| expression of cytoplasmic incompatibility in drosophila simulans and its impact on infection frequencies and distribution of wolbachia pipientis. | the aim of this study is to examine the expression of cytoplasmic incompatibility and investigate the distribution and population frequencies of wolbachia pipientis strains in drosophila simulans. nucleotide sequence data from 16s rdna and a wolbachia surface protein coding sequence and cytoplasmic incompatibility assays identify four distinct wolbachia strains: wha, wri, wma, and wau. the levels of cytoplasmic incompatibility between six lines carrying these strains of bacteria and three contro ... | 2000 | 11108593 |
| signature of selective sweep associated with the evolution of sex-ratio drive in drosophila simulans. | in several drosophila species, the xy mendelian ratio is disturbed by x-linked segregation distorters (sex-ratio drive). we used a collection of recombinants between a nondistorting chromosome and a distorting x chromosome originating from the seychelles to map a candidate sex-ratio region in drosophila simulans using molecular biallelic markers. our data were compatible with the presence of a sex-ratio locus in the 7f cytological region. using sequence polymorphism at the nrg locus, we showed t ... | 2004 | 15082554 |
| linking phylogenetics with population genetics to reconstruct the geographic origin of a species. | reconstructing ancestral geographic origins is critical for understanding the long-term evolution of a species. bayesian methods have been proposed to test biogeographic hypotheses while accommodating uncertainty in phylogenetic reconstruction. however, the problem that certain taxa may have a disproportionate influence on conclusions has not been addressed. here, we infer the geographic origin of drosophila simulans using 2,014 bp of the period locus from 63 lines collected from 18 countries. w ... | 2004 | 15288072 |
| organization of foraging behavior in larvae of cosmopolitan, widespread, and endemic drosophila species. | to explore the evolution of higher order behavioral traits we investigated the organization of foraging patterns in first instar larvae of natural populations of drosophila. we examined drosophila simulans (cosmopolitan); d. mauritania (widespread); d. pavani, and d. gaucha (endemic). larvae of these four species share the same behavior components that comprise foraging (locomotion, feeding, bending, and turning). d. simulans and d. mauritania larvae show uncoupled foraging patterns organized in ... | 2007 | 17394057 |
| high genetic differentiation between an african and a non-african strain of drosophila simulans revealed by segregation distortion and reduced crossover frequency. | drosophila simulans strains originating from madagascar and nearby islands in the indian ocean often differ from those elsewhere in the number of sex comb teeth and the degree of morphological anomaly in hybrids with d. melanogaster. here, we report a strong segregation distortion in the f1 intercross between two d. simulans strains originating from madagascar and the us, possibly at both the gametic and zygotic levels. strong bias against alleles of the madagascar strain was observed for all te ... | 2009 | 19590966 |