Patterns of variation in wing morphology in the cactophilic Drosophila buzzatii and its sibling D. koepferae
Drosophila buzzatii and D. koepferae are two sibling species that breed on the necrotic tissues of several cactus species and show a certain degree of niche overlap. Also, they show differences in several life history traits, such as body size and developmental time, which probably evolved as a cons...
| Autores: | , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2006 |
| País: | Argentina |
| Recursos: | Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales |
| Repositorio: | Biblioteca Digital (UBA-FCEN) |
| Idioma: | inglés |
| OAI Identifier: | paperaa:paper_1010061X_v19_n4_p1275_Carreira |
| Acesso em linha: | http://hdl.handle.net/20.500.12110/paper_1010061X_v19_n4_p1275_Carreira |
| Access Level: | acceso abierto |
| Palavra-chave: | Body size Cactophilic Drosophila Environmental heterogeneity Host plants Wing morphology variation adaptation body size breeding fly genetic variation heterogeneity host plant interspecific variation life cycle life history trait niche overlap sibling wing morphology animal article Drosophila forelimb histology morphogenesis species difference Animals Morphogenesis Species Specificity Wing Cactaceae Drosophila buzzatii Drosophila koepferae Opuntia Opuntia sulphurea Trichocereus terschekii |
| Resumo: | Drosophila buzzatii and D. koepferae are two sibling species that breed on the necrotic tissues of several cactus species and show a certain degree of niche overlap. Also, they show differences in several life history traits, such as body size and developmental time, which probably evolved as a consequence of adaptation to different host plants. In this work we investigate the ecological and genetic factors affecting wing morphology variation both within and between species. Three wing traits were scored, distal and proximal wing length and width in isofemale lines reared in two of the most important host cacti: Opuntia sulphurea and Trichocereus terschekii. Our results revealed that differences between species and sexes in wing size and shape were significant, whereas the cactus factor was only significant for wing size. Intraspecific analyses showed that differences among isofemale lines were highly significant for both size and shape in both species, suggesting that an important fraction of variation in wing morphology has a genetic basis. Moreover, the line by cactus interaction, which can be interpreted as a genotype by environment interaction, also accounted for a significant proportion of variation. In summary, our study shows that wing size is phenotypically plastic and that populations of D. buzzatii and D. koepferae harbour substantial amounts of genetic variation for wing size and shape. Interspecific differences in wing size and shape are interpreted in terms of spatial predictability of the different host plants in nature. © 2006 The Authors. |
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