ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Monograph available for loan
    Monograph available for loan
    Ecosystem dynamics in a polar desert : the McMurdo Dry Vallays, Antarctica (1998)
    Washington : American Geophysical Union
    Associated volumes
    Details Availability
    Call number: AWI G1-98-0025
    In: Antarctic research series
    Type of Medium: Monograph available for loan
    Pages: XI, 369 S. : graph. Darst. + 1 CD-ROM
    ISBN: 0875908845
    Series Statement: Antarctic research series 72
    Language: English
    Note: CONTENTS: The Antarctic Research Series / Board of Associate Editors. - Preface / John C. Priscu. - Section 1: Physical and Hydrological Environment. - The Composite Glacial Erosional Landscape of the Northern McMurdo Dry Valleys: Implications for Antarctic Tertiary Glacial History / Michael L. Prentice, Johan Kleman, and Arjen P. Stroeven. - Solar Radiation in the McMurdo Dry Valleys, Antarctica / Gayle L. Dana, Robert A. Wharton Jr., and Ralph Dubayah. - Glaciers of the McMurdo Dry Valleys, Southern Victoria Land, Antarctica / Andrew G. Fountain, Gayle L. Dana, Karen J. Lewis, Bruce H. Vaughn, and Diane M. McKnight. - Geochemical Linkages Among Glaciers, Streams, and Lakes Within the Taylor Valley, Antarctica / W. Berry Lyons, Kathy A. Welch, Klaus Neumann, Jeffrey K. Toxey, Robyn McArthur, Changela Williams, Diane M. McKnight, and Daryl Moorhead. - Section 2: Stream Environment. - Hydrologic Processes Influencing Streamflow Variation in Fryxell Basin, Antarctica / Peter A. Conovitz, Diane M. McKnight, Lee H. MacDonald, Andrew G. Fountain, and Harold R. House. - Longitudinal Patterns in Algal Abundance and Species Distribution in Meltwater Streams in Taylor Valley, Southern Victoria Land, Antarctica / Diane M. McKnight, Alex Alger, Cathy M. Tate, Gordon Shupe, and Sarah Spaulding. - Primary Production Processes in Streams of the McMurdo Dry Valleys, Antarctica / Ian Howes and Clive Howard-Williams. - Modeling Nitrogen Transformations in Dry Valley Streams, Antarctica / Daryl L. Moorhead, Diane M. McKnight, and Cathy M. Tate. - Section 3: Lake Environment. - Physical Limnology of the McMurdo Dry Valley Lakes / Robert H. Spigel and John C. Priscu. - Optical Properties of the McMurdo Dry Valley Lakes, Antarctica / Clive Howard-Williams, Anne-Maree Schwarz, Ian Hawes, and John C. Priscu. - Cobalt Cycling and Fate in Lake Vanda / William J. Green, Donald E. Canfield, and Philip Nixon. - The Abundance of Ammonium-Oxidizing Bacteria in Lake Bonney, Antarctica, Determined by Immunofluorescence, PCR, and in Situ Hybridization / Mary A. Voytek, Bess B. Ward, and John C. Priscu. - Pigment Analysis of the Distribution, Succession, and Fate of Phytoplankton in the McMurdo Dry Valley Lakes of Antarctica / Michael P. Lizotte and John C. Priscu. - Fluorescence Quenching in Phytoplankton of the McMurdo Dry Valley Lakes (Antarctica): Implications for the Structure and Function of the Photosynthetic Apparatus / Patrick J. Neale and John C. Priscu. - Protozooplankton and Microzooplankton Ecology in Lakes of the Dry Valleys, Southern Victoria Land / Mark R. James, Julie A. Hall, and Johanna Laybourn-Parry. - Permanent Ice Covers of the McMurdo Dry Valleys Lakes, Antarctica: Liquid Water Contents / Christian H. Fritsen, Edward E. Adams, Christopher P. McKay, and John C. Priscu. - Permanent Ice Covers of the McMurdo Dry Valley Lakes, Antarctica: Bubble Formation and Metamorphism / Edward E. Adams, John C. Priscu, Christian H. Fritsen, Scott R. Smith, and Steven L. Brackman. - Section 4: Soil Environment. - The Soil Environment of the McMurdo Dry Valleys, Antarctica / Iain B.Campbell, Graeme G. C. Claridge, David I. Campbell, and Megan R. Balks. - Soil Biodiversity and Community Structure in the McMurdo Dry Valleys, Antarctica / Diana Wall Freckman and Ross A. Virginia. - Section 5: Summary. - Science and Environmental Management in the McMurdo Dry Valleys, Southern Victoria Land, Antarctica / Colin M. Harris. - The McMurdo Dry Valley Ecosystem: Organization, Controls, and Linkages / Daryl L. Moorhead and John C. Priscu. - Section 6: CDROM. - Digital Geospatial Datasets Pertaining to the McMurdo Dry Valleys of Antarctica: The SOLA/AGU CDROM / Jordan Towner Hasting.
