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.
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.
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.
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.
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.
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