Biodiversity strategies
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Filterra at Owairaka subdivision
Available land area within the subdivision was insufficient to accommodate conventional low-rate raingardens designed under prescriptive Auckland guidance, necessitating an alternative stormwater treatment approach that could demonstrate equivalent contaminant removal performance within a smaller footprint. A proprietary Filterra® high-rate biofiltration system was installed as part of the subdivision’s integrated stormwater management strategy to treat runoff…
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Wellington Town Belt
Historical vegetation clearance, infrastructure encroachments, and persistent pressure from introduced predators reduced habitat quality and weakened ecological connectivity across the urban landscape. Research shows that fragmented green spaces perform poorly for Indigenous species compared with connected networks, highlighting the need to manage the Wellington Town Belt as part of a wider system. The Wellington Town…
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Kete Tiles
Conventional seawalls or constructed foreshores like rock rip-rap typically lack the crevices, pools, and surface variation required by intertidal organisms. This results in reduced species richness and abundance compared to natural coastal systems. Space constraints and infrastructure requirements limit the feasibility of replacing seawalls with “soft” coastal edges, necessitating retrofit approaches. Kete Tiles were developed…
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Biodiverse residential development: A review of New Zealand policies and strategies for urban biodiversity
ABSTRACT Urban residential development is expanding globally to accommodate increasing housing demand, greatly impacting biodiversity and human wellbeing. Enhanced sustainability of these developments requires an integrated approach to conserving, supporting, and restoring biodiversity through the built environment and understanding the implications of residential development policies, regulations, and guidelines. This paper details a review of current New Zealand…
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The New Zealand Biodiversity Factor—Residential (NZBF-R): A Tool to Rapidly Score the Relative Biodiversity Value of Urban Residential Developments
The loss of biodiversity in urban residential areas that are densifying in response to increasing housing demand has serious implications for urban ecosystem functioning and human wellbeing. There is an urgent need for integrating biodiversity-sensitive design into urban planning and development. While several existing “Green Factor” tools guide greening strategies in cities, none have biodiversity…
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Christchurch urban streams
Urban development, channelisation, stormwater inputs, and post-earthquake land-use changes have modified stream hydromorphology, water quality, and ecological condition across the network. Recovery is constrained by ongoing urban pressures, limited riparian buffers, and the absence of coordinated catchment-scale management. A coordinated programme of monitoring, management, and restoration has been implemented across Christchurch’s urban stream network, including…
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Kākā nest box programme
While predator eradication at Zealandia provided a source population, urban expansion of kākā raised questions about cavity availability to support continued breeding outside the sanctuary. Mature trees with suitable natural cavities are scarce in many suburban Wellington environments. Nest boxes designed to meet the cavity dimensions required by kākā were installed on trees across Wellington…
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Project Twin Streams
The Twin Streams catchment was characterised by degraded riparian margins, invasive vegetation, and poor water quality associated with urban land use. Fragmented stream corridors limited ecological function and community connection to local waterways. A sustained, community-centred restoration programme was implemented along both stream corridors, removing invasive riparian vegetation, establishing over 500,000 native plants, and engaging…
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Tawatawa Reserve lizard garden
Urban reserves typically lack the rock-based microhabitats, basking surfaces, and refugia required by native skinks and geckos. Small habitat features are often implemented without site-specific monitoring, making outcomes uncertain and limiting evidence of effectiveness. A small lizard garden was established near the City to Sea Walkway, featuring arranged rock piles providing shelter, crevices, and basking…
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Oamaru blue penguin underpass
Repeated at-grade road crossings by penguins at a predictable point created an ongoing conflict between transport operations and wildlife movement. Local authority records describe “tens of penguins” crossing at this location, indicating the need for a targeted, site-specific mitigation response. A purpose-built underpass was installed beneath Waterfront Road to provide a dedicated crossing route aligned…
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Urban Canopee
Hutt and Halifax Streets are constrained by underground services, limited soil volume, and narrow verges, restricting opportunities for large-canopy street trees. This limited the capacity to provide shade and pedestrian thermal comfort using conventional urban forestry approaches. Two lightweight bioshading structures were installed to introduce vegetated shade within the existing streetscape, using steel frames with…
