[Leps-l] Monarchs - subspecies, genetics and migration

Walsh, Bruce - (jbwalsh) jbwalsh at arizona.edu
Sun May 29 03:17:02 EDT 2022

I've followed this thread for a little while and have avoided commenting on it.  In large part, because it started when I was in Nairobi, and had low band-width.  Now my travels have now taken me to Hobart, with its higher bandwidth!  Alas, no collecting/watching in either location, work-related (teaching and on an advisory committee).

>From a genetics standpoint, the issue can be clearly framed in terms of gene exchange.  In a classic paper, Sewall Wright (one of the founders of population genetics) noted that a single exchange of an individual between populations per generation is about all that is needed to keep two neutral subpopulations from diverging (more formally, 4Nm >> 1, where m is the exchange rate and N the population size).  So the issue becomes: "is there something about the migrationing  population that results in a drastic reduction in gene exchange with the non-migration population".   Unless there is differential mate choice when they come into contact (which they will do each year), don't think the case can be made.



Bruce Walsh
Professor, Ecology and Evolutionary Biology
Professor, Public Health
Professor, BIO5 Institute
Professor, Plant Sciences
Adjunct Professor, Animal and Comparative Biomedical Sciences
Adjunct Professor, Molecular and Cellular Biology
Member, Graduate Committees on Applied Math, Insect Sciences, Genetics, Statistics
University of Arizona

Evolution and Selection of Quantitative Traits (Oxford 2018)

Genetics and Analysis of Quantitative Traits (Sinauer <Oxford>  1998)

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