Yesterday the Federal Trade Commission turned many of those critics into supporters by approving a creative agreement that permits the merger to go forward, but in a way that no longer threatens to erode the diversity of news and entertainment that flow into American homes.
We found high genetic diversity (HE = 0.670 0.754) in both adults and offspring in the fragmented agricultural landscape, suggesting that habitat fragmentation did not necessarily erode genetic diversity of E. cavaleriei.
Such factors combine to erode genetic diversity within populations and enhance between-population differentiation (Rathcke and Jules 1993; Steffan-Dewenter and Tscharntke 1999).
For pragmatic reasons, most oat breeders tend to favour crosses among locally adapted varieties, which may erode genetic diversity within a breeding program and create geographically-dependent population structures.
Small population sizes favour inbreeding behaviour and allow genetic drift to erode genetic diversity, while increased isolation limits gene flow, i.e. arrival of new alleles and non-related individuals.
Occasional events that affect large geographic areas, as well as periodic bottlenecks associated with cycles of poor marine and/or freshwater productivity, can erode existing diversity that has built up over decades, centuries, or millennia, thus resetting the evolutionary clock.
Because mate choice increases variation in mating success, this will generally reduce effective population size and erode genetic diversity in the captive population; thus, the benefits of incorporating mate choice will need to be balanced against any costs.
Our study has implications for efforts to understand how mate choice can provide genetic benefits without eroding genetic diversity (lek paradox), and also conservation efforts to determine the fitness consequences of inbreeding and the maintenance of genetic diversity in small, inbred populations.
"It would be a tragedy if our nation's colleges and universities slipped backward now, denying access to talented but disadvantaged youth and eroding the diversity that helps to prepare leaders".
