Spatial-temporal variability of in situ cyanobacteria vertical structure in Western Lake Erie: Implications for remote sensing observations

Bosse, Karl R.; Sayers, Michael J.; Shuchman, Robert A.; Fahnenstiel, Gary L.; Ruberg, Steven A.; Fanslow, David L.; Stuart, Dack; Johengen, Thomas H.; Burtner, Ashley M.

doi:10.1016/j.jglr.2019.02.003

Cited by 38 publications

(21 citation statements)

References 61 publications

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“…The absence of impact of the stressors can be attributed to sampling protocol (reduction of the size range variability by gillnet selectivity for fish) and to size assessment for phytoplankton (very simplified and coarse) [41,42,66]. In addition, the high temporal and spatial variability of the abundance of cyanobacteria is a limit to this type of analysis [93,94].…”

Section: Discussionmentioning

confidence: 99%

How Do Eutrophication and Temperature Interact to Shape the Community Structures of Phytoplankton and Fish in Lakes?

Bouraï

Logez

Laplace-Treyture

et al. 2020

Water

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Freshwater ecosystems are among the systems most threatened and impacted by anthropogenic activities, but there is still a lack of knowledge on how this multi-pressure environment impacts aquatic communities in situ. In Europe, nutrient enrichment and temperature increase due to global change were identified as the two main pressures on lakes. Therefore, we investigated how the interaction of these two pressures impacts the community structure of the two extreme components of lake food webs: phytoplankton and fish. We modelled the relationship between community components (abundance, composition, size) and environmental conditions, including these two pressures. Different patterns of response were highlighted. Four metrics responded to only one pressure and one metric to the additive effect of the two pressures. Two fish metrics (average body-size and biomass ratio between perch and roach) were impacted by the interaction of temperature and eutrophication, revealing that the effect of one pressure was dependent on the magnitude of the second pressure. From a management point of view, it appears necessary to consider the type and strength of the interactions between pressures when assessing the sensitivity of communities, otherwise their vulnerability (especially to global change) could be poorly estimated.

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Section: Discussionmentioning

confidence: 99%

How Do Eutrophication and Temperature Interact to Shape the Community Structures of Phytoplankton and Fish in Lakes?

Bouraï

Logez

Laplace-Treyture

et al. 2020

Water

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“…Seven in situ spectral profiles were collected in the sinkhole and in open water in 2015–2016. Profiles were collected using a Sea‐Bird HyperPro II profiler equipped with up‐ and down‐facing HyperOCR radiometers measuring wavelengths 348–801 nm (bin size = 3.3 nm), plus an identical fixed surface radiometer to record sky conditions (Bosse et al ., 2019). The profiler was deployed on the sunny side of the vessel and allowed to free‐fall through the water column to avoid the vessel shadow.…”

Section: Methodsmentioning

confidence: 99%

Nitrate respiration and diel migration patterns of diatoms are linked in sediments underneath a microbial mat

Merz

Dick

Beer

et al. 2020

Environmental Microbiology

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Diatoms are among the few eukaryotes known to store nitrate (NO 3 −) and to use it as an electron acceptor for respiration in the absence of light and O 2. Using microscopy and 15 N stable isotope incubations, we studied the relationship between dissimilatory nitrate/nitrite reduction to ammonium (DNRA) and diel vertical migration of diatoms in phototrophic microbial mats and the underlying sediment of a sinkhole in Lake Huron (USA). We found that the diatoms rapidly accumulated NO 3 − at the mat-water interface in the afternoon and 40% of the population migrated deep into the sediment, where they were exposed to dark and anoxic conditions for 75% of the day. The vertical distribution of DNRA rates and diatom abundance maxima coincided, suggesting that DNRA was the main energy generating metabolism of the diatom population. We conclude that the illuminated redox-dynamic ecosystem selects for migratory diatoms that can store nitrate for respiration in the absence of light. A major implication of this study is that the dominance of DNRA over denitrification is not explained by kinetics or thermodynamics. Rather, the dynamic conditions select for migratory diatoms that perform DNRA and can outcompete sessile denitrifiers.

