Volume 52, Issue 3 pp. 825-831
Article
Free Access

DESICCATION AND STARVATION TOLERANCE OF ADULT DROSOPHILA: OPPOSITE LATITUDINAL CLINES IN NATURAL POPULATIONS OF THREE DIFFERENT SPECIES

Dev Karan

Dev Karan

Department of Biosciences, Maharshi Dayanand University, Rohtak, 124 001 India

The first two authors contributed equally to this manuscript.Search for more papers by this author
Neena Dahiya

Neena Dahiya

Department of Biosciences, Maharshi Dayanand University, Rohtak, 124 001 India

The first two authors contributed equally to this manuscript.Search for more papers by this author
Ashok K. Munjal

Ashok K. Munjal

Department of Biosciences, Maharshi Dayanand University, Rohtak, 124 001 India

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Patricia Gibert

Patricia Gibert

Laboratoire Populations, Génétique et Evolution, CNRS, 91198 Gif sur Yvette Cedex, France

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Brigitte Moreteau

Brigitte Moreteau

Laboratoire Populations, Génétique et Evolution, CNRS, 91198 Gif sur Yvette Cedex, France

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Ravi Parkash

Ravi Parkash

Department of Biosciences, Maharshi Dayanand University, Rohtak, 124 001 India

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Jean R. David

Jean R. David

Laboratoire Populations, Génétique et Evolution, CNRS, 91198 Gif sur Yvette Cedex, France

Corresponding author.Search for more papers by this author
First published: 31 May 2017
Citations: 54

Abstract

Desiccation and starvation tolerance were measured along latitudinal transects in three Drosophilid species (Drosophila ananassae, D. melanogaster, and Zaprionus indianus) of the Indian subcontinent. In each case, significant latitudinal clines were observed; desiccation tolerance increased with latitude while starvation tolerance decreased. Such field observations suggest that desiccation and starvation tolerance are fitness related traits that are independently selected in nature and genetically independent. It was, however, difficult to relate these genetic changes with precise climatic variables, except winter temperature. The overall negative correlation between the two traits, which was evidenced in natural populations, contrasts with a positive correlation generally observed in various laboratory selection experiments and that also seems to exist between different species. These observations point to the difficulty of interpreting correlations among fitness-related traits when different evolutionary levels are compared, and also different sets of data, that is, field versus laboratory studies.

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