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Wynyard Quarter bioswales
Conventional piped stormwater systems provided limited treatment of road runoff before discharge to the harbour. The precinct required visible, at-source treatment systems that could operate within a constrained public-realm streetscape and meet Auckland Council and Auckland Transport performance requirements. Linear bioswales were installed along Jellicoe Street and others as part of an integrated water-sensitive design…
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Hundertwasser Wairau Māori Arts Centre
Delivering a structurally compliant intensive green roof with complex planting on a public building required reconciliation of high substrate loads, irregular roof geometry, long-term maintenance obligations, and local climatic exposure. An intensive green roof system was integrated across the building roofscape as part of the core architectural form, covering approximately 980 m² with engineered growing…
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Kaicycle Urban Farm
Organic food waste from households and hospitality businesses was largely landfilled, while opportunities for local composting and food growing within the urban area were limited. Space constraints, volunteer reliance, and regulatory requirements for composting posed operational limits. Kaicycle established an integrated system linking food scrap collection using electric cargo bicycles, on-site aerobic composting, and small-scale…
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Te Kaitaka/Greenslade Reserve
Frequent flooding in the Awataha catchment placed pressure on downstream neighbourhoods and the Northcote town centre, while conventional underground upgrades alone offered limited capacity for extreme rainfall events. The challenge was to increase flood storage and peak-flow attenuation without removing valued recreational open space. Greenslade Reserve was redesigned to operate as a floodable landscape that…
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Aidanfield vegetated swale and detention pond
Conventional piped stormwater systems provided limited treatment, attenuation, or ecological value, and increased downstream pressure on waterways. New subdivisions were required to meet hydrological performance standards while responding to emerging expectations around environmental and amenity outcomes. The Aidanfield vegetated swale and overflow detention/infiltration pond treatment train was integrated into the subdivision layout to manage stormwater…
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Gardenstar tool
There was a gap between household interest in backyard biodiversity and access to practical, user-friendly assessment and improvement guidance. Research-led residential biodiversity tools are designed for repeatable scoring and application by practitioners or institutions, making them less directly accessible for household self-use. Gardenstar was developed as an online, qualitative self-assessment tool that enables householders to…
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Te Māra Hūpara playground
Conventional playground models were poorly suited to a dynamic floodplain environment and risked visual and functional conflict with stream restoration objectives. The site required a play intervention that could coexist with flood management works, respect and celebrate cultural values incorporating mātauranga Māori, and avoid introducing rigid or maintenance-intensive structures. A traditional Māori, landscape-led playground was…
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Kirimoko Park
Conventional subdivision approaches in similar contexts typically pipe and hard-engineer stormwater, removing natural drainage features. For Kirimoko Park, subdivision design needed to manage stormwater while accommodating development within gullies and landforms defined through the resource consent process. Stormwater and open space were spatially integrated into the subdivision layout, with existing gullies retained as open space…
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Transmission Gully Motorway
Large-scale earthworks on erodible soils and steep slopes posed a high risk of sediment discharge, runoff contamination, and slope instability during both construction and operation. Regulatory approvals required demonstrable management of these risks, rather than net ecological enhancement. The project implemented a comprehensive, consent-driven environmental management framework including construction-phase erosion and sediment controls, operational stormwater…
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Te Kauwhata Community Compost Hub
Food scraps from households and the school were being disposed of via landfill, contributing to avoidable organic waste volumes and associated emissions. Prior to the project, there was limited local infrastructure or a coordinated programme to support community-scale composting and applied waste education. A community compost hub was established using a managed hot-composting system designed…
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New Zealand Garden Bird Survey
Prior to the New Zealand Garden Bird Survey, there was no systematic, nationally coordinated monitoring of bird trends in urban gardens and green spaces. Existing monitoring programmes focused primarily on conservation land, leaving urban environments as an ecological blind spot in national biodiversity surveillance. An annual citizen science bird count was designed and implemented, asking…
