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ArticleUncovering Dynamics of Global Mangrove Gains and Losses 2023
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No results found.Supporting successful global mangrove conservation and policy requires accurate identification of anthropogenic and biophysical drivers of mangrove extent, yet such studies are scarce. We apply a hybrid methodology, combining existing remote sensing mangrove maps with local expert knowledge of vegetation and land use dynamics. We conducted stratified random sampling in eight subregions, and local experts visually interpreted over 20,900 plots using high-resolution imagery in Collect Earth Online. Similar to previous estimates, we found 147,771 km2 (±1.4%) of mangroves globally in 2020 and that rates of mangrove loss have decreased from 2000–2010 to 2010–2020, largely driven by South and Southeast Asia. Anthropogenic drivers of loss have shifted across subregions, with oil palm cultivation emerging in South and Southeast Asia and aquaculture in South America and Western and Central Africa, highlighting the need for ongoing monitoring and adaptable conservation efforts. Natural expansion outpaced natural retraction in both periods. This is the first global study uncovering land use drivers of mangrove decline and recovery, only made possible by collaboration with local experts. Key breakthroughs include successfully discerning spectrally similar anthropogenic from biophysical drivers, such as aquaculture from natural retraction, and creating data collection approaches that streamline visual interpretation efforts. -
Book (stand-alone)How much do large-scale and small-scale farming contribute to global deforestation?
Results from a remote sensing pilot approach
2023Also available in:
No results found.The study presented in this document expands on the work conducted during the Global Forest Resources Assessment (FRA) 2020 Remote Sensing Survey (RSS) and revisits the extensive dataset of areas where deforestation occurred over periods 2000–2010 and 2010–2018 to subclassify and assess deforestation drivers. Notably, considering the importance it would have in designing appropriate strategies for halting deforestation, the study assesses the share of agriculture-driven deforestation linked to small-scale and large-scale farming, both for cropping and livestock systems. The goal was not only to further characterize the global deforestation drivers in 2000–2018 but also to identify methods and tools that can help in exploring the deforestation drivers using Earth Observation – by adding more options to the original FRA RSS query and by trying to define subjective characteristics of the activities. -
Book (stand-alone)A review of mangrove and seagrass ecosystems and their linkage to fisheries and fisheries management 2013
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No results found.Mangrove and seagrass ecosystems are widespread coastal and estuarine environments found in tropical and subtropical latitudes. These ecosystems provide habitat, shelter and food for numerous organisms, including some species that support important nearshore fisheries. Over the past 50 years, approximately 30 percent of global mangrove cover and 30 percent of seagrass areas have been lost. Much of this loss has occurred in the Asian region. These declines are cause for concern because mangroves and seagrasses have long been considered important habitats for coastal fisheries. This publication sets out to analyze the relationship between fisheries production and mangrove and seagrass habitats. Conclusions as well as recommendations for further study are included in the report.
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