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Global mapping reveals increase in lacustrine algal blooms over the past decade
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Global mapping reveals increase in lacustrine algal blooms over the past decade
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Journal Article
Global mapping reveals increase in lacustrine algal blooms over the past decade
2022
Overview
Algal blooms constitute an emerging threat to global inland water quality, yet their spatial and temporal distribution at the global scale remains largely unknown. Here we establish a global bloom database, using 2.91 million Landsat satellite images from 1982 to 2019 to characterize algal blooms in 248,243 freshwater lakes, representing 57.1% of the global lake area. We show that 21,878 lakes (8.8%) spread across six continents have experienced algal blooms. The median bloom occurrence of affected lakes was 4.6%, but this frequency is increasing; we found increased bloom risks in the 2010s, globally (except for Oceania). The most pronounced increases were found in Asia and Africa, mostly in developing countries that remain reliant on agricultural fertilizer. As algal blooms continue to expand in scale and magnitude, this baseline census will be vital towards future risk assessments and mitigation efforts.
Algal blooms are occurring more frequently, as seen in a global database compiled from satellite imagery from the past few decades.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ 704/286
/ Algae
/ Biologi
/ Earth and Environmental Science
/ Earth and Related Environmental Sciences
/ Ecology (including Biodiversity Conservation)
/ Ekologi
/ Geology
/ Geovetenskap och relaterad miljövetenskap
/ Imagery
/ Lakes
/ Landsat
/ LDCs
/ Oceanografi, hydrologi och vattenresurser
