Is this effect now common consensus even among micro-biologists? That is, environmental pressure does increase mutation rates?
Hammegk- I cannot answer your question, being no biologist- but I think the question misses my point, which is that while mutation supplies the raw material for natural selection, it need not (and probably does not) set the
rate of evolution, unless we define that rate purely as a function of the mutation rate, which would be a circular definition.
Hammegk said:
Could you be a bit more specific? Or is 'evolutionary style' what your next comments are meant to address?
By changes in evolutionary style, I mean the real developments which have emerged (and may still be emerging) as time passes. Examples would include (but not be limited to);-
The switch from non cellular to cellular biota.
The development of multicellular cooperatives and the integration of previously independent organisms within one another.
The related development of parasitic and symbiotic lifestyles at molecular and phenotypic levels and the development of counter measures to parasitism.
The development of plasmid , or other DNA exchange, including the invention of sex.
The development of photosynthesis and the O2 shift in the atmosphere.
The invention of exoskeletons.
The invention of the species - insofar as they exist at all.
There are thousands of such steps- probably gradual enough in reality, but "sudden transitions" seen through the wrong end of the geological telescope. (And we only know about the ones that left fossil evidence).
Each change involved positive feedback into the biosphere in terms of number and type of phenotype. The increase in variety forces more increase in variety. It's an accelerating system, with the main braking agents being tectonic and the odd asteroid. It seems obvious that a model which does not cope with these order of magnitude changes must be incomplete.
Hammegk said:
And now you've moved to arm-waving with a just so story. Sorry.
Hammegk, nobody knows the truth about what went on way back when. I'm speculating, yes. You think I'm the only one here doing that? If I have arms to wave, it's because I'm less fish-like than my ancestors. (I'll tell you about great-uncle Cedric some day).
Hammegk said:
Except the times isolation has been nominated as playing a good part.
In macroscopic speciation. Who was talking about that?
Hammegk said:
Or not ...
Like I say, we're all way out on thin ice here. Pretending we have a mathematical model for a process we barely have begun to understand is wildly speculative. Nothing wrong with that, so long as we all realise it is.
Kleinmann- Yes, I'm sure the creators of the software will improve it if they can, but the way to improve a model of reality is to adapt it till it yields a result that
resembles reality. I applaud the idea of such a model- we have to start somewhere- but I'd be astonished if it was in any sense " right" at such an early stage- and stunned if it had any claim to completeness. So I'm profoundly unsurprised that it gives apparently "wrong" results if we vary the input data.
I think people will still be improving it in a century or so, by which time we may have more complete data for them to model.