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Post by Melanie on Sept 6, 2014 10:24:21 GMT
Hi Argentavis,
thanks for sharing these photos. The only bones of Steller's seacow I've seen so far were in Brunswick (Braunschweig), Germany. Unfortunately my camera was out of order on that day.
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Post by surroundx on Dec 2, 2014 7:49:25 GMT
Rewriting the history of an extinction—was a population of Steller's sea cows (Hydrodamalis gigas) at St Lawrence Island also driven to extinction?Abstract The Kommandorskiye Islands population of Steller's sea cow (Hydrodamalis gigas) was extirpated ca 1768 CE. Until now, Steller's sea cow was thought to be restricted in historic times to Bering and Copper Islands, Russia, with other records in the last millennium from the western Aleutian Islands. However, Steller's sea cow bone has been obtained by the authors from St Lawrence Island, Alaska, which is significantly further north. Bone identity was verified using analysis of mitochondrial DNA. The nitrogen-15 (δ15N)/carbon-13 (δ13C) values for bone samples from St Lawrence Island were significantly (p ≤ 0.05) different from Bering Island samples, indicating a second population. Bone samples were dated to between 1030 and 1150 BP (approx. 800–920 CE). The samples date from close to the beginning of the mediaeval warm period, which could indicate that the population at St Lawrence Island was driven to extinction by climate change. A warming of the climate in the area may have changed the availability of kelp; alternatively or in addition, the animals may have been driven to extinction by the expansion of the Inuit from the Bering Strait region, possibly due to opening waterways, maybe following bowhead whales (Balaena mysticetus), or searching for iron and copper. This study provides evidence for a previously unknown population of sea cows in the North Pacific within the past 1000 years and a second Steller's sea cow extirpation event in recent history. Source: Crerar, Lorelei D. et al. (2014). Rewriting the history of an extinction—was a population of Steller's sea cows (Hydrodamalis gigas) at St Lawrence Island also driven to extinction? Biology Letters 10(11): 20140878. [ Abstract]
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Post by Melanie on Apr 11, 2015 14:00:34 GMT
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Post by surroundx on Jun 8, 2015 13:59:02 GMT
Springer, M.S., A.V. Signore, J.L.A. Paijmans, D.P. Domning, J. Velez-Juarbe, C. Bauer, K. He, L. Crerar, P.F. Campos, W.J. Murphy, R.M. Meredith, J. Gatesy, E. Willerslev, R.D.E. MacPhee, M. Hofreiter and K.L. Campbell. (In Press, 2015). Interordinal gene capture, the phylogenetic position of Steller's sea cow based on molecular and morphological data, and the macroevolutionary history of Sirenia. Molecular Phylogenetics and Evolution. [ Abstract] |
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Post by surroundx on Jun 24, 2015 14:10:01 GMT
Springer, M.S., A.V. Signore, J.L.A. Paijmans, D.P. Domning, J. Velez-Juarbe, C. Bauer, K. He, L. Crerar, P.F. Campos, W.J. Murphy, R.M. Meredith, J. Gatesy, E. Willerslev, R.D.E. MacPhee, M. Hofreiter and K.L. Campbell. (In Press, 2015). Interordinal gene capture, the phylogenetic position of Steller's sea cow based on molecular and morphological data, and the macroevolutionary history of Sirenia. Molecular Phylogenetics and Evolution. [ Abstract] Available free online: www.researchgate.net/profile/Anthony_Signore/publication/277894586_Interordinal_gene_capture_the_phylogenetic_position_of_Steller's_sea_cow_based_on_molecular_and_morphological_data_and_the_macroevolutionary_history_of_Sirenia/links/557882e908aeb6d8c01f172f.pdf |
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Post by surroundx on Oct 3, 2015 10:00:26 GMT
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Post by surroundx on Oct 31, 2015 4:40:20 GMT
Sea otters, kelp forests, and the extinction of Steller’s sea cowAbstract The late Pleistocene extinction of so many large-bodied vertebrates has been variously attributed to two general causes: rapid climate change and the effects of humans as they spread from the Old World to previously uninhabited continents and islands. Many large-bodied vertebrates, especially large apex predators, maintain their associated ecosystems through top-down forcing processes, especially trophic cascades, and megaherbivores also exert an array of strong indirect effects on their communities. Thus, a third possibility for at least some of the Pleistocene extinctions is that they occurred through habitat changes resulting from the loss of these other keystone species. Here we explore the plausibility of this mechanism, using information on sea otters, kelp forests, and the recent extinction of Steller's sea cows from the Commander Islands. Large numbers of sea cows occurred in the Commander Islands at the time of their discovery by Europeans in 1741. Although extinction of these last remaining sea cows during early years of the Pacific maritime fur trade is widely thought to be a consequence of direct human overkill, we show that it is also a probable consequence of the loss of sea otters and the co-occurring loss of kelp, even if not a single sea cow had been killed directly by humans. This example supports the hypothesis that the directly caused extinctions of a few large vertebrates in the late Pleistocene may have resulted in the coextinction of numerous other species. Source: Estes, James A., Burdin, Alexander and Doak, Daniel F. (2015). Sea otters, kelp forests, and the extinction of Steller’s sea cow. PNAS. doi: 10.1073/pnas.1502552112
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Post by koeiyabe on Nov 27, 2015 23:47:22 GMT
 with Spectacled cormorant Rice, Paul, and Mayle, Peter (1981). As Dead as a Dodo |
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Post by koeiyabe on Nov 28, 2015 19:52:09 GMT
 "Living Things Vanished from the Earth (in Japanese)" by Toshio Inomata (1993) with Spectacled Cormorant, Inaccessible Island Rail? (central), and Tristan da Cunha Moorhen. |
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Post by koeiyabe on Dec 12, 2015 15:16:42 GMT
 "The Earth Extinct Fauna (in Japanese)" by Tadaaki Imaizumi (1986) |
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Post by surroundx on Feb 8, 2016 8:25:00 GMT
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Post by Melanie on Feb 15, 2016 16:54:51 GMT
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Post by koeiyabe on Jun 18, 2016 0:19:12 GMT
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Post by surroundx on Oct 1, 2016 8:39:52 GMT
Signore, A. V., Fago, A., Weber, R. E., Morrison, P. R., Brauner, C. J., & Campbell, K. L. (2016). Functional analysis of Steller’s sea cow (Hydrodamalis gigas) hemoglobin provides new insights to cold adaptation. In Oxygen Binding and Sensing Proteins Conference 2016. [ Abstract] |
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Post by surroundx on Dec 17, 2016 8:02:52 GMT
Crerar, Lorelei D., Freeman, Elizabeth W., Domning, Daryl P. and Parsons, E. Christien M. (2016). Illegal trade of marine mammal bone exposed: simple test identifies bones of “mermaid ivory” or Steller’s sea cow ( Hydrodamalis gigas). Front. Mar. Sci.. doi: 10.3389/fmars.2016.00272 [ Abstract] |
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Post by surroundx on Dec 20, 2016 11:49:14 GMT
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Post by surroundx on Jan 2, 2017 9:43:07 GMT
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Post by surroundx on Jan 2, 2017 9:47:59 GMT
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Post by surroundx on Feb 9, 2017 9:49:20 GMT
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Post by surroundx on Apr 23, 2017 3:52:27 GMT
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