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Matairangi Nature Trail
Existing public access to Matairangi focused primarily on recreation and viewpoints, with limited infrastructure to engage people with the ecological and cultural values of the hill’s vegetation and wildlife. A dedicated nature trail was established with interpretive signage, native planting, and designated routes to encourage ecological awareness and outdoor learning for a range of user…
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Uwhi Harakeke Weed Mats
Existing aquatic weed management approaches lack culturally appropriate, biodegradable alternatives aligned with mātauranga Māori principles of kaitiakitanga and working with natural materials. There was a need for a practical tool that could suppress weed growth without introducing harmful materials or requiring intensive intervention. Weed suppression mats woven from harakeke (New Zealand flax) were developed and…
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Long Bay neighbourhood development
Greenfield subdivision at this scale posed risks of increased runoff volume and contaminant loads to downstream streams and coastal waters. Regulatory frameworks required stormwater effects to be mitigated within the development footprint rather than deferred to end-of-catchment infrastructure. The development adopted a landscape-led structure in which distributed stormwater treatment systems — including constructed wetlands, swales,…
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Otari-Wilton’s Bush
As with many urban forest remnants, Otari–Wilton’s Bush is subject to edge effects, invasive species pressure, and long-term impacts from introduced mammalian predators, constraining regeneration and biodiversity outcomes. Long-term protection and management of remnant forest and native plant collections has been maintained under a formal council management framework, including sustained possum control, maintenance of Indigenous…
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St Albans stream restoration
The stream exhibited eroding banks, limited Indigenous riparian vegetation, and poor perceived ecological condition. Broader Christchurch monitoring indicates that reach-scale restoration is constrained by upstream land use, altered hydrology, flood conveyance requirements, and persistent stormwater inputs. Restoration focused on low-impact riparian enhancement and community stewardship, including Indigenous riparian planting, removal of invasive species, community planting…
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Urban Ngahere (Forest) Strategy
Urban tree management was historically fragmented, with limited coordination across local boards and insufficient protection of existing canopy, particularly on private land. Canopy loss associated with redevelopment and infrastructure upgrades continued despite individual notable tree protections. Auckland Council adopted a regional urban ngahere strategy to guide the protection, enhancement, and expansion of urban tree cover…
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Hakanoa Reserve pollinator pathway
Conventional amenity planting in small reserves provided limited nectar and pollen resources for pollinating insects and offered little contribution to emerging neighbourhood-scale pollinator initiatives. Flower-rich planting was introduced within Hakanoa Reserve to support urban pollinators and contribute to a wider, informal pollinator pathway concept in Grey Lynn, with an emphasis on seasonal continuity of floral…
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Fungal inoculation in native plantings
Native woody species have often shown poor survival and growth when planted into degraded Mackenzie Basin soils using standard restoration methods. Evidence indicates that mycorrhizal benefits are highly dependent on soil phosphorus availability and plant–fungal compatibility, rather than simple presence or absence of mycorrhizal fungi. A field experiment tested whether arbuscular mycorrhizal fungal inoculation could…
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Mōtū Manawa–Pollen Island Marine Reserve
Prior to protection, estuarine habitats in the inner Waitematā Harbour were subject to cumulative pressures including reclamation, sedimentation, stormwater inputs, and coastal development. These pressures reduced habitat quality and ecological integrity, while limiting opportunities to understand estuarine ecological processes in an urban context. A no-take marine reserve was established to protect intertidal and shallow subtidal…
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Waiwhakareke Natural Heritage Park
Pasture and exotic-dominated vegetation provided limited habitat value, simplified ecological structure, and minimal representation of indigenous wetland and lowland forest systems characteristic of the Hamilton Basin. Large-scale ecological reconstruction was required within an urban growth context. A long-term, staged ecological restoration programme was implemented to reconstruct Indigenous ecosystems across the site, restoring a full landscape…
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Zealandia
