The interplay between thermal tolerance and life history is associated with the biogeography of <i>Drosophila</i> species
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Date
2010
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Abstract
Background: Physiological tolerances are important determinants of the biogeography of species.
Questions: What is the relationship between thermal tolerance and the biogeographic origin of species? What are the relationships between thermal tolerance and life-history traits?
Organisms: Four Drosophila species, two from a tropical biogeographic area (I), melanogaster and D. simulans) and two from a temperate geographic zone in the Andes mountains (D. pavani and 1). gaucha).
Methods: We assessed upper and lower lethal temperature. We used thermal limits to construct a thermal tolerance polygon that represents the total thermal range of each species after acclimation at different ambient temperatures. We also measured difference, in life history (fertility and egg-to-adult viability) between species.
Conclusions: Both temperate species have broader thermal tolerance ranges than either tropical species. But temperate species have lower fitness at higher temperature, than tropical species, and both of them have low fitness at lower temperatures.
Questions: What is the relationship between thermal tolerance and the biogeographic origin of species? What are the relationships between thermal tolerance and life-history traits?
Organisms: Four Drosophila species, two from a tropical biogeographic area (I), melanogaster and D. simulans) and two from a temperate geographic zone in the Andes mountains (D. pavani and 1). gaucha).
Methods: We assessed upper and lower lethal temperature. We used thermal limits to construct a thermal tolerance polygon that represents the total thermal range of each species after acclimation at different ambient temperatures. We also measured difference, in life history (fertility and egg-to-adult viability) between species.
Conclusions: Both temperate species have broader thermal tolerance ranges than either tropical species. But temperate species have lower fitness at higher temperature, than tropical species, and both of them have low fitness at lower temperatures.
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Keywords
acclimation, biogeography, Drosophila, life history, thermal tolerances polygons