scholarly journals Characteristics of bark-stripping of Hinoki cypress (Chamaecyparis obtusa) trees by Japanese black bear (Ursus thibetanus japonicus) and development of wood decay

2016 ◽  
Vol 42 (1) ◽  
pp. 74-79
Author(s):  
Jyunichi OHSHIMA ◽  
Masashi YANAGISAWA ◽  
Kazuya IIZUKA ◽  
Futoshi ISHIGURI ◽  
Shinso YOKOTA
Keyword(s):  
Wood Decay ◽  
Black Bear ◽  
Bark Stripping ◽  
Hinoki Cypress ◽  
Ursus Thibetanus

Bark stripping behavior in relation to Fagaceae mast production and diet in the Asiatic black bear (Ursus thibetanus)

2020 ◽  
Vol 25 (6) ◽  
pp. 450-455
Author(s):  
Tomoki Mori ◽  
Rina Sugiura ◽  
Makoto Kato ◽  
Kensuke Miura ◽  
Haruna Ogawa ◽  
...  
Keyword(s):  
Black Bear ◽  
Bark Stripping ◽  
Asiatic Black Bear ◽  
Ursus Thibetanus ◽  
Mast Production

Behaviour of Asiatic Black Bear (Ursus thibetanus) and Crop Damage in the Forage Corn Field

2003 ◽  
Vol 74 (3) ◽  
pp. 383-388 ◽  
Author(s):  
Yoshitaka DEGUCHI ◽  
Shusuke SATO ◽  
Kazuo SUGAWARA
Keyword(s):  
Black Bear ◽  
Crop Damage ◽  
Asiatic Black Bear ◽  
Ursus Thibetanus ◽  
Corn Field

Seasonal variation in fleshy fruit use and seed dispersal by the Japanese black bear (Ursus thibetanus japonicus)

2007 ◽  
Vol 23 (2) ◽  
pp. 471-478 ◽  
Author(s):  
Kazuaki Takahashi ◽  
Tadatoshi Shiota ◽  
Hiroo Tamatani ◽  
Masaru Koyama ◽  
Izumi Washitani
Keyword(s):  
Seasonal Variation ◽  
Seed Dispersal ◽  
Black Bear ◽  
Fleshy Fruit ◽  
Ursus Thibetanus

scholarly journals Immunolocalization of steroidogenic enzymes in the corpus luteum and placenta of the Japanese black bear, Ursus thibetanus japonicus, during pregnancy

Reproduction ◽  
2001 ◽  
pp. 587-594 ◽  
Author(s):  
T Tsubota ◽  
S Taki ◽  
K Nakayama ◽  
JI Mason ◽  
S Kominami ◽  
...  
Keyword(s):  
Cytochrome P450 ◽  
Corpus Luteum ◽  
Fetal Development ◽  
Black Bear ◽  
Corpora Lutea ◽  
Luteal Cells ◽  
Ursus Thibetanus ◽  
Delayed Implantation ◽  
Post Implantation ◽  
Implantation Period

The Japanese black bear, Ursus thibetanus japonicus, is a seasonal breeder and shows delayed implantation for several months during pregnancy. The objective of this study was to clarify the steroidogenic capability of the corpus luteum and placenta during pregnancy, including both delayed implantation and fetal development, by immunolocalization of steroidogenic enzymes in these organs of the Japanese black bear. Ovaries and placentae from 15 wild Japanese black bears, which had been killed legally by hunters and were thought to be pregnant, were used in an immunocytochemical study to localize the cholesterol side chain cleavage cytochrome P450 (P450scc), 3beta-hydroxysteroid dehydrogenase (3betaHSD), 17alpha-hydroxylase cytochrome P450 (P450c17) and aromatase cytochrome P450 (P450arom) by the avidin-biotin-peroxidase complex method using polyclonal antisera raised in mammals against P450scc, 3betaHSD, P450c17 and P450arom. P450scc and 3betaHSD were localized in all luteal cells throughout pregnancy. P450c17 was present in a few luteal cells, especially in the outer area of the corpus luteum throughout pregnancy, but the number of positively immunostained cells decreased during the post-implantation period. Cells positively immunostained for P450c17 were significantly smaller than negatively immunostained cells (P < 0.01). P450arom was present sporadically in a few luteal cells throughout pregnancy, but the number of positively immunostained cells decreased during the post-implantation period. The size of cells positively immunostained for P450arom was not significantly different from that of negatively immunostained cells. The whole placenta was negatively immunostained for P450scc, 3betaHSD and P450c17, but P450arom was present in the syncytiotrophoblasts and endothelial cells of maternal blood vessels. These results indicate that, in the Japanese black bear, corpora lutea are a source of progesterone which may play an important role in the maintenance of delayed implantation and fetal development during pregnancy. Corpora lutea have a minimum capability to synthesize androgen in small luteal cells and oestrogen in normal-sized luteal cells during pregnancy, and placentae have the ability to synthesize oestrogen during late pregnancy.

Childbirth and rearing characteristics of an Asiatic black bear (Ursus thibetanus ussuricus) with trauma disorder in the wild

2019 ◽  
Vol 37 (4) ◽  
pp. 467-473 ◽  
Author(s):  
Jeong-Jin Kim ◽  
Tae-Wook Kim ◽  
Ju-Yeol Choi ◽  
Seuong-Hoon Chae ◽  
Kwang-sun Moon ◽  
...  
Keyword(s):  
Black Bear ◽  
Asiatic Black Bear ◽  
Ursus Thibetanus ◽  
In The Wild
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