Definition
Connected networks of vegetated or aquatic spaces that enable movement of species across fragmented urban landscapes.
What this strategy does
Links isolated habitats using linear green or blue elements (e.g. corridors, bridges, riparian belts). Avoids isolated “green islands” with no functional connectivity.
Context
Urban development in Aotearoa New Zealand has fragmented Indigenous habitats, limiting species movement and ecological function. Corridors are a recognised mechanism for improving functional connectivity where large, continuous reserves are not feasible.
Technical considerations
Design considerations
Spatial connectivity
Design corridors to physically link existing habitat patches, prioritising continuous vegetation cover or water pathways over fragmented planting.
Vegetation structure
Provide multi-layered native vegetation (canopy, understory, groundcover) rather than relying on tree-only planting, as structural diversity is more strongly associated with increased urban biodiversity.
Integrated green infrastructure
Where ground-level continuity is constrained, use green roofs, green walls, or riparian systems as stepping-stone connections, recognising that performance depends on substrate depth, planting diversity, and microclimate suitability.
Implementation considerations
Design priority
Align corridor routes with existing reserves, waterways, and street networks to maximise continuity and minimise land acquisition requirements.
Key constraint
Corridors alone do not protect vulnerable native fauna from introduced predators; predator control or exclusion measures are often required for ecological effectiveness in Aotearoa New Zealand.
Relevant tools or standards
Least-cost path and resistance modelling can support corridor alignment and prioritisation at neighbourhood and city scales.
Issues and barriers
Habitat fragmentation
Limited space in dense urban areas can reduce corridor width and continuity, constraining effectiveness for some species.
Predation pressure
Introduced mammalian predators significantly limit biodiversity outcomes where habitat creation is not paired with pest management.
Planning integration
Biodiversity is often considered late in urban design processes, reducing opportunities to embed continuous corridors across multiple sites or developments.
Synergies and opportunities
Climate change
Vegetated corridors contribute to urban cooling and microclimate regulation, supporting climate adaptation benefits alongside biodiversity outcomes.
Human wellbeing
Access to connected, biodiverse green spaces is associated with improved psychological wellbeing and restorative experiences.
Freshwater security
Riparian and blue–green corridors can improve stormwater attenuation, water quality, and flood resilience while supporting aquatic and terrestrial connectivity.
Financial case
Ecosystem services and/or performance value
Infrastructure cost reduction
Blue–green corridors can reduce reliance on engineered stormwater infrastructure and associated long-term maintenance costs.
Cost-effectiveness
Investment logic
When embedded early at a network scale, corridors deliver multiple co-benefits such as biodiversity, climate adaptation, and wellbeing from shared land and infrastructure investments.
Monitoring and evaluation metrics
Core metric
Change in Indigenous vegetation cover, patch size, and connectivity (e.g. least-cost path distance between habitat nodes).
Advanced or long-term metric
Presence, abundance, or movement of indicator native species using council or Department of Conservation monitoring datasets.
Case study
Wellington Town Belt
Related design strategies
- Maintenance for biodiversity
- Monitoring for biodiversity
- Planting for biodiversity
- Pollinator pathways and flora plantings
- Stepping stone habitats
- Urban forest restoration
- Urban green spaces
- Urban riparian restoration and shading
- Urban street trees
- Urban wildlife sanctuaries and ecological islands
Additional resources or tools
Ecological corridors and habitat connectivity guidance
https://environment.govt.nz/assets/publications/Environmental-Reporting/6.8-Landscape-connectivity.pdf
Restoring urban and rural ecosystems
https://www.landcareresearch.co.nz/assets/researchpubs/Conserving-and-Restoring-Biodiversity-in-New-Zealand-Urban-and-Rural-Environments.pdf