A5103160778- Wildlife Ecology and Conservation
- Animal Ecology and Behavior Studies
- Ecology and Vegetation Dynamics Studies
- Animal Behavior and Welfare Studies
- Identification and Quantification in Food
- Bat Biology and Ecology Studies
- Species Distribution and Climate Change
- Genetic diversity and population structure
- Human-Animal Interaction Studies
- Primate Behavior and Ecology
- Genomics and Phylogenetic Studies
- Avian ecology and behavior
- Plant and animal studies
- Animal Behavior and Reproduction
- Ecology and biodiversity studies
- Probiotics and Fermented Foods
- Yersinia bacterium, plague, ectoparasites research
- Rangeland and Wildlife Management
- Isotope Analysis in Ecology
- Forest Ecology and Biodiversity Studies
- Heart Rate Variability and Autonomic Control
- Video Surveillance and Tracking Methods
- Polyamine Metabolism and Applications
- Meat and Animal Product Quality
- Wildlife-Road Interactions and Conservation
Hokkaido University
1997-2024
Tokyo University of Agriculture
2015-2024
Ibaraki Nature Museum
2011-2023
Tokyo University of Agriculture and Technology
2010-2020
Abstract Accurately quantifying species’ area requirements is a prerequisite for effective area‐based conservation. This typically involves collecting tracking data on species of interest and then conducting home‐range analyses. Problematically, autocorrelation in can result space needs being severely underestimated. Based the previous work, we hypothesized magnitude underestimation varies with body mass, relationship that could have serious conservation implications. To evaluate this...
Large carnivores have long fascinated human societies and profound influences on ecosystems. However, their conservation represents one of the greatest challenges our time, particularly where attacks humans occur. Where recreational and/or livelihood activities overlap with large carnivore ranges, conflicts can become serious. Two different scenarios are responsible for such overlap: In some regions world, increasing populations lead to extended encroachment into which subject contraction,...
Facultatively psychrophilic alkaliphilic strains were isolated from seawater obtained off the coast of Rumoi, Hokkaido, Japan. They Gram-negative, aerobic straight rods with polar flagella. The isolates catalase- and oxidase-positive able to grow at 4 degrees C, but not 40 C. produced acid D-glucose under conditions. reduced nitrate nitrite hydrolysed casein gelatin, starch or DNA. NaCl was required for growth pH 10 neutral pH. major isoprenoid quinone ubiquinone-9 (Q-9) DNA G+C content...
We estimated the seed shadow created by Asiatic black bear Ursus thibetanus in order to evaluate bears effectiveness as a disperser. combined data from movements, determined GPS telemetry, with gut retention time (GRT). plant shadows two ways: direct movement give actual (ASS), and cumulative potential (PSS). The purpose of this study was answer following questions: (1) does GRT differ between seasons or size contents? (2) Does vary among sex, seasons, estimation method (ASS PSS), years? (3)...
Abstract Although bears may expand their home ranges in times of low food availability, it is unclear what mechanisms directly affect range extension mast production Japanese forests. To clarify the relationship between utilization by black ( Ursus thibetanus ) and abundance distribution production, we collected data on habitat use from 13 (6 M 7 F) fitted with Global Positioning System (GPS) collars equipped activity sensors Ashio‐Nikko Mountains eastern part Honshu Island, Japan, during...
Abstract Animal tracking data are being collected more frequently, in greater detail, and on smaller taxa than ever before. These hold the promise to increase relevance of animal movement for understanding ecological processes, but this potential will only be fully realized if their accompanying location error is properly addressed. Historically, coarsely-sampled have proved invaluable large scale processes (e.g., home range, habitat selection, etc.), modern fine-scale unlock far...
Five members of the order Carnivora in cool-temperate deciduous forests Japan consume fruits trees, and they are potential dispersers seeds fleshy-fruited plants. We studied frugivory Asiatic black bear, Japanese marten, badger, red fox, raccoon dog forest central Japan. From May 2003 to April 2005, a total 377 fecal samples five carnivores (bears, 91; martens, 158; badgers, 45; foxes, 36; dogs, 47) were sampled determine presence frequency occurrence seeds. Seeds from 17 plant species,...
We documented the fluctuation of daily time budgets in Japanese black bears (Ursus thibetanus japonicus) throughout year using continuous day-to-day data from activity sensors integrated into global positioning system collars, during 2003–2009. evaluated influence availability food resources on active conjunction with differences sex and reproductive status females (with or without offspring). The fluctuated nonlinearly year. There were 3 turning points at which level clearly changed...
