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Keyword: habitat fragmentation

Consistent loss of genetic diversity in isolated cutthroat trout populations independent of habitat size and quality

Publications Posted on: August 29, 2017
Fragmentation and isolation of wildlife populations has reduced genetic diversity worldwide, leaving many populations vulnerable to inbreeding depression and local extinction. Nonetheless, isolation is protecting many native aquatic species from interactions with invasive species, often making reconnection an unrealistic conservation strategy.

Biological corridors and connectivity [Chapter 21]

Publications Posted on: June 20, 2013
The ability of individual animals to move across complex landscapes is critical for maintaining regional populations in the short term (Fahrig 2003; Cushman 2006), and for species to shift their geographic range in response to climate change (Heller & Zavaleta 2009).

Simulating the effects of climate change on population connectivity of American marten (Martes americana) in the northern Rocky Mountains, USA

Publications Posted on: May 24, 2012
We utilize empirically derived estimates of landscape resistance to assess current landscape connectivity of American marten (Martes americana) in the northern Rocky Mountains, USA, and project how a warming climate may affect landscape resistance and population connectivity in the future. We evaluate the influences of five potential future temperature scenarios involving different degrees of warming.

Why replication is important in landscape genetics: American black bear in the Rocky Mountains

Publications Posted on: October 05, 2011
We investigated how landscape features influence gene flow of black bears by testing the relative support for 36 alternative landscape resistance hypotheses, including isolation by distance (IBD) in each of 12 study areas in the north central U.S. Rocky Mountains. The study areas all contained the same basic elements, but differed in extent of forest fragmentation, altitude, variation in elevation and road coverage.

Relationships between migration rates and landscape resistance assessed using individual-based simulations

Publications Posted on: December 07, 2010
Linking landscape effects on gene flow to processes such as dispersal and mating is essential to provide a conceptual foundation for landscape genetics. It is particularly important to determine how classical population genetic models relate to recent individual-based landscape genetic models when assessing individual movement and its influence on population genetic structure.

Quantifying the lag time to detect barriers in landscape genetics

Publications Posted on: December 06, 2010
Understanding how spatial genetic patterns respond to landscape change is crucial for advancing the emerging field of landscape genetics. We quantified the number of generations for new landscape barrier signatures to become detectable and for old signatures to disappear after barrier removal.

Estimation of census and effective population sizes: the increasing usefulness of DNA-based approaches

Publications Posted on: December 06, 2010
Population census size (NC) and effective population sizes (Ne) are two crucial parameters that influence population viability, wildlife management decisions, and conservation planning. Genetic estimators of both NC and Ne are increasingly widely used because molecular markers are increasingly available, statistical methods are improving rapidly, and genetic estimators complement or improve upon traditional demographic estimators.

Population ecology, habitat requirements, and conservation of neotropical migratory birds

Publications Posted on: January 27, 2010
This report was prepared in support of the National Fish and Wildlife Foundation's Neotropical Migratory Bird Conservation Program and the USDA Forest Service's role in the program. Recent analyses of data on forest-dwelling species, many of which are neotropical migrants, show population declines in many North American areas.

Invasion versus isolation: Trade-offs in managing native salmonids with barriers to upstream movement

Publications Posted on: August 31, 2009
Conservation biologists often face the trade-off that increasing connectivity in fragmented landscapes to reduce extinction risk of native species can foster invasion by non-native species that enter via the corridors created, which can then increase extinction risk.

Effects of habitat loss and fragmentation on amphibians: A review and prospectus

Publications Posted on: July 24, 2007
Habitat loss and fragmentation are among the largest threats to amphibian populations. However, most studies have not provided clear insights into their population-level implications. There is a critical need to investigate the mechanisms that underlie patterns of distribution and abundance.