Why wetlands are important

Flood control

Wetlands absorb water during heavy rain, releasing water gradually so flooding is reduced. Downstream water flows and ground water levels are also maintained during periods of low rainfall. Wetlands help stabilise shorelines and riverbanks.

Water quality

As water moves into a wetland, the flow rate decreases, allowing particles to settle out. Plant surfaces provide for filtration, absorption of solids and add oxygen to the water. Growing plants remove nutrients. This cleansing role of wetlands protects downstream environments.

Recreation

Wetlands offer a wide variety of recreation activities including boating, fishing, swimming, bird watching, whitebaiting and hunting.

Tourism and education

Wetlands are attractive to visitors because of the large numbers and diversity of species they support. The popularity of wetlands is demonstrated by visitor numbers at the Sinclair Wetland near Dunedin and the Miranda Shorebird Centre at the Firth of Thames. Wetlands also offer many interesting education opportunities and the Department has produced a number of education kits for various wetlands.

Exceptional habitats

A huge range of plants and animals inhabit wetlands. Wetland plants include 47 species of rush and 72 species of native sedge. Many of these plants have very specific environmental needs and are extremely vulnerable to change. A number of New Zealand’s endangered plant species depend totally on wetlands.

Wetlands support the greatest concentrations of bird life of any habitat in New Zealand and support far more species that a comparable forest area. Migratory species depend on chains of suitable wetlands. The survival of threatened species such as the Australasian bittern, brown teal, fernbird, marsh crake and white heron relies on New Zealand’s remnant wetlands.

Native fish need wetlands too. Eight of New Zealand’s 27 species including inanga, short-finned eels, kokopu and bullies are found in wetlands while the whitebait fishery depends on the spawning habitat offered by freshwater wetlands. The best whitebait runs are found on the West Coast of the South Island where extensive areas of forest and swamp remain. The decline in native fish populations is directly related to massive reductions in freshwater habitat.

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