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Unable to address any points until after a 2 week ban.
(I will be permanently banned for this reply, no doubt)
Sorry but this board is apparently busy infantilizing their readers so the mods have to work super-hard!
Talk to you later.
To my knowledge this has nothing to do with punctuated equilibrium. Punctuated equilibrium is Gould et al's explanation of data related to the rate of change in response to stressors.
Evolution, fundamentally, is a non-directional process. While "Survival" is the ultimate benefit, survival is not a driving force. Evolution is a passive process in which deficits are removed.
Co-Evolution relates to the interdependence of two systems. As I also pointed out, I do not wish to limit this stressor-stressee to solely biotic systems.
This is crucial and perhaps I misread your original points, but there is no definition of evolution that I am aware of that implicitly or explicity states evolution to be a "directional" process of any sort.
Even co-evolution only relates as far as the stressor-stressee mutual relationship.
It is rational to assume that those factors which select against certain features will result in the proliferation of features that are the opposite of those selected against.
Perhaps you will need to find me a reference in which evolution is capable of "directing" something beforehand.
This is not what happens. Evolution, fundamentally, has only those inputs of genetic mutation, genetic drift, genetic flow and a passive filter to select against them.
Two species that carry between them a "co-evolutionary" relationship are linked in such a way that (let's take for example a lion and a gazelle), the lion is the environmental stressor that selects against slow gazelles or gazelles without sufficient visual acuity to note the presence of the lion. The faster gazelles are, themselves, a selective force against lions incapable of catching faster gazelles (the lion has to eat).
Note how this is not the same as saying Lions make faster gazelles. Faster gazelles make faster lions. It will likely turn out that way, but that is a subtle and very important key difference in how evolution is acting.
The predator-prey relationship is a system of selection factors against mutations that are detrimental.
There is no conception of evolution that I have ever heard of, read about, or learned in any paleo or bio class that meant that there was some "force" driving "toward" any particular goal.
But let's look at all the facts on the table and no theory here.
The only things that life can and are proven to do:
1. Reproduce (imperfectly)
2. Die
The only inputs available to cause any change are genetic factors (mutations, drift) and the only way for these factors to carry forward is through reproduction. If the animal is incapable of reproducing before it dies the mutations it carries or the reproduction-based variability (sexual reproduction as opposed to assexual which will not vary the genetic compositon) will not be passed along.
Again, not to be overly pedantic, but indeed "survival" is the ultimate benefit, but evolution, no matter what model currently accepted by biologists, is not a driving directional force. It is a system by which detrimental features are selected against and removed. This will mean that those that make it through the filter will be capable of survival in that environment and will succeed.
It does not, however, mean that the Angraecoid orchid did anything to force AFrican moths to grow longer proboscii, what it means is that the orchids with deeper flowers were a selection against moths with short proboscii (presumably moths with long proboscii could still work with shallower flowers).
Lamarkism is the process you may be thinking of. In Lamarkism it is the efforts at adapting to an environment undertaken by a life form that help future generations survive. This is largely discredited.
Evolution is a passive process in which factors can only be eliminated, not developed for a particular purpose. Even co-evolution to my knowledge falls under this term. Co-evolution is the relationship, but still dependent upon the fundamental core of evolution's mechanism.
That goes against every Adaptation model, (Evolution is not just Adaptation, at least not in Theory), However, Also note, that Adaptation is more then just Natural Selection.
...
Now I may be confusing what you mean by a “Passive” action, as everything says that “Natural Selection” is a very aggressive, active and exacting process.
I believe this is wrong on many levels.
Evolution is the Process of Adaptations (Directed changes in the Life form to better survive
Genetic Drift, and Adaptation are grinders, they are active as they control the outcome of the next generations,
Drift only has effect on the posterity, where Adaptation affects both the current life and it's posterity.
triggering adaptations
Mutations (Which I give no credit to)
are equally "Grinders" shall we say, as they perform the duty of active change,
to recombine and mutate the DNA strands to see if they will fit though the sieve of "natural selection"
In this case, yes, Evolution has a Sieve, it also has Grinders, and combiners.
