See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/26802408
Clinal patterns of chromosomal inversion polymorphism in Drosophila subobscura are partly associated with thermal preferences and heat stress resistance
Article in Evolution · October 2009 DOI: 10.1111/j.1558-5646.2009.00835.x · Source: PubMed
CITATIONS READS 51 78
6 authors, including:
Carla Rego Joan Balanya University of the Azores University of Barcelona
208 PUBLICATIONS 622 CITATIONS 47 PUBLICATIONS 1,418 CITATIONS
SEE PROFILE SEE PROFILE
Inês Fragata Margarida Matos University of Lisbon University of Lisbon
66 PUBLICATIONS 386 CITATIONS 98 PUBLICATIONS 1,023 CITATIONS
SEE PROFILE SEE PROFILE
Some of the authors of this publication are also working on these related projects:
Fauna Entomológica dos Açores View project
Arthropod diversity of Madeira Island View project
All content following this page was uploaded by Mauro Santos on 11 October 2017.
The user has requested enhancement of the downloaded file. ORIGINAL ARTICLE
doi:10.1111/j.1558-5646.2009.00835.x
CLINAL PATTERNS OF CHROMOSOMAL INVERSION POLYMORPHISMS IN DROSOPHILA SUBOBSCURA ARE PARTLY ASSOCIATED WITH THERMAL PREFERENCES AND HEAT STRESS RESISTANCE
Carla Rego,1,2 Joan Balanya,` 3,4 Inesˆ Fragata,5,6 Margarida Matos,5,7 Enrico L. Rezende,1,8 and Mauro Santos1,9,10 1Departament de Genetica` i de Microbiologia, Grup de Biologia Evolutiva (GBE), Universitat Autonoma` de Barcelona, 08193 Bellaterra (Barcelona), Spain 2E-mail: [email protected] 3Departament de Genetica,` Grup de Biologia Evolutiva (GBE), Facultat de Biologia, Universitat de Barcelona, Diagonal 645, 08071 Barcelona, Spain 4E-mail: [email protected] 5Centro de Biologia Ambiental, Departamento de Biologia Animal, Faculdade de Cienciasˆ da Universidade de Lisboa, 1749-016 Lisbon, Portugal 6E-mail: [email protected] 7E-mail: [email protected] 8E-mail: [email protected] 9E-mail: [email protected]
Received June 11, 2009 Accepted August 24, 2009
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.
KEY WORDS: Adaptation, chromosomal polymorphisms, latitudinal variation, stress tolerance, thermoregulation.
10Corresponding author.