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Response of Natural Cyanobacteria and Algae Assemblages to a Nutrient Pulse and Elevated Temperature

Eutrophication (nutrient over-enrichment) is the primary worldwide water quality issue often leading to nuisance cyanobacterial blooms. Climate change is predicted to cause further rise of cyanobacteria blooms as cyanobacteria can have a competitive advantage at elevated temperatures. We tested the...

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Autores principales: Lürling, Miquel, Mello, Mariana Mendes e, van Oosterhout, Frank, de Senerpont Domis, Lisette, Marinho, Marcelo M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6099115/
https://www.ncbi.nlm.nih.gov/pubmed/30150976
http://dx.doi.org/10.3389/fmicb.2018.01851
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author Lürling, Miquel
Mello, Mariana Mendes e
van Oosterhout, Frank
de Senerpont Domis, Lisette
Marinho, Marcelo M.
author_facet Lürling, Miquel
Mello, Mariana Mendes e
van Oosterhout, Frank
de Senerpont Domis, Lisette
Marinho, Marcelo M.
author_sort Lürling, Miquel
collection PubMed
description Eutrophication (nutrient over-enrichment) is the primary worldwide water quality issue often leading to nuisance cyanobacterial blooms. Climate change is predicted to cause further rise of cyanobacteria blooms as cyanobacteria can have a competitive advantage at elevated temperatures. We tested the hypothesis that simultaneous rise in nutrients and temperature will promote cyanobacteria more than a single increase in one of the two drivers. To this end, controlled experiments were run with seston from 39 different urban water bodies varying in trophic state from mesotrophic to hypertrophic. These experiments were carried out at two different temperatures, 20°C (ambient) and 25°C (warming scenario) with or without the addition of a surplus of nutrients (eutrophication scenario). To facilitate comparisons, we quantified the effect size of the different treatments, using cyanobacterial and algal chlorophyll a concentrations as a response variable. Cyanobacterial and algal chlorophyll a concentrations were determined with a PHYTO-PAM phytoplankton analyzer. Warming caused an 18% increase in cyanobacterial chlorophyll-a, while algal chlorophyll-a concentrations were on average 8% higher at 25°C than at 20°C. A nutrient pulse had a much stronger effect on chlorophyll-a concentrations than warming. Cyanobacterial chlorophyll-a concentrations in nutrient enriched incubations at 20 or 25°C were similar and 9 times higher than in the incubations without nutrient pulse. Likewise, algal chlorophyll-a concentrations were 6 times higher. The results of this study confirm that warming alone yields marginally higher cyanobacteria chlorophyll-a concentrations, yet that a pulse of additional nutrients is boosting blooms. The responses of seston originating from mesotrophic waters seemed less strong than those from eutrophic waters, which indicates that nutrient control strategies –catchment as well as in-system measures– could increase the resilience of surface waters to the negative effects of climate change.
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spelling pubmed-60991152018-08-27 Response of Natural Cyanobacteria and Algae Assemblages to a Nutrient Pulse and Elevated Temperature Lürling, Miquel Mello, Mariana Mendes e van Oosterhout, Frank de Senerpont Domis, Lisette Marinho, Marcelo M. Front Microbiol Microbiology Eutrophication (nutrient over-enrichment) is the primary worldwide water quality issue often leading to nuisance cyanobacterial blooms. Climate change is predicted to cause further rise of cyanobacteria blooms as cyanobacteria can have a competitive advantage at elevated temperatures. We tested the hypothesis that simultaneous rise in nutrients and temperature will promote cyanobacteria more than a single increase in one of the two drivers. To this end, controlled experiments were run with seston from 39 different urban water bodies varying in trophic state from mesotrophic to hypertrophic. These experiments were carried out at two different temperatures, 20°C (ambient) and 25°C (warming scenario) with or without the addition of a surplus of nutrients (eutrophication scenario). To facilitate comparisons, we quantified the effect size of the different treatments, using cyanobacterial and algal chlorophyll a concentrations as a response variable. Cyanobacterial and algal chlorophyll a concentrations were determined with a PHYTO-PAM phytoplankton analyzer. Warming caused an 18% increase in cyanobacterial chlorophyll-a, while algal chlorophyll-a concentrations were on average 8% higher at 25°C than at 20°C. A nutrient pulse had a much stronger effect on chlorophyll-a concentrations than warming. Cyanobacterial chlorophyll-a concentrations in nutrient enriched incubations at 20 or 25°C were similar and 9 times higher than in the incubations without nutrient pulse. Likewise, algal chlorophyll-a concentrations were 6 times higher. The results of this study confirm that warming alone yields marginally higher cyanobacteria chlorophyll-a concentrations, yet that a pulse of additional nutrients is boosting blooms. The responses of seston originating from mesotrophic waters seemed less strong than those from eutrophic waters, which indicates that nutrient control strategies –catchment as well as in-system measures– could increase the resilience of surface waters to the negative effects of climate change. Frontiers Media S.A. 2018-08-13 /pmc/articles/PMC6099115/ /pubmed/30150976 http://dx.doi.org/10.3389/fmicb.2018.01851 Text en Copyright © 2018 Lürling, Mendes e Mello, van Oosterhout, de Senerpont Domis and Marinho. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Microbiology
Lürling, Miquel
Mello, Mariana Mendes e
van Oosterhout, Frank
de Senerpont Domis, Lisette
Marinho, Marcelo M.
Response of Natural Cyanobacteria and Algae Assemblages to a Nutrient Pulse and Elevated Temperature
title Response of Natural Cyanobacteria and Algae Assemblages to a Nutrient Pulse and Elevated Temperature
title_full Response of Natural Cyanobacteria and Algae Assemblages to a Nutrient Pulse and Elevated Temperature
title_fullStr Response of Natural Cyanobacteria and Algae Assemblages to a Nutrient Pulse and Elevated Temperature
title_full_unstemmed Response of Natural Cyanobacteria and Algae Assemblages to a Nutrient Pulse and Elevated Temperature
title_short Response of Natural Cyanobacteria and Algae Assemblages to a Nutrient Pulse and Elevated Temperature
title_sort response of natural cyanobacteria and algae assemblages to a nutrient pulse and elevated temperature
topic Microbiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6099115/
https://www.ncbi.nlm.nih.gov/pubmed/30150976
http://dx.doi.org/10.3389/fmicb.2018.01851
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