Size: 173 hectares
The Omaha Sequence biodiversity focus area is located at Omaha and includes:
- Omaha Taniko Wetlands Scientific Reserve (administered by the Department of Conservation)
- a reserve at the northern end of the Omaha Spit (administered by Auckland Council).
The Omaha Sequence biodiversity focus area includes:
- one of the largest and most important swamp forest remnants in Tāmaki Makaurau / Auckland
- an extensive saltmarsh area in the Whangateau Harbour south of the Omaha causeway which grades into freshwater wetland and stormwater ponds
- sand dunes at the northern end of Omaha Spit including important shorebird and wading bird habitat
- pōhutukawa treeland on the cliffs at the southern end of Omaha Beach.
The intact vegetation sequence from mangrove to saltmarsh (SA1) to mānuka-dominated freshwater wetland (WL12) to swamp forest (WF8) is now rare in Tāmaki Makaurau.
The swamp forest is densely covered in native vegetation and includes a diverse range of native plant species. Mature kahikatea are the dominant tree species. Pukatea, cabbage tree, lancewood and nikau are common along with occasional rimu, taraire and pūriri. Mapere, swamp coprosma and kiekie are common beneath the canopy, along with hangehange growing in drier areas.
There is a fringe of mānuka fen (WL12) along the estuarine edge of the swamp forest.
The swamp forest, mānuka fen and saltmarsh support populations of:
- several threatened plants
- mioweka (banded rail)
- mātātā (fernbird).
The intertidal sand flats and sand dunes at the northern end of the spit provide rich feeding grounds and roosting and nesting habitat for a large number of resident and migratory shorebird species. Species found here include:
- tūturiwhatu (New Zealand dotterel)
- tōrea (South Island pied oystercatcher)
- tōrea pango (variable oystercatcher)
- kuaka (bar-tailed godwit)
- ngutuparore (wrybill)
- pohowera (banded dotterel)
- taranui (Caspian tern)
- tara iti (fairy tern).
At the southern end of Omaha, pāteke (brown teal) and other native waterfowl utilise the stormwater ponds and freshwater wetlands.
The Omaha Shorebird Protection Trust work to protect the shorebirds and their habitat at Omaha Spit. A growing proportion of the local community are involved in animal pest management for the benefit of native species throughout Omaha.
Active coastal sand dunes ecosystem
Spinifex, pīngao grassland or sedgeland ecosystem (DN2)
Dunelands occur where erosion and accretion of sand creates mobile dune systems. Due to the extreme conditions only a few highly specialised, drought tolerant plant species have adapted.
Coastal saline ecosystem
Mangrove forest and scrub ecosystem (SA1)
Mangrove forest and scrub is found in tidal estuaries, inlets and where salt water meets fresh at the mouths of rivers and streams. This ecosystem has a range of distinct plant communities that provide habitat for birds and fish.
Warm forest ecosystem
Kahikatea, pukatea forest ecosystem (WF8)
Swamp forests occur on wet soils along the coastal margins in areas that are frost free. A critically endangered ecosystem, it now exists in only a small number of areas in Auckland.