jim mallet

@WTF_R_species

natural historian, PhD Texas, native Londoner. (Profile pic from Mauro Cutrona )

Vrijeme pridruživanja: lipanj 2011.

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  1. Prikvačeni tweet
    13. lis 2018.

    Probably the most complete study of a hybrid zone and "islands of speciation" as you could hope to find, and it's in Antirrhinum

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  2. proslijedio/la je Tweet
    30. sij

    . provides more context and important considerations re: . Everyone involved with this mess is human (including Jonathan) so I'll just reiterate the need for patience and as much understanding as possible.

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  3. proslijedio/la je Tweet
    1. velj

    Spider biologist denies suspicions of widespread data fraud in animal personality research

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  4. 27. sij
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  5. 26. sij

    Systematic and functional analysis of horizontal gene transfer events in diatoms.

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  6. 26. sij

    11/n If you want to see my 2012 personal exegesis of the Lotka Volterra competition and natural selection it's at:

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  7. 26. sij

    10/n At least, that's my interpretation of the problem!

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  8. 26. sij

    9/n In my personal exegesis of Lotka-Volterra equations of "ecological competition" and two-phenotype natural selection, I show that the general model of selection will mostly be density-dependent and hard, although parameters can be tweaked to generate ~soft selection

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  9. 26. sij

    8/n You can see now, perhaps, where the link to genetic load lies, and why Wallace, a selectionist in the neutralist-selectionist debate, was talking about it to understand polymorphism.

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  10. 26. sij

    7/n Soft selection is commonly assumed by population geneticists for no good reason: in the Christiansen interpretation I follow it means that different values of selection have no effect on overall density. Hard selection is where selection changes population density

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  11. 26. sij

    6/n Density-dependent selection is selection that depends on density. In Lotka-Volterra terms it's the alpha non-linear term. Density-independent selection is the effect on the intrinsic growth rate, the constant r in Lotka-Volterra equations.

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  12. 26. sij

    5/n So what's the difference between density-dependent vs. density-independent selection, and hard vs. soft selection.

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  13. 26. sij

    4/n One of the few people who carefully thought about population density as well as selection at the time was Freddy Bugge Christiansen. The first paragraph of his 1975 paper gets hard and soft selection straight: American Naturalist 109:11-16.

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  14. 26. sij

    3/n As a postdoc with Nick Barton we discussed how gene flow might be modeled in a stepping-stone arrangement of demes which I needed to understand a Heliconius hybrid zone. Source population density would affect m, the fraction of a population that is replaced by migration

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  15. 26. sij

    2/n Even Wallace was confused by his own original definitions of hard and soft selection, and he changed his views over time:

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  16. 26. sij

    1/n Wallace was a very friendly but somewhat forgetful fellow when I met him at age 94. However, I think that your problem of muddling the definitions, and also mine a long time ago, was due to Wallace's own muddled thinking. I'll explain:

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  17. proslijedio/la je Tweet
    25. sij

    When ever I muddle up the definitions of soft/hard selection (which is often), I go back to Bruce Wallace's adult flies resembling the Dean of Faculty example. (from: )

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  18. 24. sij

    This is an extraordinary story of discovery of biodiversity by a non-biologist in what is possibly the best studied woodland on the planet

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  19. proslijedio/la je Tweet
    22. sij

    OEB is hiring for Preceptor position starting July 2020. For more information and to apply:

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  20. 23. sij

    Oh - probably very sage advice! But I ALWAYS appeal if I don’t agree with the reviewers/editor. It works about 50% of the time I’ve found, and it’s usually quicker than revising & refocusing for a different journal

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  21. 23. sij

    Very nice paper on S. American woodcreepers just came to my attention!

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