The same type of rescue occurs for a population that starts near carrying capacity, but occupies an initial spatial size below that which is necessary for a population to successfully establish.
Aboriginal Australians descended from a single founding population that started in Southeast Asia and arrived on the continent about 50,000 years ago, according to a new genetic study.
The remarkably high degree of repeatability among the twelve replicated, independently evolved populations indicates that drift is not playing much of a role, even in the high-relatedness populations that started each round with only 500 spores.
To explore the size of the founding population, we assumed a simple demographic scenario where the introduced propagules founded a population that immediately started to increase.
Low unemployment and a population that is starting to age mean that growth can no longer come from adding workers.
To explore the size of the founding population, we modelled the allelic richness that would be expected of introduced populations using what we believe to be the two most parsimonious invasion scenarios: 1) A number of founders are introduced which establish a population that immediately starts to increase in size.
The phylogenies had a "chained" topology consistent with a population expansion that started in Taiwan and then moved through to the Philippines, Borneo/Sulawesi, Central Malayo-Polynesia, South Halmahera/West New Guinea, and finally out into Oceania.
Barisal, an administrative division to the south of Dhaka, is home to a population that is just starting to shrink.
Church officials deny that, but say the law is needed to keep cults and extremist groups from taking advantage of a population that is only starting to re-establish its ties to religion after 75 years of Soviet-enforced atheism.
The district's struggles can be traced to a skein of historic factors, beginning with the city's long-declining population, a trend that started in the 1950s and continues today.
