Abstract
We used both direct (mark-recapture) andindirect (microsatellite analysis)methodologies to investigate dispersal betweentwo putative populations of brook charr (Salvelinus fontinalis) in Freshwater River,Cape Race, Newfoundland, Canada. Over a 5-yearstudy period, mark-recapture data revealed somemovement by fish, but the proportion ofrecaptured fish migrating from one populationarea to another was low (0–4.1%).Additionally, during sampling periods in thespawning seasons, no fish was found in thealternate population area to that of its firstcapture. Despite this pattern of limitedmovement, microsatellite analysis based onsixteen polymorphic loci provided no evidenceof genetic differentiation. Indirect estimatesof dispersal parameters varied greatly betweendifferent methods of analysis. While use of acoalescent-based model yielded estimatedmigration rates congruent with the results ofthe mark-recapture study, other methodsresulted in much higher estimates of migrationbetween the populations. In particular, thelack of genetic differentiation coupled withlikely violations of the assumed island modelprevented generation of meaningful estimates ofdispersal using Fst. The disparitiesbetween migration rates estimated from themark-recapture work and from the differentindirect methods highlight the difficulties ofusing indirect methods to estimate dispersal onan ecological timescale. However,mark-recapture methods can fail to detecthistorical or episodic movement that isimportant in an evolutionary context, and wetherefore argue that a combination of directand indirect methods can provide a morecomplete picture of dispersal than eitherapproach alone.
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Wilson, A., Hutchings, J. & Ferguson, M. Dispersal in a stream dwelling salmonid: Inferences from tagging and microsatellite studies. Conservation Genetics 5, 25–37 (2004). https://doi.org/10.1023/B:COGE.0000014053.97782.79
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DOI: https://doi.org/10.1023/B:COGE.0000014053.97782.79