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  • 1
    Electronic Resource
    Electronic Resource
    A Model to Estimate Potential Submersed Aquatic Vegetation Habitat Based on Studies in Lake Pontchartrain, Louisiana (2005)
    Oxford, UK; Malden, USA : Blackwell Science Inc
    Restoration ecology 13 (2005), S. 0 
    Details
    ISSN: 1526-100X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The depth distribution of submersed aquatic vegetation (SAV) was studied in Lake Pontchartrain, Louisiana, to develop a model to predict changes in SAV abundance from changes in environmental quality. We conducted annual line-intercept surveys from 1997 through 2001 and monitored monthly photosynthetically active radiation at four sites with different shoreface slopes. The following relationships between SAV distribution and environmental factors were used as model parameters: (1) water clarity controls SAV colonization depth; (2) fluctuation in annual mean water level and wave mixing determines SAV minimum colonization depth; and (3) site differences in SAV areal coverage under the comparable water quality conditions are due to shoreface slope differences. These parameters expressed as mathematical components of the model are as follows: mean water clarity determines SAV colonization depth (Zmax= 2.3/Kd); mean water level and wave mixing controls SAV minimum depth (Zmin= 0.3 m); and shoreface slope angle (θ) determines the distance from Zmin to Zmax. The equation developed for the potential SAV habitat (PSAV) model is PSAV = (2.3 − 0.3 ×Kd)/(sinθ×Kd). The model was validated by comparing empirical values from the dataset to values predicted by the model. Although the model was developed to predict the PSAV in Lake Pontchartrain, it can be applied to other coastal habitats if local SAV light requirements are substituted for Lake Pontchartrain values. This model is a useful tool in selecting potential restoration sites and in predicting the extent of SAV habitat gain after restoration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1526-100X.2005.00080.x
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  • 2
    Electronic Resource
    Electronic Resource
    Adsorption and concentration of dissolved carbon-14 DDT by coloring colloids in surface waters (1972)
    s.l. : American Chemical Society
    Environmental science & technology 6 (1972), S. 1033-1035 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es60071a011
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Freshwater sponges (Porifera: Spongillidae) from Panamá (1990)
    Springer
    Hydrobiologia 194 (1990), S. 203-205 
    Details
    ISSN: 1573-5117
    Keywords: fresh-water sponges ; Spongillidae ; Panamá ; Central America
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Aquatic habitats in the Republic of Panamá were examined for freshwater sponges during 21 Feb. to 6 March 1986. Eunapius carteri, Trochospongilla leidyi, and Trochospongilla horrida were found in the northern canal area. This is the first report of E. carteri and T. horrida from Central America, and the first record of E. carteri from the Western Hemisphere. Taxonomic characters used to distinguish T. leidyi and T. horrida from similar South American species are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007120
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  • 4
    Electronic Resource
    Electronic Resource
    A continuous-flow system for growing fresh-water sponges in the laboratory (1981)
    Springer
    Hydrobiologia 79 (1981), S. 255-259 
    Details
    ISSN: 1573-5117
    Keywords: fresh-water sponges ; sponge culture ; chemostat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two fresh-water sponge species, Ephydatia fluviatilis and Spongilla alba, were grown from gemmules in the laboratory. A system incorporating a continuous flow of filtered habitat water and live bacteria from a chemostat culture as a food source were used. Experiments with this system demonstrated a relationship between the concentration of bacteria and sponge growth rate. Because the continuous flow of water eliminates the effects of substances released by sponges and growth rate can be predicted for a given bacterial concentration, this system permits experimental studies which were not feasible in the past.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006321
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  • 5
    Electronic Resource
    Electronic Resource
    The effects of cadmium and mercury on gemmule formation and gemmosclere morphology in Ephydatia fluviatilis (Porifera : Spongillidae) (1981)
    Springer
    Hydrobiologia 76 (1981), S. 145-148 
    Details
    ISSN: 1573-5117
    Keywords: Ephydatia fluviatilis ; Spongillidae ; Porifera ; Metal Pollution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A laboratory study of the effects of cadmium and mercury on the freshwater sponge, Ephydatia fluviatilis, was conducted. Sponge cuttings were exposed to concentrations of cadmium or mercury which ranged from 1.000 to 0.001 ppm for one month. The responses exhibited by the specimens resulted in four groups characterized as follows: sponge colony survived and produced gemmules with normal gemmoscleres; sponge colony survived and produced gemmules with malformed gemmoscleres; sponge colony survived but did not gemmulate; sponge colony died. A direct discriminant functions analysis of the four sponge groups, metal concentrations and other chemical data established a highly significant correlation between increasing metal concentrations and amount of damage to the sponge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014045
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  • 6
    Electronic Resource
    Electronic Resource
    Ecomorphic variation in gemmoscleres of Ephydatia fluviatilis Linnaeus (Porifera: Spongillidae) with comments upon its systematics and ecology (1974)
    Springer
    Hydrobiologia 44 (1974), S. 337-347 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An ecological and taxonomic investigation of Ephydatia fluviatilis was conducted. E. fluviatilis was found in alkaline fresh waters and slightly brackish waters. Extreme variation was found in the gemmoscleres of E. fluviatilis from different Louisiana habitats. The variation appeared to be ecomorphic and related to the chemical characteristics of the habitats. Laboratory investigations, based on the formation of gemmules by sponges maintained under different conditions were used to determine the nature and extent of this variation. The experimental studies demonstrated that gemmoscleres of different forms can develop in sponges from the same locality if exposed to different environmental conditions and that Ephydatia robusta (Potts, 1887) as revised by Penney & Racek (1968), is synonymous with Ephydatia fluviatilis. Results of these studies demonstrate the difficulty of using such characteristics for the recognition of species, subspecies and other evolutionary units.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00036300
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    Paper (German National Licenses)
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