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2008
- handle: 10670/1.0849lq
- 0378-1844
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http://www.redalyc.org/revista.oa
Interciencia
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Theme with variations Theme and variations Musical variations Speciation (Biology) Reducing Weight reduction Weight reducing Obesity--Control Loss of weight Weight control of obesity Reduction of weight Losing weight Slimming Populations, Human Human populations Population growth Human population Papers Hybridisation Hybridism Endosymbiotic relationships Living organisms Biota Biological organisms Primary sources Forerunners Primary sources Invaders (Organisms) Foreign species (Introduced organisms) Invasive alien species Translocated organisms Foreign organisms (Introduced organisms) Naturalised organisms Alien species Non-indigenous organisms Non-native species Nonindigenous species Non-native organisms Nonnative species Naturalized organisms Introduced species Translocated species Invasive species Exotic organisms Nonindigenous organisms Invasive organisms Nonnative organisms Alien organisms Exotic species Non-indigenous species Demography DemographicsCiter ce document
Sinatra K. Salazar et al., « Bioinvaders: the acquisition of new genetic variation », Interciencia, ID : 10670/1.0849lq
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"Given that the introduction of organisms into a new environmentusually occurs in low numbers, reducing genetic diversity(the so-called bottleneck effect), and that selection further decreasesdiversity beyond that caused by the bottleneck, then howdo some alien species, if their genetic variation is low undernew conditions, succeed in evolving rapidly, becoming invasiveand expanding their ranges? In this paper a series of mechanismsthat allow the introduced population to acquire new geneticvariations are considered. Various possible roles of epigeneticadaptation, hybridization, adaptive mutations, transposons,endosymbiosis, somatic mutations, and mitotic recombinationare postulated as sources of new genetic variations. The rolesof purging and biotic regulation in the successful invasions ofsome species is also analyzed."