| an anomalous hybrid zone in drosophila. | despite the genetic tractability of many of drosophila species, the genus has few examples of the "classic" type of hybrid zone, in which the ranges of two species overlap with a gradual transition from one species to another through an area where hybrids are produced. here we describe a classic hybrid zone in drosophila that involves two sister species, drosophila yakuba and d. santomea, on the island of são tomé. our transect of this zone has yielded several surprising and anomalous findings. ... | 2005 | 16526507 |
| conspecific sperm precedence in sister species of drosophila with overlapping ranges. | barriers to gene flow that act after mating but before fertilization are often overlooked in studies of reproductive isolation. where species are sympatric, such "cryptic" isolating barriers may be important in maintaining species as distinct entities. drosophila yakuba and its sister species d. santomea have overlapping ranges on the island of são tomé, off the coast of west africa. previous studies have shown that the two species are strongly sexually isolated. however, the degree of sexual is ... | 2004 | 15154554 |
| evolutionary novelties in islands: drosophila santomea, a new melanogaster sister species from são tomé. | the finding of new melanogaster sister species may help us in understanding more about how the emergence of genetic novelties, particularly in insular habitats, can result in speciation. here we report on the discovery of drosophila santomea, which is the first melanogaster sibling found off west-equatorial africa, on são tomé, one of the gulf of guinea islands. although the eight other melanogaster sister species are remarkably conservative in their morphology except for their terminalia, the n ... | 2000 | 11007323 |