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Geometric Morphometrics of Drosophila melanogaster Wing Venation: Population Monitoring of Diptera for Pest Management and Pollination Ecology of Jatropha curcas
Researcher : B. Juliandi
Published : 2007
Group :Agriculture
Full Report : Special request
Abstract :
Insects population monitoring in Jatropha curcas plantation is urgently needed, because several insects ordo have an important roles to the plants. One of the ordo is Diptera, which is known for its capability to act as a parasitoid and polinator in J. curcas plantation. Sadly, the manual monitoring process is consuming a lot of resources and need some entomological experiences. Therefore, an automated process must be devised. This research was conducted to develop basic knowledge of variation in wing venation of one of the well known fruit flies from ordo Diptera, Drosophila melanogaster, using two geometric morphometrics tools named Thin-plate Spline and Generalized Procrustes Analysis. This basis were compared to Musa domestica, a house flies trapped around Jatropha curcas plantation. Size and shape of wing venation of D. melanogaster found to have variation. Wing size in female was larger than male. In male, left wing was larger than the right wing, while in female right wing was larger than the left one. Landmarks with the highest variances value were intersection of vein C with R2+3,branching points of veins R2+3 and R4+5, intersection of vein M3+4 with wing margin, and branching points of veins R1 and Rs ( base of R2+3 and R4+5). The affine components variations were at proximal-distal direction, while the non affine components variations were summarized by relative warps 1 (RW1) with 94,94% proportion of total variance. The variation between breeding bottle of D.melanogaster was low, due to the same parental origin. But, with the shape relationship analysis employed in this research, the separation of breeding according to its shape was successfully conducted. Wing size of M. domestica was larger than the D. melanogaster. Right wing was larger than the left wing. Variation in wing venation shape between these two species in affine components were at proximal-distal direction, and the non affine components were summarized by RW1 with 99,94% proportion of total variance. Based on available size and shape descriptors, the two species were successfully differentiated in this research.