Rtuffli: SIGNAL publish from draft v157

2026-05-30T18:55:23Z

SIGNAL publish from draft v157

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{| class="wikitable" style="float:right; clear:right; margin:0 0 1em 1em; width:320px;"
|+ SIGNAL Earth Structured Data
|-
! Object type
| Damage Signal
|-
! SIGNAL Earth ID
| DS-00120
|-
! Observable type
| Mangrove area extent
|-
! Unit
| ha (ha)
|-
! Temporal structure
| Annual
|-
! Monitoring backbone
| —
|}


{{SignalTerm|type=DS|id=DS-00120|label=Mangrove Area Extent}} refers to the total surface area covered by mangrove forests globally, measured in hectares. Mangroves are coastal ecosystems characterized by salt-tolerant trees and shrubs that thrive in intertidal zones of tropical and subtropical regions. These ecosystems provide critical habitat for diverse species, protect shorelines from erosion, and contribute to carbon sequestration.

The extent of mangrove forests is an important environmental indicator reflecting the health and stability of coastal zones. Changes in mangrove area can indicate ecosystem degradation or recovery, influenced by natural processes and human activities such as land use change, coastal development, and climate impacts.

Monitoring mangrove area extent supports understanding of coastal ecosystem dynamics and informs conservation and management efforts. It also contributes to assessments of biodiversity, carbon storage, and coastal resilience within broader environmental frameworks.

== Geographic / System Context ==
Mangrove forests are distributed primarily along tropical and subtropical coastlines worldwide, including regions in Southeast Asia, Africa, the Americas, and Australia. These ecosystems occupy intertidal zones where saline or brackish water conditions prevail, often forming dense forests along estuaries, lagoons, and river deltas. The geographic scope of mangrove area extent is global, encompassing diverse coastal environments where mangroves establish and persist. The spatial distribution of mangroves is influenced by tidal regimes, sediment availability, salinity gradients, and climatic factors.

== Monitoring and Measurement ==
Mangrove area extent is typically monitored through remote sensing technologies such as satellite imagery and aerial photography, which allow for repeated, large-scale observations of coastal zones. Multispectral and radar sensors enable differentiation of mangrove vegetation from other land cover types. Ground-based surveys and ecological field assessments complement remote sensing data by validating species composition and forest structure. Scientific institutions and environmental agencies employ standardized protocols to map and quantify mangrove coverage, facilitating temporal analyses and trend detection.

Within the SIGNAL system, this phenomenon is treated as a defined environmental signal whose boundaries and measurement conventions are described below.

== Signal Definition ==
The {{SignalTerm|type=DS|id=DS-00120|label=Mangrove area extent}} signal represents the total area of mangrove forest cover measured annually in hectares. It quantifies the spatial extent of mangrove ecosystems within coastal environments, reflecting their state condition as a component of the coastal domain. This signal captures changes in mangrove coverage over time, indicating gains, losses, or stability in forest area.

== Boundary Conditions ==
Boundary inclusions encompass all naturally occurring and established mangrove vegetation within intertidal coastal zones, including mature forests and regenerating stands. The measurement excludes non-mangrove coastal vegetation such as salt marshes, seagrass beds, and terrestrial forests beyond the influence of tidal saline waters. Artificial plantations or mangrove areas under active restoration may be included if they meet ecological criteria for mangrove classification. Areas subject to temporary tidal inundation but lacking persistent mangrove vegetation are excluded.

== Aggregation Semantics ==
Geographic aggregation of mangrove area extent is conducted at multiple scales, from local coastal units to national and global levels, enabling spatial analysis of distribution patterns and regional trends. Temporal aggregation follows an annual cycle, aligning with seasonal growth and disturbance dynamics in mangrove ecosystems. Cross-signal aggregation involves integrating mangrove area extent data with related environmental signals such as biodiversity indices and coastal erosion metrics to provide comprehensive assessments of coastal ecosystem health and function. Aggregation notes specify that consistent spatial resolution and classification criteria are essential for reliable temporal and cross-signal comparisons.

== Observational Status ==
Monitoring of mangrove area extent is ongoing, with data derived primarily from satellite remote sensing platforms complemented by field validation. Current datasets provide baseline and trend information at global and regional scales, although methodological harmonization and increased temporal resolution remain areas for development. Future SIGNAL releases may incorporate enhanced spatial detail, integration with stressor data, and improved linkage with related coastal environmental signals to support more nuanced understanding of mangrove ecosystem dynamics.

== Related Signals ==
* Biodiversity intactness index
* Coastal erosion extent
* Coastal litter accumulation density
* Marine fish biomass stock (declared species group)
* Marine plastic concentration
* Significant wave height


== Key Associated People ==
* '''Daniel Friess''' — Contributor (National University of Singapore) [Domain expert]



== Sources ==
* [https://conbio.onlinelibrary.wiley.com/ The state of the world’s mangrove forests: past, present, and future — 2019 — Conservation Letters]

Mangrove Area Extent - Revision history

Rtuffli: SIGNAL publish from draft v157