPE-BY-ENVIRONMENT INTERACTION, AND CORRELATIONAL
SELECTION IN LIZARD LIFE-HISTORY MORPHS
ERIK SVENSSON,1,2 BARRY SINERVO,1 AND TOSHA COMENDANT1
1Department of Ecology and Evolutionary Biology, Earth and Marine Sciences Building, University of California,
Santa Cruz, California 95064
Abstract. We compared reproductive allocation and variation in condition and survivorship of two heritable female
throat color morphs (orange and yellow) in a free-living population of side-blotched lizards (Uta stansburiana). Using
path analysis and structural equation modeling, we investigated how variation in the social environment affected
clutch size and egg mass and two condition traits (postlaying mass, immunological condition) and how these traits
in turn affected female field survival. In the presence of many neighbors, both morphs increased their clutch sizes,
although these effects were only significant in yellow females. In addition, yellow females increased their egg mass
in the presence of many orange neighbors. Orange females surrounded by many orange neighbors showed sign of
stress in the form of immunosuppression, whereas this effect was less pronounced in yellow females. The morphs
also differed in the impact of variation in clutch size and egg mass on both condition traits. Finally, female morphotype
and immune responsiveness affected fitness interactively, and hence these two traits showed signs of fitness epistasis:
Selection gradients on this trait were opposite in sign in the two morphs. The correlational selection gradient
( throat antibody response) between female throat color and antibody responsiveness was 0.365. Our data thus reveal

  

Source: Agrell, Jep - Department of Ecology, Lunds Universitet
Svensson, Erik - Department of Ecology, Lunds Universitet

 

Collections: Environmental Sciences and Ecology