Dating the genetic bottleneck of the america cheetah summary Gstrip chat line
Philandering males, sneaking around behind their partners' backs or openly canoodling, are a stock character on Animal Planet.Male lions, male chimps, and male elephant seals (along with many others) play the Casanovas, pairing up with multiple females.A genetic bottleneck occurs when a population is reduced in size for at least one generation.A smaller number of individuals leads to less genetic variation (Berkely).But now researchers have revealed that cheetahs buck this sexual stereotype.According to the May 2007 study, female cheetahs seem to be at least as promiscuous as their male counterparts.During the extinction, the cheetah and its relatives experienced a demographic genetic bottleneck, in which all of them died off except one small group which are the ancestors of all cheetahs living today.As a result of extensive inbreeding, all of today's cheetah's live in Northern Africa or Asia and are closely related and genetically similar (Charruau et al., 2011).
Cheetah-like cats (species of the extinct genus Miracinonyx) appeared in North America at about this time, suggesting speciation events occurring as members of the lineage migrated from North America to Eurasia to Africa.
A near-extinction event about 10,000 years ago and subsequent population "bottlenecks" have resulted in low genetic diversity in Acinonyx. venaticus, the Asiatic cheetah only other subspecies listed as threatened).
This is of utmost concern to conservation biologists because it is a threat to the survival of the species in addition to growing conflicts with humans over livestock, loss of habitat, and interspecific competition with other large carnivorans in protected areas. In Iran, there are currently only 60 cheetahs remaining in the wild. Phylogenetic reconstruction of the Felidae using 16S r RNA and NADH-5 mitochondrial genes.
Alternatively, if by chance survivors of the bottleneck are the individuals with the greatest genetic fitness, the frequency of the fitter genes within the gene pool is increased, while the pool itself is reduced.
The genetic drift caused by a population bottleneck can change the proportional distribution of alleles by chance and even lead to fixation or loss of alleles.