Ants are an important food resource for most of bear species. During the summer, Japanese black bears (Ursus thibetanus japonicus) use grasslands in ∼60 km2 Ashio area as ant feeding site. We studied levels myrmecophagy using GPS locations and activity sensor information along with direct observations 2 during 2004 2005. measured species composition, biomass, nutrient contents ants estimated through scat analysis. Both number biomass were higher than adjacent forest areas. recorded 15...
We studied the relationships between movement and foraging habits of Asiatic black bear (Ursus thibetanus) hard mast production five tree species in cool temperate forest during 2006–2008. The purpose this study was to test hypothesis that low affects sexual differences behavior. summarized pattern 13 bears terms minimum distance cumulative path followed 24 hour. Masting Quercus crispula acorns 2006, high 2007 moderate 2008. dominant food items found scats were mast, especially acorns....
The present study aimed to investigate the nutritional aspects of bear diet quantitatively, in order understand plant food selection spring. Bears were observed directly from April July 2013 and 2014, visually recognize species consumed by bears, describe foraging period Ashio-Nikko Mountains, central Japan. Leaves collected eight dominant tree species, regardless whether bears fed on them spring, their key components analyzed: crude protein (CP), neutral detergent fiber (NDF), total energy....
To describe the maintenance process of matrilineal site fidelity in large, solitary mammals, we investigated both over time and effect kinship on space use at a fine (home range) scale under different levels food availability. We collected location data for female Asian black bears, Ursus thibetanus, using GPS collars identified microsatellite DNA markers from bears Ashio-Nikko Mountains, Japan. autumn resources by assessing hard mast productivity. found high years denning to summer season,...
Abstract A comparative analysis of animal behavior (e.g., male vs. female groups) has been widely used to elucidate specific one group since pre-Darwinian times. However, big data generated by new sensing technologies, e.g., GPS, makes it difficult for them contrast differences manually. This study introduces DeepHL, a deep learning-assisted platform the movement data, i.e., trajectories. software uses neural network based on an attention mechanism automatically detect segments in...
The Japanese black bear (Ursus thibetanus japonicus) is a forest-dwelling species and can be very difficult to observe directly in most of its habitats. Therefore, as research tool evaluate activity patterns time budgets, we fitted GPS radiocollars with sensors on 4 bears, 2 males females, during 2003–06 the Ashio Mountains, which have open Through comparison observations from video camera sensor values, categorized activities either resting (inactive) or feeding short distance movements...
Very little is known about the cementum annuli of Asian black bears (Ursus thibetanus). We collected first premolar tooth from adult female in central Japan to investigate whether reproductive history was reflected width; previous studies have indicated that this possible other bear species. calculated proportional width index (PWI) value as an annular growth, and we confirmed status by direct field observations (females with cubs, yearlings, or without offspring). compared both PWI among 10...
Abstract Arboreal feeding signs are among several field indicators of the use tree crowns by Asiatic black bear ( Ursus thibetanus ) to sit and eat fruit; however, it is unclear which factors influence this sign formation in hard mast species. Here, we investigated seed production individual trees at a regional scale major species on detection arboreal signs. For 7 years, quantitatively assessed 374–481 each year three dominant Quercus crispula , serrata Castanea crenata Ashio‐Nikko...
Abstract Scavenging is a common feeding behavior by many species that plays an important role in ecosystem stability and function while also providing services. Despite its importance, facultative scavenging on large animal carcasses has generally been overlooked Asian temperate forest ecosystems. The aim of this study was to determine the composition scavenger guild as it relates sika deer ( Cervus nippon ) Japanese forests. There are no obligate scavengers or predators kill adult...
Abstract Habitat selection is assumed to accrue fitness benefits. Where resource availability variable, individuals should respond by changing habitat increase availability. However, direct links between observed changes in and energetic benefits of this behavior are rarely detected. We used a novel method whereby we converted interannual production levels three hard-mast-producing Fagaceae species into comparative productivity score investigate potential Asiatic black bear selection....
Abstract Vertical seed dispersal, i.e. dispersal towards a higher or lower altitude, is considered critical process for plant escape from climate change. However, studies exploring vertical are scarce, and thus, its direction, frequency, mechanisms little known. In the temperate zone, evaluating of animal-dispersed plants fruiting in autumn and/or winter essential considering dominance such forests. We hypothesized that their seeds dispersed altitudes because downhill movement frugivorous...
Lions (Panthera leo) are a principal attraction for both safari hunting and photographic tourism, sources of revenue in the Luangwa Valley eastern Zambia. I studied 6 lion prides during 1989-91 to determine how high harvest adult male lions influenced social behavior. Adult subject significant pressure influencing number (ad M/ad F = 0.17-0.33) coalition size (0.67-1.50 ad M/pride). observed following system: (1) ranges pride males did not cover entire were confined specific range; (2)...