Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Thoracic trident pigmentation in Drosophila melanogaster: latitudinal and altitudinal clines in Indian populations | Genet Sei Evol 1997 29 601-610 @ Elsevier Inra 601 Original article Thoracic trident pigmentation in Drosophila melanogaster latitudinal and altitudinal clines in Indian populations AK Munjal1 D Karan1 p Gibert2 B Moreteau2 R Parkash 1 JR David2 1 Department of Biosciences Maharshi Dayanand University Rohtak 124001 India 2 Laboratoire populations génétique evolution Centre national de la recherche scientifique 91198 Gif-sur-Yvette France Received 21 April 1997 accepted 18 July 1997 Summary - Wild populations of Drosophila melanogaster were collected along a latitudinal transect between Ernaculum 10 latitude and Jammu . Altitudes were also highly variable from sea level up to more than 2 000 m. The intensity of dark pigmentation on the thorax trident was estimated visually using four phenotypic classes in flies grown at 17 and 25 C. Significant clines of increasing pigmentation were observed according to latitude and altitude. A multiple regression technique permitted improvement of the relationship between pigmentation and geographic parameters so that 93 of the pigmentation variations among populations could be predicted by knowing both the latitude and altitude of original populations. These data strongly suggest an adaptive response of thoracic pigmentation to physical factors of the environment and especially to temperature. temperature adaptation latitude altitude multiple regression body pigmentation Resume - La pigmentation du trident thoracique chez Drosophila melanogaster clines de latitude et d altitude dans les populations indiennes. Des populations naturelies de Drosophila melanogaster ont été collectées selon un transect latitudinal compris entre Ernaculum 10 de latitude et Jammu 32 4 . Les altitudes étaient également très variables allant du niveau de la mer jusqu à plus de 2 000 m. L intensité de la pigmentation sombre du thorax trident a été estimée visuellement en utilisant quatre classes phénotypiques chez des mouches élevées à 17 et à 25 c.
