Publications
From nature visits to conservation awareness: A visitor survey report at Shiretoko National Park, Japan
A survey of 100 international visitors to Shiretoko National Park, Japan, revealed that while the park's natural beauty and wildlife encounters significantly enhanced conservation awareness for some, exposure to broader conservation challenges and local success stories remained limited. Visitors highly valued well-maintained trails and infrastructure but suggested improvements in multilingual information, marine and terrestrial conservation messaging, and socio-cultural context integration. The study highlights Shiretoko’s potential as a platform for deeper visitor engagement with conservation issues, though brief visits or pre-existing habits often mitigated impact.
Genetic introgression among charr species in the Shiretoko Peninsula, Japan
Researchers have uncovered significant genetic introgression among charr species within the UNESCO World Heritage Site of Shiretoko Peninsula, Japan. Using environmental DNA (eDNA) metabarcoding, they found that up to 97.2% of non-Southern Asian Dolly Varden (SADV) mitochondrial DNA in 40 rivers could be attributed to introgression from White-spotted charr, despite the latter's absence in these regions. The study also identified a minor but notable proportion (up to 0.47%) of eDNA linked to Salvelinus malma, a species not native to Japan, suggesting an additional independent introgression event. These findings highlight the potential for eDNA metabarcoding to detect hidden evolutionary legacies in freshwater fish populations, particularly where conventional surveys are impractical. The research underscores the importance of cautious interpretation of mtDNA-based analyses in systems with frequent genetic exchange and provides valuable insights for conservation genetics.
Rising summer temperatures undermine threatened charr populations in the Shiretoko Peninsula
A 2°C rise in mean summer temperatures or a 20% increase in time spent above 16°C could lead to population declines exceeding 40% in the threatened Southern Asian Dolly Varden (SADV) charr, according to research conducted in the Shiretoko Peninsula, a UNESCO World Natural Heritage site. The study integrated fish density, biomass, and environmental DNA (eDNA) concentration across multiple streams with water temperature records, revealing significant thermal stress impacts on SADV populations. Streams with artificial barriers exhibited higher summer temperatures and prolonged exposure to critical thresholds, further exacerbating population vulnerability. These findings underscore the urgent need for thermal vulnerability assessment in river management and conservation planning under future climate scenarios.
Patterns of intestinal parasite prevalence in brown bears (Ursus arctos) revealed by a 3-year survey on the Shiretoko peninsula, Hokkaido, Japan
A three-year survey on the Shiretoko Peninsula, Hokkaido, Japan, revealed that intestinal parasite prevalence in brown bears (Ursus arctos) is influenced by seasonal and host factors. Key findings include higher detection rates of Dibothriocephalus nihonkaiensis in autumn, while Baylisascaris transfuga and Uncinaria sp. showed seasonal variations linked to bear age class and dietary changes. Egg shedding for these parasites often ceased before or during hibernation, suggesting complex interactions between environmental conditions and host biology. The study analyzed 334 fecal samples using centrifugal flotation techniques and fecal DNA analysis, providing insights into parasite dynamics in wild brown bears.
Permafrost occurrence at Mt. Sashirui, Shiretoko mountain range, eastern Hokkaido, Japan
Researchers have confirmed the first occurrence of permafrost in the Shiretoko mountain range, specifically at Mt. Sashirui in eastern Hokkaido, Japan. Through 5.5-meter borehole temperature measurements near the summit, a wind-swept site covered by alpine dwarf shrubs, the study identified conditions close to the threshold for permafrost formation. The persistence of permafrost here is attributed to thermal insulation provided by bryophyte and lichen cover during summer and efficient heat transfer through frozen shrub branches and thin snow layers in cold spells. This discovery highlights the vulnerability of mountain permafrost to climate change, emphasizing the need for continuous long-term monitoring to track shifts in ground temperatures in this UNESCO World Heritage Site.
Sustainable Financing for Marine Protected Areas (MPAs): A Case Study of the Shiretoko Natural World Heritage Site
Shiretoko's marine protected area (MPA), part of Japan's Natural World Heritage Site, demonstrates how innovative financing can sustain biodiversity conservation efforts. The study highlights the financial mechanisms that have enabled effective protection and management, offering valuable lessons for other MPAs globally. By analyzing Shiretoko's approach, researchers identify key strategies that balance economic sustainability with ecological preservation, aligning with the goals of the Kunming-Montreal Global Biodiversity Framework (GBF). This case study provides actionable insights for conservation finance, emphasizing the potential of community-based and innovative funding models to support long-term marine protection.
