The more quickly the CMS allele spreads to fixation, the less opportunity populations will have to escape extinction.
Focusing on competition draws attention to macro-level factors that determine the demand of vocational training opportunities, e.g., population development, labour-market conditions and economic characteristics of a region.
It's cause and effect; and until economic policies recognize and create opportunities from population aging, the economic arrows will not turn up.
Moreover, distribution, and therefore opportunities for population differentiation, in these groups remains constrained by the stressful effects of temperature extremes on early life-history stages [76].
These two islands were interconnected during the glacial periods [ 6] (Fig. 1), providing opportunities for population expansion.
Natural selection would favor an r strategist when there are ample opportunities for population expansion and intraspecific competition is minimum.
The presence of inorganic arsenic in incinerator ash and pelletized waste sold as fertilizer creates opportunities for population exposures that did not previously exist.
Recent advances in molecular techniques, such as microsatellite markers, have created new opportunities for population genetic research that can be used to estimate the genetic variation and clarify the level of migration among populations of B. racemosa across its range.
We expect more differentiation in groups with low vagility and in other areas, such as western North America, where higher topographic roughness provides more opportunities for population isolation and differentiation.
The lack of mating opportunities when population size is low is one such effect [ 32], and for introduced guppies may mean that the usual strategy of multiple mating is no longer an option.