Introduced mammalian predators had caused severe declines and local extinctions of native forest birds, reptiles, and invertebrates across mainland New Zealand. Conservation initiatives primarily focused on off-shore islands, away from where most people live. Fragmented urban habitats and ongoing reinvasion pressure limited the effectiveness of conventional, unfenced predator control. A fully fenced mainland ecosanctuary was…
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Ōtākaro Avon river catchment
Prior to and following the earthquakes, the catchment experienced degraded ecological condition associated with reduced indigenous riparian vegetation, fragmented habitat, altered hydrology, and ongoing stormwater contaminant inputs. These pressures limited freshwater biodiversity values and constrained floodplain function, particularly in lower reaches of the river. Post-earthquake regeneration planning reframed the red-zoned river corridor as a multifunctional…
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Wellington Cable Car Building
Location: Wellington, Te Whanganui-a-Tara, Aotearoa New Zealand Project type: Transport infrastructure retrofit / wildlife impact mitigation Delivery/lead organisations: Wellington Cable Car Ltd; Wellington City Council; Urban Wildlife Trust Date/period: 2022–2023 Scale: Site Primary system or theme: Urban biodiversity / bird–building interactions Context Why this site matters The Wellington Cable Car summit terminal sits adjacent to…
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Wellington Rain Gardens
Conventional kerb-and-pipe systems conveyed sediment- and metal-laden runoff from heavily trafficked streets with limited on-site treatment, contributing to contaminant loads in receiving waters. Retrofitting treatment systems was constrained by narrow road reserves, underground services, pedestrian movement, and streetscape performance requirements. Wellington City Council implemented street-side rain gardens and tree pits along Lower Cuba Street and…
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Daldy Street Community Garden
Residents and workers in the Wynyard Quarter had limited opportunities for local food growing or hands-on participation in green space management within a dense, predominantly hardscaped urban environment. A volunteer-run community garden was established using raised beds and planters within the public realm to enable shared food growing and collective stewardship.
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Sanctuary Mahi Whenua Community Garden
Following the end of its role as a formal teaching garden, the site required a governance and management model that could maintain productive use, ecological practices, and public access without institutional resourcing. The garden operates without formal ecological performance monitoring, limiting evidence-based assessment of biodiversity outcomes. The site transitioned to community stewardship, with management focused…
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Oamaru blue penguin underpass
Location: Oamaru Harbour, Otago, Aotearoa New Zealand Project type: Site-specific wildlife mitigation infrastructure Delivery/lead organisations: Oamaru Blue Penguin Colony (Tourism Waitaki Ltd); Waitaki District Council Date/period: c.2017 – present Scale: Site Primary system or theme: Terrestrial–coastal wildlife movement (kororā / little blue penguin) Context Why this site matters Oamaru Harbour supports an established colony of…
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Urban wildlife sanctuaries
Definition Introduced predator-managed or excluded areas within cities that provide secure habitat for Indigenous species otherwise unable to persist in urban environments. Urban wildlife sanctuaries are also sometimes called ecological islands. What this strategy doesCreates protected habitat patches through introduced predator control, fencing, and habitat restoration, and supports dispersal into the surrounding urban matrix. Sustained…
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Urban green spaces
Definition Urban green spaces are vegetated areas within cities, such as parks, streetscapes, gardens, and green roofs, that support native biodiversity and ecological processes within the built environment. What this strategy doesProvides habitat, refuge, and movement pathways for native species while delivering ecosystem services in urban areas; excludes ornamental-only or ecologically simplified landscapes. ContextIn Aotearoa…
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Urban forest restoration
Definition Urban forest (ngāhere) restoration is the intentional establishment and enhancement of native forest ecosystems within urban environments to restore biodiversity, ecological function, and long-term canopy cover. What this strategy doesCreates multi-layered native forest structure through staged planting, soil remediation, and long-term management. Avoids short-term amenity planting that does not support forest succession. ContextUrban environments…
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Urban blue spaces
Definition Urban blue spaces are water bodies and water-dependent habitats within urban areas that support aquatic and semi-aquatic biodiversity and ecological processes. What this strategy doesIntegrates rivers, streams, wetlands, ponds, and coastal edges into urban form to provide habitat, improve water quality, and maintain hydrological and ecological connectivity, while managing human use and urban pressures.…
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Soil regeneration
