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Increasingly Severe Cyanobacterial Blooms and Deep Water Hypoxia Coincide with Warming Water Temperatures in Reservoirs by Nathan J. Smucker; Jake J. Beaulieu; Christopher T. Nietch; Jade L. Young is a Environmental Science article available to read on EtoBox.

What is Increasingly Severe Cyanobacterial Blooms and Deep Water Hypoxia Coincide with Warming Water Temperatures in Reservoirs about?

Cyanobacterial blooms are expected to intensify and become more widespread with climate change and sustained nutrient pollution, subsequently increasing threats to lentic ecosystems, water quality, and human health. However, little is known about their rates of change because long-term monitoring data are rare, except for some well-studied individual lakes, which typically are large and broadly dispersed geographically. Using monitoring data spanning 1987-2018 for 20 temperate reservoirs located in the USA, we found that cyanobacteria cell densities mostly posed low-to-moderate human health risks until 2003-2005, after which cell densities rapidly increased. Increases were greatest in reservoirs with extensive agriculture in their watersheds, but even those with mostly forested watersheds experienced increases. Since 2009, cell densities posing high human health risks have become frequent with 75% of yearly observations exceeding 100,000 cells ml , including 53% of observations from reservoirs with mostly forested watersheds. These increases coincided with progressively earlier and longer summer warming of surface waters, evidence of earlier onset of stratification, lengthening dur

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Author

Nathan J. Smucker; Jake J. Beaulieu; Christopher T. Nietch; Jade L. Young

Publisher

Wiley

Published

2021

Language

EN

Field

Environmental Science (Physical Sciences)