Document Type

Thesis

Degree

Master of Science (MS)

Department

Biology

First Advisor's Name

Ronald Jones

First Advisor's Committee Title

Committee Chair

Second Advisor's Name

Rudolph Jaffe

Third Advisor's Name

Joel Trexler

Date of Defense

11-19-2000

Abstract

Human activities have altered the natural biogeochemical cycles of many elements to the extent that they are now treated as pollutants in many ecosystems. The Everglades of South Florida have been negatively impacted by two such elements, phosphorus and mercury. This study tested the hypothesis that increased phosphorus concentration contributes to conditions that lead to increased anaerobic microbial activity and microbial populations that might be linked to mercury methylation in Everglades peat soils. Soil was collected from a pristine Eleocharis marsh in the Shark River Slough area of Everglades National Park. Changes in microbial communities from aerobically-dominated to anaerobically-dominated processes were measured by reductions in redox potential, CO2 and CH4 evolution, enzyme activity, and bacterial density. The results indicate that in Everglades peat soil phosphorus level plays a significant role in shifting microbial communities from aerobically-dominated to anaerobically dominated, processes.

Identifier

FI14060872

Included in

Biology Commons

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