I have several populations of a marine angiosperm (Halodule wrightii) that reproduces both clonally and sexually. I've identified several multi-locus genotypes (MLGs) that appear in more than one population, sometimes separated by distances as great as 200 km. I'm trying to determine whether these MLGs are relatively recent migrants or perhaps members of a founder genotype that dispersed over longer time scales. Results from STRUCTURE analyses are inconclusive. Any suggestions are appreciated!
If you are trying to identify very recent migrants, like first generation ones, I think Geneclass2 (Piry 2004) do that, if I remember well...
You could try with IMMANC. It is a software designed to identify immigrants or individuals having recent immigrant ancestry.
Rannala, B. and Mountain, J. L. 1997. Detecting immigration by using multilocus genotypes. – Proc. Natl Acad. Sci. USA 94:9197– 9201.
Good Luck!
Patrick,
Migrate & Migrate-n (http://popgen.sc.fsu.edu/Migrate/Migrate-n.html) are expected to do the job, but they are quite awfull to stabilize and to get converging results. Depends of your data set.
best,
All these methods that have been suggested (Structure, Geneclass, IMMANC, Migrate) assume sexual reproduction and will not be appropriate in a case of a partially clonal species with a high clonality rate (which must be your case since you find repeated MLGs). I suggest you to check R package Poppr to see what kind of analysis they propose, though I doubt there is anything specific for detection of migrants.
Article Poppr: an R package for genetic analysis of populations with...
Hello you can also use. Bayesass that is based in coalescence and together with the migration calculate an assignation test that give you more confidence of the calculation.
http://www.rannala.org/inference-of-recent-migration/
Thank you all for your responses! I shall look into these options.
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