988 resultados para ESTABLISHED POPULATIONS
Resumo:
The pathways for academic career and employment program (PACE) is established to provide funding to community colleges for the development of projects that will lead to gainful, quality, in-state employment for members of target populations by providing them with both effective academic and employment training to ensure gainful employment and customized support services.
Resumo:
Connectivity among populations plays a crucial role in maintaining genetic variation at a local scale, especially in small populations affected strongly by genetic drift. The negative consequences of population disconnection on allelic richness and gene diversity (heterozygosity) are well recognized and empirically established. It is not well recognized, however, that a sudden drop in local effective population size induced by such disconnection produces a temporary disequilibrium in allelic frequency distributions that is akin to the genetic signature of a demographic bottleneck. To document this effect, we used individual-based simulations and empirical data on allelic richness and gene diversity in six pairs of isolated versus well-connected (core) populations of European tree frogs. In our simulations, population disconnection depressed allelic richness more than heterozygosity and thus resulted in a temporary excess in gene diversity relative to mutation drift equilibrium (i.e., signature of a genetic bottleneck). We observed a similar excess in gene diversity in isolated populations of tree frogs. Our results show that population disconnection can create a genetic bottleneck in the absence of demographic collapse.
Resumo:
The objective of this work was to characterize the populations of Gossypium barbadense in the states of Amapá and Pará, Brazil. In situ characterization was conducted through interviews with the owners of the plants and environmental observations. Leaf or petal tissue as well as seed samples were collected for genetic characterization by single sequence repeats markers and for storage in germplasm banks, respectively. The plants were maintained in dooryards and used mainly for medical purposes. The genetic analysis showed no heterozygous plants at the loci tested (f = 1), indicating that reproduction occurs mainly through selfing. The total genetic diversity was high (He = 0.39); and a high level of differentiation was observed between cotton plants from the two states (F ST = 0.36). Conventional methods of in situ maintenance of G. barbadense populations are not applicable. The conservation of the genetic variability of populations present in the two states could be achieved through germplasm collection and establishing of ex situ seed banks.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