Development Model of Japanese National Parks: A Stakeholder Approach with Shiretoko and Fuji Hakone Izu Examples
A governance framework for Japan's national parks, rooted in stakeholder theory, offers a balanced approach to sustainable development. This model, developed through case studies of Shiretoko and Fuji Hakone Izu National Parks, identifies key stakeholders—power, economic, regulatory, and social—and delineates their roles and influence. It emphasizes stakeholder participation to ensure multifunctionality, harmonizing economic goals with environmental conservation. This framework not only provides a theoretical foundation for managing Japan's protected areas but also serves as a global reference for governance in UNESCO World Heritage Sites.
Invasion status of hatchery‐origin pink salmon in an unstocked river at the Shiretoko World Natural Heritage Site in northern Japan
Research at the Shiretoko World Natural Heritage Site reveals significant invasion of hatchery-origin pink salmon (Oncorhynchus gorbuscha) into unstocked rivers, with strays comprising 40.0% and 19.0% of samples in 2021 and 2022, respectively. This finding underscores the potential genetic impact on wild populations, as hatchery fish and their hybrids exhibit lower reproductive success than wild counterparts. The study highlights the need for caution regarding straying rates, particularly for species like pink salmon with higher propensity to disperse beyond stocked areas. Investigators analyzed samples to quantify hatchery-origin fish, providing critical data for conservation efforts in pristine environments.
Marine macroinvertebrate fauna of the shallow coastal waters of the Shiretoko Peninsula, a World Natural Heritage at Hokkaido, Japan
A comprehensive study of the Shiretoko Peninsula identifies 299 marine macroinvertebrate species across 11 phyla, including two species newly recorded in Japan. Conducted from 2006 to 2019, this research highlights significant biogeographical differences between the Sea of Okhotsk and Nemuro Strait sides of the peninsula, likely influenced by ocean currents, coastal topography, and drift ice. The findings underscore the peninsula's role as a boundary between distinct marine biogeographic provinces, with its unique environmental factors shaping its biodiversity. This study emphasizes the importance of monitoring marine biota around Shiretoko, as these species serve as vital bioindicators for environmental changes.
Microplastics in sea ice drifted to the Shiretoko Peninsula, the southern end of the Sea of Okhotsk
Researchers have uncovered significant insights into the presence and distribution of microplastics (MPs) within sea ice, highlighting its role as both a temporary sink and carrier for these pollutants. The study analyzed four sea-ice cores from the Shiretoko Peninsula, revealing nine types of MPs, predominantly fragmentary in shape and smaller than 120 μm, with fiber MPs exceeding 210 μm. MP concentrations ranged from 0 to 60 particles per liter, averaging 21 particles/L, with higher occurrences noted in lower ice layers, suggesting potential sources or redistribution within the ice matrix. Notably, no correlation was found between MP and sediment abundances, indicating distinct suspension freezing kinetics for these substances. These findings provide critical evidence for understanding the dynamics of microplastics in sea ice ecosystems.
Visitors’ Attitudes Toward the Expansion of Alternative Shuttle Bus System in Shiretoko National Park
A majority of visitors to Shiretoko National Park, a UNESCO World Natural Heritage site renowned for its brown bear habitat, support the expansion of shuttle bus services as an alternative to private vehicles. A questionnaire survey revealed that features such as guided tours and optional experiences significantly encouraged visitors to switch to shuttle buses, despite low awareness of the pilot program. However, some visitors still preferred their cars, highlighting the need for improved promotion. The study used a choice experiment to assess visitor preferences, offering insights into balancing visitor convenience with conservation goals in protected areas.
Analysis Weather and Current Condition about Shiretoko Maritime Accident 2022
In April 2022, a maritime accident off Shiretoko Peninsula resulted in the sinking of a sightseeing boat with all crew members missing. The study reveals that post-accident weather conditions—marked by rapid changes in wind direction and increased wave height due to a cold front passage—significantly hindered search efforts. Using virtual dye dispersion modeling, researchers predicted drift patterns, explaining why survivors were initially found near Shiretoko but later discovered around Kunsasan and Sakhalin. The analysis attributes these shifts to changing sea surface currents influenced by high-pressure systems, which caused east-west oscillations before dispersing debris northwestward.
