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  • 1
    Electronic Resource
    Electronic Resource
    A photographic method for estimating chlorophyll in periphyton on artificial substrata (1999)
    Springer
    Aquatic ecology 33 (1999), S. 325-330 
    Details
    ISSN: 1573-5125
    Keywords: Chla ; non-destructive estimation ; periphyton ; time-series
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The collection of time-series of periphyton biomass is a difficult task due to the destructive nature of the standard methods. A non-destructive method based on photography and digitalization, for the estimation of Chla of periphyton colonizing artificial substrata is presented. The standard spectrophotometric method was used to obtain a calibration curve. The relative errors of the proposed method were similar to those of other published methods. The photographic method should be used when a large quantity of samples from the same community is needed and a high precision on the individual measurement is not required.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009934626188
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A new model for periphyton growth in running waters (1995)
    Springer
    Hydrobiologia 299 (1995), S. 215-218 
    Details
    ISSN: 1573-5117
    Keywords: model ; periphyton ; equilibria ; catastrophe theory ; running waters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A new model for biofilm growth is based on a logistic approach but accounts for detachment of the biofilm by the running water and the existence of a threshold point for growth. Above a critical current velocity, development of periphyton is not stable. A stability analysis shows the existence of a fold catastrophe in the model and the amplification of water velocity fluctuations by the algal biomass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00767328
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Factors influencing biomass and nutrient content of the submersed macrophyte Egeria densa Planch. in a pampasic stream (1996)
    Springer
    Hydrobiologia 341 (1996), S. 21-26 
    Details
    ISSN: 1573-5117
    Keywords: submersed macrophytes ; nutrients ; biomass ; sediment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We identified factors influencing biomass and nutrient content in E. densa in an enriched pampean stream of Argentina. Physical (current velocity, temperature), chemical (pH, conductivity, dissolved oxygen, nutrient content in water and sediments), and biological variables (biomass and nutrient content of E. densa, biomass of periphyton and other macrophytes) were estimated at each sampling occasion, and mean monthly values estimated. Biomass and nutrient content in E. densa were correlated with these physical-chemical and biological variables. Biomass was positively correlated with ammonium in stream water (P〈0.05) and sediment total nitrogen (P〈0.01). Nitrogen showed a positive relationship with ammonium (P〈0.01), and a negative one with nitrate and periphyton biomass (P〈0.05). Phosphorus was positively correlated with soluble reactive phosphorus (P〈0.01). The growth of other macrophyte species in the stream seemed to influence E. densa biomass, probably through competition for light. Current velocity was low and not significantly related with E. densa biomass, however, a flood at the beginning of the study washed the macrophyte stand downstream.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012299
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  • 4
    Electronic Resource
    Electronic Resource
    Temporal and spatial variability in streams of a pampean basin (1999)
    Springer
    Hydrobiologia 394 (1999), S. 41-52 
    Details
    ISSN: 1573-5117
    Keywords: plain streams ; nutrients ; eutrophication ; organic pollution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Argentine pampean streams exist in a traditionally agricultural region, but they also receive a supply of contaminants in the more urban zones. The objectives of this study are: 1. To analyze the physical, chemical and microbiological characteristics of the streams in the Luján river basin; and 2. To describe the annual variation of some chemical characteristics (primarily nutrients) in one of the streams. Two samplings (winter and summer) were made in 20 streams to determine some physical, chemical and microbiological variables. Topographical variables were also estimated in each stream. Additionally, in one of the streams (Las Flores), monthly measurements of current velocity, flow, and dissolved nitrogen, phosphorus and oxygen were taken during 4 years. The streams are characterized by high nutrient contents. There is no strong heterogeneity in stream chemical characteristics within the same period, however seasonal variations are important . The principal components analysis suggests the existence of two axes of variation within the basin. One reflects a pollution gradient that increases downstream; the other axis shows that waters change from high to low alkalinity and from less to more eutrophic. In Las Flores stream, nutrient concentration varied greatly between years. The concentration of soluble reactive phosphorus was significantly correlated with stream flow (P 〈 0.05). Though there was no correlation between nitrate levels and flow, some estimates indicated that these ions are in high concentrations in the groundwater. The physiognomical characteristics of pampean streams differ greatly from those described in temperate streams of the northern hemisphere, and it may be assumed that they also exhibit distinct functional characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003583418401
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  • 5
    Electronic Resource
    Electronic Resource
    Socio-economic levels and environmental perception in a small town in Argentina (1991)
    Springer
    The environmentalist 11 (1991), S. 163-170 
    Details
    ISSN: 1573-2991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Summary In order to determine the environmental problems as perceived by the community of Luján (Province of Buenos Aires, Argentina), a survey was carried out. The relationship between environmental perception and socio-economic level was also studied. The most important problems reported by the community were the floods, which occur when the Luján river overflows its banks, and the contamination of this river as it flows through Luján city. Deficiencies in the tourist infrastructure were also considered to be serious. The least perceived problem was that of industrial air pollution. Positive correlations between environmental perception, socio-economic standing and levels of instruction were observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01263229
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    Paper (German National Licenses)
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  • 6
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    Antarctic ascidians respiration rate under increasing sedimentation (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-07
    Description: The file includes the respiration rate (milligrams of Oxygen per gram of dry mass (without tunic) per day) of three antarctic solitary ascidians (Cnemidocarpa verrucosa, Molgula pedunculata and Ascidia challengeri) under increasing sediment concentrations (from natural seston (NS) to NS + Additional Suspended particulate matter (SPM) from 5 to 400 mg/L). Individuals were sampled carefully by SCUBA diving during austral summer 2006-2007 in Potter Cove (58°43'5.214"W; 62°14'24.184"S) at 20 m depth. Experiments where performed after acclimation to aquarium conditions in the Dallmann laboratory on Carlini station (58°43'5.214"W; 62°14'24.184"S).
