Publications
More Than Just A Building: Regenerating the Chateau Tongariro.
Adaptive reuse offers a viable strategy for revitalizing heritage buildings, such as the Chateau Tongariro, to address economic, cultural, and social challenges while preserving their historical significance. This study demonstrates that by integrating contemporary functions—such as accommodation, wellness facilities, and community spaces—with cultural considerations, at-risk landmarks can be transformed into resilient, multi-purpose hubs. The research proposes a design framework prioritizing heritage, cultural visibility, and decolonization, which could serve as a model for heritage-led regeneration in Aotearoa New Zealand. By balancing historical preservation with modern needs, the Chateau Tongariro's adaptive transformation showcases potential to strengthen regional tourism, reinforce community identity, and sustain the cultural values of Tongariro National Park.
Raoulia albosericea as a Facilitator in Tongariro National Park, North Island, New Zealand: Revised Version
Cushion plants like Raoulia albosericea can significantly facilitate the growth and survival of other plant species by mitigating harsh environmental conditions, but this phenomenon has been largely unexplored outside Northern Hemisphere contexts. A study in Tongariro National Park, New Zealand, found that R. albosericea lowered soil temperature and increased compaction under its canopy, leading to higher overall plant density and cover within its canopies compared to open areas. These effects were more pronounced at high elevations. Ten of the 14 species surveyed showed a significant spatial association with R. albosericea, suggesting it plays a key role in facilitating plant diversity in this unique alpine environment. The research provides new insights into how cushion plants influence biodiversity patterns under varying abiotic conditions.
Alpine Plant Communities and Ecosystem Services Under Drivers of Global Ecosystem Change
Alpine plant communities in Tongariro National Park, New Zealand, exhibit species-specific responses to climate warming and dominant species removal, with native plants showing shifts toward more acquisitive growth strategies. Research using 18 functional traits—including leaf morphology, tissue chemistry, biomass, and height—revealed that high-alpine species like Poa cita and Rytidosperma setifolium benefited from warming, while invasive species showed little response. Principal component analysis suggested a decoupling of trait correlations under these conditions, indicating potential disruptions in alpine ecosystem services. These findings underscore the need for nuanced management strategies to balance native plant survival with invasive species control in culturally and scientifically valuable alpine habitats.
Barriers and Obstacles to International Travel
New Zealand's Tongariro National Park stands out as a model for sustainable tourism, demonstrating how destinations can balance environmental conservation with visitor experience. The study highlights the pandemic's role in exacerbating travel barriers, including visa requirements and airline policies, while proposing corrective measures like the Airline Passenger Bill of Rights. By analyzing these challenges, the research underscores New Zealand's leadership in sustainable practices, positioning Tongariro as an 'ideal' destination committed to long-term ecological preservation.
Low host-plant nitrogen contributes to poor performance of heather beetle, an introduced weed biocontrol agent in New Zealand
Low nitrogen levels in heather plants likely explain the poor performance of the introduced heather beetle, an intended biocontrol agent for non-native heather in Tongariro National Park (TNP), New Zealand. The study found that heather in TNP has significantly lower nitrogen content (1.14% dry weight) compared to European samples (1.48%), a difference attributed to New Zealand's low air pollution and infertile soils. Fertilizing heather in controlled experiments increased its nitrogen levels, which in turn boosted beetle oviposition by 35% and adult body mass by 28%. Field trials from 2001 to 2015 further confirmed improved beetle performance on fertilized plots. These findings suggest that host-plant quality, specifically nitrogen content, may be a critical but understudied factor in the success of weed biocontrol agents.
Aotearoa New Zealand
New Zealand's architectural conservation efforts highlight its innovative approaches to preserving Indigenous Māori heritage, as demonstrated by the ICOMOS New Zealand Charter for the Conservation of Places of Cultural Heritage Value. This study examines how the country balances strong private property rights with heritage protection, while navigating challenges like seismic activity and resource management legislation. It also underscores the significance of Tongariro National Park, the first World Heritage site inscribed as an associative cultural landscape, reflecting New Zealand's unique contributions to global heritage conservation.
Temperature dependency of litter decomposition is not demonstrated under reciprocal transplantation of tussock leaves along an altitudinal gradient
A study on litter decomposition in Tongariro National Park, New Zealand, reveals that temperature does not significantly influence the rate of carbon sequestration through soil decomposition. Researchers examined the decomposition of Chionochloa rubra leaf litter across an 700-meter altitudinal gradient over four years, representing a 4.2°C warming scenario. Despite variations in litter quality and micro-environmental conditions, decomposition rates remained consistent regardless of altitude or temperature. The study's reciprocal transplantation approach, involving the translocation of litter bags between eight plots, demonstrated no home-field advantage or significant interactions between origin and destination data. These findings suggest that projected climate warming may not directly impact decomposition rates or carbon sequestration in natural ecosystems, except possibly under different moisture regimes.
Impact of Climate Warming and Plant Invasion on the Soil Microbial Community in Alpine Zones
Alpine ecosystems, particularly vulnerable to climate warming and plant invasion, experience significant shifts in soil microbial communities due to changes in plant composition. A study in Tongariro National Park, New Zealand, found that the invasion of Common Heather (Calluna vulgaris) reduced arbuscular mycorrhizal fungi (AMF) colonization in native Red tussock grass (Chionochloa rubra), decreased plant size and cover, yet did not alter general microbial group proportions. Additionally, a global analysis using the Warming and Removal in Mountains (WaRM) network revealed that removing dominant plant species significantly impacted fungal and bacterial abundances, while warming had no significant effect. Elevation played a crucial role in microbial biomass and composition, highlighting the importance of understanding alpine elevational gradients for predicting global change impacts on these ecosystems.
