Calilasseia wrote:Jayjay4547 wrote:
The article in question is Treves and Palmqvist’s chapter Reconstructing Hominin Interactions with Mammalian Carnivores
http://faculty.nelson.wisc.edu/treves/p ... t_2007.pdf
I know. I saved the paper when you first linked to it
I know you know, I cited the article again so that anyone else wouldn’t be left in the dark about what would look like a private conversation.
Calilasseia wrote:Jayjay4547 wrote:Treves and Palmqvist deal authoritatively with predator avoidance by the hominins, including alertness, warning calls, mobbing and staying away from dangerous areas. What they don’t deal with is circumstances where other primates bite and where the hominins were not adapted to bite.
Except that, Treves & Palmqvist explicitly state in their paper, that those other primates have been observed USING DIFFERENT TECHNIQUES for the purpose. And, furthermore, that many of those techniques arise from the models of social organisation extant in those primate species. Which is the data YOU have been ignoring.
successful avoidance of close contact with dangerous, well-armed predators will yield more dividends than head-on confrontation. If members of a species develop a collection of social behaviours that minimise this risk of close contact, and therefore mean that they don't have to resort to combat in order to stay alive, a process that is always risky even for the most well-equipped, then those individuals are going to stand more chance of surviving and reproducing, than individuals who don't develop this collection of behaviours. The latter, quite simply, will end up as lunch for something else. Plus, Treves & Palmqvist provided in their paper, the elementary observation that an organism subject to a surprise ambush attack, will have far fewer opportunities for self-defence, than an organism possessing advance warning of a predator's presence from some distance away. …As McDonnell Douglas said in their advertising blurb for the RAH-66 Comanche stealth helicopter, before it was cancelled:
"If the enemy can't see you, the enemy can't hit you. If the enemy can't hit you, the enemy can't kill you".
Consequently, remaining inconspicuous but vigilant, means you largely avoid the need for combat. If you're part of a group, engaging in this behaviour co-operatively, with appropriate signalling between group members, you're likely to avoid the need for combat even more. Alternatively, if you're dealing with a predator that relies upon surprise, signalling to that predator that it's been spotted, and is therefore wasting its time on you, also pays dividends with respect to avoidance of the need for combat…picking a fight with a lion, equipped with more muscle mass than you, better teeth than you, better claws than you, and the and the motivation of hunger, is a suicide enterprise.
All that was more economically and authoritatively said by Treves and Palmqvist and even more economically summarized by me when I said they deal authoritatively with predator avoidance by the hominins, including alertness, warning calls, mobbing and staying away from dangerous areas.
You accuse me of ignoring that many of antipredation techniques arise from the models of social organisation extant in those primate species. Not so. I’m just saying that for an adequate modeling of hominin-predator relations, one would need to look specifically at the circumstances where other primates bite while hominins weren’t adapted to bite.
Calilasseia wrote:Jayjay4547 wrote:
I see that issue [in Scientific American] had a article by Ian Tattersall pointing out that Homo sapiens is the sole survivor from a number of sympatric hominins. The monotonic trend I was referring to is different, it’s towards representing our ancestors as active and unforced in their own evolution.
one of the central ideas endemic to evolutionary theory [is that], external influences affect the genetic destiny of populations.
All the more remarkable then, if the narrative of human evolution is told with reference only to how hominin troops adapted by organisation within the troop and in ways common to other primate species.
Calilasseia wrote:Jayjay4547 wrote:That trend is visible in the development of Raymond Dart’s interpretation of Austropithecus Africanus. In 1925 he interpreted the hominin limbs in this way:
“Bipedal animals, their hands were assuming a higher evolutionary role not only as delicate tactual, examining organs which were adding copiously to the animals knowledge of its physical environment, but also as instruments of the growing intelligence in carrying out more elaborate, purposeful and skilled movements, as organs of offence and defence. The latter is rendered more probable, in view, first, of their failure to develop massive canines and hideous features, and, secondly, of the fact that even living anthropoid apes can and do use sticks and stones as implements as and weapons of offence.(“Descent of Man”, p81 et seq.)”
…you're treating an out of date work as purportedly the last word on the subject. You do realise that scientists continued researching this topic after 1925?
I was presenting the case for a trend, by discussing a change in the presentation of human evolution. Dart was my starting point. His analysis of the Taung child is about as pure a case as one could wish for of a scientist focusing on evidence. Thanks to that focus he saw further than his metropolitan critics. But I’m arguing that he was working in an ideological blizzard.
Calilasseia wrote:
Jayjay4547 wrote:Out of this vision, Dart developed the hunting hypothesis, which was all about offence; an acting on the world under the will of the hunter whereas defence is a forced reaction to the will of the predator.
But … later scientists alighted upon data overturning that idea.
I’m arguing that wasn’t the case; actually later scientists ignored data which was the lack of hominin fangs.
Let’s look at the data that Treves and Palmqvist actually bring out.
