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Home > Our region and environment > Coast > Ohiwa Harbour > Case study - Upokorehe get 'hands on' with mangroves

Case study - Upokorehe get 'hands on' with mangroves

Upokorehe get 'hands on' with mangroves

The Upokorehe hapu gained resource consent in 2011 to remove outlying mangrove plants and seedlings from the Ohiwa Harbour.
Upokorehe spokesperson Maui Manuel said: "The work can be challenging in the heat and soft mud, so our team would very hard for several hours, and then have a great social time and barbeque."

Upokorehe is the only group in the Ohiwa Harbour to have a resource consent (a permit from the Regional Council) to remove mangroves. Through the recent 'hands on' experience, the group is now expert in how best to do this work. An important feature of the mangrove removal project is recognition of the value of mangrove habitat (particularly for the rare banded rail bird), so not all mangroves can be removed. Instead, there are defined areas where removal is desirable. The muddy mangrove habitat is generally less rich in desirable bird and shellfish species than the sandy substrate areas of the Harbour.

Considerable research was carried out into the ecology and spread of the mangroves. In recent years, mangrove populations have increased enormously and scientists agree that if left unchecked, mangroves could potentially cover a large proportion of the harbour. Click here for more information about the sediment and mangrove plan

Mangrove removal will help fine mud particles flush out of the Harbour, leaving coarser material. This provides a better home for the native worms and invertebrates that wading birds and fish live on, and for pipi and cockles. Photo points were established at each removal site.  These photos, taken before and after each working bee, provide a visual record of changes over time.

The project is an example of iwi exercising their kaitiakitanga of the Harbour by leading action that benefits the Harbour.

Removing mangroves outside the conditions of the resource consent is not allowed. However, if you are keen to help out with this work, please contact Tim Senior at the Bay of Plenty Regional Council at 0800 884 881, ext 6010.