And yes, there is direction, just as the sieve works, if you change the sieve, what passes though it will equally change,
The Sieve is not in Stasis,
Hence, the Direction may be viewed as "Pass though the Sieve" that is what all life desires to do.... survive, and to do that, they need to make though the sieve of "Natural Selection"
In statistical inference there are two choices for the scientist:
1. Reject the Null Hypothesis
2. Fail to reject the null hypothesis
(This is not to sound flippant in any way. I really want to make sure we don't end up down the road hashing out a claim that "this animal couldn't adapt this way because it is against the direction of adaptation" etc. etc.
If we allow "direction" then we allow for data not in evidence, ie some external driver to the process.
I can agree to this whole-heartedly. But the animal, in most cases is not aware that it is doing anything in particular. Certainly the flower is not deciding how to leverage its assets to better survive.
Now, here we have the Human, a Land bound, bipedal animal. The question here is, why is Human bipedal and land bound?
The answer is simple, there was stressed placed upon the human species to either walk upright, or die off.
Disadvantages include:
Bipedal walking puts more impact on the ankles, knees and feet this there is a higher risk of wear down and problems, as well as preventing the continual long term maintaining of high speed or even medium speed applications.
Humans possess far less acceleration and a much lower top speed then most quadrupeds
that would prey upon them, as such, they have lost their flight capabilities. This, they have no natural escape from any predator that would consider them to be a meal.
We see that Lucy has feet that are very similar to our own, this she has lost half her climbing abilities, as with all other animals that climb trees, they use both their arms and legs as locomotion up the rough bark, or have heavy reinforced arms that will allow them to climb. Lucy at this point, also does not have the arms necessary to allow for the loss of her feet as a climbing aid.
So being able to climb away to safety equally has been removed from Human flight abilities. Thus we are stuck on land,
I will await the rest of your response.
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No. Bipedalism was not necessarily a prerequisite for survival. It could have been something that came along "for the ride". Remember, my insistence that these stressors cannot cause a positive change but only select against negative results.
Free forelimbs. In vertebrate species, for whom evolution of additional limbs would be an enormous genetic change, it can serve to free the front limbs for such other functions as manipulation (in primates), flight (in birds), digging (giant pangolin), or combat (bears).
Your point is that bipedalism should never have arisen, but that is falling into the trap of assuming bipedalism was a single-positive, rather than either a "ride along" (it came about as a net neutral change) or it came along simultaneous with other adaptations that offset the net "negative" of slowed speeds.
This is where this subtle distinction comes in handy. Bipedalism may not serve an overall "good" in terms of survival, but it certainly cannot be a "negative".
Improved perception. Some evolutionary biologists have suggested that a crucial stage in the evolution of some or all bipeds was the ability to stand, which generally improves the ability to see (and perhaps otherwise detect) distant dangers or resources.
Wading. Raccoons and some primates may adopt a bipedal position in water, allowing them to stand or walk in deeper water while still breathing air.
Faster movement. In animals without a flexible backbone, such as lizards or cockroaches, bipedalism may increase running speed.
Greater reach. Gerunuk antelope adopt a bipedal position to browse the leaves from trees.
Camouflage. It has been speculated that bipedalism in octopuses allows them to move while keeping the rest of their bodies still for camouflage.
Face attacker while directing anal glands. The defense posture of the spotted skunk, which involves walking on its forelimbs, allows the skunk to face the attacker while simultaneously directing its anal glands at them. The anal glands can squirt an offensive smelling oil.
So indeed, while there are down sides, there may also be upsides.
Source:
http://en.wikipedia.org/wiki/Bipedalism
BUT, unlike many quadrupeds, humans do have a larger brain, better static visual accuity, and can climb trees.
Again, speed is not the be-all-end-all of survival techniques.
I have a dog. Presumably a dog or wolf who is not my pet would find me a potential meal or certainly something that could be hunted and killed. What are my advantages?
