Coastal and estaurine water quality, state, 2016-2020

210
2
Added
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.

Nutrients
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).

Microbiological
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.

Optical
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).

Physico-chemical
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).

Layer ID 111138
Data type Vector point
Feature count 24467
Services Vector Query API, Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed

CEWQ state PDF.pdf

37
3
Updated
24 Nov 2022

This item was last updated on MfE Data Service on 24 Nov 2022

3
Document ID24393
File namecewq-state-pdfpdf.pdf
TypePDF
Size195 KB

cewq_trends_dqr.pdf

60
1
Updated
23 Nov 2022

This item was last updated on MfE Data Service on 23 Nov 2022

5
Document ID24390
File namecewq_trends_dqrpdf.pdf
TypePDF
Size223 KB

CEWQ state PDF.pdf

53
1
Updated
23 Nov 2022

This item was last updated on MfE Data Service on 23 Nov 2022

3
Document ID24389
File namecewq-state-pdfpdf.pdf
TypePDF
Size195 KB

Coastal and estuarine water quality, trends, 2006-2020

185
4
Added
23 Nov 2022

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

This data set reports on trends for 15 coastal and estuarine water quality measures, grouped below by type, monitored at sites across Aotearoa New Zealand between 2006 and 2020:

  • nutrient – ammoniacal nitrogen, nitrate-nitrite nitrogen, total nitrogen (unfiltered), dissolved reactive phosphorus, and total phosphorus (unfiltered)
  • microbiological – faecal coliforms, Enterococci, and chlorophyll-a
  • optical – visual clarity, turbidity, and suspended solids (inorganic and organic)
  • physico-chemical – dissolved oxygen, pH, salinity, and temperature.

We present trends for the period 2011 to 2020.

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

Nutrients
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).

Microbiological
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.

Optical
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).

Physico-chemical
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++).

Layer ID 111131
Data type Vector point
Feature count 3024
Services Vector Query API, Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed

cslr_trends_dqr.pdf

35
1
Updated
02 Nov 2022

This item was last updated on MfE Data Service on 02 Nov 2022

5
Document ID24384
File namecslr_trends_dqrpdf.pdf
TypePDF
Size225 KB

cslr_state_dqr.pdf

60
1
Updated
02 Nov 2022

This item was last updated on MfE Data Service on 02 Nov 2022

5
Document ID24383
File namecslr_state_dqrpdf.pdf
TypePDF
Size222 KB

cewq_trends_dqr.pdf

32
1
Updated
02 Nov 2022

This item was last updated on MfE Data Service on 02 Nov 2022

5
Document ID24382
File namecewq_trends_dqrpdf.pdf
TypePDF
Size223 KB

cewq_state_dqr.pdf

42
1
Updated
02 Nov 2022

This item was last updated on MfE Data Service on 02 Nov 2022

3
Document ID24381
File namecewq_state_dqrpdf.pdf
TypePDF
Size195 KB

Lake_water_quality_trends_dqr.pdf

80
11
Updated
25 Aug 2022

This item was last updated on MfE Data Service on 25 Aug 2022

4
Document ID24209
File namelake_water_quality_trends_dqrpdf.pdf
TypePDF
Size187 KB
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