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Male flowers of Halophila Engelmanni: description and flowering ecology
Title
Male flowers of Halophila Engelmanni: description and flowering ecology.
Creator
Short, F. T., Cambridge, M. L., Harbor Branch Oceanographic Institute
Date Issued
1984
PURL
http://purl.flvc.org/FCLA/DT/3331856
Subject Headings
Halophila, Hydrocharitaceae, Flowers
Format
Document (PDF)
QUANTITATIVE COMPARISON OF THE EPIFAUNA ON THALASSIA TESTUDINUM KONIG IN THREE HYDROGRAPHICALLY DISTINCT AREAS IN SOUTHERN FLORIDA
Title
A QUANTITATIVE COMPARISON OF THE EPIFAUNA ON THALASSIA TESTUDINUM KONIG IN THREE HYDROGRAPHICALLY DISTINCT AREAS IN SOUTHERN FLORIDA.
Creator
WALESKY, RICHARD EDWARD, Florida Atlantic University
Abstract/Description
The invertebrate macrofauna and algal epiphytes occurring on Thalassia in three hydrographically distinct areas in southern Florida were sampled during 14 June-21 June, 1974. A total of 178 invertebrate species was collected. The dominant non-colonial invertebrate taxa were Amphipoda, Isopoda, Mollusca, Polychaeta, and Tanaidacea. These groups included 93.8% of the fauna and 70.4% of the non-colonial invertebrate species. A relatively high faunal homogeneity was observed on each site....
Show moreThe invertebrate macrofauna and algal epiphytes occurring on Thalassia in three hydrographically distinct areas in southern Florida were sampled during 14 June-21 June, 1974. A total of 178 invertebrate species was collected. The dominant non-colonial invertebrate taxa were Amphipoda, Isopoda, Mollusca, Polychaeta, and Tanaidacea. These groups included 93.8% of the fauna and 70.4% of the non-colonial invertebrate species. A relatively high faunal homogeneity was observed on each site. Turbidity and the abundance of algal epiphytes were important environmental factors affecting the observed differences in the composition and density of the epifauna between sites. Similarities in diversity (H') between Chicken Key (2.75), Lake Surprise (2.89) and San Carlos Bay (2.93), were presumably due to equivalent substrates with similar degrees of environmental instability. The Thalassia epifauna showed a high degree of parallelism with the Zostera marina epifauna.
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Date Issued
1976
PURL
http://purl.flvc.org/fcla/dt/13831
Subject Headings
Turtle grass, Hydrocharitaceae, Marine animals, Epiphytes
Format
Document (PDF)
Sulfide effects on Thalassia testudinum carbon balance and adenylate energy charge
Title
Sulfide effects on Thalassia testudinum carbon balance and adenylate energy charge.
Creator
Erskine, James M., Florida Atlantic University, Koch, Marguerite
Abstract/Description
Sulfide accumulation in carbonate sediments of tropical seagrass communities may be responsible for widespread die-back of Thalassia testudinum in Florida Bay. Root hydroponic chambers were used to determine the effects of below-ground exposure to 0.0, 2.0, 4.0, 6.0, and 10.0 mM sulfides. T. testudinum ATP, energy charge, photosynthesis and growth responses were determined after 48 h under light saturation. Root ATP, energy charge and adenylate ratios were all significantly reduced (P
Show moreSulfide accumulation in carbonate sediments of tropical seagrass communities may be responsible for widespread die-back of Thalassia testudinum in Florida Bay. Root hydroponic chambers were used to determine the effects of below-ground exposure to 0.0, 2.0, 4.0, 6.0, and 10.0 mM sulfides. T. testudinum ATP, energy charge, photosynthesis and growth responses were determined after 48 h under light saturation. Root ATP, energy charge and adenylate ratios were all significantly reduced (P < 0.05) when exposed to 2.0-10.0 mM sulfides. Leaf elongation rates declined by an average of 43% in the 2.0-6.0 mM treatments and 63% in the 10.0 mM treatment. Although root energy charge, ATP production and leaf elongation rates declined after sulfide exposure, concentrations up to 10.0 mM failed to produce visual signs of sulfide toxicity or mortality. Photosynthesis and leaf EC remained high after sulfide treatments, suggesting a resilience of T. testudinum to short-term sulfide exposure.
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Date Issued
1999
PURL
http://purl.flvc.org/fcla/dt/15672
Subject Headings
Adenylate cyclase, Hydrocharitaceae, Sulfates--Physiological effect, Photosynthesis
Format
Document (PDF)