Definition Soil regeneration restores and enhances soil health, biodiversity, and ecosystem function through physical, chemical and biological interventions. Key considerations include rebuilding of soil organic matter, structure, invertebrate populations, microbiomes, and nutrient cycling. Healthy soils are characterised by structure that allows drainage and gas exchange and organic matter that stores and releases nutrients and water…
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Soil preservation
Definition Soil preservation protects and maintains soil structure, biological function, and ecological performance during construction and development. Protecting urban soil is crucial because it supports building construction and plant production, it is an interface with the atmosphere and hydrosphere and it is a source of key functions and services for urban systems sustainability and therefore…
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River daylighting and culvert naturalisation
Definition River daylighting (culvert naturalisation) is the removal or modification of buried, piped, or concrete-lined urban waterways to restore open, naturalised stream channels with riparian margins. What this strategy doesReopens buried streams, reinstates natural channel form and riparian vegetation, and reconnects aquatic and terrestrial habitats. Avoids fully engineered, uniform channels where ecological recovery is a…
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Pollinator pathways and flora plantings
Definition Pollinator pathways and flora plantings are connected networks of flowering vegetation that provide continuous foraging and habitat resources for pollinators across urban environments. What this strategy doesCreates linked planting corridors that support pollinator movement and persistence. Avoids isolated, single-species, or short-duration plantings. ContextUrbanisation fragments habitat and limits pollinator movement; coordinated planting improves ecological connectivity…
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Urban water features
Definition Urban water features are designed aquatic elements (e.g. ponds, fountains, water walls, streams) that provide habitat, drinking, and bathing resources for urban wildlife. What this strategy doesCreates small but ecologically functional water habitats within built environments; avoids purely ornamental, sterile, or hard-edged water design. ContextIn urban environments with limited natural freshwater, well-designed water features…
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Urban street trees
Definition Urban street trees are woody perennial plants intentionally planted and managed within road reserves and footpaths to provide habitat, movement corridors, and ecosystem services within urban environments. What this strategy doesIntroduces and manages diverse, well-sited street trees to support urban biodiversity, climate resilience, and human wellbeing, while avoiding monocultures and infrastructure conflict. ContextIn Aotearoa…
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Urban riparian restoration and shading
Definition Urban riparian restoration and shading restores vegetated margins along urban waterways using native planting to create continuous or semi-continuous canopy cover that supports freshwater health, biodiversity connectivity, and urban microclimate regulation. What this strategy doesRe-establishes native riparian vegetation to shade channels, stabilise banks, filter runoff, and provide habitat. Avoids isolated or purely ornamental plantings…
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Stormwater planters
Definition Stormwater planters are engineered green infrastructure systems that intercept, filter, and temporarily store urban runoff using planted soil media. What this strategy doesTreats stormwater at source while providing small, distributed habitat patches integrated into streets and developments. Avoids reliance on purely grey conveyance systems. ContextIn highly impervious urban environments, stormwater planters provide a space-efficient…
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Stepping stone habitats
Definition Stepping stone habitats are small, distributed patches of natural or semi-natural habitat within urban areas that enable species movement between larger habitat areas. What this strategy doesProvides intermittent habitat nodes that support dispersal, foraging, and refuge across fragmented urban landscapes, without requiring continuous corridors. ContextIn Aotearoa New Zealand cities, high fragmentation, limited Indigenous vegetation…
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Rain water gardens
Definition Rain water gardens are shallow, vegetated basins that capture, slow, and filter stormwater runoff from impervious surfaces, allowing water to infiltrate through planted soils. What this strategy doesManages stormwater at source while supporting vegetation, soil processes, and limited aquatic habitat. Avoids hard-engineered, single-function drainage solutions. ContextIn urban Aotearoa New Zealand, rain water gardens support…
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Planting for biodiversity
Definition Planting for biodiversity uses eco-sourced native vegetation to create, restore, and connect habitats that support Indigenous species and ecological processes, including the reintroduction of locally appropriate or rare species where suitable. What this strategy doesDelivers multi-layered native planting that supports fauna, soil health, and ecosystem function; includes revegetation, climate-adapted planting, and soil and water…
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Permeable paving
