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Per Erik Jorde
Researcher at University of Oslo
Publications - 75
Citations - 3958
Per Erik Jorde is an academic researcher from University of Oslo. The author has contributed to research in topics: Population & Effective population size. The author has an hindex of 33, co-authored 71 publications receiving 3615 citations. Previous affiliations of Per Erik Jorde include Stockholm University.
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Journal ArticleDOI
Fine-scaled geographical population structuring in a highly mobile marine species: the Atlantic cod.
TL;DR: Findings lend support to the notion that low levels of differentiation are due to passive transport of eggs or larvae by the ocean currents rather than to adult dispersal, the latter being strongly dependent on distance.
Journal ArticleDOI
Unbiased estimator for genetic drift and effective population size.
Per Erik Jorde,Nils Ryman +1 more
TL;DR: Numerical evaluations of exact probability distributions and computer simulations verify that this new estimator yields unbiased estimates also when based on a modest number of alleles and loci, and eliminates the bias associated with earlier estimators.
Journal ArticleDOI
Temporal allele frequency change and estimation of effective size in populations with overlapping generations.
Per Erik Jorde,Nils Ryman +1 more
TL;DR: This paper presents an estimator for effective size that can be applied to populations with overlapping generations and shows that the amount of temporal allele frequency change is dependent on the age-specific survival and birth rates.
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Power for detecting genetic divergence: differences between statistical methods and marker loci.
Nils Ryman,Stefan Palm,Carl André,Gary R. Carvalho,Thomas G. Dahlgren,Per Erik Jorde,Linda Laikre,Lena C. Larsson,Anna Palmé,Daniel Eduardo Ruzzante +9 more
TL;DR: In this paper, the authors used computer simulations to assess and evaluate power when testing for genetic differentiation at multiple loci through combining test statistics or P values obtained by four different statistical approaches, viz. Pearson's chi-square, the log-likelihood ratio G-test, Fisher's exact test, and an F(ST)-based permutation test.
Journal ArticleDOI
Are low but statistically significant levels of genetic differentiation in marine fishes 'biologically meaningful'? A case study of coastal Atlantic cod.
Halvor Knutsen,Esben Moland Olsen,Per Erik Jorde,Sigurd Heiberg Espeland,Carl André,Nils Chr. Stenseth +5 more
TL;DR: It is concluded that low levels of genetic differentiation in this marine fish can indeed be biologically meaningful, corresponding to separate, temporally persistent, local populations.