Impact of Multiple Water Temperature Structures on the Behavioral Pattern of Chum Salmon (Oncorhynchus keta) on the Coast of the Shiretoko Peninsula
Chum salmon (Oncorhynchus keta) migrating to the Shiretoko Peninsula, Japan, exhibit distinct behavioral adaptations to complex water temperature structures formed by coastal currents. The study found that these fish actively avoid thermoclines—zones of rapid temperature decline—and instead prefer swimming in stable surface or deep layers (210–230 m). This preference suggests a sophisticated response to vertical temperature gradients, offering new insights into the behavioral ecology of homing salmon. Researchers used continuous tracking and vertical profiling data collected in 2012 and 2013 to document these patterns. The findings highlight the importance of understanding environmental factors in developing sustainable management strategies for salmon populations.
Tourism and sustainability at a crossroads in Shiretoko UNESCO World Natural Heritage Site in Japan
Shiretoko Peninsula, a UNESCO World Natural Heritage Site in Japan, faces significant sustainability challenges due to increasing tourism pressures. The study identifies critical issues such as low stakeholder awareness of environmental changes, fragmentation of ecosystems, and the emergence of wildlife ocular consumption as novel stressors. It also highlights gaps in science communication among guides, inadequate legal protection for endangered species, and a lack of multilingual skills, which exacerbate the site's vulnerabilities. The research, based on visitor surveys, stakeholder interviews, and participant observation, underscores the need for a holistic approach to heritage management that fosters open dialogue between ecological experts, managers, locals, and tourists to address these complex challenges effectively.
Diel and monthly activity pattern of brown bears and sika deer in the Shiretoko Peninsula, Hokkaido, Japan
Brown bears and sika deer on Japan's Shiretoko Peninsula exhibit distinct diel activity patterns influenced by seasonal behaviors, reproductive motivations, and environmental factors. Unlike European brown bears, those in Shiretoko show a diurnal/crepuscular pattern, with increased activity during autumnal hyperphagia, particularly among adult females and sub-adults. Protected areas further enhance diurnality, suggesting human activities and competitive interactions play significant roles. Sika deer, meanwhile, maintain a crepuscular pattern with minimal variation across months or sex-age classes, though male activity peaks during the autumn copulation period. The study employed camera-trap surveys over five months in 2019, capturing 7,530 observations to analyze these patterns, offering critical insights for wildlife conservation and management.
Estimation of breeding population size using DNA‐based pedigree reconstruction in brown bears
A high-density brown bear population on the Shiretoko Peninsula, Japan, was found to have between 128 and 173 breeding females and 66 and 91 breeding males, with a minimum total population size of 449 individuals in 2019. This estimate was derived using DNA-based pedigree reconstruction, which relied on long-term genetic sampling (1998–2020) followed by intensive noninvasive surveys (2019–2020). Researchers successfully assigned parentage for 330 bears and partial parentage for an additional 123 individuals using microsatellite markers. The study demonstrates that combining extensive historical data with short-term intensive sampling can yield reliable demographic estimates for elusive species, providing critical insights for conservation efforts.
Identifying effective tree planting schemes to restore forest carbon and biodiversity in Shiretoko National Park, Japan
Tree planting in Shiretoko National Park, Japan, can effectively restore both forest carbon and biodiversity when done with high density (2,500+ trees/ha) and species richness (>4 species), regardless of distance from natural seed sources. Simulation modeling revealed that such planting scenarios achieve over 50% of the restoration success of intact forests within 33 years for both goals. Conversely, low-species planting or reliance on distant natural regeneration significantly delays biodiversity recovery.
Valuation of latent demand for ecotourism in Shiretoko using choice-based experiments
A significant gender and age disparity exists in the latent demand for ecotourism in Shiretoko, with over 60% of potential visitors being men aged 40 or older. This finding underscores a critical challenge for sustainable ecotourism development in the region, as attracting female and younger tourists is essential for long-term viability. The study employed choice-based experiments via web surveys to identify two distinct preference segments among respondents, with key differences driven by travel experience, age, and gender. These insights highlight the need for targeted strategies to broaden the appeal of Shiretoko's ecotourism offerings.
