LIFE HISTORY VARIATION IN AN ARTIFICIALLY SELECTED POPULATION OF DROSOPHILA MELANOGASTER: PLEIOTROPY, SUPERFLIES, AND AGE-SPECIFIC ADAPTATION

We measured age-specific fecundity and survival in recombinant inbred lines of Drosophila melanogaster that were derived from an artificial selection experiment for delayed reproduction. Age at peak oviposition is highly heritable (h² B = 0.55). We find three qualitative categories of peak ovipositi...

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Bibliographic Details
Published inEvolution Vol. 64; no. 12; pp. 3409 - 3416
Main Authors Khazaeli, Aziz A., Curtsinger, James W.
Format Journal Article
LanguageEnglish
Published Malden, USA Wiley Periodicals Inc 01.12.2010
Blackwell Publishing Inc
Oxford University Press
Subjects
Adaptation, Physiological
Age
Aging
Animal reproduction
Animals
Antagonistic pleiotropy
Biological Evolution
Crosses, Genetic
Drosophila
Drosophila melanogaster - genetics
Drosophila melanogaster - growth & development
Drosophila melanogaster - physiology
Evolution
Evolutionary genetics
Fecundity
fecundity schedule
Female
Female animals
Fertility
Genetic Pleiotropy
Genetic variation
Genetics
Genotype & phenotype
Genotypes
heritability
Inbred strains
Insects
Life span
Longevity
Male
Oviposition
recombinant inbred line
survival data
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Summary:We measured age-specific fecundity and survival in recombinant inbred lines of Drosophila melanogaster that were derived from an artificial selection experiment for delayed reproduction. Age at peak oviposition is highly heritable (h² B = 0.55). We find three qualitative categories of peak oviposition: early-, midlife-, and bimodal. Genetic correlations between life span and early fecundity are not significantly different from zero, but correlations with midlife fecundity are positive and statistically significant. Long-lived genotypes exhibit a midlife fecundity peak. There is no evidence for a shift of reproductive effort from early to later stages. The existence of qualitatively recombinant phenotypes, including "superflies" that exhibit both enhanced survival and high levels of early fecundity, argues against the widespread idea that life history evolution in Drosophila is dominated by negative pleiotropy. There is clear evidence of age-specific adaptation in the timing of oviposition.
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ISSN:0014-3820
1558-5646
DOI:10.1111/j.1558-5646.2010.01139.x