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intertidal subtidal sandflats mudlfats marine estuarine coastal benthic soft chemistry core

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  • Chemical monitoring of sediments in estuaries within the Northland region for Northland Regional Council. Sampling sites are located in the Whangarei Harbour and Bay of Islands, and include tidal creeks, mid-channel and open water locations. Sampling frequency = 2yearly (autumn). Sampling began in 2010 and is ongoing (at 2-yearly intervals). Number of sites = 32 total. Extent of site = 1800m2 (60m x 30m). Number of replicates = 5 per site. Measured variables = Sediment characteristics (grain size, TOC, TP, nitrogen, lead, zinc and copper). Sampling protocol & QA = Internal protocol and QA procedures. Sediment analysis external (Malvern Particle Analyser).