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Keyword: genetic diversity

Hierarchical population structure in greater sage-grouse provides insight into management boundary delineation

Publications Posted on: August 09, 2016
Understanding population structure is important for guiding ongoing conservation and restoration efforts. The greater sage-grouse (Centrocercus urophasianus) is a species of concern distributed across 1.2 million km2 of western North America.

Conservation genetics and geographic patterns of genetic variation of the vulnerable officinal herb Fritillaria walujewii (Liliaceae)

Publications Posted on: October 06, 2015
The Chinese herb Fritillaria walujewii Regel is an important officinal species that is vulnerable because of over-harvesting. Here, we examined the geographic pattern of genetic variation across the species entire range, to study its evolution process and give implication needed for the conservation. Nine haplotypes were detected on the basis of three chloroplast spacers.

Cytotype differences in radial increment provide novel insight into aspen reproductive ecology and stand dynamics

Publications Posted on: February 09, 2015
High rates of triploidy have recently been described in quaking aspen (Populus tremuloides Michx.) of the Intermountain West, raising questions about the contributions of triploidy to stand persistence and dynamics. In this study, we investigated cytotype differences between diploid and triploid aspen clones using dendrochronological techniques.

Population connectivity and genetic diversity of American marten (Martes americana) in the United States northern Rocky Mountains in a climate change context

Publications Posted on: May 24, 2012
Climate change is likely to alter population connectivity, particularly for species associated with higher elevation environments. The goal of this study is to predict the potential effects of future climate change on population connectivity and genetic diversity of American marten populations across a 30.2 million hectare region of the in the US northern Rocky Mountains.

Compromising genetic diversity in the wild: Unmonitored large-scale release of plants and animals

Publications Posted on: March 15, 2012
Large-scale exploitation of wild animals and plants through fishing, hunting and logging often depends on augmentation through releases of translocated or captively raised individuals. Such releases are performed worldwide in vast numbers.

Population genetic structure of the seed pathogen Pyrenophora semeniperda on Bromus tectorum in western North America

Publications Posted on: November 17, 2011
We examined genetic variation in the ascomycete pathogen Pyrenophora semeniperda cultured from seeds of the invasive grass Bromus tectorum in the Intermountain West of North America. We sequenced the internal transcribed spacer (ITS) region of the nuclear ribosomal RNA genome in 417 monoconidial cultures collected from 20 sites in Washington, Idaho, Utah and Colorado, USA.

sGD software for estimating spatially explicit indices of genetic diversity

Publications Posted on: October 05, 2011
Anthropogenic landscape changes have greatly reduced the population size, range and migration rates of many terrestrial species. The small local effective population size of remnant populations favours loss of genetic diversity leading to reduced fitness and adaptive potential, and thus ultimately greater extinction risk. Accurately quantifying genetic diversity is therefore crucial to assessing the viability of small populations.

Neglect of genetic diversity in implementation of the Convention on Biological Diversity

Publications Posted on: December 06, 2010
Genetic diversity is the foundation for all biological diversity; the persistence and evolutionary potential of species depend on it. World leaders have agreed on the conservation of genetic diversity as an explicit goal of the Convention on Biological Diversity (CBD). Nevertheless, actions to protect genetic diversity are largely lacking.

Outlook for blight-resistant American chestnut trees

Publications Posted on: May 19, 2009
Culminating 20 years of breeding efforts, in spring 2008, The American Chestnut Foundation (TACF) delivered its first 500 chestnuts to the USDA Forest Service for testing on National Forest lands. The expectation is that these seedlings will be more resistant to chestnut blight (Cryphonectria parasitica) than are pure American chestnut trees (Castanea dentata).

Criterion 1: Conservation of biological diversity - Indicator 8: The number of forest dependent species that occupy a small portion of their former range

Publications Posted on: March 25, 2008
This indicator measures the portion of a species' historical distribution that is currently occupied as a surrogate measure of genetic diversity. Based on data for 1,642 terrestrial animals associated with forests, most species (88 percent) were found to fully occupy their historic range - at least as measured by coarse state-level occurrence patterns.