Dining from the coast to the summit: Salmon and pine nuts determine the summer body condition of female brown bears on the Shiretoko Peninsula
Female brown bears on the Shiretoko Peninsula experience seasonal fluctuations in body condition, primarily driven by their access to high-lipid pine nuts and high-protein salmon. A six-year study (2012–2018) found that while body condition declined until late August, it began to recover in September when salmon consumption peaked. Years with higher intake of both pine nuts and salmon saw earlier recovery in body condition. Additionally, females with offspring had poorer body condition than solitary ones, especially during low-salmon years. The research used scat analysis (2,079 samples) and photographic measurements (1,226 images from 12 bears) to quantify diet and body condition, revealing the critical role of these unique coastal and subalpine foods in bear survival and reproduction.
Marine Comanagement Plan of Shiretoko World Heritage site
Shiretoko, inscribed as a UNESCO World Heritage Site in 2005, exemplifies a unique case where the protection of its terrestrial and marine ecosystems was driven not by government mandates but by local stakeholder initiatives. The site's outstanding universal value lies in its connection between land and sea, yet it faces challenges from coastal fisheries. This study highlights the pivotal role of comanagement by fisheries cooperative associations (FCA) in strengthening ecological risk management. Unlike traditional World Heritage Sites protected by national laws, Shiretoko's conservation success hinges on local decision-making and stakeholder collaboration. The research emphasizes the importance of such collaborative approaches in safeguarding biodiversity and marine ecosystems without relying on international oversight.
Reforestation provides a foraging habitat for brown bears (Ursus arctos) by increasing cicada Lyristes bihamatus density in the Shiretoko World Heritage site
Reforestation efforts in the Shiretoko World Heritage site, northern Japan, have been found to create a foraging habitat for brown bears by significantly increasing the density of cicada nymphs. The study observed that brown bears were exclusively digging for Lyristes bihamatus nymphs in restored conifer forests, not in natural forests, suggesting that reforestation enhances the availability of this food source. This discovery highlights the ecological benefits of reforestation, particularly in areas where brown bear populations are dense.
Seasonal and diel changes in cetacean vocalizations monitored by passive acoustic methods in Nemuro Strait adjacent to the Shiretoko World Natural Heritage Site
Research reveals that cetaceans in Nemuro Strait, adjacent to the Shiretoko World Natural Heritage Site, exhibit distinct seasonal and diel patterns in their vocalizations. Killer whale calls were prominent in spring and summer, while sperm whale clicks dominated during summer months. Pacific white-sided dolphin calls were recorded in both summer and late fall, with notable nighttime activity. No cetacean vocalizations were detected during the sea ice period from February to March. The study employed passive acoustic recording devices over a 21-month span (November 2012–March 2014) to monitor these patterns, providing new insights into marine mammal habitat use and diversity in this ecologically significant region.
A Qualitative Exploratory Analysis of Ecological Integrity for Safeguarding World Natural Heritage Sites: Case Study of Shiretoko Peninsula, Japan
Despite their protected status, many UNESCO World Natural Heritage Sites (WNHS) face severe anthropogenic stress. A qualitative study of the Shiretoko Peninsula, Japan, reveals that its ecosystems have not fully recovered from 20th-century disruptions and now confront new threats, such as tourism development and infrastructure expansion. The research, which synthesizes scientific literature with monitoring data on Blakiston’s Fish Owl—a keystone species—highlights the urgent need for restoring lower trophic levels, streams, and forests while curbing road and facility construction. These findings underscore the necessity for WNHS managers to implement measures that offset anthropogenic stress on ecological integrity (EI) and integrate site management with surrounding landscapes to preserve fine-scale heterogeneity.
Incidence of Multiple Paternity and Inbreeding in High-Density Brown Bear Populations on the Shiretoko Peninsula, Hokkaido, Japan
A study on the Shiretoko Peninsula, Japan, reveals that approximately 15% of brown bear litters result from multiple paternity, comparable to rates observed in Scandinavian populations despite differences in population density and litter size. The research also identified low but notable instances of inbreeding, including cases involving father-daughter matings (2.7%), maternal half-siblings (0.5%), and paternal half-siblings (1.8%). No evidence was found for mother-son or full-sibling matings. These findings suggest that male-biased dispersal plays a crucial role in limiting close inbreeding, offering insights into the genetic dynamics of high-density brown bear populations. The study genotyped 837 individuals at 21 microsatellite loci and analyzed parentage across 70-82 litters to derive these conclusions.
