Extreme insular dwarfism evolved in a mammoth
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چکیده
منابع مشابه
Extreme insular dwarfism evolved in a mammoth.
The insular dwarfism seen in Pleistocene elephants has come to epitomize the island rule; yet our understanding of this phenomenon is hampered by poor taxonomy. For Mediterranean dwarf elephants, where the most extreme cases of insular dwarfism are observed, a key systematic question remains unresolved: are all taxa phyletic dwarfs of a single mainland species Palaeoloxodon antiquus (straight-t...
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The islands of Bocas del Toro, Panama, were sequentially separated from the adjacent mainland by rising sea levels during the past 10,000 years. Three-toed sloths (Bradypus) from five islands are smaller than their mainland counterparts, and the insular populations themselves vary in mean body size. We first examine relationships between body size and physical characteristics of the islands, te...
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It is a well-known phenomenon that islands can support populations of gigantic or dwarf forms of mainland conspecifics, but the variety of explanatory hypotheses for this phenomenon have been difficult to disentangle. The highly venomous Australian tiger snakes (genus Notechis) represent a well-known and extreme example of insular body size variation. They are of special interest because there ...
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Camptomelic dwarfism or dysplas1a is a rare syndrome in which· short stature is associated with angulation and bowing of the lower limb Long bones, hypoplasia of the facial bones and scapula and various other skeletal and respiratory and nervous system. A 9 day old girl with this syndrome was admitted in our peiatric Department, Loghman Hospital medical center because of Dwarfism and hypotonia....
متن کاملDwarfism In Beef Cattle.
tongue, (3) apparent muscular weakness, (4) incoordinated movement, and (5) proportionally short legs. The length of forecannon has proved to be the most accurate method of identifying the living dwarf calf at birth. Genetic studies were made to learn if dwarfism in beef cattle was inherited or if it was caused by faulty nutrition. In these genetic studies, cows that had previously dropped dwar...
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ژورنال
عنوان ژورنال: Proceedings of the Royal Society B: Biological Sciences
سال: 2012
ISSN: 0962-8452,1471-2954
DOI: 10.1098/rspb.2012.0671