Altitudinal patterns for longevity, fecundity and senescence in Drosophila buzzatii |
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Authors: | F M Norry P Sambucetti A C Scannapieco V Loeschcke |
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Institution: | (1) Departamento de Ecología y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, (C-1428-EHA) Buenos Aires, Argentina;(2) Department of Ecology and Genetics, University of Aarhus, Ny Munkegade, Bldg. 540, DK-8000 Aarhus C, Denmark |
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Abstract: | We tested for variation in longevity, senescence rate and early fecundity of Drosophila buzzatii along an elevational transect in Argentina, using laboratory-reared flies in laboratory tests performed to avoid extrinsic
mortality. At 25 °C, females from lowland populations lived longer and had a lower demographic rate of senescence than females
from highland populations. Minimal instead of maximal temperature at the sites of origin of population best predicted this
cline. A very different pattern was found at higher test temperature. At 29.5 °C, longevity of males increased with altitude
of origin of population. No clinal trend was apparent for longevity of females at 29.5 °C. There was evidence for a trade-off
between early fecundity and longevity at non-stressful temperature (25 °C) along the altitudinal gradient. This trait association
is consistent with evolutionary theories of aging. Population-by-temperature and sex-by-temperature interactions indicate
that senescence patterns are expressed in environment specific ways. |
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Keywords: | Drosophila early fecundity elevational gradient population-by-temperature interaction senescence rate sex-specific variation |
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