Results 181 to 190 of about 4,825 (202)

N₂ fixation in the rhizosphere of Thalassia testudinum

Canadian Journal of Microbiology, 1980
N2 fixation (C2H2 reduction) associated with the roots, rhizomes, and sediments (rhizosphere cores) of the seagrass Thalassia testudinum was measured at sites in South Florida (Soldier Key, Biscayne Bay) and the Bahamas (Bimini Harbor). Rates of C2H2 reduction were higher in anaerobic than in aerobic assays and were linear for several hours after an ...
D G, Capone, B F, Taylor
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Thalassia testudinum productivity: A field comparison of measurement methods

Marine Biology, 1976
A 6-day in situ comparison between the Wetzel inorganic 14C uptake and Zieman leaf-biomass techniques for measuring net primary production rates in the seagrass Thalassia testudinum was performed in the northeastern Gulf of Mexico. Measurement differences between the two methods were insignificant when the 14C uptake technique was corrected for ...
H. F. Bittaker, R. L. Iverson
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Spectral reflectance of Thalassia testudinum with varying depths

IEEE International Geoscience and Remote Sensing Symposium, 2003
Seagrasses are an important component in the marine ecosystem, and also a vulnerable resource subject to environmental change. Satellite and airborne remote sensing has been applied in monitoring and mapping seagrasses. One research issue from a remote sensing perspective is the spectral impact of water column depths since seagrasses normally grow in ...
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Observations on the reproductive ecology of Thalassia testudinum (hydrocharitaceae)

Aquatic Botany, 1981
Abstract A phenological inversion in Thalassia testudinum Banks ex Konig was indicated by the presence of early fruit stage in midwinter. Further observations in Januarary 1979 detected early reproductive bud presence, and 44% of the short-shoots examined were reproductive.
Mark D. Moffler, Michael J. Durako, William F. Grey   +2 more
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Occurrence of intracellular crystals in leaves of Thalassia testudinum

Aquatic Botany, 2004
Abstract Refractive, rhomboidal, intracellular crystals were identified in leaves of Thalassia testudinum Banks ex Konig (turtlegrass) from the Bahamas (Lee Stocking Island); Florida (Key Largo and Key West); and Texas (Laguna Madre). At all four collection sites, crystals were present in leaves of all ages and in most but not all epidermal cells ...
Fred C. Dobbs, Richard C. Zimmerman, Lisa A. Drake   +2 more
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AXENIC CULTURE OF THALASSIA TESTUDINUM BANKS EX KÖNIG (HYDROCHARITACEAE)

American Journal of Botany, 1984
Cultures of Thalassia testudinum were established and maintained in the absence of other detectable organisms. Axenic cultures were initiated using surface sterilized seeds which were aseptically dissected from surface sterilized fruits. Seedlings were cultured in 75‐ml (25‐mm × 200‐mm) culture tubes containing 30 ml of rooting substrate and 40 ml of ...
Mark D. Moffler, Michael J. Durako
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The water economy of the sea grass Thalassia testudinum

Marine Biology, 1971
The osmotic values in the leaves of Thalassia testudinumBanks ex Konig, collected from the natural habitat, were found to be 32 atm; the relative transpiration was 100%. Electronmicroscopical analysis of the cuticle reveals many perforations. The critical sublethal water deficit lies near 65%.
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Phosphorus uptake kinetics of a dominant tropical seagrass Thalassia testudinum

Aquatic Botany, 2003
Although nitrogen is primarily the dominant nutrient limiting seagrass production in temperate estuaries, phosphorus (P) limitation can be important in tropical carbonate-dominated seagrass systems. While nitrogen uptake kinetics of seagrasses are moderately well established, very limited data exist on the dynamics of P-uptake.
Amy F Gras, Marguerite S Koch, Christopher J Madden   +2 more
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Carbonate mud; production by epibiont growth on Thalassia testudinum

Journal of Sedimentary Research, 1970
ABSTRACT Epibiotic growth of coralline red algae and serpulid worms on the marine turtle grass Thalassia testudinum is sufficient to produce carbonate mud at rates comparable to the rates of accumulation of ancient platform carbonates.
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Nitrogen fixation (acetylene reduction) in the phyllosphere of Thalassia testudinum

Marine Biology, 1977
N2 fixation (C2H2 reduction) associated with the leaves of the sea grass Thalassia testudinum was investigated at 5 sites in South Florida (Biscayne Bay) and one site in the Bahamas (Bimini Harbor). Significant activities were correlated with the occurrence of a heterocystous blue-green alga (Calothrix sp.) on the leaves.
D. G. Capone, B. F. Taylor
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