Ammonium treatments to suppress toxic blooms of Prymnesium parvum in a subtropical lake of semi-arid climate: Results from in situ mesocosm experiments

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

doi:10.1016/j.watres.2013.05.001

Cited by 11 publications

(5 citation statements)

References 40 publications

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“…Ciliates have been shown to be an important source of nitrogen for other mixotrophic protists in nitrogen-limited environments (Bockstahler and Coats, 1993 ; Smalley and Coats, 2002 ). This hypothesis is also consistent with previous findings that have reported greater toxicity of P. parvum under nitrogen or phosphate limitation (Johansson and Granéli, 1999 ; Granéli and Johansson, 2003 ; Hambright et al, 2014 ), and suppression of toxicity when high doses of ammonium are provided (Grover et al, 2007 , 2013 ).…”

Section: Discussionsupporting

confidence: 92%

Gene expression in the mixotrophic prymnesiophyte, Prymnesium parvum, responds to prey availability

et al. 2015

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The mixotrophic prymnesiophyte, Prymnesium parvum, is a widely distributed alga with significant ecological importance. It produces toxins and can form ecosystem disruptive blooms that result in fish kills and changes in planktonic food web structure. However, the relationship between P. parvum and its prey on the molecular level is poorly understood. In this study, we used RNA-Seq technology to study changes in gene transcription of P. parvum in three treatments with different microbial populations available as potential prey: axenic P. parvum (no prey), bacterized P. paruvm, and axenic P. parvum with ciliates added as prey. Thousands of genes were differentially expressed among the three treatments. Most notably, transcriptome data indicated that P. parvum obtained organic carbon, including fatty acids, from both bacteria and ciliate prey for energy and cellular building blocks. The data also suggested that different prey provided P. parvum with macro- and micro-nutrients, namely organic nitrogen in the form of amino acids from ciliates, and iron from bacteria. However, both transcriptomic data and growth experiments indicated that P. parvum did not grow faster in the presence of prey despite the gains in nutrients, although algal abundances attained in culture were slightly greater in the presence of prey. The relationship between phototrophy, heterotrophy and growth of P. parvum is discussed.

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Section: Discussionsupporting

confidence: 92%

Gene expression in the mixotrophic prymnesiophyte, Prymnesium parvum, responds to prey availability

et al. 2015

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“…One potential strategy for golden alga control in large reservoirs is the manipulation of water quality to create conditions unfavorable to golden alga. For example, golden alga toxicity was reduced in limnocorrals following an application of fertilizer (ammonia chloride) to alleviate nitrogen‐limited conditions that favor toxicity (Grover et al ., ). Other water quality characteristics, such as salinity and pH, can also influence golden alga bloom formation and toxicity, but these relationships may also vary considerably among basins (e.g., Hambright et al ., ; Roelke et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Associations between Water Physicochemistry andPrymnesium parvumPresence, Abundance, and Toxicity in West Texas Reservoirs

VanLandeghem

Farooqi

Southard

et al. 2014

J American Water Resour Assoc

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Toxic blooms of golden alga (Prymnesium parvum) have caused substantial ecological and economic harm in freshwater and marine systems throughout the world. In North America, toxic blooms have impacted freshwater systems including large reservoirs. Management of water chemistry is one proposed option for golden alga control in these systems. The main objective of this study was to assess physicochemical characteristics of water that influence golden alga presence, abundance, and toxicity in the Upper Colorado River basin (UCR) in Texas. The UCR contains reservoirs that have experienced repeated blooms and other reservoirs where golden alga is present but has not been toxic. We quantified golden alga abundance (hemocytometer counts), ichthyotoxicity (bioassay), and water chemistry (surface grab samples) at three impacted reservoirs on the Colorado River; two reference reservoirs on the Concho River; and three sites at the confluence of these rivers. Sampling occurred monthly from January 2010 to July 2011. Impacted sites were characterized by higher specific conductance, calcium and magnesium hardness, and fluoride than reference and confluence sites. At impacted sites, golden alga abundance and toxicity were positively associated with salinity-related variables and blooms peaked at~10°C and generally did not occur above 20°C. Overall, these findings suggest management of land and water use to reduce hardness or salinity could produce unfavorable conditions for golden alga. (KEY TERMS: algae; aquatic ecology; harmful algal blooms; watershed management.) VanLandeghem, Matthew M., Mukhtar Farooqi, Greg M. Southard, and Reynaldo Patiño, 2015. Associations between Water Physicochemistry and Prymnesium parvum Presence, Abundance, and Toxicity in West Texas Reservoirs.

