2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/20/2019 | 3:15 PM - 3:30 PM | MORE BIOLOGICALLY AVAILABLE PHOSPHOROUS, LESS EUKARYOTIC GRAZER POPULATIONS, AND WARMER TEMPERATURES MAY INTENSIFY HABS ON UTAH LAKE | 151 ABC
MORE BIOLOGICALLY AVAILABLE PHOSPHOROUS, LESS EUKARYOTIC GRAZER POPULATIONS, AND WARMER TEMPERATURES MAY INTENSIFY HABS ON UTAH LAKE
The inception and persistence of harmful algal blooms (HABs) is linked to the appropriate conditions for a given cyanobacteria to become abundant. Certain cyanobacterial species may exploit nutrients, thrive under seasonal fluctuations in physicochemical lake conditions, and/or escape predation of eukaryotic grazers. To identify specific environmental conditions promoting individual HAB species, we tracked shifts in abundance of major cyanobacterial species in response to fluctuations in nutrient availability, top-down grazer pressure, and lake chemistry weekly through the spring and summer (May 5th – Oct 10th) of 2017 across seven sites on Utah Lake, USA. We found that 11 cyanobacterial operational taxonomic units across five genera (Aphanizomenon, Anabaena, Synechococcus, Microcystis, Planktothrix) contributed to HABs constituting anywhere from 4% to almost 50% of the total bacterial community in surface waters. Based on linear mixed effect models, HAB contributors were triggered by species-specific interactions with light availability, total Phosphorous, total dissolved Phosphorous, soluble reactive Phosphorous, water temperature, and three grazers (Genus: Copepoda, Cyclopoida, and Diplostraca). ). Our results indicate that HAB contributors are triggered by more biologically available phosphorus and higher temperatures that stimulate eukaryotic grazer populations.
- Eutrophication
- Nutrients
- Microbial
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Presenters/Authors
Scott Collins
(), Brigham Young University, scottcollins333@gmail.com;
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Erin Jones
(), Brigham Young University, erinfjones3@gmail.com;
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Neil Hansen
(), Brigham Young University, neil_hansen@byu.edu ;
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Benjamin Abbott
(), Brigham Young University, Department of Plant and Wildlife Sciences, benabbott@byu.edu;
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Greg Carling
(), Brigham Young University, greg.carling@byu.edu;
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Michelle Baker
(), Utah State University, michelle.baker@usu.edu;
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Zachary Aanderud
(), Brigham Young University, zachary_aanderud@byu.edu;
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