Male reproductive input, breeding tenure, and turnover in high-density brown bear (Ursus arctos yesoensis) populations on the Shiretoko Peninsula, Hokkaido, Japan
A high-density brown bear population on Japan's Shiretoko Peninsula shows relatively even male reproductive input, with 19 males siring 82 offspring from 54 litters over a decade. Paternity analysis using microsatellite DNA revealed that while some years favored certain individuals, breeding tenure typically lasted 1 to 6 years. Human-caused mortality in peripheral areas disrupted this balance, highlighting the impact of human activity even within protected zones. Male reproductive success peaked at ages 10–14, aligning with physical maturity. These insights advance understanding of solitary mammal breeding systems and inform conservation strategies for vulnerable populations.
On the Ocean age of Masu Salmon Oncorhynchus masou in a Natural Population, Shiretoko Peninsula, Japan
A study on masu salmon (Oncorhynchus masou) in the Orumappu River, Shiretoko Peninsula, Japan, challenges conventional age assessment methods. Researchers tagged 667 wild smolts and recaptured 11 adults, all of which spent one winter at sea but showed inconsistencies in scale annuli—four lacked clear winter rings, while one exhibited two or three closely spaced resting zones. This suggests that relying solely on scale analysis may underestimate the ocean age of adult masu salmon, complicating population studies and conservation efforts.
Reproductive parameters and cub survival of brown bears in the Rusha area of the Shiretoko Peninsula, Hokkaido, Japan
Brown bears (Ursus arctos yesoensis) in the Rusha area of Shiretoko, Hokkaido, Japan, exhibit among the highest reproductive rates globally, with females producing 0.70 to 0.76 young per year. A long-term study (2006–2016) tracking 15 philopatric females revealed key parameters: mean age of first reproduction at 5.3 years, litter sizes averaging 1.76 cubs, and inter-birth intervals of 2.43 to 2.53 years. Cub survival rates (60–73%) peaked in mortality during summer (July–August), likely due to nutritional stress. These findings align with global trends but highlight Shiretoko's unique demographic dynamics, offering critical insights for conservation strategies.
The path to sustainable fisheries in Japan and the transformative impact of the Shiretoko World Natural Heritage Site
The Shiretoko World Natural Heritage Site (WNHS) stands out as a model of community-driven conservation, particularly through its sustainable fisheries initiatives. The study highlights how local actors, especially fishers, have played a pivotal role in transforming social and ecological conditions, leading to successful conservation outcomes. A key strategy involves organized beach cleaning efforts, which not only mitigate pollution but also foster a sense of stewardship among the community. This 'Shiretoko Approach' emphasizes balancing environmental protection with livelihood sustainability, resulting in improved living standards. The research employs a social-ecological systems lens to analyze the strengths and weaknesses of this approach, offering insights into its replicability for other heritage sites.
Deer herbivory affects the functional diversity of forest floor plants via changes in competition‐mediated assembly rules
Deer herbivory significantly impacts the functional diversity of forest floor plants by altering competition-mediated assembly processes, leading to distinct ecological outcomes depending on grazing intensity. Research in Shiretoko National Park, Japan, revealed that while overgrazing increases species richness and diversity due to stochastic assembly processes, deer exclusion results in competitive dominance by a few superior plant species, reducing biodiversity and promoting biotic homogenization. The study highlights the importance of balancing deer herbivory for maintaining ecological processes and biodiversity, cautioning against complete exclusion through fencing.
Diversity of marine mammal vocalizations off Rausu, Shiretoko, northern Japan
Passive acoustic monitoring off Rausu, Shiretoko, revealed distinct vocalization patterns among marine mammals, providing new insights into their seasonal behaviors. Pacific white-sided dolphins emitted burst pulsed calls in July, November, and December, while ribbon seals produced downsweeps likely linked to breeding activities in February and March. Killer whales exhibited pulsed calls from April to August, and sperm whales generated clicks in July and August, suggesting foraging behavior. This non-invasive method overcame limitations posed by seasonal sea ice and harsh weather, offering a comprehensive understanding of marine mammal ecology in this UNESCO World Heritage Site.
Market segmentation and their potential economic impacts in an ecotourism destination
A study on the Shiretoko Peninsula, Japan, identifies four distinct clusters of ecotourism visitors based on their motivations, information search behaviors, and activities. These clusters vary significantly in their ecological awareness and economic impact, highlighting the need to balance sustainability with economic viability. The research employs a model-based latent class analysis to segment the heterogeneous tourist market, providing actionable insights for management strategies that can maximize benefits for the local economy while preserving ecological integrity.
