Japanese black bear

The Japanese black bear (Ursus thibetanus japonicus) is a subspecies of the Asian black bear that lives on two main islands of Japan: Honshu and Shikoku. There are an estimated 10,000 black bears in Japan. The population of black bears on Shikoku is endangered at less than 30 individuals and the last confirmed sighting of a bear on the island of Kyushu was in 1987, making them likely extinct on the island prior to the 21st century.[2] There is a high price on bear parts in the black market, which threatens all bear populations in Japan. This particular species of bear are typically smaller, with males only reaching 60–120 kilograms (130–260 lb) and females only weighing about 40–100 kilograms (88–220 lb). Their body length is about 120–140 centimetres (47–55 in) long.

Japanese bear

Vulnerable  (IUCN 3.1)[1] (Kyoto prefecture)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Ursidae
Genus: Ursus
Species:
U. thibetanus
Subspecies:
U. t. japonicus
Trinomial name
Ursus thibetanus japonicus
Schlegel, 1857
Synonyms

Selenarctos thibetanus japonicus

Diet
Bear eating plants in the area of Mount Norikura

These bears are typically herbivorous, eating mainly grasses and herbs during the spring. During the summer, they switch to berries and nuts to feed themselves for their hibernation. The bear is able to get the berries and nuts by climbing trees and using their claws to grab the food. These animals can be omnivorous and eat other wild animals and livestock when there is a need.[3] Typical prey species include Japanese serow[4] wild boar, and sika deer. Like other bears, cannibalism occurs, as has been demonstrated when bone fragments and claws of a cub were found inside the stomach of a male black bear. They have also been documented consuming invasive species such as nutria.

Habitat
In the area of Mount Kurai

The bears live on two Japanese islands: Honshu and Shikoku. They can be found in the northeastern high snow region and the southwestern low snow region; however, they have been spotted as high as the alpine region more than 3,000 metres (9,800 feet) high. They tend to live in areas where there is an abundance of grasses and trees with berries to support their diet.[3]

Seed dispersal

Forests rely on bears as a great method for plants and trees to spread their seeds. The bears will consume the seeds and move 40% farther than a distance of 500 m from the parent tree. They have the potential to spread seeds over huge areas, helping the plant life spread throughout the area. In autumn, the bears have a greater seed dispersal rate and usually the males have a larger dispersal areas than females.[5]

Conservation

There has been a huge impact on Japanese black bears' populations due to human interference. Habitat destruction is a problem for these bears as peoples' villages begin to grow. Over-hunting and poaching is also a problem. Bears' parts can be sold on the black market for a high price, which makes them very desirable. People kill a lot of these bears, reducing their numbers drastically. Because of this and the carrying capacity reduction due to habitat destruction has resulted in the recognition that the Japanese black bear is at a high risk of extinction. The subspecies will likely be gone within the next 100 years at the rate they are currently declining.[6]

References
  1. "Kyoto Red List". www.pref.kyoto.jp.
  2. "Seeking Balance with the Bear". Nippon. February 1, 2018.
  3. (Hazumi 1994)
  4. "Diet and feeding habits of Asiatic black bears in the Northern Japanese Alps".
  5. (Koike, S. 2011)
  6. (Horino, S. 2000)

Bibliography
  • Hazumi, Toshihiro (1994). "Status of Japanese black bear". Bears: Their Biology and Management. Vol. 9. International Association for Bear Research and Management. pp. 145–148. doi:10.2307/3872694. JSTOR 3872694.
  • Horino, S.; Miura, S. (2000). "Population viability analysis of a Japanese black bear population". Population Ecology. 42 (1): 37–44. doi:10.1007/s101440050007. S2CID 38285591.
  • Koike, Shinsuke; Masaki, Takashi; Nemoto, Yui; Kozakai, Chinatsu; Yamazaki, Koji; Kasai, Shinsuke; Nakajima, Ami; Kaji, Koichi (2011). "Estimate of the seed shadow created by the Asiatic black bear Ursus thibetanus and its characteristics as a seed disperser in Japanese cool-temperate forest". Oikos. 120 (2): 280–290. doi:10.1111/j.1600-0706.2010.18626.x.
  • Shigeru Azuma; Harumi Torii (February 1977). "A Selection of Papers from the Fourth International Conference on Bear Research and Management". 4. Kalispell, Montana, the USA: 71–79. {{cite journal}}: Cite journal requires |journal= (help)
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.