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Asian black bear

Species of bear

  • 34 min read
  • 7 chapters
Animal species: Asiatic Black Bear ( Wrocław zoo)
Guérin Nicolas ( messages ) · CC BY-SA 3.0

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Taxonomy

Ancestral and sister taxa

Biologically and morphologically, the Asian black bear represents the beginning of the arboreal specializations attained by sloth bears and sun bears. It has karyotypes nearly identical to those of the five other ursine bears, and has 74 chromosomes. It is considered the least derived of the Old World bears. It is either a surviving, albeit modified, form of Ursus etruscus, specifically the early, small variety of the Middle Villafranchian or a larger form of Ursus minimus, an extinct species that arose 4 million years ago. With the exception of the age of the bones, it is often difficult to distinguish the remains of Ursus minimus with those of the modern Asian black bear.

The Asian black bear and the American black bear are thought to have genetically diverged 3 million years ago, though genetic evidence is inconclusive. Both the American and Asian black species are considered sister taxa and are more closely related to each other than to the other bear species. The earliest known Asian black bear specimens are known from the early Pliocene in Moldova. The earliest American black bear fossils found in Pennsylvania greatly resemble the Asian black bear. Investigations on the mitochondrial cytochrome b sequence indicate that the divergence of continental Asian and Japanese black bear populations might have occurred when bears crossed the land bridge between the Korean Peninsula and Japan 500,000 years ago, which is consistent with paleontological evidence.

Subspecies

Until the Late Pleistocene, two further subspecies ranged across Europe and West Asia. These are U. t. mediterraneus from Western Europe and the Caucasus and U. t. permjak from Eastern Europe, particularly the Ural Mountains.

Hybrids

Asian black bears are reproductively compatible with several other bear species, and have on occasion produced hybrid offspring. According to Jack Hanna's Monkeys on the Interstate, a bear captured in Sanford, Florida, was thought to have been the offspring of an escaped female Asian black bear and a male American black bear, and Scherren's Some notes on hybrid bears published in 1907 mentioned a successful mating between an Asian black bear and a sloth bear. In 1975, within Venezuela's "Las Delicias" Zoo, a female Asian black bear shared her enclosure with a male spectacled bear, and produced several hybrid descendants. In 2005, a possible Asian black bear–sun bear hybrid cub was captured in the Mekong River watershed of eastern Cambodia. An Asian black bear/brown bear hybrid, taken from a bile farm, is housed at the Animals Asia Foundation's China Moon Bear Rescue as of 2010.

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