Friday, April 28, 2017

A plastic Daphnia stuck in the G matrix...

Heja!

Paper for next Tuesday:
The alignment between phenotypic plasticity, the major axis of genetic variation and the response to selection
Martin I. Lind, Kylie Yarlett, Julia Reger, Mauricio J. Carter and Andrew P. Beckerman
Proc. R. Soc. B 282: 20151651.
Link to paper




Abstract:
Phenotypic plasticity is the ability of a genotype to produce more than one phenotype in order to match the environment. Recent theory proposes that the major axis of genetic variation in a phenotypically plastic population can align with the direction of selection. Therefore, theory predicts that plasticity directly aids adaptation by increasing genetic variation in the direction favoured by selection and reflected in plasticity. We evaluated this theory in the freshwater crustaceanDaphnia pulex, facingpredation risk fromtwo contrasting size-selective predators. We estimated plasticity in several life-history traits, the G matrix of these traits, the selection gradients on reproduction and survival, and the predicted responses to selection. Using these data, we tested whether the genetic lines of least resistance and the predicted response to selection alignedwith plasticity. We found predator environment-specific G matrices, but shared genetic architecture across environments resulted in more constraint in the G matrix than in the plasticity of the traits, sometimes preventing alignment of the two. However, as the importance of survival selection increased, the difference between environments in their predicted response to selection increased and resulted in closer alignment between the plasticity and the predicted selection response. Therefore, plasticity may indeed aid adaptation to new environments.

Where?   Darwin
When?    May 2, 10.00 am

There will be fika, of course.

1 comment:

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    Hello everyone, my name is ALFREED SIANG i am here to say a big thank you to my doctor DR OLU who helped me enlarge my penis.i have never had a happy relationship in my life because of my inability to perform well due to my small penis, due to frustration,i went online in search of solution to ending my predicament and than i came across testimony on how DR OLU has helped them, so i contacted him and he promised to help me with penis enlargement,i doubted at first but i gave him a trial and he sent me the product which i used according to his prescription and in less than a week,i saw changes in my penis and it grow to the size i wanted and since then,i am now a happy man and no lady complains again about my penis.if you also need the services of my doctor,you can also contact him on his email..drolusolutionhome@gmail.com or his whataspp is +2348140654426

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