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“…For example, M. aeruginosa may produce high amounts of the liver toxin microcystin-LR when water temperature is approximately 26°C (Crettaz et al, 2017). Research suggests that cyanotoxins in lakes may be increasing along with rising water temperatures (Bosse et al, 2019;Huber et al, 2012;Taranu et al, 2012) and increasing dominance of toxin-producing cyanobacteria (Pilon et al, 2019). Thus, the link between rising temperatures, increasing dominance of cyanobacteria, and the potential for cyanotoxin production is of concern here, especially in study reservoirs where cyanobacteria blooms are already a problem.…”

Section: Water Resources Researchmentioning

confidence: 99%

“…High water temperatures and thermal stratification can lead to cyanobacteria blooms as warmer temperatures increase cyanobacteria growth rates and stratified conditions help certain species outcompete other algal species for nutrients and sunlight (Descy et al, 2017; Downing & Duarte, 2009; Huisman et al, 2004; Paerl & Huisman, 2009; Persaud et al, 2015; Rigosi et al, 2014; Wagner & Adrian, 2009). Moreover, cyanobacteria can be problematic for drinking water quality and reservoir management because certain strains produce cyanotoxins that may be harmful to humans if ingested (Sivonen & Jones, 1999; Trevino‐Garrison et al, 2015), and cyanotoxins in lakes may be increasing along with rising regional water temperatures and increasing dominance of toxin‐producing cyanobacteria (Bosse et al, 2019; Huber et al, 2012; Pilon et al, 2019; Taranu et al, 2012). Scholars have begun to quantify changes in surface water temperature, thermal stratification, and cyanobacteria productivity, especially in large and moderately sized temperate lakes (Deng et al, 2018; Dobiesz & Lester, 2009; King et al, 1998; Piccolroaz, 2016).…”

Section: Introductionmentioning

confidence: 99%

Future Projections of Water Temperature and Thermal Stratification in Connecticut Reservoirs and Possible Implications for Cyanobacteria

Mullin

Kirchhoff

Wang

et al. 2020

Water Resources Research

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Future climate warming may increase water temperature, stratification, and the occurrence of cyanobacteria blooms in drinking water reservoirs. Herein, past relationships between air temperature, water temperature, thermal stratification, and cyanobacteria prevalence are quantified in six Connecticut, U.S.A., reservoirs. Lake-specific empirical models were developed and used to project historical (1971-2000) and future (mid-century, 2041-2070) water temperature and thermal stratification in the study lakes. Projections are driven with downscaled air temperature projections from three general circulation models (i.e., HadGEM2-CC365, CCSM4, and GFDL-ESM 2M) under Representative Concentration Pathway 8.5. Results suggest that reservoirs in Connecticut are warming relatively quickly over time and that surface, average, and bottom water temperatures may continue to increase by 0.44°C, 0.30°C, and 0.16°C per decade, respectively. Future projections of thermal stratification indicate that significant increases may occur in July-September and that stratification is likely to begin 2-4 weeks earlier and last 2-4 weeks longer by mid-century. High-risk cyanobacteria blooms, defined as those exceeding 70,000 cells ml −1 , historically occurred in three of the study reservoirs and are correlated with the occurrence of high surface water temperatures, cool bottom water temperatures, and high total Relative Thermal Resistance to Mixing (RTRM). Days per year with extreme high water temperatures and total RTRM are projected to increase significantly in the future. This shift may favor increased dominance of certain cyanobacteria species that tend to grow best in these extreme conditions, especially in reservoirs where cyanobacteria blooms are already a concern. Plain Language Summary Certain cyanobacteria, also called blue-green algae, can bloom and produce cyanotoxins that are harmful to human health. This study seeks to understand how future changes in warm, calm lake conditions may impact the frequency and severity of future cyanobacteria blooms in Connecticut lakes. Results suggest that small reservoirs in Connecticut are warming faster than global lakes on average. We anticipate that warm, calm lake conditions will increase significantly over time, with the most substantial increases expected from July-September. Specifically, we found that days with extreme hot surface water temperatures (above 77°F) are expected to increase by approximately 48 ± 8 days a year by mid-century (2041-2070), compared to the historical reference period (1971-2000). Lake mixing is also expected to decrease significantly in July-September. These changes may promote the growth and dominance of certain cyanobacteria species that grow best in these extreme hot conditions, especially in reservoirs where cyanobacteria blooms are already a concern.

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Spatial-temporal variability of in situ cyanobacteria vertical structure in Western Lake Erie: Implications for remote sensing observations

Cited by 38 publications

References 61 publications

How Do Eutrophication and Temperature Interact to Shape the Community Structures of Phytoplankton and Fish in Lakes?

How Do Eutrophication and Temperature Interact to Shape the Community Structures of Phytoplankton and Fish in Lakes?

Nitrate respiration and diel migration patterns of diatoms are linked in sediments underneath a microbial mat

Future Projections of Water Temperature and Thermal Stratification in Connecticut Reservoirs and Possible Implications for Cyanobacteria

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