LOCAL INTROGRESSION BETWEEN VIOLA CUCULLATA AIT. AND V. SEPTENTRIONALIS GREENE

VIOLA: video on local area networks

We describe a network system architecture called VIOLA (Video-on-LANs) for on-damand video distribution services on a local area network. The architecture makes use of a switched-network topology and distributed video servers, which together allow the system to be scalable from tens to thousands of users. We propose a Buffered Datagram Layer (BDL) for shielding underlying network dependencies, ...

Mitochondrial introgression and replacement between yellowhammers (

In studies of phylogeography and taxonomy, strong emphasis is usually placed on the study of mitochondrial DNA (mtDNA). Here we present a remarkable case in which highly phenotypically divergent species have almost no divergence in mtDNA. Yellowhammers (Emberiza citrinella Linnaeus) and pine buntings (E. leucocephalos S. G. Gmelin) differ noticeably in appearance and song but hybridize in some ...

Speciation and Introgression between Mimulus nasutus and Mimulus guttatus

Mimulus guttatus and M. nasutus are an evolutionary and ecological model sister species pair differentiated by ecology, mating system, and partial reproductive isolation. Despite extensive research on this system, the history of divergence and differentiation in this sister pair is unclear. We present and analyze a population genomic data set which shows that M. nasutus budded from a central Ca...

The hidden side of invasions: massive introgression by local genes.

Despite hundreds of reports involving both plants and animals, the mechanisms underlying introgression remain obscure, even if some form of selection is frequently invoked. Introgression has repeatedly been reported in species that have recently colonized a new habitat, suggesting that demographic processes should be given more attention for understanding the mechanisms of introgression. Here w...

Harry S.N. Greene, M.D.