Drivers and Dynamics of Phytoplankton Communities and Harmful Algal Blooms in Mountain Lakes DOI Open Access
Lara S. Jansen

Published: Aug. 7, 2023

Harmful cyanobacterial blooms (cyanoHABs) are a complex and widespread disturbance in freshwater water bodies, impacting quality for wildlife human populations. While cyanobacteria often bloom warm lakes impacted by development like agriculture, increasingly reported cooler waters with limited the surrounding watershed. As much of cyanoHAB research has focused on highly developed watersheds, understanding factors leading to dominance absence major remains limited. Mountain can serve as ideal systems study bloom-forming watersheds minimal development. In addition, mountain span natural gradients productivity climate due varied elevation topography. also valued recreation habitat sensitive species perceived pristine conditions, but vulnerable multiple stressors such warming increased atmospheric deposition nutrients, which limit growth. Therefore, potential cyanoHABs is likely rise near future, making it crucial understand drivers these lakes.

Language: Английский

What makes a cyanobacterial bloom disappear? A review of the abiotic and biotic cyanobacterial bloom loss factors DOI Creative Commons
Ted D. Harris, Kaitlin L. Reinl, M. Azarderakhsh

et al.

Harmful Algae, Journal Year: 2024, Volume and Issue: 133, P. 102599 - 102599

Published: Feb. 9, 2024

Cyanobacterial blooms present substantial challenges to managers and threaten ecological public health. Although the majority of cyanobacterial bloom research management focuses on factors that control initiation, duration, toxicity, geographical extent, relatively little role loss processes in how these are regulated. Here, we define a process terms population dynamics as any removes cells from population, thereby decelerating or reducing development extent blooms. We review abiotic (e.g., hydraulic flushing oxidative stress/UV light) biotic allelopathic compounds, infections, grazing, resting cells/programmed cell death) known govern loss. found dominant depend several system specific including genera-specific traits, situ physicochemical conditions, microbial, phytoplankton, consumer community composition. also address context discuss perspectives predicting changing climate may directly indirectly affect A deeper understanding their underlying mechanisms help mitigate negative consequences improve current strategies.

Language: Английский

Citations

22
Nutrient availability is the main driver of nanophytoplankton phago-mixotrophy in North American lake surface waters DOI
Philippe Le Noac’h, Bruno Cremella, Jihyeon Kim

et al.

Journal of Plankton Research, Journal Year: 2024, Volume and Issue: 46(1), P. 9 - 24

Published: Jan. 1, 2024

Abstract There has been limited research on the abiotic and biotic factors affecting prevalence of phago-mixotrophy (prevMixo) among nanophytoplankton across freshwater ecosystems. In recent years, large-scale sampling campaigns like EPA-National Lakes Assessment NSERC LakePulse survey have generated surface water community composition data for hundreds lakes North America, covering large environmental gradients. We present results from our analyses these two surveys, focusing a taxonomic comparison mixoplankton communities ecoregions multivariate drivers prevMixo. identified potentially phago-mixotrophic taxa in majority sites all ecozones sampled. Lake trophic state was as main predictor resource-acquisition strategy assemblages, with lower diversity more eutrophic lakes. also controlled increased total phosphorus levels were associated loss diversity. This study represents most comprehensive assessment prevMixo lake to date spanning dozen ecozones.

Language: Английский

Citations

11
Anoxia begets anoxia: A positive feedback to the deoxygenation of temperate lakes DOI Creative Commons
Abigail S. L. Lewis, Maximilian P. Lau, Stephen F. Jane

et al.

