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Effects of intense versus diffuse population bottlenecks on microsatellite genetic diversity and evolutionary potential

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Abstract

Population bottlenecks occur frequently inthreatened species and result in loss ofgenetic diversity and evolutionary potential.These may range in severity between shortintense bottlenecks, and more diffusebottlenecks over many generations. However,there is little information on the impacts ofdifferent types of bottlenecks and disagreementas to their likely impacts. To resolve thisissue, we subjected replicate Drosophilapopulations to intense bottlenecks, consistingof one pair over a single generation, versusdiffuse bottlenecks consisting of an effectivesize of 100 over 57 generations. The intenseand diffuse bottlenecks were designed to induceidentical losses of heterozygosity. However,computer simulations showed that theprobability of retaining alleles is lower inthe intense than the diffuse bottlenecktreatment. The effects of these bottlenecks ongenetic diversity at nine microsatellite lociin Drosophila were evaluated. Bottleneckssubstantially reduced allelic diversity,heterozygosity and proportion of locipolymorphic, changed allele frequencydistributions and resulted in large differencesamong replicate populations. Allelic diversity,scaled by heterozygosity, was lower in theintense than the diffuse treatments. Short-termevolutionary potential, measured as the abilityof bottlenecked populations to cope withincreasing concentrations of NaCl, did notdiffer between the intense and diffusebottlenecked populations. The effects ofbottlenecks on short-term evolutionarypotential relate to loss of heterozygosity,rather than allelic diversity.

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England, P.R., Osler, G.H., Woodworth, L.M. et al. Effects of intense versus diffuse population bottlenecks on microsatellite genetic diversity and evolutionary potential. Conservation Genetics 4, 595–604 (2003). https://doi.org/10.1023/A:1025639811865

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