The unprecedented 2022 extreme summer heatwaves increased harmful cyanobacteria blooms

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 896, P. 165312 - 165312

Published: July 5, 2023

Language: Английский

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Changes of phytoplankton and water environment in a highly urbanized subtropical lake during the past ten years

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 879, P. 162985 - 162985

Published: March 22, 2023

Language: Английский

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Microcystin concentrations and congener composition in relation to environmental variables across 440 north-temperate and boreal lakes

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 884, P. 163811 - 163811

Published: April 29, 2023

Understanding the environmental conditions and taxa that promote occurrence of cyanobacterial toxins is imperative for effective management lake ecosystems. Herein, we modeled total microcystin presence concentrations with a broad suite predictors cyanobacteria community data collected across 440 Canadian lakes using standardized methods. We also conducted focused analysis targeting 14 congeners 190 lakes, to examine how abiotic biotic factors influence their relative proportions. Microcystins were detected in 30 % highest occurring most eutrophic located ecozones central Canada. The two commonly MC-LR (61 lakes) MC-LA (37 lakes), while 11 others more sporadically waterbodies. Congener diversity peaked Canada where biomass was highest. Using zero-altered hurdle model, probability detecting best explained by increasing Microcystis biomass, Daphnia cyclopoid soluble reactive phosphorus, pH wind. Microcystin increased other less dominant taxa, as well copepod dissolved inorganic carbon water temperature. Collectively, these models accounted 34 70 variability, respectively. Based on multiple factor congeners, data, zooplankton found abundance varied according trophic state related combination genera biomasses variables.

Language: Английский

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Increased risk of cyanobacterial blooms in northern high‐latitude lakes through climate warming and phosphorus enrichment

Freshwater Biology, Journal Year: 2017, Volume and Issue: 62(12), P. 1986 - 1996

Published: Nov. 1, 2017

Abstract Harmful cyanobacterial blooms are an increasing problem at many locations throughout the world but rarely reported in aquatic habitats high latitudes. Shallow lakes a major feature of northern permafrost landscapes and likely to experience large‐scale changes their limnological properties future as consequence climate warming. In present study, we addressed question what preconditions would be necessary stimulate growth dominance bloom‐forming cyanobacteria fresh waters. We analysed summer phytoplankton 18 on eroding (thaw lakes) glacier‐scoured rock (rock basin subarctic Quebec, Canada, determine community structure biomass contribution cyanobacteria. This survey was complemented with incubation experiment evaluate direct warming indirect phosphorus (P) enrichment effects change bloom development. All contained diverse communities, often dominated by chrysophytes, dinoflagellates chlorophytes. Cyanobacteria were all waterbodies, total biovolume highly variable (mean 8.7%, range 0.1%–47%). Cyanobacterial biovolumes correlated positively surface water temperatures, negatively dissolved organic carbon, soluble reactive phosphorus, iron manganese concentrations Phosphorus from thaw lake resulted fourfold increase chlorophyll (Chl‐ ) pigments echinenone zeaxanthin. The counts showed that there sharp decrease diversity (expressed decline Shannon–Wiener index 1.69 0.16), accompanied shift dominance, notably heterocystous, potentially toxic species Dolichospermum cf. planctonicum . Increased temperature led initial doubling biovolume, followed development chrysophyte bloom. Combined P reduced biodiversity, composed chrysophytes. There also pronounced response picophytoplankton community; picocyanobacteria strongly stimulated enrichment, while picoeukaryotes increased current inoculum levels responsiveness indicate potential for abrupt abundance, diversity. Ongoing will risk noxious ponds, negative consequences higher trophic levels.

Language: Английский

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Towards phosphorus sustainability in North America: A model for transformational change

Environmental Science & Policy, Journal Year: 2017, Volume and Issue: 77, P. 151 - 159

Published: Sept. 3, 2017

Language: Английский

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