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The global distribution and trajectory of tidal flats

Nature (London), 2019-01, Vol.565 (7738), p.222-225 [Peer Reviewed Journal]

COPYRIGHT 2019 Nature Publishing Group ;COPYRIGHT 2019 Nature Publishing Group ;Copyright Nature Publishing Group Jan 10, 2019 ;ISSN: 0028-0836 ;EISSN: 1476-4687 ;DOI: 10.1038/s41586-018-0805-8 ;PMID: 30568300

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Title:
The global distribution and trajectory of tidal flats
Author: Murray, Nicholas J ; Phinn, Stuart R ; DeWitt, Michael ; Ferrari, Renata ; Johnston, Renee ; Lyons, Mitchell B ; Clinton, Nicholas ; Thau, David ; Fuller, Richard A
Subjects: Accuracy ; Coastal ecosystems ; Coastal erosion ; Coastal marshes ; Coasts ; Confidence intervals ; Coral reefs ; Datasets ; Distribution ; Ecosystems ; Environmental aspects ; Environmental changes ; Environmental degradation ; Erosion ; Fluvial sediments ; Forecasts and trends ; Forest ecosystems ; Geology ; Handbooks ; Human populations ; Intertidal areas ; Intertidal zone ; Mapping ; Marine ecosystems ; Methods ; Mud ; Mud flats ; Reefs ; Salt marshes ; Satellite imagery ; Sea level rise ; Sediments ; Spatial discrimination ; Surface water ; Tidal flats ; Tidal marshes ; Trajectories ; Waterfront development
Is Part Of: Nature (London), 2019-01, Vol.565 (7738), p.222-225
Description: Increasing human populations around the global coastline have caused extensive loss, degradation and fragmentation of coastal ecosystems, threatening the delivery of important ecosystem services . As a result, alarming losses of mangrove, coral reef, seagrass, kelp forest and coastal marsh ecosystems have occurred . However, owing to the difficulty of mapping intertidal areas globally, the distribution and status of tidal flats-one of the most extensive coastal ecosystems-remain unknown . Here we present an analysis of over 700,000 satellite images that maps the global extent of and change in tidal flats over the course of 33 years (1984-2016). We find that tidal flats, defined as sand, rock or mud flats that undergo regular tidal inundation , occupy at least 127,921 km (124,286-131,821 km , 95% confidence interval). About 70% of the global extent of tidal flats is found in three continents (Asia (44% of total), North America (15.5% of total) and South America (11% of total)), with 49.2% being concentrated in just eight countries (Indonesia, China, Australia, the United States, Canada, India, Brazil and Myanmar). For regions with sufficient data to develop a consistent multi-decadal time series-which included East Asia, the Middle East and North America-we estimate that 16.02% (15.62-16.47%, 95% confidence interval) of tidal flats were lost between 1984 and 2016. Extensive degradation from coastal development , reduced sediment delivery from major rivers , sinking of riverine deltas , increased coastal erosion and sea-level rise signal a continuing negative trajectory for tidal flat ecosystems around the world. Our high-spatial-resolution dataset delivers global maps of tidal flats, which substantially advances our understanding of the distribution, trajectory and status of these poorly known coastal ecosystems.
Publisher: England: Nature Publishing Group
Language: English
Identifier: ISSN: 0028-0836
EISSN: 1476-4687
DOI: 10.1038/s41586-018-0805-8
PMID: 30568300
Source: ProQuest One Psychology
ProQuest Central

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The global distribution and trajectory of tidal flats

COPYRIGHT 2019 Nature Publishing Group ;COPYRIGHT 2019 Nature Publishing Group ;Copyright Nature Publishing Group Jan 10, 2019 ;ISSN: 0028-0836 ;EISSN: 1476-4687 ;DOI: 10.1038/s41586-018-0805-8 ;PMID: 30568300

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