Last year, an incident at an Australian rig unleashed an oil drift the size of Maryland.
For example, the effect of genetic drift (population size) is inferred from the comparison between D. melanogaster and D. simulans [ 16, 17].
Genetic structure is affected by several factors, such as breeding systems, genetic drift, population size, seed dispersal, gene flow, evolutionary history and natural selection (Hamrick and Godt 1990).
As a consequence, disparate populations of a widespread species that have been exposed to dissimilar selection regimes or differentially subjected to drift (population size or founder events) can be differentiated for sex determination mechanisms.
Because biological invasions involve dispersal of genes over long distances, the genetic composition of an introduced species is generally influenced by the history of introduction, genetic drift, population size, reproductive system and environmental heterogeneity (Ye et al. 2004; Begg et al. 2012).
At last, Mr. Weckwerth, 42, and Mr. Kelley, 39, friends and fishing companions since high school, could stop daydreaming of swirling windblown drifts the size of sasquatch and a landscape that looked like a sunless, otherworldly vision of post-apocalyptic doom.
THE view from my airplane window at Jackson Hole airport was one that most skiers would envy: snow cyclones purling down the runway, baggage attendants in ski goggles, drifts the size of camper vans framing the arrival gate.
In organisms with very large population sizes, drift is weak and modest variation in population size may play little role in determining variation in TE abundance.
Boni, M. F., Gog, J. R., Andreasen, V. & Christiansen, F. B. Influenza drift and epidemic size: the race between generating and escaping immunity.
The rise of population genetics models (early 20th C). provides illustrations of how forces of selection, genetic drift, and population size can change the genetic composition of natural populations.
