Long Bay – Okura Marine Reserve
Download Department of Conservation brochure [1.63 MB PDF]
Auckland City Council Monitoring Programme
Download Assessment of the Estuarine Ecological Monitoring Programme to 2012 [1.1 MB PDF]
The former Auckland Regional Council began monitoring the Okura Estuary in 2000.
More trends over time consistent with increased sedimentation were detected in Okura … suggesting it is most likely to be exhibiting long-term changes related to increased terrestrial sedimentation.
Data from 2000 – 2013
A report published by the Council in 2015 has data from sampling sites in the Okura Estuary, many of which indicate decreasing marine organisms. This data is from the period before logging was completed in the Weiti Forest watershed.
Download Auckland East Coast Estuarine Monitoring Programme: Report on data collected 2000 to October 2013 [8.41 MB PDF]
Ecological trends consistent with increased sedimentation were detected at five sites (sites 1, 2, 4, and 9 (see Table 4 – 1).
Decreasing trends were detected for CAPmud at sites 2, 4 and 9 (Figure 4-3, Figure 4-4).
At site 2, a possible decreasing trend in abundance was also detected for large sized Macomona bivalves.
At site 4, a decreasing trend in abundance was also detected for the crustacean, Colurostylis.
At site 9, decreases in the number of taxa and the abundance of Colurostylis were detected, along with a possible decrease in the total abundance of the cockle, Austrovenus.
At site 1, decreases in the abundance of the anemone, Anthopleura, the polychaete, Aonides, and large sized Austrovenus were detected.
A possible decrease in the total abundance of Austrovenus was also detected.
LAWA – Land Air Water Aotearoa water quality data
The catchment is 550 hectares in size, with predominantly rural landuse. Data for this site has been collected since 2003.
E.coli, Turbidity and Ammoniacal Nitrogen are in the worst 25% of similar sites.