Functional redundancy of multiple forest taxa along an elevational gradient: predicting the consequences of non‐random species loss
A study in Shiretoko National Park, Japan, reveals that while climate change may alter the taxonomic composition of plant and invertebrate communities along elevational gradients, functional redundancy—where different species perform similar ecological roles—may buffer ecosystem processes. Researchers found that functional turnover was generally lower than taxonomic turnover, suggesting that novel communities emerging due to rising temperatures could maintain critical ecosystem functions. However, non-random species loss from mammalian overgrazing/browsing significantly accelerated functional turnover, potentially eroding this redundancy and threatening ecosystem stability. The findings highlight the synergistic impacts of climate change and other environmental stressors on ecological communities.
Vascular plants from Kunashiri Island, the southernmost island of the Kuril Islands, island arc between Hokkaido and Kamchatka peninsula
Research on Kunashiri Island, part of the Kuril Islands, reveals that its vascular plant diversity remains well-preserved, offering a baseline for comparing floral compositions with Shiretoko World Natural Heritage Site. Conducted as part of a sika deer management program, the study inventoried plants in July 2013 to assess vegetation damage from browsing pressure. The findings suggest Kunashiri's flora serves as a reference for Shiretoko's original composition before deer-induced degradation, providing insights into ecological resilience and conservation challenges in similar environments.
A Quality Assessment of Tourist Information: the Case of Nautical Tourism at Shiretoko Peninsula
A mismatch between visitor expectations and actual experiences at Shiretoko Peninsula significantly impacts satisfaction and loyalty. The study found that information from online sources and guidebooks often leads to dissatisfaction with certain routes and elements, while local information from tourist offices, hotels, and shops is less problematic. Researchers employed a multi-group structural model to analyze the effects of different information sources on booking cruise tours in Shiretoko. This approach highlights the importance of accurate and locally grounded information in enhancing visitor satisfaction and fostering positive recommendations.
A relapsing fever group Borrelia sp. similar to Borrelia lonestari found among wild sika deer (Cervus nippon yesoensis) and Haemaphysalis spp. ticks in Hokkaido, Japan
Researchers have identified a relapsing fever Borrelia species, similar to Borrelia lonestari (B. lonestari-like), in wild sika deer and Haemaphysalis ticks in Hokkaido, Japan. The study found significant regional variation in prevalence, with 17% of deer in Shiretoko testing positive compared to just 2.8% in Shibetsu. Fawns exhibited a higher infection rate (21.9%) than adults (9.4%). Notably, B. lonestari-like was detected in Haemaphysalis ticks for the first time, suggesting these ticks may serve as vectors. The study also conducted the first phylogenetic analysis of this organism in Asia, providing insights into its distribution and potential public health implications.
A Study of Expectation and Satisfaction with Shiretoko Tourism Among Shiretoko Tourists and Travel Trade
Tourists visiting Shiretoko exhibit higher satisfaction with their experience than tourism operators anticipate. Despite modest expectations regarding the site's attractions and services, visitors report greater fulfillment, indicating that their actual experiences surpass initial anticipations. This discrepancy underscores the importance of maintaining Shiretoko's natural value while strategically leveraging user feedback to sustain its appeal for eco-tourism. The study employed a comparative approach, analyzing tourists' perceptions against those assumed by tourism operators to identify gaps and inform conservation and tourism strategies.
Geological characteristics of dip slope type landslides occurred on hard shale dominant formation in the Green Tuff region : an example of the Oshinkoshin landslide area in the Shiretoko Peninsula, East Hokkaido, Japan
A study of the Shiretoko Peninsula, Japan, reveals that large-scale landslides in the Green Tuff region are closely linked to geological layers dominated by hard shale and interbedded soft tuffaceous rocks. These dip-slope type landslides, classified as hydrothermally altered rock slides or debris flows, originate from the presence of smectite-rich soft tuff layers within thick hard shale formations. The research highlights that the Oshinkoshin landslide area exemplifies this relationship, with variations in scale—from massive rock slides to smaller debris flows—depending on the composition and structure of the moving material. This finding underscores the critical role of stratigraphic layering and mineralogical properties in landslide susceptibility within hard shale-dominated terrains.
