Coastal and estaurine water quality, state, 2016-2020

23 Nov 2022

This dataset was first added to MfE Data Service on 23 Nov 2022.

This data set reports on state for the period 2016 to 2020.

Coastal and estuarine ecosystems are affected by changes in water quality.

The two main nutrients of concern in coastal and estuarine ecosystems are nitrogen and, to a lesser degree, phosphorus. An overload of nutrients (eutrophication) can lead to algal blooms that can kill marine life by depleting oxygen levels. Some bloom-forming algal species also contain toxins that can harm marine life, and can pass through food chains to humans (for example, via shellfish poisoning).

Abundant Enterococci _and faecal coliform bacteria indicate the possible presence of human faecal pathogens in coastal waters and represent the risk of infectious disease. Chlorophyll-_a is a measure of phytoplankton biomass and is a primary indicator of eutrophication.

High suspended sediment concentrations are associated with estuarine and coastal sedimentation, reduced light levels in benthic (seabed) environments, and reduced feeding rates and health of estuarine and coastal animals (Lowe et al., 2015). Visual clarity and turbidity are monitored because light affects primary production, plant and animal distributions and ecological health, aesthetic quality, and recreational values (Davies-Colley et al., 2003).

Dissolved oxygen is fundamental to supporting marine life. Low levels of dissolved oxygen can have adverse effects on aquatic fauna, from reduced growth rates to death from lack of oxygen (Tomasetti & Gobler, 2020). Decreased pH results from the absorption of CO2 from the atmosphere by seawater but can also reflect local processes caused by eutrophication (Cai et al., 2011; Fraser et al., 2021). Changes in the pH of seawater can have harmful effects on marine life, impacting chemical communication, reproduction, and growth. The building of skeletons in marine organisms is particularly sensitive to acidity, so acidification (lower pH) of sea waters can be harmful for organisms such as shellfish and corals (Fabry et al., 2008). Salinity provides information on the freshwater content of coastal waters. Water temperature is important as it controls biochemical processes and affects the balance of parameters such as dissolved oxygen levels. As a result, seawater temperature determines distributions of many marine plants and animals (Kleisner et al., 2017).

Adapted by Ministry for the Environment and Statistics New Zealand to provide for environmental reporting transparency. Dataset used to develop the "Coastal and estuarine water quality, trends" indicator (available at Coastal and estuarine water quality | Stats NZ).

1. CEWQ state PDF.pdf 195 KB pdf
Regions New Zealand
Metadata ISO 19115/19139, Dublin Core
Technical Details
Layer ID 111138
Data type Vector point
Feature count 24467
Attributes site, eti_class, eti_class_name, attribute, attribute_name, measurement, value, units, lat, long, period, n_leftcensored, n_rightcensored, dl, al, imputed_lower, imputed_upper, n_values, n_month, n_qtr, n_years, filter_ok, incl_ineq
Services Vector Query API, Web Feature Service (WFS), Catalog Service (CS-W), Atom Feed
Added 23 Nov 2022
Revisions 2 - Browse all revisions
Current revision Imported on Nov. 23, 2022 from Geodatabase in WGS 84.


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