نتایج جستجو برای: new subspecies
تعداد نتایج: 1859749 فیلتر نتایج به سال:
The draft genome sequences from two subspecies of rice are powerful new tools for gene discovery in the grasses. Genome-wide comparisons of gene content and order will also shed new light on evolutionary processes.
the barn owl, tyto alba (scopoli, 1769), occurs worldwide and shows a considerable amount of morphological and geographical variation, leading to the recognition of many subspecies around the world. yet comprehensive study on this species needs to be done. data from mitochondrial gene (cytb) with 620bp length is analyzed for 30 individuals around the world. maximum likelihood (ml), maximum pars...
Theory predicts that biogeographic factors should play a central role in promoting population divergence and speciation. Previous empirical studies into biogeography and diversification have been relatively restricted in terms of the geographical area, phylogenetic scope, and the range of biogeographic factors considered. Here we present a global analysis of allopatric phenotypic divergence (me...
Tigers (Panthera tigris) are disappearing rapidly from the wild, from over 100,000 in the 1900s to as few as 3000. Javan (P.t. sondaica), Bali (P.t. balica), and Caspian (P.t. virgata) subspecies are extinct, whereas the South China tiger (P.t. amoyensis) persists only in zoos. By contrast, captive tigers are flourishing, with 15,000-20,000 individuals worldwide, outnumbering their wild relativ...
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