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Effects of Light, Nutrients, and Sal...

Howard-Parker, Bethanie Brooke.

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Effects of Light, Nutrients, and Salts on Microbial Biofilm Productivity and Detrital Processing in Aquatic Mesocosms.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Effects of Light, Nutrients, and Salts on Microbial Biofilm Productivity and Detrital Processing in Aquatic Mesocosms./
作者:	Howard-Parker, Bethanie Brooke.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	98 p.
附註:	Source: Masters Abstracts International, Volume: 81-11.
Contained By:	Masters Abstracts International81-11.
標題:	Aquatic sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27960696
ISBN:	9798645424374

Effects of Light, Nutrients, and Salts on Microbial Biofilm Productivity and Detrital Processing in Aquatic Mesocosms.
Howard-Parker, Bethanie Brooke.

Effects of Light, Nutrients, and Salts on Microbial Biofilm Productivity and Detrital Processing in Aquatic Mesocosms. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 98 p.

Source: Masters Abstracts International, Volume: 81-11.

Thesis (M.S.)--University of Arkansas, 2020.

This item must not be sold to any third party vendors.

Anthropogenic activities associated with urbanization, agriculture, and resource extraction continue to increase to support increasing needs of the growing population. These activities increase the amounts of pollutants entering freshwater streams and put aquatic ecosystems at structural and functional risk. Aquatic microbes play an important role in detrital processing in streams as a key linkage in moving carbon from detrital stocks into aquatic food webs. My research investigates the effects of light, nutrients, and salts on detrital microbes and decomposition in freshwaters using a mesocosm approach. In chapter one, I modified a current priming effect (PE) hypothesis model to include light level, proposed a method for calculating quantitative values for potential PEs, and tested the PE hypothesis according to my model and proposed calculation methodology. I manipulated light level [ambient (full light available) or 19% of ambient] and phosphorus [P; added 10, 100, or 500μg/L dissolved inorganic P (DIP)], and measured the effects on autotrophic (algae) and heterotrophic (fungi) detrital microbial communities and decomposition of Quercus stellata (Post Oak) leaf litter in a 150-day experiment. The results illustrate the importance of considering light levels, nutrient ratios (rather than individual nutrients), and detrital recalcitrant organic matter (ROM) components in further PE model development and provide evidence that priming effects occur in aquatic systems. In chapter two, I compare two similar experiments investigating potential subsidy-stress responses of autotrophic (algae) and heterotrophic (fungi and bacteria) detrital microbial communities and decomposition of Liquidambar styraciflua (Sweet Gum) leaf litter to sub-lethal increases in two common sodium (Na) salts (i.e. NaCl and NaHCO3). Treatments included ambient streamwater (SW; ~3mg/L Na) and NaCl and NaHCO3 amended SW with target concentrations of 16, 32, and 64 mg/L Na salts. Experiment A was subjected to day/night light cycles and temperatures according to the season and ran for 134 days. Experiment B was subjected to 12hr light/dark cycles at a constant 4.5°C for 135 days. The data suggest low-level Na salt increases likely affect detrital biofilms and decomposition before toxicity occurs, may be ion- and species-specific, and temperature plays a significant role in the magnitude of these effects.

ISBN: 9798645424374Subjects--Topical Terms:

3174300
Aquatic sciences.
Subjects--Index Terms:

Anthropogenic pollutants

Effects of Light, Nutrients, and Salts on Microbial Biofilm Productivity and Detrital Processing in Aquatic Mesocosms.
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