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A Global Rebound for Mangroves

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Briefings

A global mangrove rebound began around 2010, driven by expansion in Asia, Australia, and South America. Scientists analyzed Landsat data from 1984 to 2023, finding a net loss of 3,000 square kilometers between 1984 and 2010, followed by a 2,000 square kilometer increase after 2010. This reversal was particularly notable in Southeast Asia, where post-2004 tsunami restoration efforts and sedimentation enabled new colonization. While some regions like the Niger Delta saw continued losses, the overall trend shifted toward recovery, with mangroves now occupying new areas and denser canopies in South America. The study highlights that conservation efforts combined with natural expansion can drive significant ecological recovery.

Key points

• Scientists analyzed Landsat imagery from 1984 to 2023 to track mangrove changes, identifying a net loss of 3,000 square kilometers between 1984 and 2010.
• Following a 2010 rebound, mangrove area increased by 2,000 square kilometers, with expansion in Asia, Australia, and South America being the primary drivers.

Context

This study represents the first global mangrove maps covering a long period, revealing a reversal from decades of decline to a global expansion. The findings are based on Landsat data from the U.S. Geological Survey and are supported by research from Tulane University and IUCN.

Limitations

The analysis relies on Landsat imagery with specific capture dates (February 2010 and February 2026) and covers only 1984-2023. Some regions like the Niger Delta and North America experienced losses, and the study does not account for all factors influencing mangrove dynamics.

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