Genetic parentage analysis confirms a polygynandrous breeding system in the European grayling (Thymallus thymallus)

PloS One
Peter Jørgen HaddelandL A Vøllestad

Abstract

Knowing the breeding system of a species is important in order to understand individual variation in reproductive success. Large variation in reproductive success and thus reproductive skew strongly impacts on the effective number of breeders and thus the long-term effective population size (Ne). Fishes, in particular species belonging to the salmonid family, exhibit a wide diversity of breeding systems. In general, however, breeding systems are rarely studied in detail in the wild. Here we examine the breeding system of the spring-spawning European grayling Thymallus thymallus from a small Norwegian stream using parentage assignment based on the genotyping of 19 polymorphic microsatellite loci. In total 895 individual grayling fry and 154 mature grayling (57 females and 97 males) were genotyped. A total of 466 offspring were assigned a father, a mother, or a parent pair with a confidence of 90% or higher. Successfully reproducing males had on average 11.9 ± 13.3 (SD) offspring with on average 2.1 ± 1.2 partners, whereas successful females had on average 9.5 ± 12.8 offspring and 2.3 ± 1.5 partners. Parents with more partners also produced more offspring. Thus the grayling breeding system within this small stream revealed a poly...Continue Reading

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Citations

Aug 5, 2020·PloS One·Silvia GianìDiego Breviario
Aug 26, 2021·Evolutionary Applications·Ilana J Koch, Shawn R Narum

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Methods Mentioned

BETA
genotyping
PCRs
PCR

Software Mentioned

GeneMapper
JMP
MasterBayes
R package MasterBayes
GenAlEx
CERVUS
COLONY

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