Sponsor
Portland State University. Environmental Sciences and Resources Ph. D. Program
First Advisor
John Rueter
Date of Publication
Summer 8-2-2018
Document Type
Dissertation
Degree Name
Doctor of Philosophy (Ph.D.) in Environmental Sciences and Resources
Department
Environmental Sciences and Resources
Language
English
Subjects
Cyanobacterial blooms -- Oregon -- Upper Klamath Lake, Aphanizomenon, Water quality
DOI
10.15760/etd.6398
Physical Description
1 online resource (viii, 161 pages)
Abstract
The ability to regulate buoyancy (sinking and floating) using cellular gas vesicles is a unique characteristic that allows many common bloom-forming cyanobacteria to accumulate at water surfaces and dominate systems. Typical control and management strategies include nutrient manipulation and phosphorus reduction, which are effective but do not reduce the advantage of buoyancy control. Since buoyancy control is based upon a mechanism that is driven by photosynthesis along with environmental conditions that trigger vesicle formation and ion exchange, buoyancy regulation can be influenced by manipulating extracellular conditions. In this study I manipulated extracellular conditions using wetland water and additions of potassium, sodium, and calcium in small-scale lab experiments and larger scale, near-lake containers with Aphanizomenon flos-aquae from Upper Klamath Lake, Oregon. The results indicate a target mixture of 10% wetland water reduces surface accumulation, increases cellular turgor pressure (a measure of the ability of gas vesicle forming cells to control buoyancy), and leads to fewer rafts at the surface of the water column. By adding ions at the same concentration as the target wetland mixture, similar results were found. This research represents the basis of a possible strategy for mitigating surface blooms of buoyant cyanobacteria in lakes using wetland water and/or ion additions that could be used in tandem with nutrient manipulation and phosphorus reduction.
Rights
In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
Persistent Identifier
https://archives.pdx.edu/ds/psu/26217
Recommended Citation
Rouhe, Arick Christopher, "Using Wetlands to Prevent the Surface Accumulation of Aphanizomenon flos-aquae from Upper Klamath Lake" (2018). Dissertations and Theses. Paper 4514.
https://doi.org/10.15760/etd.6398