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“…Other proposed nutrient manipulation strategies include fertilization. Fertilization with inorganic nutrients is commonly used in hatchery ponds to reduce golden alga toxicity (e.g., Kurten et al ., , , ), and has been suggested for use in reservoirs (Roelke et al ., ; Grover et al ., ). In the UCR, golden alga abundance and toxicity were much lower at high inorganic nitrogen concentrations, indicating inorganic nitrogen fertilization might be beneficial to impacted reservoirs.…”

Section: Discussionmentioning

confidence: 97%

“…A proposed option to combat golden alga in reservoirs is the application of algaecides or fertilizers (i.e., nitrogen and phosphorus additions) in coves to provide refuge areas for aquatic biota (Southard et al ., ; Grover et al ., ). The use of algaecides and fertilizers has been successful at mitigating golden alga in hatchery ponds (Kurten et al ., , ), but these methods have not been thoroughly tested in larger water bodies.…”

Section: Introductionmentioning

confidence: 97%

Spatiotemporal Associations of Reservoir Nutrient Characteristics and the Invasive, Harmful Alga Prymnesium parvum in West Texas

VanLandeghem

Farooqi

Southard

et al. 2014

J American Water Resour Assoc

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Golden alga (Prymnesium parvum) is a harmful alga that has caused ecological and economic harm in freshwater and marine systems worldwide. In inland systems of North America, toxic blooms have nearly eliminated fish populations in some systems. Modifying nutrient profiles through alterations to land or water use may be a viable alternative for golden alga control in reservoirs. The main objective of this study was to improve our understanding of the nutrient dynamics that influence golden alga bloom formation and toxicity in west Texas reservoirs. We examined eight sites in the Upper Colorado River basin, Texas: three impacted reservoirs that have experienced repeated golden alga blooms; two reference reservoirs where golden alga is present but nontoxic; and three confluence sites downstream of the impacted and reference sites. Total, inorganic, and organic nitrogen and phosphorus and their ratios were quantified monthly along with golden alga abundance and ichthyotoxicity between December 2010 and July 2011. Blooms persisted for several months at the impacted sites, which were characterized by high organic nitrogen and low inorganic nitrogen. At impacted sites, abundance was positively associated with inorganic phosphorus and bloom termination coincided with increases in inorganic nitrogen and decreases in inorganic phosphorus in late spring. Management of both inorganic and organic forms of nutrients may create conditions in reservoirs unfavorable to golden alga. (KEY TERMS: algae; aquatic ecology; environmental impacts; nutrients.) VanLandeghem, Matthew M., Mukhtar Farooqi, Greg M. Southard, and Reynaldo Patiño, 2015. Spatiotemporal Associations of Reservoir Nutrient Characteristics and the Invasive, Harmful Alga Prymnesium parvum in West Texas.

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Ammonium treatments to suppress toxic blooms of Prymnesium parvum in a subtropical lake of semi-arid climate: Results from in situ mesocosm experiments

Cited by 11 publications

References 40 publications

Gene expression in the mixotrophic prymnesiophyte, Prymnesium parvum, responds to prey availability

Gene expression in the mixotrophic prymnesiophyte, Prymnesium parvum, responds to prey availability

Associations between Water Physicochemistry andPrymnesium parvumPresence, Abundance, and Toxicity in West Texas Reservoirs

Spatiotemporal Associations of Reservoir Nutrient Characteristics and the Invasive, Harmful Alga Prymnesium parvum in West Texas

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