Definition Permeable paving and permeable surfacing are hardscape systems designed to allow rainfall to infiltrate through the surface into underlying layers, reducing runoff and supporting soil, water, and vegetation functions within urban environments. What this strategy doesReplaces impermeable sealed surfaces with porous or permeable materials that manage stormwater at source and reduce soil sealing. Avoids…
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Natural playgrounds
Definition Natural playgrounds are outdoor play spaces that integrate native vegetation and natural materials to support unstructured play while creating small, functional habitats for urban biodiversity. What this strategy doesProvides nature-based play opportunities for children while contributing to local habitat creation and ecological connectivity. Avoids highly standardised, synthetic play equipment with no ecological function. ContextIn…
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Natural micro-habitats
Definition Natural micro-habitats are small-scale landscape features that provide shelter, thermoregulation, refuge, and foraging opportunities for native fauna within urban and modified environments. What this strategy doesIntroduces or retains logs, rocks, hollows, and dense vegetation, as well as basking areas for lizards, to support the everyday habitat needs of native species while avoiding large-scale earthworks…
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Monitoring for biodiversity
Definition Monitoring for biodiversity is the systematic measurement of species presence, abundance, and habitat condition over time to assess whether design and management actions are achieving intended biodiversity outcomes, including through building-integrated and community-based monitoring approaches. What this strategy doesEstablishes baselines, tracks ecological change, and informs adaptive management of planting, habitat structures, and maintenance. Supports…
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Maintenance for biodiversity
Definition Maintenance for biodiversity is the design and ongoing management of urban green and blue spaces to sustain ecosystem health, support native species, and reduce chronic anthropogenic pressures, including the intentional use of low-disturbance and biodiversity-sensitive maintenance regimes. What this strategy doesReduces chemical inputs, mowing intensity, disturbance, noise, and domestic predator impacts while maintaining visible…
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Integrating mātauranga Māori
Definition Integrating mātauranga Māori (Māori knowledges) into biodiversity design applies values, practices, and place-based knowledge to guide ecological design, species selection, and long-term stewardship in urban environments. This must be undertaken under the guidance of mana whenua (local hapū or iwi), with their participation and permission. Note: This page uses very brief English translations of…
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Green wildlife corridors bridges and belts
Definition Connected networks of vegetated or aquatic spaces that enable movement of species across fragmented urban landscapes. What this strategy doesLinks isolated habitats using linear green or blue elements (e.g. corridors, bridges, riparian belts). Avoids isolated “green islands” with no functional connectivity. ContextUrban development in Aotearoa New Zealand has fragmented Indigenous habitats, limiting species movement…
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Compact high-yield urban agriculture techniques
Definition Design approaches that enable intensive food production in limited urban space through efficient spatial layouts, resource use, and crop management. What this strategy doesSupports food production on constrained sites using intensive planting, controlled growing systems, and small-footprint infrastructure; avoids low-density or land-extensive agricultural models. ContextIn urban and peri-urban New Zealand settings, land scarcity, soil…
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Community gardens
Definition Shared, collectively managed green spaces that integrate food production and habitat features to support urban biodiversity. What this strategy doesProvides small-scale, fine-grained habitat within neighbourhoods while supporting social participation and food growing. Avoids single-use, ornamental-only planting and short-term temporary installations. ContextIn Aotearoa New Zealand cities, community gardens frequently occupy fragmented or low-value land but…
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Building-integrated vegetation
Definition Building-integrated vegetation (BIV) is the deliberate incorporation of living plant systems into and onto building structures, including green roofs, living walls, vegetated façades, and vegetated balconies. What this strategy doesIntegrates vegetation into buildings to provide habitat, microclimate regulation, and ecological connectivity in dense urban environments. Enhances and connects with, rather than replaces ground-based ecosystems,…
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Building for biodiversity
Definition Building for biodiversity is the integration of building and urban design measures that avoid wildlife harm and actively support habitat, ecological processes, and species persistence within developed environments including the incorporation of building-integrated and adjacent habitats. What this strategy doesReduces direct ecological impacts (e.g. collisions, light disturbance, noise, and habitat disruption) and integrates habitat…
