Document Detail


Clinal patterns of chromosomal inversion polymorphisms in Drosophila subobscura are partly associated with thermal preferences and heat stress resistance.
MedLine Citation:
PMID:  19744119     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Latitudinal clines in the frequency of various chromosomal inversions are well documented in Drosophila subobscura. Because these clines are roughly parallel on three continents, they have undoubtedly evolved by natural selection. Here, we address whether individuals carrying different chromosomal arrangements also vary in their thermal preferences (T(p)) and heat stress tolerance (T(ko)). Our results show that although T(p) and T(ko) were uncorrelated, flies carrying "cold-adapted" gene arrangements tended to choose lower temperatures in the laboratory or had a lower heat stress tolerance, in line with what could be expected from the natural patterns. Different chromosomes were mainly responsible for the underlying genetic variation in both traits, which explains why they are linearly independent. Assuming T(p) corresponds closely with temperatures that maximize fitness our results are consistent with previous laboratory natural selection experiments showing that thermal optimum diverged among thermal lines, and that chromosomes correlated with T(p) differences responded to selection as predicted here. Also consistent with data from the regular tracking of the inversion polymorphism since the colonization of the Americas by D. subobscura, we tentatively conclude that selection on tolerance to thermal extremes is more important in the evolution and dynamics of clinal patterns than the relatively "minor" adjustments from behavioral thermoregulation.
Authors:
Carla Rego; Joan Balany?; In?s Fragata; Margarida Matos; Enrico L Rezende; Mauro Santos
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-09-09
Journal Detail:
Title:  Evolution; international journal of organic evolution     Volume:  64     ISSN:  1558-5646     ISO Abbreviation:  Evolution     Publication Date:  2010 Feb 
Date Detail:
Created Date:  2010-02-23     Completed Date:  2010-06-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0373224     Medline TA:  Evolution     Country:  United States    
Other Details:
Languages:  eng     Pagination:  385-97     Citation Subset:  IM    
Affiliation:
Departament de Gen?tica i de Microbiologia, Grup de Biologia Evolutiva (GBE), Universitat Aut?noma de Barcelona, 08193 Bellaterra (Barcelona), Spain. CarlaJose.Azevedo@uab.cat
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological / genetics*
Animals
Chromosome Inversion*
Drosophila / genetics*,  physiology
Gene Rearrangement
Hot Temperature*
Polymorphism, Genetic*

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