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CGMFC-21 - Continuous Global Mangrove Forest Cover for the 21st Century

Key indicator facts

Indicator type

State

Applicable for national use

Yes (find out more)

Indicator classification

Operational and included in the CBD's list of indicators

Indicator type

State

Applicable for national use

Yes (find out more)

Indicator classification

Operational and included in the CBD's list of indicators

Last update

2018

Coverage

Global

Availability

Freely available

Partners

Salisburyunilogo

Salisbury University

Contact point

Stuart E. Hamilton - stuartehamilton@gmail.com

Indicator description

CGMFC-21 was developed to allow for high-resolution global mangrove loss trends to be extracted on an annual basis. This need has been identified by the mangrove community for some time with the only other global mangrove database (non-temporal) representing data from the late 1990s. The indicator measures mangrove forest cover on many differing scales. It addresses policy questions related to mangrove cover and is a component of addressing wider forest trends.

Related Aichi Targets

Primary target

5

Target 5:

By 2020, the rate of loss of all natural habitats, including forests, is at least halved and where feasible brought close to zero, and degradation and fragmentation is significantly reduced.

Primary target

5

Target 5:

By 2020, the rate of loss of all natural habitats, including forests, is at least halved and where feasible brought close to zero, and degradation and fragmentation is significantly reduced.

5

Themes

Marine

Marine & freshwater habitats

View related indicators >
Marine

Partners

Salisburyunilogo

Key indicator facts

Indicator type

State

Applicable for national use

Yes (find out more)

Indicator classification

Operational and included in the CBD's list of indicators

Indicator type

State

Applicable for national use

Yes (find out more)

Indicator classification

Operational and included in the CBD's list of indicators

Last update

2018

Coverage

Global

Availability

Freely available

Indicator description

CGMFC-21 was developed to allow for high-resolution global mangrove loss trends to be extracted on an annual basis. This need has been identified by the mangrove community for some time with the only other global mangrove database (non-temporal) representing data from the late 1990s. The indicator measures mangrove forest cover on many differing scales. It addresses policy questions related to mangrove cover and is a component of addressing wider forest trends.

Contact point

Stuart E. Hamilton - stuartehamilton@gmail.com

Graphs / Diagrams

Figure: Global Mangrove Canopy Cover in km2 from 2000 to 2012 with interpolation from 2012 to 2014.

Although global mangrove cover is relatively stable (declines of less than 1% per year) the national pattern can be quite different with major losses in some SE Asian countries.

Current storyline

CGMFC-21 addresses a need for rapid assessment of global mangrove forest cover. The data can be utilized globally, continentally, nationally, sub-nationally, and even down to scales of individual municipalities or aggregated regional study sites. It measures the level of mangrove cover likely present at a highly granular scale. It answers policy questions related to the conservation of pre-existing mangrove forests, the likely expansion of new forests, and gives insights into the potential fragmentation and degradation of mangrove sites. The annual measure allows for rapid assessment of the state of mangrove forests at sites of concern and allows scientists to investigate sites depicting rapid or substantial loss to obtain a clearer picture of the status on the ground.

It is critical that mangrove forest loss is reduced to close to zero. Indeed, mangrove forest recovery may be needed to realistically reach a sustainable level of global cover. The dataset sheds light on Aichi target 5 that aims to reduce forest losses by over half by 2020 and get the rate close to zero. Equally important the dataset can assist in monitoring the fragmentation and degradation of forests almost explicity for Aichi Target 5.

Data and methodology

Coverage: Global, all mangrove holding nations

Scale: Global data; aggregated from pixel level remotely sensed data

Time series available: 2000-2014 (every 3-5 years)

Next planned update: 2020

Possible disaggregations: Anything larger than 1km2 including all provinces, municipalities, parks, regions, countries or states.

Metadata used: ISO 19115

Methodology: We synthesized the Global Forest Change database, the Terrestrial Ecosystems of the World database and the Mangrove Forests of the World database to extract mangrove forest cover at high spatial and temporal resolutions. We then used the new database to monitor mangrove cover at the global, national and protected area scales. Full methodology is provided in the open access paper (http://dx.doi.org/10.1111/geb.12449).


National use of indicator

Producing this indicator nationally: You need a GIS file of the country. Then you extract the year of interest from the database using the country GIS file. ArcGIS, QGIS, GRASS, and GDAL all have this capability.

Use of the global method and data at the national level:

Every mangrove holding country has data for every year enabling national level calculations of this indicator. The indicator methodology can be applied with in-country data to develop a national indicator.

Examples of national use:

  1. Phillipines 1
  2. Phillipines 2
  3. China 1
  4. China 2
  5. Vietnam
  6. India
  7. Indonesia and Malaysia
  8. Cameroon
  9. Colombia
  10. Solomon Islands

Contact person for supporting national use: Stuart E. Hamilton - stuartehamilton@gmail.com

Further resources

Key indicator facts

Indicator type

State

Applicable for national use

Yes (find out more)

Indicator classification

Operational and included in the CBD's list of indicators

Indicator type

State

Applicable for national use

Yes (find out more)

Indicator classification

Operational and included in the CBD's list of indicators

Last update

2018

Coverage

Global

Availability

Freely available

Partners

Salisburyunilogo

Salisbury University

Contact point

Stuart E. Hamilton - stuartehamilton@gmail.com