Meta-analysis of geographical clines in desiccation tolerance of Indian drosophilids |
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Authors: | Subhash Rajpurohit Oldrich Nedved Allen G Gibbs |
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Institution: | 1. School of Life Sciences, University of Nevada, Las Vegas, NV 89154, USA;2. Faculty of Sciences, University of South Bohemia, Brani?ovská 31, 37005 ?eské Budějovice, Czech Republic;3. Institute of Entomology, Biology Centre of Academy of Sciences, Brani?ovská 31, 370 05 ?eské Budějovice, Czech Republic |
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Abstract: | Tropical fruit flies (Drosophilidae) differ from temperate drosophilids in several ecophysiological traits, such as desiccation tolerance. Moreover, many species show significant differences in desiccation tolerance across geographical populations. Fruit flies from the tropical and subtropical Indian subcontinent show a clinal pattern for desiccation tolerance which is similar for more than a dozen species studied so far, suggesting adaptation to climatic differences. We performed a meta-analysis to investigate which particular climatic patterns modulate desiccation tolerance in natural populations of drosophilids. Latitude of the sampling site explained most of the variability. Seasonal thermal amplitude (fluctuations in temperature expressed as coefficient of variation) was the strongest climatic factor shaping desiccation tolerance of flies, while factors measuring humidity directly were not important. Implications for survival of flies after future climate change are suggested. |
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