Lake submerged plant index, 1991 - 2019

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Creative Commons Attribution 4.0 International

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213
0
Added
06 Apr 2020

This dataset was first added to MfE Data Service on 06 Apr 2020.

The most recent assessment of ecological condition of 295 lakes in New Zealand assessed on at least one occasion between 1991 and 2019 was measured using the lake submerged plant index (LakeSPI).

More information on this dataset and how it relates to our environmental reporting indicators and topics can be found in the attached data quality pdf.

Table ID 104564
Data type Table
Row count 295
Services Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed

Modelled lake water quality, 2013-2017

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Creative Commons Attribution 4.0 International

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200
2
Added
06 Apr 2020

This dataset was first added to MfE Data Service on 06 Apr 2020.

This indicator reports on six measures of lake water quality based on spatially modelled data for:

  • chlorophyll-a
  • total nitrogen
  • ammoniacal nitrogen
  • total phosphorus
  • water clarity
  • trophic level index (TLI3).

For these measures we report on:

  • modelled median values for the period 2013–17
  • for selected measures, how these values compare to the National Objectives Framework (NOF) bands related to ecosystem health (MfE, 2017).

This indicator includes spatial predictions for 3,802 of 3,820 lakes in New Zealand (majority of New Zealand lakes that are larger than 1 hectare), based on measurements at 61–104 lake sites (the number of sites differs by measure).

More information on this dataset and how it relates to our environmental reporting indicators and topics can be found in the attached data quality pdf.

Table ID 104560
Data type Table
Row count 30416
Services Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed

Lake Submerged Plant Index, 1991–2016

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Creative Commons Attribution-NonCommercial 4.0 International

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You must attribute the creator in your own works.

3392
21
Added
25 Apr 2017

This dataset was first added to MfE Data Service on 25 Apr 2017.

Submerged plants are good indicators of the ecological quality of lakes. Because they are attached to the bed of lakes, submerged plants are easy to observe and identify, and they are unable to move away from environmental changes. The plant species found within lakes can tell us about their level of habitat degradation and exotic weed invasion.

The file contains Lake submerged plant index scores for each sampling occasion.

Table ID 53606
Data type Table
Row count 248
Services Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed

Lake water quality state 2013–2017

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Creative Commons Attribution 4.0 International

You may use this work for commercial purposes.

You must attribute the creator in your own works.

2197
13
Added
16 Apr 2019

This dataset was first added to MfE Data Service on 16 Apr 2019.

This dataset contains ten lake water quality variables based on measurements made at monitored lake sites: chlorophyll-a, nitrate-nitrogen, total nitrogen, ammoniacal nitrogen, dissolved reactive phosphorus, total phosphorus, Escherichia coli, water clarity, and lake trophic level index (TLI3 and TLI4). This dataset includes: - Median values for the period 2013 to 2017 - For selected indicators, how these values compare to the National Objectives Framework (NOF) (MfE, 2017) bands related to ecosystem health When nitrogen and phosphorus accumulate above certain concentrations in lakes (referred to as ‘nutrient enrichment’), they can stimulate excessive growth of algae and cyanobacteria. Chlorophyll-a is a measure of the phytoplankton (algae) biomass. The lake trophic level index (TLI) indicates the health of a lake based on concentrations of three variables:
· total nitrogen
· total phosphorus
· chlorophyll-a.
Water clarity is a measure of underwater visibility. Lakes with poor clarity and TLI are poor habitats for some species of animals and plants, and they may not be suitable for recreation. Ammoniacal nitrogen can be toxic to aquatic life if concentrations are high enough.

More information on this dataset and how it relates to our environmental reporting indicators and topics can be found in the attached data quality pdf.

Summary report available at: www.mfe.govt.nz/publications/fresh-water/water-qua....

Table ID 99872
Data type Table
Row count 454
Services Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed

Lake water quality trends 2008–2017 1998–2017 and 1990–2017

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Creative Commons Attribution 4.0 International

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You must attribute the creator in your own works.

2033
11
Added
16 Apr 2019

This dataset was first added to MfE Data Service on 16 Apr 2019.

This dataset contains ten lake water quality variables based on measurements made at monitored lake sites: chlorophyll-a, nitrate-nitrogen, total nitrogen, ammoniacal nitrogen, dissolved reactive phosphorus, total phosphorus, Escherichia coli, water clarity, and lake trophic level index (TLI3 and TLI4). This dataset includes: - Median values for the period 2013 to 2017 - For selected indicators, how these values compare to the National Objectives Framework (NOF) (MfE, 2017) bands related to ecosystem health When nitrogen and phosphorus accumulate above certain concentrations in lakes (referred to as ‘nutrient enrichment’), they can stimulate excessive growth of algae and cyanobacteria. Chlorophyll-a is a measure of the phytoplankton (algae) biomass. The lake trophic level index (TLI) indicates the health of a lake based on concentrations of three variables:
· total nitrogen
· total phosphorus
· chlorophyll-a.

Water clarity is a measure of underwater visibility. Lakes with poor clarity and TLI are poor habitats for some species of animals and plants, and they may not be suitable for recreation. Ammoniacal nitrogen can be toxic to aquatic life if concentrations are high enough.

More information on this dataset and how it relates to our environmental reporting indicators and topics can be found in the attached data quality pdf.

Summary report available at: www.mfe.govt.nz/publications/fresh-water/water-qua...

Table ID 99873
Data type Table
Row count 609
Services Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed

Lake water quality trends data quality

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Creative Commons Attribution 4.0 International

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You must attribute the creator in your own works.

135
7
Added
16 Apr 2019

This item was first added to MfE Data Service on 16 Apr 2019

3
Document ID21934
File namelake-water-quality-trends-data-quality.pdf
TypePDF
Size517 KB

Lake water quality 28 year trends raw data

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Creative Commons Attribution 4.0 International

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109
9
Added
16 Apr 2019

This item was first added to MfE Data Service on 16 Apr 2019

Document ID21933
File namelake-water-quality-28-year-trends-raw-data.csv
TypeCSV
Size23.8 KB

Lake water quality 20 year trends raw data

Licence

Creative Commons Attribution 4.0 International

You may use this work for commercial purposes.

You must attribute the creator in your own works.

87
0
Added
16 Apr 2019

This item was first added to MfE Data Service on 16 Apr 2019

Document ID21932
File namelake-water-quality-20-year-trends-raw-data.csv
TypeCSV
Size47.4 KB

Lake water quality 10 year trends raw data

Licence

Creative Commons Attribution 4.0 International

You may use this work for commercial purposes.

You must attribute the creator in your own works.

111
12
Added
16 Apr 2019

This item was first added to MfE Data Service on 16 Apr 2019

Document ID21931
File namelake-water-quality-10-year-trends-raw-data.csv
TypeCSV
Size167 KB

Lake water quality 28 year trends, raw data

Licence

Creative Commons Attribution 4.0 International

You may use this work for commercial purposes.

You must attribute the creator in your own works.

81
0
Added
16 Apr 2019

This item was first added to MfE Data Service on 16 Apr 2019

Document ID21930
File namelake-water-quality-28-year-trends-raw-data.csv
TypeCSV
Size23.8 KB
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