Effective Population Number

摘要: Effective population number (or more commonly, effective size, N e ) is the evolutionary analogue to census N. , rather than determines rate of random genetic drift and hence rates allele frequency change, loss variability, increase in inbreeding. = only special case an ‘ideal’ population, which variation among individuals reproductive success completely random. In most real populations, exceeds expectation, this reduces compared . Unless sex ratio exactly 1:1, members less numerous must on average produce offspring, ; however, effect not large unless strongly skewed. Long-term depends harmonic mean single-generation values. Because dominated by small values, bottlenecks (generations with can have a profound diversity. Recent decades seen great deal interest using methods estimate better understand processes, aid conservation efforts. These studies provided empirical evidence for wide / species different life histories ecologies.