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Biomonitoring of hypoxia and sulfide stress in three sub-tropical seagrasses

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Date Issued:
2010
Summary:
Hypoxia and sulfide exposure, increased using glucose, are considered major environmental stressors in seagrass communities. Quantum efficiency, total soluble protein and catalase activity were quantified to evaluate the applicability of each of these bioindicators to detect environmental stress in three tropical seagrass species, Thalassia testudinum (Banks ex Kèoenig), Halodule wrightii (Ascherson) and Syringodium filiforme (Kuetz). Hypoxia + sulfide treatments significantly decreased the quantum efficiency of all three species, but showed no response in protein and catalase activity. Although no treatment effect was found, catalase activity was enhanced in T. testudinum leaves and H. wrightii roots relative to other tissues, while S. filiforme showed no location-specific catalase activity. These results indicate that quantum efficiency is a more sensitive indicator than protein and catalase activity to hypoxia and sulfide stress in seagrasses.
Title: Biomonitoring of hypoxia and sulfide stress in three sub-tropical seagrasses.
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Alternative Title: Environmental stress biomonitoring in sub-tropical seagrasses.
Name(s): Irwin, Connor.
Charles E. Schmidt College of Science
Department of Biological Sciences
Type of Resource: text
Genre: Electronic Thesis Or Dissertation
Date Issued: 2010
Publisher: Florida Atlantic University
Physical Form: electronic
Extent: vii, 54 p. : ill.
Language(s): English
Summary: Hypoxia and sulfide exposure, increased using glucose, are considered major environmental stressors in seagrass communities. Quantum efficiency, total soluble protein and catalase activity were quantified to evaluate the applicability of each of these bioindicators to detect environmental stress in three tropical seagrass species, Thalassia testudinum (Banks ex Kèoenig), Halodule wrightii (Ascherson) and Syringodium filiforme (Kuetz). Hypoxia + sulfide treatments significantly decreased the quantum efficiency of all three species, but showed no response in protein and catalase activity. Although no treatment effect was found, catalase activity was enhanced in T. testudinum leaves and H. wrightii roots relative to other tissues, while S. filiforme showed no location-specific catalase activity. These results indicate that quantum efficiency is a more sensitive indicator than protein and catalase activity to hypoxia and sulfide stress in seagrasses.
Identifier: 702126669 (oclc), 2976445 (digitool), FADT2976445 (IID), fau:3580 (fedora)
Note(s): by Connor Irwin.
Title on signature page (p. ii) : Environmental stress biomonitoring in sub-tropical seagrasses.
Thesis (M.S.)--Florida Atlantic University, 2010.
Includes bibliography.
Electronic reproduction. Boca Raton, Fla., 2010. Mode of access: World Wide Web.
Subject(s): Plant physiology
Environmental management
Seagrasses -- Habitat -- Environmental aspects
Sulfites -- Physiological effect
Marine ecology
Persistent Link to This Record: http://purl.flvc.org/FAU/2976445
Use and Reproduction: http://rightsstatements.org/vocab/InC/1.0/
Host Institution: FAU