CEngelbrecht wrote:I'm desperately trying to remember who coupled bipedalism ermerging in freshwater habitats first (Sahel.?, 7mya), and encephalization emerging in salt water second (Homo, 2mya)?
Was it Cunnane, Ellis, Niemitz, Verhaegen? Sorry, I'm mixing all the names together sometimes.
CEngelbrecht wrote:Oh, okay. Now it sounds like I made have concocted some of it myself (now I'm like Chan). The point is to answer the criticism of arguing both bipedalism and encephalization as aquatic, which occured at quite different time frames.
CEngelbrecht wrote:For all the heckling, user Menyambal (reply 1016 in the PZ Myers thread actually had a good comment:
Making the transition from salt to fresh can be done in evolutionary time, and even in a salmon’s lifetime, but the iodine and DHA that we supposedly need aren’t to be found in the rivers of the world. Indeed, the moist American Great Lakes region was one of the two worst places in the US for iodine shortages. The Pacific Northwest, also rainy and rivery and swampy, was the other. Algis’s river waddlers would have been hardest hit by Engelbrecht’s iodine shortage.
It would make sense when coupling Cunnane et al's micronutrient studies, that because DHA and Iodine are in shorter supply in fresh water food chains, then bipedalism can occur early in fresh water habitats, because bipedalism is only dependent on a shallow water habitat, which can be either fresh, brackish, alcalic or saline (which would be for simians specifically, some peculiar exaptation to our mutual brachiating origin, e.g. all the way back from Proconsul).
Conversely, encephalization is dependent on either alcalic (vulcanic lakes along the Rift, I mean) or saline habitats, ’cause those habitats contains food chains with much more DHA and iodine. Because the hominins (subtribe australopithecinae) lived in fresh water first (7-1mya), and then a branch of these (subtribe Hominina) took off and adapted to alcalic lakes or possibly a salt water flooded Afar depression (2.5mya and onward), then their brain could take off in size. ‘Cause now the foodchains could support it, as we see it in other big-brained aquatic and semiaquatic mammals.
(Just copying what I already wrote there.)
Why did you split human evolution into two different habitats, river apes --> coastal people? Was that purely from the locations of the fossils?
Have I understood it correct, that the Afar/Danakil depression was flooded by sea water and made into a tropical archipelago during that key stage 2.5-2mya at the emergence of Homo and increasing encephalization? Is that Elaine arguing that? 'Cause with this, I feel like saying, "Oh yeah. It's all coming together."
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