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[QUOTE]Originally posted by DD'eDeN: [QB] "The results suggest the possibility that human terrestrial life began inside a forest rather than in the savannah." "Why did our hominin ancestors descend from the trees to the forest floor?" Acquisition of terrestrial life by human ancestors influenced by forest microclimate Hiroyuki Takemoto 2017 Scientific Reports 7:5741 doi 10.1038/s41598-017-05942-5 - - - I've been saying for years: Original hominins were chimps that about 5ma began adaptation of living on the rainforest floor, moving from the standard great ape forest canopy bowl nest, and did not live on grassland open plains until recently. Hominins made ape-like bowl nests [b]portable[/b] ((food)BA[b]SKET[/b]/(predator)SHIELD/(rain)SHED/(sun)SHADE/SHUTTLE) of sharp-tipped pliable sticks & broad-leaves, and moved along the rainforest floor in nomadic groups, sleeping beneath these shields / shallow-dome huts near crystalline streams devoid of crocs. - - - (article, with comments from MV & DD) The common ancestor of the Pan and human lineages is thought to have been an arborealist,(aquarborealist --mv)/(H/P arborealist with seasonal flooding DD) and all early hominin fossils have been found in forest patches or environments close to forests.(wetland Reed 1997 JHE --mv)/(mostly forest DD) Fossils of Ardipithecus ramidus, an early-stage human ancestor(?? --mv)/(yes, cf. canine teeth with fused roots cf Greicopithecus 7.2ma DD) after divergence from the Pan clade 4.4 Ma, prove that it adopted conditions involving terrestrial upright bipedality, and foraging in trees. Ar.ramidus thus demonstrates(?? --mv)/(yes, cont'd from Morotopithecus DD) that the human lineage never experienced knuckle-walking like that of modern chimpanzees or gorillas. Modern ape locomotion studies have shown that bipedalism can happen in an arboreal context to enable reaching flexible branches, although modern ape bipeds are not accompanied by anatomical specializations for upright bipedal locomotion. The above evidence may indicate that bipedalism, terrestriality & open habitat are not necessarily linked; and a partially terrestrial lifestyle in early hominins started in the time period when forests were still the main habitat for humans. IOW, the beginning of terrestrial life will be explained independently from the establishment of bipedalism or expanding into open habitat. However, there have been no reports about the ecological factors contributing to the transition from arboreal to terrestrial life inside forests during the course of human evolution. Why did our hominin ancestors descend from the trees to the forest floor? - - - See my writings. DD DD'eDeN [/QB][/QUOTE]
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