INVESTIGADORES
FOLGUERA Guillermo
artículos
Título:
Genotype by environment interactions in viability and developmental time in populations of cactophilic Drosophila
Autor/es:
FANARA, J. J.; FOLGUERA, G.; IRIARTE, P. F.; MENSCH, J.; HASSON, E.
Revista:
JOURNAL OF EVOLUTIONARY BIOLOGY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: West Sussex, Inglaterra; Año: 2006 vol. 19 p. 900 - 908
ISSN:
1010-061X
Resumen:
The genetic and ecological basis of viability and developmental time
differences between Drosophila buzzatii and D. koepferae were analysed using
the isofemale line technique. Several isofemale lines were sampled from pairs
of allopatric/sympatric populations of each species. Flies were reared in media
prepared with decaying tissues of two of the main natural cactus hosts of each
species. This experimental design enabled us to evaluate the relative
contribution of phenotypic plasticity, genetic variation and genotype by
environment interaction (G · E) to total phenotypic variation for two fitness
traits, viability and developmental time. Our results revealed significant G · E
in both traits, suggesting that the maintenance of genetic variation can be
explained, at least in part, by diversifying selection in different patches of a
heterogeneous environment in both species. However, the relative importance
of the factors involved in the G · E varied between traits and populations
within species. For viability, the G · E can be mainly attributed to changes in
the rank order of lines across cacti. However, the pattern was different for
developmental time. In D. buzzatii the G · E can be mainly accounted for by
changes in among line variance across cacti, whereas changes in the rank
order of lines across cacti was the main component in D. koepferae. These
dissimilar patterns of variation between traits and species suggest that the
evolutionary forces shaping genetic variation for developmental time and
viability vary between populations within species and between species.