With the discovery of coal, a large influx of settlers led to an early breakdown of the isolation of this part of the Appalachians.
In addition, the media's ability to spread a global mass culture causes a breakdown of cultural isolation that leads to more immigration and heavy pressure on the laws and institutions of citizenship and immigration.
The breakdown of reproductive isolation is of concern to managers, and raises the question: how have the two species retained their genetic and morphological divergence?
Natural attributes of the river/stream systems are also expected to play a role in the breakdown of reproductive isolation in the coastal rainbow and cutthroat trout, and are also included in our models.
In cases where cutthroat and rainbow trout exist sympatrically, the introduction of rainbow trout of a different origin (usually hatchery-bred and reared) has been shown to accelerate the breakdown of reproductive isolation (Docker et al. 2003).
How will the Mars One programme react when a colonist who was deemed psychologically fit suffers a major breakdown after years of isolation, with no way to get home?
As the Bucks have shown, the Bulls are prone to half-court breakdowns, both off of isolation and dribble handoffs, often not helping enough or even helping too much.
Our data show that exposure to endocrine-disrupting chemicals (EDCs) can facilitate the breakdown of prezygotic reproductive isolation between closely related species.
The salient question is whether these results are best explained by secondary contact between M and S and partial breakdown of extrinsic mechanisms of isolation, or alternatively, by a less advanced speciation process characterized by a high degree of shared ancestral polymorphisms.
Moreover it is a process which, while it owes its development principally to the growth of travel both within and from outside Australia, can trace its origins back to the 1956 Olympic games in Melbourne.That year, for the first time, significant numbers of young, predominantly French chefs arrived to cook and, unwittingly, to initiate the breakdown of Australia's gastronomic isolation.
