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Description: Mangroves are the dominant vegetation in sheltered estuarine intertidal areas in northern New Zealand. New Zealand mangroves (Avicennia marina), or mānawa, are found in the upper and mid-North Island, south to Ohiwa on the east coast, and Kawhia/Aotea Harbours on the west coast. These trees form a key biogenic habitat providing structure and resources for both terrestrial and marine species and they provide important services to combat storm surges and sea level rise through slowing water flow to trap, stabilize and bind marine sediments and pollutants. Mangroves provide essential habitat for many threatened or at-risk bird species. Most of New Zealand’s estuaries have been altered or lost through development activities, though increased rates of sedimentation can increase the spread of mangroves, as observed in some areas. This map shows mangroves mapped in over 2,000 sites around the North Island where they occur. This map contains data from the most recent file on the Department of Conservation’s (DOC) SeaSketch project collated in collaboration with regional councils, containing data updated in 2018 and is the most comprehensive dataset for New Zealand.<div><br /></div><div>Though this includes some of the most comprehensive national-scale data, there are limitations where existing data are not yet included and, in some cases, spatial extent, and seagrass density are not assessed. Changes over time also need to be monitored. Additional aerial imagery tools could assist with filling these gaps.</div><div><br /></div><div>Department of Conservation (2018). Seagrass and mangrove extent: Our estuaries (doc.govt.nz)</div><div><br /></div><div>Seagrass and mangrove extent: Our estuaries (doc.govt.nz); https://data.waikatoregion.govt.nz:8443/ords/f?p=140:12:0::NO::P12_METADATA_ID:1036</div>

Copyright Text: Department of Conservation - Te Papa Atawhai, Waikato Regional Council

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Last Edit Date: 5/7/2025 9:44:41 PM

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