ovipositor morphology and host relations of the bactrocera tau complex (diptera: tephritidae) in thailand
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ID: 256091
2011
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Abstract
The taxon, Bactrocera tau, is a complex of fruit flies that infest fruits of many species in the family Cucurbitaceaeas well as fruits from very different plant families in southeast Asia. Past mitotic karyotype studies of B. tau flies from differentgeographic location- and/or host-associated populations indicate there are nine forms present within the taxon in Thailand,which have been designated as B. tau forms A to I. In this study, ovipositor morphology was compared among sevenmembers of the B. tau complex using scanning electron microscopy. The flies could be placed into two main groups based onthe shape of the aculeus apex. The first group comprised B. tau forms C and I which have trilobed aculeus apices. The secondgroup included B. tau forms A, D, E, F and G, all of which have single-pointed apices. The latter five forms were furtherdivided on the basis of the sharpness of the aculeus apex into “medium” (A and E), “sharp” (D and G) and “blunt” (F) apices.Host fruit associations, fly aculeus apex shape and geographical region were overlain onto a molecular phylogeny previouslypublished for the B. tau group in Thailand. Cucurbitaceae fruits appear to be ancestral hosts for the B. tau complex whereasthe use of fruits of other plant families appeared late in the evolutionary history of this group. Forms with trilobed and singlepointedaculeus apices separated early in B. tau evolutionary history, but the split does not seem host related. Flies withmedium, sharp and blunt, simple-pointed aculeus apices showed no evident associations, being randomly distributed acrossthe phylogenetic tree. Bactrocera tau form A which infested fruits of nine Cucurbitaceae species was found in all fivesurveyed regions, whereas each of the other forms, which were restricted to 1-3 fruit species, were found in 1-2 regions.
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sumrandee2011songklanakarinovipositor
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| Authors | ;Chalao Sumrandee;John R. Milne;Visut Baimai |
| Journal | ferroelectrics |
| Year | 2011 |
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