Climate change triggered planktonic cyanobacterial blooms in a regulated temperate river.
Rivers
/ microbiology
Climate Change
Cyanobacteria
/ growth & development
Temperature
Phytoplankton
/ growth & development
Seasons
Phosphorus
/ analysis
Nitrogen
/ analysis
Chlorophyll A
/ analysis
Chlorophyll
/ analysis
Harmful Algal Bloom
Plankton
/ growth & development
Eutrophication
Environmental Monitoring
/ methods
Microcystis
Discharge
Eutrophication
Harmful algae bloom
Phytoplankton
Water temperature
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
15 Jul 2024
15 Jul 2024
Historique:
received:
13
05
2024
accepted:
02
07
2024
medline:
16
7
2024
pubmed:
16
7
2024
entrez:
15
7
2024
Statut:
epublish
Résumé
Harmful algae blooms are a rare phenomenon in rivers but seem to increase with climate change and river regulation. To understand the controlling factors of cyanobacteria blooms that occurred between 2017 and 2020 over long stretches (> 250 km) of the regulated Moselle River in Western Europe, we measured physico-chemical and biological variables and compared those with a long-term dataset (1997-2016). Cyanobacteria (Microcystis) dominated the phytoplankton community in the late summers of 2017-2020 (cyano-period) with up to 110 µg Chlorophyll-a/L, but had not been observed in the river in the previous 20 years. From June to September, the average discharge in the Moselle was reduced to 69-76% and water temperature was 0.9-1.8 °C higher compared to the reference period. Nitrogen (N), phosphorus (P) and silica (Si) declined since 1997, albeit total nutrient concentrations remained above limiting conditions in the study period. Cyanobacterial blooms correlated best with low discharge, high water temperature and low nitrate. We conclude that the recent cyanobacteria blooms have been caused by dry and warm weather resulting in low flow conditions and warm water temperature in the regulated Moselle. Under current climate projections, the Moselle may serve as an example for the future of regulated temperate rivers.
Identifiants
pubmed: 39009635
doi: 10.1038/s41598-024-66586-w
pii: 10.1038/s41598-024-66586-w
doi:
Substances chimiques
Phosphorus
27YLU75U4W
Nitrogen
N762921K75
Chlorophyll A
YF5Q9EJC8Y
Chlorophyll
1406-65-1
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
16298Informations de copyright
© 2024. The Author(s).
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