Managing the Risk of Emerging Algae Toxins in Drinking Water: Development of a Targeted Analytical Approach

Janex-Habibi, Marie-Laure; Baudin, I.; Bruchet, A.; Esperanza, M.; Courtois, Sophie; Decottignies, V.; Constans, L.; Chrupalla, S.; Bréhé, M.; Lengronne, Marion; Brient, Luc

doi:10.2166/wpt.2010.079

Cited by 1 publication

(1 citation statement)

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“…The submersible phycocyanin sensor detects a specific algal pigment unique to living cyanobacteria algal cells and uses the in vivo fluorometry technique to make reliable estimates for relative cyanobacteria biomass that can be used to track trends (Brient et al, 2008; Gregor & Maršálek, 2004; Izydorczyk et al, 2005; Janex‐Habibi et al, 2011; YSI Inc., 2006; Zamyadi et al, 2012). The sensor detection limit of 0 to 280,000 cells ml −1 or 0 to 100 relative fluorescence units is estimated from cultures of M. aeruginosa and is equivalent to approximately 220 cells ml −1 when 1 cell ml −1 is equal to 0.1 relative fluorescence units (YSI Inc., 2006).…”

Section: Methodsmentioning

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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