Hi all
In response to my previous post, I submit this -- which suggests quite the opposite

> Sudden biotic pressures, such as those from novel diseases and pathogens, require populations to respond rapidly or face potential extinction. How this response process takes place remains poorly understood, particularly in natural environments. In this study we take advantage of unique decade-long data sets of two wild honey bee (Apis mellifera) populations in the United States to reconstruct the evolution of tolerance to a novel parasite, the ectoparasitic mite Varroa destructor. 

> Our analyses illustrate that ecologically relevant traits emerge from highly polygenic selection involving thousands of genes contributing to complex patterns of evolutionary change.

> With the caveat that correlational studies, particularly in the field, cannot account for all possible factors at play, a major strength of the current study is that it captures year-to-year changes in unmanaged populations in response to a novel parasite and associated zoonotic diseases ...Thus, it seems likely that parallel evolution was driven by Varroa, though strictly speaking, we cannot rule out other causes during the period of the same few years.

Bozek, Katarzyna, et al. "Parallel genomic evolution of parasite tolerance in wild honey bee populations." bioRxiv (2018): 498436.
This article is a preprint and has not been peer-reviewed
https://www.biorxiv.org/content/early/2018/12/19/498436

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