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Living stabilisation systems
Definition Living stabilisation systems are bioengineered walls and slopes that integrate vegetation and natural materials into retaining, shoreline, and slope infrastructure to reinforce soils while providing ecological function. Examples include vegetated retaining walls, planted crib walls, living crib walls using live stakes, brush mattresses, and living shorelines. What this strategy doesCombines engineered structural systems with…
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Artificial micro-habitats
Definition Artificial micro-habitats are purpose-designed structures integrated into buildings and infrastructure to provide small-scale shelter, refuge, or breeding opportunities for biodiversity where natural habitat is limited. What this strategy doesThis strategy introduces targeted habitat features, such as: Nesting boxes Invertebrate hotels Façade-integrated recessions, ledges, or niches Gabion walls (for lizards and insects) Biodiversity tiles (in…
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Detention ponds
Definition Detention ponds are engineered stormwater facilities that temporarily store and slowly release runoff to reduce peak flows and manage water quality. What this strategy doesProvides flood attenuation and water treatment, and when designed with ecological principles, can support freshwater and riparian biodiversity. Avoids single-purpose, hard-edged basins with rapid drawdown and no vegetated margins. ContextIn…
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Container gardens
Definition Container gardens are portable planted systems using pots or planters to support vegetation where in-ground planting is not possible. What this strategy doesIntroduces small-scale planting on rooftops, balconies, courtyards, and hardscaped sites to extend green infrastructure into highly urbanised areas. Container gardens do not replace in-ground habitat or larger-scale ecological restoration. ContextIn dense urban…
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Constructed wetlands
Definition Constructed wetlands are deliberately designed wetland systems that use vegetation, soils, and microbial processes to manage stormwater and improve water quality within urban environments. What this strategy doesTreats and attenuates urban runoff while creating semi-natural aquatic habitat. Avoids reliance on fully engineered, energy-intensive water treatment systems. ContextIn urban Aotearoa New Zealand, constructed wetlands are…
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Buffers
Definition Buffers are vegetated or natural zones that reduce ecological impacts from adjacent urban land uses by creating a gradual transition between developed areas and sensitive ecosystems. What this strategy doesBuffers filter pollutants, stabilise soils, reduce disturbance, and provide habitat and movement space between urban uses and ecological systems. ContextIn urban and peri-urban Aotearoa New…
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Bioswales
Definition Bioswales are linear, vegetated stormwater channels that slow, filter, and infiltrate runoff using engineered soils and planting. What this strategy doesManages surface runoff while providing modest habitat and water-quality benefits; not intended to replace natural streams or wetlands. ContextIn Aotearoa New Zealand urban environments, bioswales are a core component of water-sensitive design, addressing increased…
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Bioshading
Definition Bioshading is the intentional use of vegetation to provide shade while supporting ecological function in urban and peri-urban environments. What this strategy doesUses trees, climbers, and planted structures to reduce heat exposure and create habitat. Avoids purely ornamental planting that provides shade without ecological value. ContextIn Aotearoa New Zealand cities, increasing urban heat and…
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Biofilters
Definition Biofilters are engineered planted systems that treat stormwater runoff by filtering water through layered substrates and vegetation. What this strategy does Treats stormwater close to the source using soil, plants, and microbial processes Reduces pollutant loads entering streams while integrating vegetation into the urban fabric ContextIn Aotearoa New Zealand, urban runoff is a major…
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Backyard gardens
Definition Backyard gardens are privately managed residential green spaces that, when intentionally designed and maintained, can provide habitat, food resources, and ecological connectivity within urban environments. What this strategy doesThis strategy leverages cumulative, small-scale planting, habitat features, and low-intensity management across private properties to support urban biodiversity. ContextIn many Aotearoa New Zealand cities, private residential…
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Animal movement infrastructure
Definition Animal movement infrastructure comprises purpose-built structures that enable wildlife, including fish, to move safely through human-modified landscapes, including roads, railways, waterways, and urban development. What this strategy doesThis strategy reduces habitat fragmentation by providing crossings, passages, and corridors that support safe movement and dispersal of wildlife. It avoids ad-hoc or poorly sited structures that…
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