本帖最后由 choi 于 8-28-2013 06:47 编辑
(2) Evolution | How the Rhino Got His Woolly; Ice-age giants like the woolly rhino may originally have been Tibetan.
http://www.economist.com/news/sc ... ve-been-tibetan-how Quote: "The last woolly rhino died about 8,000 years ago. Woolly mammoths lasted another 3,500 years, succumbing only when human beings arrived in their Siberian refuges. What no one has known, however, is when and where these animals evolved the eponymous coats that allowed them to range in such high latitudes.
Note:
(a) "How the Rhino Got His Woolly"
(i) wooly (n): "a garment made from wool"
http://www.merriam-webster.com/dictionary/wooly
(ii) The title is a word play on
Just So Stories
http://en.wikipedia.org/wiki/Just_So_Stories
(section 2 Just-So Stories)
(iii) The Economist article is not new but repeats the findings of a 2011 paper (by the same paleontologist listed in (c) below):
Jonathan Amos, 'Oldest' woolly rhino discovered. BBC, Sept 1, 2011
http://www.bbc.co.uk/news/science-environment-14754317
(in Tibet)
(b) "ice began to grip the world 2.6m years ago"
ice age
http://en.wikipedia.org/wiki/Ice_age
(By this definition, we are still in the ice age that began 2.6 million years ago at the start of the Pleistocene epoch, because the Greenland, Arctic, and Antarctic ice sheets still exist)
(c)
(i) "Xiaoming WANG, of the Natural History Museum of Los Angeles County" 王 晓鸣
(ii) "DENG Tao, of the Institute of Vertebrate Palaeontology and Palaeoanthropology in Beijing"
中国科学院古脊椎动物与古人类研究所 邓 涛
(d) "This specimen, found in the Zanda Basin of south-western Tibet, dates from 3.7m years ago—well before the ice ages got going."
(i) Zanda Basin 札达 盆地
(ii) 西藏自治区阿里地区 札达县
阿里地区
http://zh.wikipedia.org/wiki/%E9%98%BF%E9%87%8C%E5%9C%B0%E5%8C%BA
(section 2 行政区划)
(e) "In particular, though its horn [of Tibet specimen] has been lost, the place where it was attached to its skull is flanked by the sort of crest associated with the flat horns of the ice-age woolly rhino."
(i) Woolly rhinoceros
http://en.wikipedia.org/wiki/Woolly_rhinoceros
does not mention the flat horns.
(ii) Shidlovskiy FM et al, Horns of the woolly rhinoceros Coelodonta antiquitatis (Blumenbach, 1799) in the Ice Age Museum collection (Moscow, Russia). Quaternary International xxx: 1-5 (2011)
http://www.rhinoresourcecenter.com/pdf_files/131/1313208377.pdf
(at page 3: "The F-370 specimen justifies Eichwald (1835) suggestion of the flatness of the woolly rhinoceros nasal horn. The presence of two facets of erasure on the front surface of the nasal horn (Fig. 2b) confirms its use for grazing. Wear on the apical part of the frontal horns shows lifetime polish (Fig. 2c). This is very likely the result of tournament battles with the enemy. Possible evidence is found in late Paleolithic cave paintings picturing the battle of two woolly rhinoceroses in the Chauvet Cave (France). The figure shows the nasal horn blow of the right rhinoceros blocked by the frontal horn
of its rival")
(f) "At the moment the Zanda basin is 4,000 metres above sea level. But fossil snails found near the rhino suggest that when it was alive the area was as much as 5,500 metres up. It must therefore have subsided after having been thrown up during the collision of India with Asia, which created Tibet. Such altitude would have produced just the sort of selective pressure needed for woolly coats, flat horns and other adaptations to the cold to evolve."
(i)
(A) Indian Plate
http://en.wikipedia.org/wiki/Main_Page
(B) ONLY IF you wish to read more about where the Indian Plate came from, how it detached from Africa first and Madagascar later--before it drifted toward Asia--see the first four figures of
geology of the Himalaya
http://en.wikipedia.org/wiki/Geology_of_the_Himalaya
(ii)
(A) "The elevation history of the Tibetan Plateau is a source of much debate."
(B) Deng T et al, Locomotive implication of a Pliocene three-toed horse skeleton from Tibet and its paleo-altimetry significance. Proc Nat Acad Sci, 109: 7374-7378 (2012)
http://www.pnas.org/content/109/19/7374.full
("there have been heated debates about the history and process of Tibetan Plateau uplift * * * The Tibetan Plateau has gradually risen since the Indian plate collided with the Eurasian plate about 55 million years ago. Regardless of the debates over the rising process and elevation of the plateau * * * This suggests that the Zanda Basin had achieved an elevation comparable to its present-day elevation by 4.6 Ma [million years, where a stands for annus in Latin] ago")
Taking a snapshot at 4.6 million years, this paper did not discuss the ups and downs of Tibetan Plateau, or Zanda Basin.
(C) Nigel Harris, Tibetan Plateau and its implications for Asian Monsoon. Palaeogeography, Palaeoclimatology, Palaeoecology, 241: 4-15 (2006; review)
http://www.sciencedirect.com/sci ... i/S0031018206003907
(Fig 3 Estimates of the altitude of the surface of the southern Tibetan Plateau)
The figure showed various estimates, by different groups.
(g) "Rhinos are an ancient lineage. The woolly rhino’s closest living ancestor, as proved by looking at the genes of frozen specimens, is the Sumatran rhino. The line these two belong to split from those leading to the other four modern rhino species some 26m years ago, when Tibet was lower than it is now, so the hypothesis of Dr Wang and Dr Deng is plausible."
Sumatran rhinoceros
http://en.wikipedia.org/wiki/Sumatran_rhinoceros |