Calilasseia wrote:
Jayjay4547 wrote:the significance of “purposeful and skilled movements” has been forgotten and the lack of canines that could be used for defensive biting and that Dart had carefully noted, hardly gets a mention :
let's highlight relevant parts of the paragraph you're quoting here”Chimpanzees have pursued and even killed cornered leopards (Boesch & Boesch, 1981; Hiraiwa-Hasegawa et al.,1986). Chimpanzees have attacked stuffed leopard models with sticks and stones (Kortlandt, 1980, 1989). However, healthy lioness-sized or larger carnivores may be too formidable, even for male apes in groups (Tsukahara, 1993). Counterattack with hand weapons may be an especially effective anti-predator tactic in some situations, but we have very little systematic evidence of this. It is doubtful that simple projectiles can deter coursing predators that do not abort pursuit easily or packs of carnivores emboldened by their own numbers[/color=red]. [color=blue]Moreover, a weapon does not provide protection if its wielder is surprised. Therefore, we doubt that hominins counterattacked carnivores in packs or lion-sized carnivores in the Pliocene”.
In short, the authors are saying "where is the DATA to support that hypothesis?"
It should have occurred to those authors that the lack of fangs in australopithecus, paranthropus and homo constituted systematic evidence. Just as one wouldn’t need to find a bone stuck in the teeth of T. Rex to regard those teeth as systematic evidence that it was a carnivore. It should have occurred to them to address that issue. It should have occurred to their book editor to raise it. It’s noteworthy that this didn’t happen.
The passage above shouldn’t be read naively. The authors are out to show that they aware of the prospect that hominins used weapons to defend themselves (“counterattack” as they put it) while dissing that idea as unevidenced. They conclude their discussion of what hominins did after encountering predators, by saying what the hominins didn’t do. And part of this strategy is to “doubt” that the hominins could have defended against the most formidable predators –the same unreasonable approach that you have used.
Calilasseia wrote:
Jayjay4547 wrote:Although there are records of other primates using sticks as weapons, I don’t know of a record of them injuring predators using weapons. Kortlandt measured the speed at which a chimp struck a leopard and declared that could break its back but his film clip just suggests incompetent use of sticks.
So you want to try and argue that Australopiths used weapons, yet admit yourself that a video clip of an evolutionary relative in action in this mode was not helpful to your hypothesis?
The problem is that chimps have fangs. That they use sticks at all is suggestive of how early hominins might have started defending themselves using hand weapons. But their naïve and incompetent use of sticks shows that their bodies including their nervous system and that including their brains, isn’t adapted into a weapon using habit. But the lack of hominin fangs shows that these human ancestors were so adapted. When primate antipredation comes down to a contact stage its either fangs or sticks-and-hand-axes.
Calilasseia wrote:
Jayjay4547 wrote:But other primates do bite highly competently. We know that instinctively. Absolutely no one is going to try to grab a vervet monkey that he has trapped raiding the kitchen. Let alone trying to grab a baboon.
here’s a 45 minute documentary on a special ecosystem in the Rift Valley. One which features lions that eat baboons. The first strike starts at 20:20, and concludes at 20:50. One dead baboon ending up as lion food. Likewise from 43:00 to 44:15 - another dead baboon winding up as lion food.
The fact that lions kill buffaloes doesn’t mean that buffalo horns are irrelevant in antipredation. They restrict the techniques a lion can use, force the lion to learn particular skills against this prey sort. And those horns limit the predator species that dare attack a buffalo. Similarly, the fact that lions kill baboons doesn’t mean that their fangs are irrelevant to antipredation. Here’s (again) a clip of a lone baboon successfully holding off a lioness, until other lions arrived.
Your clip showing how fearsome a tiger is, is irrelevant to picturing the ecology of the hominins. Our ancestors lived in the larder of a range of predators of different threat levels, including these identified by Treves and Palmqvist:
No doubt, the hominins seldom tried to fight off Nile crocodiles and at the other extreme, they didn’t fear suricates but somewhere in the range between and in some circumstances, like all primates, they must have defended themselves at the contact stage of predation. The point of my thought experiment about the vervet in your kitchen was to demonstrate how significant primate fangs are. Instinctively we know not to tangle barehanded with a fanged primate one tenth our own body weight.
Yes that’s what they say, while strangely ignoring the data about the lack of fangs in australopiths, and the high importance of fangs in other primates.
Calilasseia wrote:
Jayjay4547 wrote:That significance is high: it would have forced hominins to select the best sticks and stones, to have carried them around wherever there was a danger from predators, and use them with purpose and skill equivalent to that by a vervet cornered by a dog in a kitchen.
Except that, wait for it, THE DATA DOES NOT SUPPORT THIS.
See my response above.
I’m not certain that hominins defended against lions any more than baboons do, at least, in all circumstances. There isn’t evidence about that. There is evidence that the hominins were sympatric with a range of predators, that they didn’t have fangs and that other primates, who do have fangs, know how to use them defensively.
Calilasseia wrote:
Jayjay4547 wrote:What isn’t known and is thereby interesting, is that the scientific narrative of human evolution has also been influenced by an opposite ideology.
Bollocks. Once again, this is a bare faced lie you're posting here, and a defamatory one at that. The only thing that affects the scientific view of evolution is DATA. Now drop this disgusting lie you keep posting once and for all.
In this passage I left your overbearing traducing of me because it shows the extraordinary level of your presumption about the authority of what scientists say. You claim its defamatory for a layman to criticize a published article. It’s implausible to claim as you do that the only thing that affects the scientific view of evolution is data. Brian Switek, the author of several books on evolution, put it this way in his review of “Man the Hunted”:
http://scienceblogs.com/laelaps/2009/06/14/book-review-man-the-hunted/
If there is any science that is influenced by our cultural background, expectations, and desires it is anthropology, and we must take care to make sure that what we want to be true doesn’t obscure our vision.
You are way out of line