Your browser doesn't support javascript.
loading
Are we underestimating the occurrence of sympatric populations?
Jorde, Per Erik; Andersson, Anastasia; Ryman, Nils; Laikre, Linda.
Affiliation
  • Jorde PE; Institute of Marine Research, His, Norway.
  • Andersson A; Division of Population Genetics, Department of Zoology, Stockholm University, Stockholm, Sweden.
  • Ryman N; Division of Population Genetics, Department of Zoology, Stockholm University, Stockholm, Sweden.
  • Laikre L; Division of Population Genetics, Department of Zoology, Stockholm University, Stockholm, Sweden.
Mol Ecol ; 27(20): 4011-4025, 2018 10.
Article de En | MEDLINE | ID: mdl-30137668
ABSTRACT
Sympatric populations are conspecific populations that coexist spatially. They are of interest in evolutionary biology by representing the potential first steps of sympatric speciation and are important to identify and monitor in conservation management. Reviewing the literature pertaining to sympatric populations, we find that most cases of sympatry appear coupled to phenotypic divergence, implying ease of detection. In comparison, phenotypically cryptic, sympatric populations seem rarely documented. We explore the statistical power for detecting population mixtures from genetic marker data, using commonly applied tests for heterozygote deficiency (i.e., Wahlund effect) and the structure software, through computer simulations. We find that both tests are efficient at detecting population mixture only when genetic differentiation is high, sample size and number of genetic markers are reasonable and the sympatric populations happen to occur in similar proportions in the sample. We present an approximate expression based on these experimental factors for the lower limit of FST , beyond which power for structure collapses and only the heterozygote-deficiency tests retain some, although low, power. The findings suggest that cases of cryptic sympatry may have passed unnoticed in population genetic screenings using number of loci typical of the pre-genomics era. Hence, cryptic sympatric populations may be more common than hitherto thought, and we urge more attention being diverted to their detection and characterization.
Sujet(s)
Mots clés

Texte intégral: 1 Collection: 01-internacional Base de données: MEDLINE Sujet principal: Analyse de séquence d'ADN / Sympatrie Type d'étude: Prognostic_studies Limites: Animals Langue: En Journal: Mol Ecol Sujet du journal: BIOLOGIA MOLECULAR / SAUDE AMBIENTAL Année: 2018 Type de document: Article Pays d'affiliation: Norvège

Texte intégral: 1 Collection: 01-internacional Base de données: MEDLINE Sujet principal: Analyse de séquence d'ADN / Sympatrie Type d'étude: Prognostic_studies Limites: Animals Langue: En Journal: Mol Ecol Sujet du journal: BIOLOGIA MOLECULAR / SAUDE AMBIENTAL Année: 2018 Type de document: Article Pays d'affiliation: Norvège