INVESTIGADORES
SOTO Ignacio Maria
artículos
Título:
Host use and developmental instability in the cactophilic sibling species Drosophila gouveai and D. antonietae
Autor/es:
SOTO IM; CARREIRA VP; CORIO C; SOTO, EM; HASSON, E
Revista:
ENTOMOLOGIA EXPERIMENTALIS ET APPLICATA
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Año: 2010 p. 165 - 175
ISSN:
0013-8703
Resumen:
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The Drosophila repleta group encompasses an ensemble of species that inhabit desertic areas that are inhospitable to other drosophilids. These species have a tractable ecology, as they breed and feed on necrotic tissues of Cactaceae making them suitable models to investigate the role of host plant shifts in diversification. Most species have their own primary host plant, which may be shared with a closely-related species. However, the consequences of host plant shifts from primary to secondary hosts have not been thoroughfully studied so far. We investigated the effects of the cactus host on developmental instability and performance of D. gouveai Tidon-Sklorz & Sene and D. antonietae Tidon-Sklorz & Sene (Diptera: Drosophilidae), a pair of closely-related sibling species, and of their F1 interspecific hybrids reared in primary and secondary host plants. Fluctuating asymmetry (FA) for wing size was significantly greater in flies of both species reared in their respective secondary cactus host than those grown in the primary host. Interspecific hybrids also exhibited host-dependent levels of FA. However, hybrids did not show greater FA than the parental species, suggesting that hybridization per se did not affect developmental stability. Even though cactus host shifts affected different measures of fitness (larval viability and adult size) both in D. antonietae and D. gouveai, we did not detect a consistent relationship between FA and fitness. Our results suggest that FA cannot be used as a sensitive indicator of genetic and phenotypic quality and we discuss its application.
