title: Temporal changes in allele frequencies in a small marble trout Salmo marmoratus population threatened by extreme flood events.
abstract: The effect of extreme floods on the genetic composition of marble trout Salmo marmoratus living in Lipovscek, a tributary of the Soca River in Slovenia, which has been affected by multiple destructive flood events for centuries was investigated. By monitoring genetic variability during the period 2004-2011, apparent signatures of genetic erosion including a decline in observed and expected heterozygosities and allelic richness were observed. Contemporary effective population size was estimated between 11 and 55 individuals, which is congruent with census data. The data suggest asymmetric gene flow between the two sections of the river. The existence of substantial downstream migration (15-19%) was confirmed by paternity analysis. A small (1-3%) upstream migration was also suggested, which was confirmed by tagging data. Overall, low genetic diversity has not prevented the survival of the Lipovscek population, which might be a common feature of salmonid freshwater populations.
authors.affiliation: Department of Bioscience, Aarhus University, DK-8000, Aarhus, Denmark.
authors.forename: J M
authors.initials: JM
authors.lastname: Pujolar
authors.affiliation: Center for Stock Assessment Research, Department of Applied Mathematics and Statistics, University of California, Santa Cruz, CA, 95064, U.S.A.|Department of Environmental Sciences, University of Parma, 43100, Parma, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Vincenzi
authors.affiliation: Department of Biology, University of Padova, 35121, Padova, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Zane
authors.affiliation: Station Biologique de la Tour du Valat, 13200, Arles, France.
authors.forename: A J
authors.initials: AJ
authors.lastname: Crivelli
mesh_terms: D025041:Animal Migration; D000818:Animals; D055868:Floods; D051456:Gene Flow; D005787:Gene Frequency; D014644:Genetic Variation; D006579:Heterozygote; D011156:Population Density; D045483:Rivers; D012487:Salmonidae / Q000235:genetics; D017524:Slovenia; D014337:Trout / Q000235:genetics*
keywords: disturbance events; genetic erosion; genetic events; recurring floods; resilience; salmonids