Telemetry and genetics reveal asymmetric dispersal of a lake-feeding salmonid between inflow and outflow spawning streams at a microgeographic scale

Ecology and Evolution
Ross FinlayThomas E Reed

Abstract

The degree of natal philopatry relative to natal dispersal in animal populations has important demographic and genetic consequences and often varies substantially within species. In salmonid fishes, lakes have been shown to have a strong influence on dispersal and gene flow within catchments; for example, populations spawning in inflow streams are often reproductively isolated and genetically distinct from those spawning in relatively distant outflow streams. Less is known, however, regarding the level of philopatry and genetic differentiation occurring at microgeographic scales, for example, where inflow and outflow streams are separated by very small expanses of lake habitat. Here, we investigated the interplay between genetic differentiation and fine-scale spawning movements of brown trout between their lake-feeding habitat and two spawning streams (one inflow, one outflow, separated by <100 m of lake habitat). Most (69.2%) of the lake-tagged trout subsequently detected during the spawning period were recorded in just one of the two streams, consistent with natal fidelity, while the remainder were detected in both streams, creating an opportunity for these individuals to spawn in both natal and non-natal streams. The latter ...Continue Reading

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Citations

Jun 1, 2021·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Ken M JeffriesKristina M Miller

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Methods Mentioned

BETA
PCR
PCRs
genotyping

Software Mentioned

ape
R
SoftGenetics
COLONY
Arlequin
CHECKER
diveRsity
CLUMPP
GENEPOP
NeEstimator

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