Global Change Biology, Journal Year: 2023, Volume and Issue: 30(1)

Published: Dec. 6, 2023

Abstract Declining oxygen concentrations in the deep waters of lakes worldwide pose a pressing environmental and societal challenge. Existing theory suggests that low deep‐water dissolved (DO) could trigger positive feedback through which anoxia (i.e., very DO) during given summer begets increasingly severe occurrences following summers. Specifically, anoxic conditions can promote nutrient release from sediments, thereby stimulating phytoplankton growth, subsequent decomposition fuel heterotrophic respiration, resulting increased spatial extent duration anoxia. However, while individual relationships this are well established, to our knowledge, there has not been systematic analysis within or across simultaneously demonstrates all mechanisms necessary produce reinforces Here, we compiled data 656 widespread temperate reservoirs analyze proposed feedback. Lakes dataset span broad range surface area (1–126,909 ha), maximum depth (6–370 m), morphometry, with median time‐series 30 years at each lake. Using linear mixed models, found support for between anoxia, phosphorus concentrations, chlorophyll demand 656‐lake dataset. Likewise, further these by analyzing lakes. Our results indicate strength may vary lake‐specific characteristics: For example, were more positively associated high‐phosphorus lakes, had stronger influence on Taken together, existence magnify effects climate change other anthropogenic pressures driving development around world.

Language: Английский

Citations

11
Effect of rainfall in shaping microbial community during Microcystis bloom in Nakdong River, Korea DOI Creative Commons

Mingyeong Kang,

Ve Van Le, So-Ra Ko

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 928, P. 172482 - 172482

Published: April 14, 2024

Various environmental factors play a role in the formation and collapse of Microcystis blooms. This study investigates impact heavy rainfall on cyanobacterial abundance, microbial community composition, functional dynamics Nakdong River, South Korea, during typical exceptionally rainy years. The results reveal distinct responses to variations, particularly dominance physicochemical characteristics. In 2020, characterized by unprecedented from mid-July August, blooms were interrupted significantly, exhibiting lower cell densities decreased water temperature, compared normal bloom patterns 2019. Moreover, composition varied, with increases Gammaproteobacteria notably genera Limnohabitans Fluviicola. These alterations conditions bacterial similar those post-bloom period late September It shows that summer leads changes factors, consequently causing shifts communities akin observed autumn-specific also accompany functions, primarily involved degradation organic matter such as amino acids, fatty terpenoids, which are assumed have been released due significant cyanobacteria. Our demonstrate early induces subsequently their autumn, leading earlier breakdown

Language: Английский

Citations

4
Health and Environmental Impacts of Cyanobacteria and Cyanotoxins from Freshwater to Seawater DOI Creative Commons

Tamara Villalobos,

Benjamín A. Suárez‐Isla,

Carlos Garcı́a

et al.

Toxins, Journal Year: 2025, Volume and Issue: 17(3), P. 126 - 126

Published: March 7, 2025

Cyanobacterial harmful algal blooms (cyanoHABs) are a natural phenomenon produced mainly by the interaction between and anthropogenic events. CyanoHABs characterized production of cyanotoxins that can have effects on different species within food web even affect human health. Among most prevalent toxin groups worldwide microcystins (MCs), anatoxins (ATXs), cylindrospermopsins (CYNs) nodularins (NODs), which as toxins with hepatotoxic, neurotoxic, cytotoxic effects. This review summarizes analyzes research influence cyanoHABs, main toxin-producing cyanobacteria in freshwater marine bodies, highlighting their global occurrence, toxicology, bioaccumulation dynamics vectors web, cases acute chronic intoxications humans. is useful for understanding cyanoHABs’ ecosystem impact health, how implementation surveillance management framework could generate vital information stakeholders to establish health guidelines risks hazards cyanoHABs

Language: Английский

Citations

0
Assessment of Harmful Algae as an Emerging Pollutant in Domestic Water Supply from Rainwater Harvesting Facilities in Sudan DOI Creative Commons

Wifag Hassan Mahmoud,

Sabry Wahba,

Muna Mohammed Musnad

et al.