1. Approximately 6X more detailed vision
2. Higher color gamut perception
(Source: http://www.uwsp.edu/psych/dog/LA/davis2.htm)
3. May have better static vision
Source: http://psychlops.psy.uconn.edu/eric/class/dogvision.html)
Of course the relative value of any adaptation or any physical feature is how well it can be applied. What works to help the dog hunt does not mean that ONLY dogs can hunt, what works for a primate to see does not mean that ONLY primates can see effectively.
Presumably I am even more separated from Lucy than Lucy was from tree-friendly primates, and I can climb a tree. (At least I used to when I was younger, I essentially lived in the trees in our backyard).
Patently false statement. We are demonstrably not stuck on land. In fact, as pointed out earlier, now we can wade into deeper waters because of our bipedalism.
Your bigger brain and your adaptable thought process is your advantage, and if you are like me and not even that smart, your ability to climb a nearby tree is enough to keep you safe. Remember, while we are not as good at climbing trees as a chimpanzee, we are still primates and we share a lot of those skills. And I don't even need a journal article to prove that. As I said, I used to live in the trees in our backyard as a child.
You might wish to read:
http://www.hno.harvard.edu/gazette/2004/11.18/01-running.html
It is a discussion of early hominid running skills. Clearly early hominids were not as pathetic at all things "motile" as you would wish them to be.
But even that aside, I fear you are drifting over into making "special pleadings" against human adaptations.
Humans are fulltime bipedal but in your posts there are no other advantages that humans have.
I believe we have an issue, and it may be because of my many words, and I will have to correct that issue regarding our discussion as I would be truly regretful if it stopped over a small dispute like this.
...
God Bless
Key
Key, the reason you seem to perceive "issues" is because of the way you are attempting to structure the debate. I am fully aware that you have some "plan" overall to try to get me to acquiesce to a specific set of points, the exact ones of which I am unsure just yet, but for that precise reason I am raising as many red flags along the way as I can.
I am no fool, I understand your method of debate. And while you have gone to great lengths to maintain it on an even keel, I am also equally aware that I am being "led". I don't necessarily appreciate this tactic, even when it was done to me by superiors. To that end I am going to fight tooth and nail for every single point.
I realize this sounds somewhat harsh and you would just like for me to make a "misstep" and acquiesce to something so you can make your mysterious point. But it won't happen easily.
I will be fully honest and upfront and hope that I have been so far: I am an atheist and a scientist. One does not necessitate the other, but as both of those things I will not accept any "magical" or "non-natural" "evidence" because no such thing exists.
Suppose you are able to somehow convince me that bipedalism in humans is so very improbable and such a grotesque negative that no amount of other positives could ever outweigh it, you will not convince me it is a de facto sign of the Almighty.
You will gut your own argument in my estimation and you will not convince me otherwise.
If, however, you wish to propose some alternative hypothesis bounded by all of the physics and chemistry at work in the real world, then please do me the very great favor of presenting this hypothesis at this time.
That will save me the annoyance of fighting every single point you raise, no matter how pedantic it appears.
Because in the end pedantic points is all your going to be able to move this forward until you come "clean" and lay out your summary hypothesis.
It is not a debate when you haven't really suggested anything more than "man is not a product of a natural system". In fact that particular hypothesis is exactly equivalent to schizophrenic word-salad. Glossalalia may be fine in church, but it isn't a valid hypothetical stance.
So in order to move this along, make your claim clearly and fully and stop attempting to "lead" me. I barely stood for it when my dissertation committee members attempted to do it to me and they were making a point.
Thanks,
-T.
key said:Hence nature would not select against those that could not maintain this walk, unless there was another reason.
But it has to be a physical reason, not simple static sight, or large brain mass, as both those would be unaffected by posture or walking stance.
So we look at something else, something you brought up, a very integral aspect of our development.
Manipulation, by walking upright, our Hands become free.
In this sense, given the drawbacks of our walk, natural selection would never target that in and of itself as a necessity of survival, however, given the gain of our hands for manipulation, that would be a target of selection.
IE: Those that can not manipulate will die out.
Here is where I ask if you agree, or have objections.
Yes, about that, I really wish you would not fight so hard,
I made a Hypothesis, we are not a product of any natural environment, then, I need to support this Hypothesis. Right now, that is what I am trying to do, support the Hypothesis.
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