Projection of Nutrient Discharge by Using MRI-AGCM3.1S in Shiretok
A new study projects future nutrient discharge from the Shiretoko Peninsula, a UNESCO World Natural Heritage Site, using the MRI-AGCM3.1S climate model with two bias correction techniques. The research finds that the cumulative distribution function (cdf) correction technique more accurately reproduces nutrient flux compared to the normal distribution method. This insight is crucial as climate change-altered precipitation patterns threaten the ecological balance of Shiretoko, where nutrient circulation between inland and ocean plays a pivotal role in its unique ecosystem. By focusing on precipitation—a key driver of nutrient supply—the study aims to inform conservation efforts and mitigate potential disruptions to this fragile heritage site.
Sighting of a North Pacific right whale in the southern Okhotsk sea, off Shiretoko, Hokkaido
A North Pacific right whale was sighted near the coast of Shiretoko Peninsula, Hokkaido, on July 5, 2013. This marked the first confirmed observation in the southern Okhotsk Sea since Japan's research capture off Sakhalin Island in 1968. The discovery highlights the potential presence and movement patterns of this critically endangered species in previously understudied regions. Researchers analyzed visual data from the sighting, focusing on the whale's morphology and behavior to confirm its identification. This observation contributes valuable baseline data for understanding the distribution and conservation status of North Pacific right whales, which are threatened by historical whaling and ongoing habitat degradation.
Community assembly processes shape an altitudinal gradient of forest biodiversity
A study at Shiretoko National Park, Japan, reveals that community assembly processes significantly shape altitudinal gradients of forest biodiversity. The research found that deterministic processes dominate in high-altitude, low-productivity stands due to niche partitioning among small individuals within less stratified environments. Conversely, stochasticity influences community structure in structurally developed, low-altitude stands, likely due to competition for light resources. While the altitudinal gradient of β-diversity was less pronounced in oribatid mites compared to plants, local-scale environmental heterogeneity still favored deterministic assembly processes. The study highlights that biogeographical patterns of biodiversity are not independent of community processes and are instead shaped by stochastic and deterministic factors that vary within a landscape.
Heterogeneous Preferences for Winter Nature-Based Tours in Sub-Frigid Climate Zones: A Latent Class Approach
Winter nature-based tours in sub-frigid climate zones, such as Shiretoko, Japan, cater to distinct visitor preferences that can be segmented into three groups. One group prioritizes wildlife observation, particularly rare eagles and detailed interpretation, while another favors adventure-focused drift ice experiences with little interest in eagles or guided explanations. A third segment falls between these extremes. This heterogeneity suggests that tour operators should tailor offerings to specific preferences rather than assuming universal appeal, ensuring both visitor satisfaction and profitability.
Adaptation to climate-change effects on fisheries in the Shiretoko World Natural Heritage area, Japan
Climate change is significantly impacting fisheries in the Shiretoko World Natural Heritage area, Japan, with observed effects including reduced seasonal sea ice and shifts in fishing grounds. The study highlights the need for integrated policy measures and cross-sector coordination to adapt to these changes, emphasizing the importance of large-scale marine ecosystem (LME) research and monitoring. It also suggests that cultural elements, such as those promoted by the World Heritage programme, could contribute to developing a new, peaceful societal framework based on LME principles.
Clarification of Mechanisms of Nutrient Circulation Between Ocean and Inland in Shiretok
Research in Shiretoko reveals that drift ice from the northern Okhotsk Sea plays a significant role in transporting nutrients to the peninsula's inland ecosystems during winter. This nutrient circulation contributes to the region's rich biodiversity and robust ecological system. To quantify this process, scientists employed isotope analysis to estimate the amount of nutrients transported between the ocean and inland areas. While the study confirms the importance of drift ice as a nutrient source, it also highlights the need for further research to precisely measure its impact.
Role of fisheries and ecosystem-based management: Shiretoko, Japan
Shiretoko, Japan's northeastern Hokkaido peninsula and surrounding marine areas, exemplifies successful integration of fisheries management with ecosystem conservation. The 'Shiretoko Approach' demonstrates how local fishing communities, through autonomous measures under a co-management framework, contribute significantly to sustainable fisheries without being excluded post-World Heritage inscription. This approach expanded fisheries co-management into ecosystem-based management (EBM), ensuring the preservation of Shiretoko's unique terrestrial and marine ecosystems, including endangered species. The region's rich biodiversity stems from complex oceanographic currents, including cold and warm water interactions that support seasonal sea ice. By placing local practices at the core of conservation efforts, this model offers a blueprint for balancing human activities with ecological sustainability in protected areas.