    Keywords: Antarctica; ascidians; DIVER; Experimental treatment; invertebrates; Metabolic rate of oxygen per dry mass; metabolism; PotterCove_SCUBA_06-07; Potter Cove, King George Island, Antarctic Peninsula; Respiration rate; Sampling by diver; sedimentation; Species; Specimen identification
    Type: Dataset
    Format: text/tab-separated-values, 770 data points
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  • 7
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    Physical oceanography at CTD station PotterCove_A3 in 2013 (2016)
    PANGAEA
    Details
    Publication Date: 2024-02-16
    Keywords: Carlini/Jubany Station; Conductivity; CTD_153 CTD_157; CTD/Rosette; CTD-RO; DATE/TIME; Density, sigma-theta (0); DEPTH, water; IMCOAST/IMCONet; Impact of climate induced glacier melt on marine coastal systems, Antarctica; Jubany_Dallmann; PAR lightmeter voltage from downward irradiance; PotterCove_A3; Potter Cove, King George Island, Antarctic Peninsula; Pressure, water; Salinity; Temperature, water; Turbidity (Nephelometric turbidity unit)
    Type: Dataset
    Format: text/tab-separated-values, 15813 data points
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  • 8
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    Physical oceanography at CTD station PotterCove_A4 in 2012 (2016)
    PANGAEA
    Details
    Publication Date: 2024-02-16
    Keywords: Carlini/Jubany Station; Conductivity; CTD_154; CTD/Rosette; CTD-RO; DATE/TIME; Density, sigma-theta (0); DEPTH, water; IMCOAST/IMCONet; Impact of climate induced glacier melt on marine coastal systems, Antarctica; Jubany_Dallmann; PAR lightmeter voltage from downward irradiance; PotterCove_A4; Potter Cove, King George Island, Antarctic Peninsula; Pressure, water; Salinity; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 7134 data points
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  • 9
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    Physical oceanography at CTD station PotterCove_A6 in 2012 (2016)
    PANGAEA
    Details
    Publication Date: 2024-02-16
    Keywords: Carlini/Jubany Station; Conductivity; CTD_156; CTD/Rosette; CTD-RO; DATE/TIME; Density, sigma-theta (0); DEPTH, water; IMCOAST/IMCONet; Impact of climate induced glacier melt on marine coastal systems, Antarctica; Jubany_Dallmann; PAR lightmeter voltage from downward irradiance; PotterCove_A6; Potter Cove, King George Island, Antarctic Peninsula; Pressure, water; Salinity; Temperature, water; Turbidity (Nephelometric turbidity unit)
    Type: Dataset
    Format: text/tab-separated-values, 8726 data points
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  • 10
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    Physical oceanography in Potter Cove during 2011 to 2013 (2016)
    PANGAEA
    In:  Supplement to: Deregibus, Dolores; Quartino, Maria Liliana; Campana, Gabriela L; Momo, Fernando; Wiencke, Christian; Zacher, Katharina (2016): Photosynthetic light requirements and vertical distribution of macroalgae in newly ice-free areas in Potter Cove, South Shetland Islands, Antarctica. Polar Biology, 39(1), 153-166, https://doi.org/10.1007/s00300-015-1679-y
    Details
    Publication Date: 2024-02-16
    Description: In Potter Cove, Antarctica, newly ice-free areas appeared due to glacial retreat. Simultaneously, the inflow of sediment increased, reducing underwater photosynthetically active radiation (PAR, 400-700 nm). The aim of this study was to determine the photosynthetic characteristics of two macroalgal species colonizing three newly ice-free areas, A1, A2 and A3, with increasing degree of glacial influence from A1 to A3. Turbidity, salinity and temperature were measured, and light attenuation coefficients (Kd) calculated and considered as a proxy for glacial sediment input. The lower depth distribution of the red alga Palmaria decipiens and the brown alga Himantothallus grandifolius was 10 m in A3, 20 m in A2 and 30 m in A1. Both species were then collected, at 5 and 10 m at all areas. Photosynthetic parameters and the daily metabolic carbon balance (CB) were determined. Kd was significantly higher in A3 compared with A1 and A2. The CB of P. decipiens was significantly higher in A1 followed by A2 and A3, and significantly higher at shallower than at greater depth. For H. grandifolius CB was significantly lower in A3 and in A2 at deeper depths compared with the rest of areas and depths. The lower distribution limit of the algae was positively correlated to the light penetration. An increase in the sediment run-off due to global warming might lead to an elevation of the lower depth distribution limit but retreating glaciers can open new space for macroalgal colonization. These changes will probably affect macroalgal primary productivity in Potter Cove with consequences for the coastal ecosystem.
    Keywords: IMCOAST/IMCONet; Impact of climate induced glacier melt on marine coastal systems, Antarctica
    Type: Dataset
    Format: application/zip, 15 datasets
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