Molecular systematics and wing morphometric variation in species of the Drosophila tripunctata radiation / Sistematica molecular e variação morfometrica da asa de especies de Drosophila da radiação tripunctata

AUTOR(ES)

Luciane Mendes Hatadani

DATA DE PUBLICAÇÃO

2007

RESUMO

The tripunctata group is the second largest Neotropical group of Drosophila in number of species and was included in the tripunctata radiation – which comprises other closely related groups. The second chromosome of Drosophila mediopunctata (a species that belongs to the tripunctata group) is highly polymorphic for inversions. Previous work suggested the presence of genotype-environment interaction for wing size but not for shape. We performed experiments in the laboratory to test for the joint effects of temperature and chromosome inversions on size and shape of the wing in D. mediopunctata. Wing morphology was analyzed by methods of geometric morphometrics. Our findings show that wing size and shape are influenced by temperature, sex, and karyotype. We also found evidence suggestive of an interaction between the effects of karyotype and temperature on wing shape (but not for size), indicating the existence of genotype-environment interaction for wing shape in D. mediopunctata. We suggest that other ecological factors – such as larval crowding – or seasonal variation of genetic content within inversions may explain the previous results. Moreover, we suggest a new phylogenetic hypothesis for the tripunctata radiation based on sequences of mitochondrial genes of cytochrome oxidase subunits I and II, and describe wing size and shape variation in different species based on this new phylogenetic hypothesis. Phylogenetic trees were reconstructed by parsimony, maximum likelihood and bayesian inference. Results reject the monophyly hypothesis for the tripunctata group whereas monophyly is not rejected for the tripunctata radiation and other specific groups within the radiation. Both wing size and shape displayed phylogenetic signal and different patterns of size and shape could be identified for each of the most important clusters detected by phylogenetic analysis.

ASSUNTO(S)

filogenia body temperature corpo - temperatura chromosome inversion drosophila inversão cromossomica phylogeny asas wings drosofila

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