Sustaining recreational quality of European lakes: minimizing the health risks from algal blooms through phosphorus control

Carvalho, Laurence; McDonald, Claire; de Hoyos, Caridad; Mischke, Ute; Phillips, Geoff; Borics, Gabor; Poikane, Sandra; Skjelbred, Birger; Lyche Solheim, Anne; van Wichelen, Jeroen; Cardoso, Ana Cristina. 2013 Sustaining recreational quality of European lakes: minimizing the health risks from algal blooms through phosphorus control. Journal of Applied Ecology, 50 (2). 315-323. 10.1111/1365-2664.12059

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Abstract/Summary

1. A safe, clean water supply is critical for sustaining many important ecosystem services provided by freshwaters. The development of cyanobacterial blooms in lakes and reservoirs has a major impact on the provision of these services, particularly limiting their use for recreation and water supply for drinking and spray irrigation. Nutrient enrichment is thought to be the most important pressure responsible for the widespread increase in cyanobacterial blooms in recent decades. Quantifying how nutrients limit cyanobacterial abundance in lakes is, therefore, a key need for setting robust targets for the management of freshwaters. 2. Using a dataset from over 800 European lakes, we highlight the use of quantile regression modelling for understanding the maximum potential capacity of cyanobacteria in relation to total phosphorus (TP) and the use of a range of quantile responses, alongside World Health Organisation (WHO) health alert thresholds for recreational waters, for setting robust phosphorus targets for lake management in relation to water use. 3. The analysis shows that cyanobacteria exhibit a non-linear response to phosphorus with the sharpest increase in cyanobacterial abundance occurring in the TP range from about 20 µg L-1 up to about 100 µg L-1. 4. The likelihood of exceeding the World Health Organisation (WHO) ‘low health alert’ threshold increases from about 5% exceedance at 16 µg L-1 to 40% exceedance at 54 µg L-1. About 50% of the studied lakes remain below this WHO health alert threshold, irrespective of high summer TP concentrations, highlighting the importance of other factors affecting cyanobacteria population growth and loss processes, such as high flushing rate. 5. Synthesis and applications. Developing a more quantitative understanding of the effect of nutrients on cyanobacterial abundance in freshwater lakes provides important knowledge for restoring and sustaining a safe, clean water supply for multiple uses. Our models can be used to set nutrient targets to sustain recreational services and provide different levels of precaution that can be chosen dependent on the importance of the service provision.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1111/1365-2664.12059
Programmes:	CEH Topics & Objectives 2009 - 2012 > Water > WA Topic 3 - Science for Water Management > WA - 3.4 - Develop novel and improved methods to enable the sustainable management of freshwaters and wetlands
UKCEH and CEH Sections/Science Areas:	Watt
ISSN:	0021-8901
Additional Keywords:	algal bloom, blue-green algae, ecosystem services, freshwater, lake, nutrient, quantile regression, WHO
NORA Subject Terms:	Ecology and Environment Health Biology and Microbiology
Date made live:	14 Mar 2013 11:44 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/21406

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