Temporal genetic stability and high effective population size despite fisheries-induced life-history trait evolution in the North Sea sole

• Published in: Molecular ecology Vol. 20; no. 17; pp. 3555 - 3568
• Main Authors: CUVELIERS, E. L., VOLCKAERT, F. A. M., RIJNSDORP, A. D., LARMUSEAU, M. H. D., MAES, G. E.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01-09-2011
• Subjects: Animal populations; Animal reproduction; Animals; cod gadus-morhua; DNA - genetics; DNA - isolation & purification; dover sole; effective population size; Evolution; evolving fish stocks; Fisheries; fishery; Flatfishes - genetics; Gene Frequency; Genetic diversity; Genetic Drift; Genetic Loci; Genetic Variation; Genetics, Population; historical DNA; linkage disequilibrium; marine fish; microsatellite null alleles; Microsatellite Repeats; microsatellites; North Sea; overlapping generations; plaice pleuronectes-platessa; Population Density; Population genetics; reproductive success; Solea solea; steelhead trout; North Sea
• ISSN: 0962-1083; 1365-294X
• DOI: 10.1111/j.1365-294X.2011.05196.x

Heavy fishing and other anthropogenic influences can have profound impact on a species’ resilience to harvesting. Besides the decrease in the census and effective population size, strong declines in mature adults and recruiting individuals may lead to almost irreversible genetic changes in life‐history traits. Here, we investigated the evolution of genetic diversity and effective population size in the heavily exploited sole (Solea solea), through the analysis of historical DNA from a collection of 1379 sole otoliths dating back from 1957. Despite documented shifts in life‐history traits, neutral genetic diversity inferred from 11 microsatellite markers showed a remarkable stability over a period of 50 years of heavy fishing. Using simulations and corrections for fisheries induced demographic variation, both single‐sample estimates and temporal estimates of effective population size (Ne) were always higher than 1000, suggesting that despite the severe census size decrease over a 50‐year period of harvesting, genetic drift is probably not strong enough to significantly decrease the neutral diversity of this species in the North Sea. However, the inferred ratio of effective population size to the census size (Ne/Nc) appears very small (10−5), suggesting that overall only a low proportion of adults contribute to the next generation. The high Ne level together with the low Ne/Nc ratio is probably caused by a combination of an equalized reproductive output of younger cohorts, a decrease in generation time and a large variance in reproductive success typical for marine species. Because strong evolutionary changes in age and size at first maturation have been observed for sole, changes in adaptive genetic variation should be further monitored to detect the evolutionary consequences of human‐induced selection.