Interaction among spring phytoplankton succession, water discharge patterns, and hydrogen peroxide dynamics in the Caloosahatchee River in southwest Florida

Urakawa, Hidetoshi; Steele, Jacob H.; Hancock, Taylor L.; Dahedl, Elizabeth K.; Schroeder, Elizabeth R.; Sereda, Julia V.; Kratz, Michael A.; García, Pérez; Armstrong, Rick A.

doi:10.1016/j.hal.2023.102434

Cited by 6 publications

(3 citation statements)

References 47 publications

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“…FGCU122 was highly sensitive to hydrogen peroxide and the growth never recovered after the initial crash on day 3 (Figure 2), supporting previous findings of a 2 mg/L hydrogen peroxide dose being required to completely remove Dolichospermum circinale [47]. Dolichospermum are another toxin-producing cyanobacterium known to frequently form nuisance blooms in SWFL [48], and this result highlights the effectiveness of hydrogen peroxide on Dolichospermum blooms [49]. All the aforementioned cyanobacterial strains (FGCU3, FGCU52, and FGCU122) were found to be highly sensitive to mixed treatments, with the growth inhibition ranging from 73.2 to 87.5% (n = 9) on the last day of the experiment (Figure 3).…”

Section: Differences In Sensitivity Of Other Phytoplankton To Hydroge...supporting

confidence: 84%

“…The sensitivity of other cyanobacteria (FGCU3, FGCU52, and FGCU122) to L-lysine was significantly less than M. aeruginosa on the last day of the experiment (p < 0.01, n = 27) (Figure 3), showing this treatment option does not have broad application potential for the removal of other CyanoHAB-forming taxa as is found with hydrogen-peroxide-based algaecides [14]. From our understanding, picocyanobacterial sensitivity to L-lysine application is limited, and our finding that the tested strains (FGCU3, FGCU52, and FGCU54) were less sensitive than most examined M. aeruginosa strains is beneficial as these organisms are found to have high annual abundance in this subtropical region [48,51], where they contribute significantly to carbon fixation and biogeochemical cycling [52].…”

Section: Differences In Sensitivity Of Other Phytoplankton To Hydroge...mentioning

confidence: 69%

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Differential Effects of Hydrogen Peroxide and L-Lysine Treatments on the Growth of Freshwater Cyanophyta and Chlorophyta

Dahedl

Urakawa

2023

Ecologies

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Harmful cyanobacterial blooms of the toxin-producing Microcystis have become a growing problem for Southwest Florida freshwater bodies. Recently, a 2016 bloom in Lake Okeechobee and a 2018 bloom in the Caloosahatchee River both led to the declaration of a state of emergency for the state of Florida. Fast-acting suppression methods are needed to protect residents and wildlife. Hydrogen peroxide and L-lysine have shown promising results in selectively inhibiting the growth of Microcystis aeruginosa and are more ecologically friendly due to fast degradation in water or the biological enhancement of nontarget organisms, respectively. We further explored the use of hydrogen peroxide, L-lysine, and combined treatments of both chemicals, which have never been tested before, for the rapid suppression of Microcystis. We assessed the susceptibility of seven M. aeruginosa strains and six other phytoplankton (Cyanobium spp., Synechococcus sp., Dolichospermum planctonica, Mychonastes homosphaera, and Chromochloris zofingiensis) commonly found in Florida, and revealed that susceptibility was diverse. All three treatments were effective at inhibiting the growth of M. aeruginosa, mixed treatments (16.7 mg/L hydrogen peroxide: 8 mg/L L-lysine) were most effective with a median growth inhibition ratio of 94.2% on the last day of the experiment, while hydrogen peroxide (16.7 mg/L) (83.8%) and L-lysine (8 mg/L) (78.5%) were less so. We found axenic M. aeruginosa to be significantly more sensitive to hydrogen peroxide when compared with nonaxenic strains (p < 0.01, n = 18). L-lysine was found to be significantly more toxic to M. aeruginosa than other examined cyanobacteria and chlorophyte strains at the end of the experiment (p < 0.001, n = 33), demonstrating its specificity to this cyanobacterium, while hydrogen peroxide and mixed treatments had varying effects on the other tested phytoplankton.

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Section: Differences In Sensitivity Of Other Phytoplankton To Hydroge...supporting

confidence: 84%

Section: Differences In Sensitivity Of Other Phytoplankton To Hydroge...mentioning

confidence: 69%

Differential Effects of Hydrogen Peroxide and L-Lysine Treatments on the Growth of Freshwater Cyanophyta and Chlorophyta

Dahedl

Urakawa

2023

Ecologies

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“…The effect of Caloosahatchee River discharge on the concentration of chemical constituents has been investigated in many previous studies [26][27][28][29]. For example, the effect of river discharge on water quality parameters (e.g., Ammonia-n (NH 4 ) Nitrates, Ortho Phosphate-p, Total Nitrogen-n, and Total Organic Carbon) [26], phytoplankton communities [27], bottom dissolved oxygen concentration [28], and colored dissolved organic matter [29] has been extensively studied. The research by Xia et al (2010) [28] also found that the dissolved oxygen concentration showed a strong relationship to wind forcing at the estuary.…”

Section: Study Domain and Bathymetrymentioning

confidence: 99%

Main Physical Processes Affecting the Residence Times of a Micro-Tidal Estuary

Hewageegana

Olabarrieta

González-Ondina

2023

JMSE

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Residence time is an important parameter linked to the water quality in an estuary. In this paper, we identify and analyze the main processes that affect the residence time of the Caloosahatchee River Estuary, a micro-tidal and mixed diurnal-semidiurnal estuary located in western Florida. Multiyear validated hydrodynamic hindcast results were coupled with an offline particle tracking model to compute the residence time of the estuary, which showed a strong seasonality driven by the river discharge. The residence time reduced with increasing river flow. The wind velocity and direction also affected the residence time. The influence of the wind was dependent on the magnitude of the river discharge. In general, upstream-directed wind increased residence time, while downstream-directed wind decreased residence time. Downstream wind during the dry period reduced residence time on average by a week. Processes such as water density gradient-induced circulation and particle buoyancy also influenced the residence time of the estuary. The outcomes of this study can be used to better understand the influence of the main physical processes affecting the residence time at other similar estuaries and to help in the management of the estuaries to improve their water quality.

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Synechococcus dominance induced after hydrogen peroxide treatment of Microcystis bloom in the Caloosahatchee River, Florida

Hancock,

Dahedl,

Kratz

et al. 2024

Environmental Pollution

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Interaction among spring phytoplankton succession, water discharge patterns, and hydrogen peroxide dynamics in the Caloosahatchee River in southwest Florida

Cited by 6 publications

References 47 publications

Differential Effects of Hydrogen Peroxide and L-Lysine Treatments on the Growth of Freshwater Cyanophyta and Chlorophyta

Differential Effects of Hydrogen Peroxide and L-Lysine Treatments on the Growth of Freshwater Cyanophyta and Chlorophyta

Main Physical Processes Affecting the Residence Times of a Micro-Tidal Estuary

Synechococcus dominance induced after hydrogen peroxide treatment of Microcystis bloom in the Caloosahatchee River, Florida

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