Comparative study of preferences for eco-tours in Shiretoko between general public and visitors
A comparative study of eco-tour preferences in Shiretoko, Japanreveals distinct preferences between potential new visitors and repeaters. New visitors favor renowned destinations like Kamuiwakka, while repeaters prefer primitive settings such as Lake Rausu. Additionally, repeaters prioritize detailed guide explanations and smaller group sizes over other tour features. The study used choice experiments to analyze these preferences, providing insights for balancing nature conservation with local economic benefits through targeted eco-tour offerings.
Evaluation of nutrient flux from Shiretoko into the ocean using MRI-GCM
Researchers found that rainfall intensity, particularly its standard deviation, significantly controls nutrient flux from Shiretoko's inland areas to the coast. This discovery highlights a key factor influencing coastal ecological systems. To estimate future nutrient supply, the study used bias-corrected data from the Meteorological Research Institute Global Climate Model (MRI-GCM), which aligns well with observed rainfall data. A synthetic generation technique produced hourly rainfall data, crucial for assessing nutrient dynamics in Shiretoko's river basins. The findings suggest that nonlinearity in rainfall intensity strengthens its impact on nutrient flux, providing critical insights for understanding coastal nutrient cycles.
A Study on Visitors' Cognition and Expectation to Provided Information, and Factors Affecting their Attitude in Shiretoko National Park
A significant portion of visitors to Shiretoko National Park, around 30%, only became aware of enforced traffic controls upon arrival, highlighting gaps in pre-visit information dissemination. The study reveals that visitors often lack understanding of critical safety and environmental risk management information, particularly regarding visitor behavior for environmental conservation. Key expectations for both prior and on-site information focused on weather forecasts, brown bear encounters, and traffic control—factors that significantly influence visitor activity and destination choices. Visitors' prior experience in Shiretoko, transportation type, and dwelling location influenced their access to information and cognitive levels. Prior experience also shaped their expectations regarding the content of provided information. The research underscores the need for a well-designed, stage-specific system to deliver environment-friendly information effectively, from planning to arrival.
Estimating the spawning escapement of pink salmon Oncorhynchus gorbuscha using the area-under-the-curve method in the Rusha River of the Shiretoko Peninsula, Hokkaido Island
Researchers estimated the spawning escapement of pink salmon (Oncorhynchus gorbuscha) in the Rusha River, Shiretoko Peninsula, using the area-under-the-curve (AUC) method combined with visual counts. The study found that while the estimated escapement was reasonable, the actual number of spawning grounds was significantly lower than expected based on escapement numbers and available spawning areas. This highlights a potential mismatch between salmon population dynamics and habitat utilization in this UNESCO World Heritage Site. The AUC method proved effective for assessing spawning escapement, providing valuable insights into the ecological role of pink salmon in transporting marine-derived nutrients to terrestrial ecosystems.
Non-Invasive Genetic Identification of the Red FoxVulpes vulpesin the Shiretoko National Park, Eastern Hokkaido, Japan
A groundbreaking study in Shiretoko National Park, Japan, demonstrates that non-invasive genetic analysis of red fox (Vulpes vulpes) feces can effectively estimate population numbers with high accuracy. Using microsatellite analysis on 59 fecal samples, researchers identified a minimum of 22 individual foxes, with a cumulative probability of sibling misidentification (P(ID)sibs) below 0.01. The study highlights the potential of fecal genetic sampling for wildlife monitoring but also underscores challenges such as low genotyping success rates (23.3–69.8%) and reproducibility (53.5–88.4%). To improve efficiency, the research suggests selecting marker sets with smaller allele sizes, which significantly enhances both success rates and reproducibility. This approach offers a valuable tool for conservation efforts in remote or inaccessible areas like Shiretoko.
Population Structure ofAegialitesBeetles (Coleoptera, Salpingidae) on the Coasts of Hokkaido, Northern Japan
A molecular phylogeographic analysis of flightless Aegialites beetles from Hokkaido's coasts revealed two distinct genetic lineages with divergent population structures and histories. Lineage A, found on the Sea of Japan and Okhotsk coasts, showed rapid population expansion, while lineage B, predominantly on the Pacific coast and Shiretoko Peninsula, exhibited higher genetic divergence among populations. Despite their unidimensional habitat, no correlation was observed between genetic differentiation and geographic distance in either group. The study suggests allopatric divergence of these lineages during the Pliocene, providing insights into their evolutionary trajectories.
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