Characterising the response of plant-mycorrhizal networks to a changing alpine environment
Climate change and invasive species are destabilizing alpine plant-mycorrhizal networks, particularly in New Zealand’s Tongariro National Park. Warming increases fungal diversity for invasive Common Heather (Calluna vulgaris) while reducing it for native plants, also weakening the robustness of native plant-mycorrhizal interactions. The study used a factorial experiment combining warming and heather removal to analyze fungal community composition and network structure via DNA sequencing and bipartite network analysis. Findings reveal that warming and invasion interact synergistically, fragmenting native plant networks and highlighting the vulnerability of alpine ecosystems to multiple drivers of change.
Wish you were here? Building on Aotearoa's sacred land in the age of colonisation and overtourism.
Tongariro National Park, home to sacred peaks gifted to the Crown over a century ago, faces significant challenges from overtourism and colonization. Annual completion of the Tongariro Alpine Crossing (TAC) by 142,000 people disrupts both the environment and the spiritual essence (mauri) of the mountains. This study introduces six architectural interventions designed to mitigate these impacts while promoting decolonization. Using a 'research-through-design' methodology, the study combines literature review, site observations, and expert stakeholder input to create outcomes that address overtourism and colonization holistically. A theoretical framework ensures that visitors experience the TAC in a manner that aligns with the park's cultural and environmental values.
Comparing biocontrol and herbicide for managing an invasive non‐native plant species: Efficacy, non‐target effects and secondary invasion
A five-year field trial in Tongariro National Park, New Zealand, revealed that biocontrol using the beetle Lochmaea suturalis was more effective than herbicide (Pasture Kleen®) at reducing heather cover by 97% compared to 87%, while also benefiting native dicot species. Unlike herbicide, which caused significant non-target impacts on native dicots, biocontrol increased their cover and species richness. Both methods led to an eightfold rise in non-native monocots, but secondary invasion was greater with biocontrol due to increased non-native dicot cover. The study suggests that biocontrol may offer broader ecosystem benefits despite higher secondary invasion risks.
Preserving the Outstanding
Tongariro National Park, home to the iconic Mt Ruapehu, faces growing pressures from increased tourism and climate change, threatening its sustainability. While ski fields like Whakapapa operate seasonally, relying on unreliable snow conditions, the park's potential for year-round activities remains underutilized. A key insight is that landscape planning can mitigate environmental damage caused by unmarked trails and overuse while enhancing visitor experiences. The study proposes sustainable, accessible pathways that immerse users in the landscape, reducing erosion and ecological harm. By diversifying activities beyond skiing and promoting responsible tourism, this approach aims to preserve Mt Ruapehu's outstanding natural value for future generations.
Seasonal litterfall composition and carbon and nitrogen returns in New Zealand shrubland
Manuka–kanuka shrublands, significant carbon sinks in New Zealand, exhibit distinct seasonal patterns in litterfall composition and nutrient returns. Research at Tongariro National Park and Stoney Creek revealed that total litterfall ranges from 3557 to 4443 kg ha⁻¹ year⁻¹, with leaf material contributing 46–67%. Litterfall peaks during spring–summer months, with higher rates observed at the lower-altitude Stoney Creek site. Carbon inputs range between 1941 and 2448 kg C ha⁻¹ year⁻¹, while nitrogen inputs are between 28 and 37 kg N ha⁻¹ year⁻¹, predominantly in leaf material. Despite similar rainfall and shrub ages at both sites, litterfall rates differ, suggesting site-specific variations. The study highlights the importance of understanding litterfall dynamics to assess the resilience of these ecosystems under climate change.
The basement morphology under Tongariro National Park, southern Taupo Volcanic Zone
A deep, asymmetric trough underlies Tongariro National Park, extending from the southern end of Lake Taupo and reaching beneath Mt. Tongariro before diminishing near Mt. Ruapehu. This geological feature, up to 2.5 km deep, was revealed through analysis of gravity data collected in the 1950s and 1960s, processed into Bouguer anomalies at an elevation of 500 meters. Researchers separated regional and residual anomalies, derived sediment density-depth relationships from borehole measurements, and used 2D gravity modeling to construct a 3D structural model. The study provides critical insights into the subsurface morphology of the southern Taupo Volcanic Zone, contributing to our understanding of volcanic activity in this UNESCO World Heritage Site.
Calibrating the amplitude source location (ASL) method by using active seismic sources: An example from Te Maari volcano, Tongariro National Park, New Zealand
A study on Te Maari volcano, Tongariro National Park, reveals that the amplitude source location (ASL) method can produce significant location discrepancies—up to 1.0 km laterally and 500 m in depth—when using independently determined velocity models, attenuation factors, and site amplification factors (AFs). Sensitivity tests show that while attenuation and velocity have a moderate influence on ASL accuracy, AFs strongly impact location precision, potentially introducing substantial uncertainties. The research demonstrates that model uncertainties can affect either lateral or depth estimates depending on input parameters, station corrections, and source-station geometry, providing critical insights for refining seismic monitoring techniques in volcanic regions.
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