Advances in water security, Journal Year: 2025, Volume and Issue: unknown, P. 89 - 107

Published: Jan. 1, 2025

Language: Английский

Citations

0
Biodiversity Congruence Across Lake‐Watershed Landscapes: Insights From an Analysis of 615 Canadian Sites DOI Creative Commons
Sarwat N. Mirza, Irene Gregory‐Eaves, Yannick Huot

et al.

Diversity and Distributions, Journal Year: 2025, Volume and Issue: 31(5)

Published: May 1, 2025

ABSTRACT Aim The rapid decline in freshwater biodiversity and growing disturbances adjacent terrestrial systems (deforestation, wetland destruction, etc.) are threatening the status of watershed ecosystems. This study focuses on both aquatic realms to provide a general assessment health integrity across 12 ecozones Canada. goal is improve our geographical trends Canadian watersheds support decision making for land use planning. Location. 615 lake watersheds, spanning ecozones. Methods We used species richness Shannon's metrics quantify map phytoplankton, zooplankton trees A series generalised additive models (GAMs), one‐way ANOVA, Tukey HSD tests were conducted investigate relationship between spatial trend Lastly, multivariate regression tree (MRT) analyses performed use, environmental variables biodiversity. Results Total followed longitudinal pattern, where estimates greatest eastern Canada lowest central‐western (e.g., Prairies). found moderately positive relationships that varied different generally strongest from MRTs revealed total correlated positively with proportion natural landscapes precipitation negatively agricultural area. Main Conclusion. Our findings better understanding broad‐scale distribution, which strongly influenced by North American elevation gradient patterns climatic conditions precipitation). area be variable negative correlation These results first portrait cross‐ecosystem diversity key resource large‐scale planning climate change mitigation efforts.

Language: Английский

Citations

0
Ironing out the question: what is limiting cyanobacteria in freshwater lakes in the Prairie Pothole Region? DOI Creative Commons
Irena F. Creed, O. E. Salmon, Kevin J. Erratt

et al.

Biogeochemistry, Journal Year: 2025, Volume and Issue: 168(3)

Published: May 20, 2025

Language: Английский

Citations

0
Cyanobacterial biomass prediction in a shallow lake using the time series SARIMAX models DOI
Yan Guo, Xijun Lai, Min Gan

et al.

Ecological Informatics, Journal Year: 2023, Volume and Issue: 78, P. 102292 - 102292

Published: Sept. 7, 2023

Language: Английский

Citations

9
Watershed, lake, and food web factors influence diazotrophic cyanobacteria in mountain lakes DOI Creative Commons
Lara S. Jansen,

D. J. Sobota,

Yangdong Pan

et al.

Limnology and Oceanography, Journal Year: 2024, Volume and Issue: 69(3), P. 681 - 699

Published: Feb. 3, 2024

Abstract Cyanobacterial blooms can occur in freshwater ecosystems largely isolated from development and not experiencing extensive cultural eutrophication. For example, remote mountain lakes experience intense of diazotrophic (nitrogen‐fixing) cyanobacteria caused by factors acting at different spatial temporal scales. In this study, we examined how cross‐scale interactions among watershed, lake, food web characteristics influence biovolume lakes. We quantified biovolume, zooplankton abundance, physico‐chemical variables for 29 the Cascade Mountains Oregon, USA, summer 2019. Watershed were compiled historical datasets available region. Diazotrophic ranged across 0 to 1,930,000 μ m 3 mL −1 ; Dolichospermum was most common genus. Random forest models showed that 11 explained 76% variance sampled Structural equation suggested drainage ratio (i.e., relative area lake watershed) positively related phosphorus concentrations and, turn, diazotroph biovolume. Among lakes, hypolimnetic dissolved oxygen negatively correlated with possibly due release nutrients, like phosphate iron, bound sediments. addition, grazers potentially reflecting stocked fish. Thus, management must account bottom‐up factors, such as nutrient loading, which is influenced morphometry watershed size, well top‐down fish stocking, effectively mitigate cyanobacterial blooms.

Language: Английский

Citations

3