Low pH preempts bloom development of a toxic haptophyte

Prosser, Krista N.; Valenti, Theodore W.; Hayden, Natanya J.; Neisch, Michael T.; Hewitt, Natalie C.; Umphres, George D.; Gable, George M.; Grover, James P.; Roelke, Daniel L.; Brooks, Bryan W.

doi:10.1016/j.hal.2012.10.002

Cited by 24 publications

(8 citation statements)

References 62 publications

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“…In addition to temperature, pH appeared in several of the top models for the Brazos. Positive relationships between pH and golden alga toxicity have been demonstrated in the laboratory (Shilo and Aschner 1953;Valenti et al 2010) and in field experiments (Prosser et al 2012;Roelke et al 2012), and inclusion of pH with abundance increased cross-validation and sensitivity in this study. Although the reservoir capacity covariate model was ranked higher than the GAA-only model based on AIC C , cross-validation and sensitivity were similar.…”

Section: Vanlandeghem Et Almentioning

confidence: 65%

“…In the field, temperature and salinity have been shown to influence toxicity (Roelke et al 2012;Patiño et al 2014;VanLandeghem et al 2015a). Toxicity was also associated with pH in some (Prosser et al 2012;Roelke et al 2012) but not all (Patiño et al 2014) studies of the Brazos River basin, Texas. Some studies have indicated golden alga abundance and toxicity are positively correlated (Roelke et al 2012;VanLandeghem et al 2015a), whereas others have reported low toxicity associated with high golden alga abundance and vice versa (Hambright et al 2010;VanLandeghem et al 2015b).…”

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confidence: 99%

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Predicting the risk of toxic blooms of golden alga from cell abundance and environmental covariates

VanLandeghem

Denny²,

Patiño

2015

Limnol. Oceanogr. Methods

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Golden alga (Prymnesium parvum) is a toxic haptophyte that has caused considerable ecological damage to marine and inland aquatic ecosystems worldwide. Studies focused primarily on laboratory cultures have indicated that toxicity is poorly correlated with the abundance of golden alga cells. This relationship, however, has not been rigorously evaluated in the field where environmental conditions are much different. The ability to predict toxicity using readily measured environmental variables and golden alga abundance would allow managers rapid assessments of ichthyotoxicity potential without laboratory bioassay confirmation, which requires additional resources to accomplish. To assess the potential utility of these relationships, several a priori models relating lethal levels of golden alga ichthyotoxicity to golden alga abundance and environmental covariates were constructed. Model parameters were estimated using archived data from four river basins in Texas and New Mexico (Colorado, Brazos, Red, Pecos). Model predictive ability was quantified using cross-validation, sensitivity, and specificity, and the relative ranking of environmental covariate models was determined by Akaike Information Criterion values and Akaike weights. Overall, abundance was a generally good predictor of ichthyotoxicity as cross validation of golden alga abundance-only models ranged from 80% to 90% (leave-one-out cross-validation). Environmental covariates improved predictions, especially the ability to predict lethally toxic events (i.e., increased sensitivity), and top-ranked environmental covariate models differed among the four basins. These associations may be useful for monitoring as well as understanding the abiotic factors that influence toxicity during blooms.

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Section: Vanlandeghem Et Almentioning

confidence: 65%

mentioning

confidence: 99%

Predicting the risk of toxic blooms of golden alga from cell abundance and environmental covariates

VanLandeghem

Denny²,

Patiño

2015

Limnol. Oceanogr. Methods

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“…The increased pH levels after the introduction of algae were not significantly different, but the cell concentrations that the fish were exposed to were significantly different. It should be noted that a higher pH result in increased toxicity was caused by P. parvum [40,41]. A response elicited by the cell concentration alone should be more pronounced during the R. salina experiments as the fish exposed to R. salina experienced a higher concentration of algal cells than fish exposed to P. parvum (mean ± SD; 5.6 × 10 4 ± 6.2 × 10 4 cells mL −1 ).…”

Section: Discussionmentioning

confidence: 99%

Respiratory Physiology of European Plaice (Pleuronectes platessa) Exposed to Prymnesium parvum

Bergsson

Andersen

Svendsen

et al. 2019

Fishes

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During the last century, the blooms of the toxic haptophyte Prymnesium parvum have been responsible for massive fish kills in both aquaculture and wild populations. Despite decades of research, the ichthyotoxic properties of P. parvum, and how this alga affects fish, is still debated. Using a novel device to measure the respirometry, ventilation volume, ventilation frequency, oxygen extraction, and oxygen consumption of undisturbed European plaice (Pleuronectes platessa) were acquired during exposure to two algal species as well as hypoxia. Fourteen fish (258 ± 44 g) were initially exposed to severe hypoxia and left to recover for at least 48 h. Half of these fish were then exposed to known harmful concentrations of P. parvum (median ± standard deviation (SD); 2.6 × 10 5 ± 0.6 × 10 5 cells mL −1 ), while the remaining half were exposed to the non-toxic alga Rhodomonas salina (median ± SD; 3.2 × 10 5 ± 0.7 × 10 5 cells mL −1 ). During exposure to severe hypoxia, all of the fish were able to maintain oxygen consumption by increasing the ventilation volume. The results from fish that were exposed to P. parvum showed a significant decrease in oxygen extraction (median ± SD; 52.6 ± 6.9 percentage points) from pre-exposure to the end of the experiment, as opposed to fish exposed to R. salina, which were unaffected. These results indicate that suffocation affects the European plaice when exposed to P. parvum. The observed severe decrease in oxygen extraction can be ascribed to either damage of the gill epithelia or increased mucus secretion on the gills, as both would limit the transfer of oxygen, and both have been observed.

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“…Prosser et al (2012) report that toxic blooms of P. parvum occurred at high pH (8.5) but not at pH of 7-7.5. Prosser et al (2012) report that toxic blooms of P. parvum occurred at high pH (8.5) but not at pH of 7-7.5.…”

Section: Ecology and Distributionmentioning

confidence: 94%

Haptophyte Algae

Nicholls¹

2015

Freshwater Algae of North America

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Low pH preempts bloom development of a toxic haptophyte

Cited by 24 publications

References 62 publications

Predicting the risk of toxic blooms of golden alga from cell abundance and environmental covariates

Predicting the risk of toxic blooms of golden alga from cell abundance and environmental covariates

Respiratory Physiology of European Plaice (Pleuronectes platessa) Exposed to Prymnesium parvum

Haptophyte Algae

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