Tsuyoshi Ishinazaka
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View article: Estimation of breeding population size using DNA‐based pedigree reconstruction in brown bears
Estimation of breeding population size using DNA‐based pedigree reconstruction in brown bears Open
Robust estimates of demographic parameters are critical for effective wildlife conservation and management but are difficult to obtain for elusive species. We estimated the breeding and adult population sizes, as well as the minimum popula…
View article: Diet selection and asocial learning: Natal habitat influence on lifelong foraging strategies in solitary large mammals
Diet selection and asocial learning: Natal habitat influence on lifelong foraging strategies in solitary large mammals Open
Exploring the process of diet selection will contribute to improvement in our understanding of animal foraging strategies. The overwhelming majority of ecological research on animal learning and foraging concentrates on how social learning…
View article: Estimation of breeding population size using DNA-based pedigree reconstruction in brown bears
Estimation of breeding population size using DNA-based pedigree reconstruction in brown bears Open
Robust estimates of demographic parameters are critical for effective wildlife conservation and management, but are difficult to obtain for elusive species. We estimated the breeding and adult population sizes, as well as the minimum popul…
View article: Diel and monthly activity pattern of brown bears and sika deer in the Shiretoko Peninsula, Hokkaido, Japan
Diel and monthly activity pattern of brown bears and sika deer in the Shiretoko Peninsula, Hokkaido, Japan Open
Mammals exhibit several types of diel activity pattern, including nocturnal, diurnal, crepuscular, and cathemeral. These patterns vary inter- and intra-specifically and are affected by environmental factors, individual status, and interact…
View article: Stable isotope data on brown bear hairs and food items on the Shiretoko Peninsula, Hokkaido, Japan.
Stable isotope data on brown bear hairs and food items on the Shiretoko Peninsula, Hokkaido, Japan. Open
These are data sets on stable isotope diet analysis on brown bears on the Shiretoko Peninsula, Hokkaido, Japan, which were used in the study on Jimbo et al. (2022), Ecosphere.●Jimbo et al_2022_Shiretoko Bear Hair.csv●Jimbo et al_2022_Shire…
View article: Dining from the coast to the summit: Salmon and pine nuts determine the summer body condition of female brown bears on the Shiretoko Peninsula
Dining from the coast to the summit: Salmon and pine nuts determine the summer body condition of female brown bears on the Shiretoko Peninsula Open
Body condition in mammals fluctuates depending on energy intake and expenditure. For brown bears ( Ursus arctos ), high‐protein foods facilitate efficient mass gain, while lipids and carbohydrates play important roles in adjusting dietary …
View article: Development of a noninvasive photograph-based method for the evaluation of body condition in free-ranging brown bears
Development of a noninvasive photograph-based method for the evaluation of body condition in free-ranging brown bears Open
Body condition is an important determinant of health, and its evaluation has practical applications for the conservation and management of mammals. We developed a noninvasive method that uses photographs to assess the body condition of fre…
View article: Peer Review #1 of "Development of a noninvasive photograph-based method for the evaluation of body condition in free-ranging brown bears (v0.1)"
Peer Review #1 of "Development of a noninvasive photograph-based method for the evaluation of body condition in free-ranging brown bears (v0.1)" Open
Body condition is an important determinant of health, and its evaluation has practical applications for the conservation and management of mammals.We developed a noninvasive method that uses photographs to assess the body condition of free…
View article: PMab-241 Specifically Detects Bear Podoplanin of Lymphatic Endothelial Cells in the Lung of Brown Bear
PMab-241 Specifically Detects Bear Podoplanin of Lymphatic Endothelial Cells in the Lung of Brown Bear Open
Podoplanin (PDPN)/T1alpha is utilized as a specific marker of lymphatic endothelial cells or type I alveolar cells of lung. Therefore, sensitive and specific monoclonal antibodies (mAbs) detecting PDPN are necessary for immunohistochemical…
View article: <i>Dibothriocephalus nihonkaiensis</i> infection with <i>Ursus arctos</i> in Shari, Hokkaido, Japan
<i>Dibothriocephalus nihonkaiensis</i> infection with <i>Ursus arctos</i> in Shari, Hokkaido, Japan Open
2015年9月北海道斜里町で捕獲されたエゾヒグマを剖検したところ小腸より大型の条虫を検出した。頭節の形態および生殖器の配置から，Dibothriocephalus属と思われた。虫体の一部からDNAを抽出し，核28S ribosomal RNA geneおよびミトコンドリアcytochrome c oxidase geneの一部を解析した。その結果，DNAデータベース上の日本海裂頭条虫のものとほぼ一致し，本種を日本海裂頭条虫と同定した。本症例は，エゾヒグマから検出された条虫を…
View article: Sex-biased dispersal and inbreeding avoidance in Hokkaido brown bears
Sex-biased dispersal and inbreeding avoidance in Hokkaido brown bears Open
Natal dispersal likely plays an important role in avoiding inbreeding among large carnivores. We tested the hypothesis that male-biased dispersal reduces close inbreeding by limiting the spatial overlap of opposite-sex pairs of close relat…
View article: Reproductive parameters and cub survival of brown bears in the Rusha area of the Shiretoko Peninsula, Hokkaido, Japan
Reproductive parameters and cub survival of brown bears in the Rusha area of the Shiretoko Peninsula, Hokkaido, Japan Open
Knowing the reproductive characteristics of a species is essential for the appropriate conservation and management of wildlife. In this study, we investigated the demographic parameters, including age of primiparity, litter size, inter-bir…
View article: Serologic evidence of <i>Brucella</i> infection in pinnipeds along the coast of Hokkaido, the northernmost main island of Japan
Serologic evidence of <i>Brucella</i> infection in pinnipeds along the coast of Hokkaido, the northernmost main island of Japan Open
Brucella infection in Hokkaido was serologically surveyed in four species of pinnipeds inhabiting Cape Erimo during 2008–2013 and the Shiretoko Peninsula in 1999 by ELISA using Brucella abortus and B. canis as antigens. Anti‐ Brucella posi…