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  • 1
    Electronic Resource
    Electronic Resource
    A comparative seasonal study of two populations of Hypnea musciformis from the East and West Coasts of Florida, USA I. Growth and chemistry (1980)
    Springer
    Marine biology 59 (1980), S. 151-156 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dry weight levels of the red alga Hypnea musciformis (Wulfen) Lamouroux from Atlantic and Gulf of Mexico coastal sites in florida, USA were lowest in the late winter and early spring, increasing through the summer and highest in the fall. There was a two-month lag in the Gulf coast population's dry weight pattern, indicating differing growth patterns. Chlorophyll a, phycoerythrin and phycoerythrin/chlorophyll a ratios were highest in the winter and lowest in the summer for both populations. Total pigment levels for H. musciformis from the Atlantic coast site were significantly greater than those of the Gulf coast. Protein and carbohydrate percentages were inversely related in both populations, with carbohydrate levels highest in summer and protein levels highest in winter. The Gulf coast population contained significantly more protein than the Atlantic coast plants. Carrageenan levels were highest in spring and lowest in fall, the Atlantic coast population generally had higher levels than the Gulf coast population. The differences in seasonal patterns and levels of the chemical constituents were reflected by distinct morphological characteristics for each population. The Atlantic coast population was larger, darker, more coarse in texture and possessed more crozier branch tips than the Gulf coast plants. These distinctions represent acclimitization responses that relate to habitat differences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396862
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A comparative seasonal study of two populations of Hypnea musciformis from the East and West Coasts of Florida, USA II. Photosynthetic and respiratory rates (1980)
    Springer
    Marine biology 59 (1980), S. 157-162 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Respiration rates of Hypnea musciformis (Wulfen) Lamouroux in Florida, USA, generally increased with increased temperature. Gulf coast H. musciformis respired at significantly higher rates than the Atlantic coast population, which exhibited a region of temperature independence between 24°–32°C. Respiration rates were highest in the fall and winter, during the periods of rapid growth. Respiration rates were lowest in the summer indicating a period of storage and low metabolism. Photosynthetic responses to various levels of light and temperature indicated that the Gulf coast population was more tolerant to high light intensities than the Atlantic coast population. Maximum photosynthetic responses for both populations occurred between 24° and 32°C which corresponds to the shallow slope region of the respiration-temperature curves. The results indicate that water temperature rather than light intensity is a significant factor in modifying seasonal photosynthetic capacities. The greatest seasonal variation in photosynthetic responses occurred at the light-temperature levels of highest responses while little seasonal variation was demonstrated at tolerance limits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396863
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    In vitro studies of the submerged angiospermRuppia maritima: Auxin and cytokinin effects on plant growth and development (1991)
    Springer
    Marine biology 110 (1991), S. 1-6 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Axenic tissue cultures ofRuppia maritima L. were established and propagated clonally in vitro from terminal rhizome segments collected from Tampa Bay, Florida, USA. Cultures were maintained in a base medium consisting of synthetic seawater supplemented with half-strength Murashige and Skoog salts and 1% sucrose at pH 5.6. The effects of five cytokins [6-furfurylaminopurine (kinetin), 6-benzylaminopurine (BAP), 2-isopentyladenine (2iP), 6-(4-hydroxy-3-methyl-but-2-enylamino) purine (zeatin), andn-phenyl-n′-1,2,3-thidiazol-5′yl urea (thidiazuron)] and one auxin [napthalene acetic acid (NAA)] on explant growth and development were investigated. Cytokinin additions resulted in a 3- to 4-fold increase in nodal production, branching, and biomass ofR. maritima after 12 wk in culture. Cultures responded in a dose-dependent manner to 2iP but exhibited broad dose-response curves to kinetin, BAP, zeatin, and thidiazuron. NAA addition resulted in increased leaf and internodal lengths, but reduced the number of leaves per node and the rhizome biomass. The addition of NAA almost completely suppressed root growth in media without cytokinins and had an antagonistic effect on nodal production and branching in cytokinin-supplemented media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313085
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Photosynthetic utilization of CO2(aq) and HCO 3 - in Thalassia testudinum (Hydrocharitaceae) (1993)
    Springer
    Marine biology 115 (1993), S. 373-380 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of total dissolved inorganic carbon (DIC), free carbon dioxide [CO2(aq)], and bicarbonate (HCO 3 - ) concentrations on net photosynthetic oxygen evolution of the marine angiosperm Thalassia testudinum Banks ex König collected from Biscayne Bay (1988) and from Tampa Bay (1990), Florida, USA, were examined. Rates of photosynthesis declined by 85% from pH 7.25 to 8.75 in buffered seawater media with constant DIC concentration (2.20 mM), suggesting a strong influence of CO2(aq) concentration. A plateau in the pH-response curve between pH 7.75 and 8.50 indicated possible utilization of HCO 3 - . Responses of photosynthesis measured in buffered seawater media of varying DIC concentrations (0.75 to 13.17 mM) and pH (7.8 to 8.61) demonstrated that photosynthesis is rate-limited at ambient DIC levels. Photosynthesis increased in media with increasing HCO 3 - concentrations but near-constant CO2(aq) levels, confirming HCO 3 - assimilation. Calculated half-saturation constants (K s )for CO2(aq) and HCO 3 - indicated a high affinity for the former [K s (CO2)=3 to 18 μM] and a much lower affinity for the latter [K s (HCO 3 - )=1.22 to 8.88 mM]. Calculated V max values for HCO 3 - were generally higher than those for CO2(aq), suggesting relatively efficient HCO 3 - utilization, despite the apparent low affinity for this carbon form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349834
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    Paper (German National Licenses)
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