I wonder why there was a increased neutral assembly process and less phylogenetic clustering in higher salility sites. As far as I know, only these taxa can adapt to the high salinity environment are able to prevalence in higher salinity sites and the filtering effect of salinity increased in higher salinity sites as microbial diveristy decreased with increased salinity.So I suspect there was more close related taxa and increased phylogentic cluster in higher salinity sites. Hence, I am puzzling with the contradictory result. I wonder why the less phylogentic clustering occurred in higher salinity sites?
Thanks for your help.
Perhaps because the population is at the edge of adaptation optimum with increased selection against variation - only one genome fits the bill.
Hello Dr. Gibbs,
Thank you for your reply. But I am confused about "only one genome fits the bill". Could you give me some details? Thanks
Zhang
Imagine you have a population of taxon A in a 'neutral' environment. As there is no directional pressure via selection you will find many different sequences due to mutation. In this case all these sequences will cluster (phylogenetic clustering).
In a saline environment on the other hand you will only find one or a few variants per taxon, those who are the fittest in this extreme environment. and this is why you get fewer phylogenetic clustering. I think this is what Mr. Gibbs means with "only one genome fits the bill".
Hello Dr. Kretzschmar
Thanks for your teaching. Less taxon resulted in fewer phylogenetic clustering. That's may be one reason.
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