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Abstract:

Thermal environments can influence many fitness-related traits including life span. Here, we assess whether longevity in Drosophila melanogaster can experimentally evolve as a correlated response to cold-stress selection, and whether genotype-by-temperature and sex-by-temperature interactions are significant components of variation in life span. Three replicated S lines were cold-stress selected and compared with their respective unselected controls (C lines) in the 16th generation of thermal selection. Cold-stress resistance exhibited a substantial direct response to selection, and also showed a significant interaction between sex and type of line. Mean longevity exhibited a significant interaction between adult test temperature (14 and 25°C) and line (with suggestive evidence for increased longevity of S lines when tested at 14°C), but there was no evidence for increased longevity in S lines at normal temperatures (i.e. 25°C). Another temperature-dependent effect was sex-specific, with males being the longer lived sex at 25°C but the less long-lived sex at 14°C. Additionally, we tested in an exploratory way the relationship between longevity and cold-stress resistance by also measuring resistance to a prefreezing temperature before and after one generation of longevity selection at 14°C (selection intensity, i = 1.47 for S lines, and 1.42 for C lines). In this longevity selection, we found that cold-stress resistance increased by about 6% in S lines and 18% in C lines. However, taken together, the results indicate no simple relationship between longevity and cold-stress resistance, with genotype-by-sex interactions in both traits. Temperature dependent interaction in longevity is apparent between S and C lines, and sex-specific variation in mean longevity also depends on temperature.

Registro:

Documento: Artículo
Título:Longevity and resistance to cold stress in cold-stress selected lines and their controls in Drosophila melanogaster
Autor:Norry, F.M.; Loeschcke, V.R.
Filiación:Department of Ecology and Genetics, University of Aarhus, Aarhus C, Denmark
Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Department of Ecology and Genetics, University of Aarhus, Ny Munkegade Buildg. 540, DK-8000 Aarhus C, Denmark
Palabras clave:Cold-stress resistance; Correlated responses; Drosophila melanogaster; Gene-by-temperature interaction; Longevity; Sex-specificity; adaptation; cold tolerance; longevity; selection; Diptera; Drosophila melanogaster; Drosophilidae; Melanogaster
Año:2002
Volumen:15
Número:5
Página de inicio:775
Página de fin:783
DOI: http://dx.doi.org/10.1046/j.1420-9101.2002.00438.x
Título revista:Journal of Evolutionary Biology
Título revista abreviado:J. Evol. Biol.
ISSN:1010061X
CODEN:JEBIE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1010061X_v15_n5_p775_Norry

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Citas:

---------- APA ----------
Norry, F.M. & Loeschcke, V.R. (2002) . Longevity and resistance to cold stress in cold-stress selected lines and their controls in Drosophila melanogaster. Journal of Evolutionary Biology, 15(5), 775-783.
http://dx.doi.org/10.1046/j.1420-9101.2002.00438.x
---------- CHICAGO ----------
Norry, F.M., Loeschcke, V.R. "Longevity and resistance to cold stress in cold-stress selected lines and their controls in Drosophila melanogaster" . Journal of Evolutionary Biology 15, no. 5 (2002) : 775-783.
http://dx.doi.org/10.1046/j.1420-9101.2002.00438.x
---------- MLA ----------
Norry, F.M., Loeschcke, V.R. "Longevity and resistance to cold stress in cold-stress selected lines and their controls in Drosophila melanogaster" . Journal of Evolutionary Biology, vol. 15, no. 5, 2002, pp. 775-783.
http://dx.doi.org/10.1046/j.1420-9101.2002.00438.x
---------- VANCOUVER ----------
Norry, F.M., Loeschcke, V.R. Longevity and resistance to cold stress in cold-stress selected lines and their controls in Drosophila melanogaster. J. Evol. Biol. 2002;15(5):775-783.
http://dx.doi.org/10.1046/j.1420-9101.2002.00438.x