amor_fati wrote:Seems pretty clear that these plants produce tryptamines because the line of tryptamine producing ancestors was favored over that of the alternative. This is likely due to a combination of some animals propagating them (unwittingly, or by cultivation) and some animals not tampering with them (pest-repelling properties, for instance). Evolution happens firstly by random genetic mutation and secondly by survivability of traits. I'm fairly certain that evolutionary biology doesn't extend much past that yet, as in, claims of purpose-driven evolution are still unfounded.
Yeah evolution does indeed involve in some cases random genetic mutation and secondarily survivability of traits.
Mendels and Frisher/Wright/Haldane did some good math to show how this can [and does in many cases] work.
However there are fundamental logical problems and major holes (to put it mildly) in the Neo-Darwinian [ND] argument
The majority of ND arguments actually confuse the issue due to jumping between mechanistic arguments (basically that the sum of it's parts / a complex machine), and teleological explanations (purpose driven).
this leads to the fundamental problem of an antinomy (contradiction between 2 laws) in relation to explanations of organisms.
the result of this is that the research programs enacted by many biologists and the forms of explanation used tend to be created/used to back up the basic hypothesis that
a] evolution is the pretty much exclusively the result of compounded random genetic mutations
b] those who are likely to survive are those with a beneficial trait.
however,
[and this is so often the case with biology (and makes it as frustrating as much as it makes it super fun)]
Organisms have so many exceptions to this 'rule' and the ND explanatory system is so fundamentally flawed that biology is now having to seriously look at developing a new system where the ND paradigm is revised, modified and may very well just be a smallish subset in relation to the actual understanding of the evolutionary process.
Take for example Newt limb regeneration.
1 - an ancestral newt gets its limb bitten off.
2 - due to a random genetic mutation it partially grows back [i.e. the standard 'ND micromutation' model], so it has 3 and a little bit legs
3 - this apparently puts it at a 'selective advantage' over its 4 legged comrades, and it has more offspring
4 - progressively over millenia this same process happens again and again, each time one of the progeny whos leg is bitten off has a little bit more growth, and although this regenerated limb is still not full size or useable it is at a selective advantage.
5 - this happens repeatedly until one day after many many random mutations in the limb regeneration area and leg bites we have the nests we see today.
the moral of this story [and for ND] is that just because we can select for animals quite successfully to produce new forms, and make up studies, experiments and mathematical models to show how this argument could work it in no way means that nature works this way.
another classic example is stripes of animals, (e.g. tigers)
standardly they have been described as operating under a mathematical system developed by Alan Turing that works beautifully,
however, if you study the embryology you find that the system in nature is quite different.
so in summary, the ND argument of selective traits can be argued not to in fact be an evolutionary argument per se [especially as it doesn't have a developmental component].
I spose as an extra example,
Lots of people claim that the world is just as we see it, rocks, trees, tv, microwave dinners.
but then you experience DMT and find out there is a whole lot more going on and a lot of the standard accepted rules don't really apply and we need a substantial revision of our world view.
If anyone is interested in some of the newer perspectives going on in evolutionary theory (the subject I'm doing my doctorate in) and how much it has changed from the selection of traits, random mutation etc check out stuff by
Lynn Margulis
Brian Goodwin
Antonio Lima-de-Faria
Stuart Kauffman
David Lambert
Stan Salthe
Soren Lovtrup
all highly respected professors in the field of evolutionary theory
cheers : )