    Location: AWI Reading room
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    BOOK
    Link to Library Catalog
    get availability status
  • 2
    Electronic Resource
    Electronic Resource
    Time-course of inorganic nitrogen uptake and incorporation by natural populations of freshwater phytoplankton (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 17 (1987), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. 1. Time-course measurements of NH4+ and NO3−uptake were made on the natural phytoplankton populations in a eutrophic lake at a time when these nutrients were at their lowest annual concentration.2. Both NH4+ and NO3− uptake was increased at least five-fold during the first 5 min of incubation following near saturating pulses of these nutrients.3. Elevated uptake was also observed following low level (∼2μg N 1−1) pulses of NH4+ and NO3−, but substrate depletion during the first hour of incubation may have been partially responsible for this apparent enhancement.4. Incorporation of I5N into TCA-insoluble material (protein) following the saturating NH4+ pulse was increased less than total cellular 15N uptake, whereas no elevation of 15N incorporation into protein was observed following a saturating NO3−pulse.5. The percentage of I5N incorporated into protein, with respect to total cellular uptake, was ∼32% and ∼12% for NH4+ and NO3−, respectively, following 5 h of incubation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1987.tb01053.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Microplankton dynamics in a perennially ice-covered Antarctic lake – Lake Hoare (2004)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 49 (2004), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. Temporal and spatial variation in planktonic abundance, biomass and composition were determined in Lake Hoare (McMurdo Dry Valleys, Antarctica) over two summer seasons (1996–97 and 1997–98).2. Phototrophic nanoflagellates (PNAN) dominated planktonic biomass, with a mean monthly biomass ranging between 27.3 and 40.4 μg C L−1. The deep chlorophyll maximum was mainly composed of cryptophytes (〉87% of total PNAN biomass) and varied in depth between 6 and 12 m.3. Maximum bacterial concentration was 11.8 × 105 cells mL−1. Bacterial abundance showed relatively little temporal variation, with the exception of a drop in numbers that occurred in late November of both years studied.4. Ciliates were the most successful heterotrophic protozoan group, with a mean monthly biomass (1.2–3.2 μg C L−1) being typically at least double that of heterotrophic nanoflagellate (HNAN) biomass (0.1–0.7 μg C L−1).5. Microbial processes within this lake appear to be dominated by bottom up control. The relative importance of allochthonous inputs into the lake (from the ice-cover and stream flow) and autochthonous recycling (by microzooplankton regeneration) are considered.6. Results from a horizontal transect indicate that the permanence of the main sample hole may have enhanced planktonic biomass over a relatively small spatial scale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.2004.01230.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    An inexpensive device for sampling large volumes of lake water from discrete depths (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 20 (1988), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY 1. A sampler was developed that displaces surface water which is replaced with water from a sampling tube at a set depth.2. The displacement sampler is inexpensive, easy to build, and is capable of collecting water at 7.5 I min−1.3. Phytoplankton photosynthesis was higher in water from the displacement sampler than in water collected with a Van-Dorn bottle. Subsequent experiments indicated this was due to inhibition caused by the Van-Dorn bottle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1988.tb01722.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    The effect of temperature on photosynthetic and respiratory electron transport system activity in the shallow and deep-living phytoplankton of a subalpine lake (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 14 (1984), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. 1. The influence of temperature on in vivo photosynthetic and in vitro respiratory electron transport system (ETS) activity was determined over the season for the 3 m (warm-water) and a 20m (cold-water) phytoplankton communities in Castle Lake. The optimum temperature of photosynthesis at 3 m (X̄=20.8°C) was significantly higher than the average optimum at 20 m (X̄=14.8°C).2. Seasonally, the photosynthetic temperature optimum increased when the blue-green alga Chroococcus limneticus Lemm. was present. The temperature characteristics of this organism were maintained even after it had settled into the cold water of the hypolimnion.3. Temperature optima were not significantly different in experiments conducted under limiting or saturating photosynthetic photon flux densities (PPFD).4. Short-term (1 h) preincubations with dissolved inorganic nitrogen (DIN) (≃80 μg NH4NO3-N l−1) had little effect on the temperature characteristics of photosynthesis while the longer (〉24 h) incubations provided by a whole-lake epilimnetic DIN addition (≃75 μg NH4NO3- N l−1) significantly lowered the photosynthetic temperature optimum to 12.5°C. Once this epilimnetic DIN was depleted the optimum roseto25°C, a value higher than that present before the enrichment, which coincided with the growth of C limneticus.5. Respiratory ETS activity usually began to inactivate between 19 and 20°C. However, when C. limneticus was abundant the inactivation temperature was often greater ihan 25°C.6. The average energy of activation (E) and Q10 value for the 3 m community (15.9 kcal mol−1 and 2.6 respectively) were significantly higher than those at 20 m (14.2 kcal mol−1 and 2.4 respectively). Seasonally, the highest E and Q10 values of ETS activity occurred during the late-summer bloom of C. limneticus.7. These results demonstrate that the epilimnetic and hypolimnetic phytoplankton communities in Castle Lake are physiologically distinct with regards to their temperature characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1984.tb00028.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Influence of phytoplankton on the response of bacterioplankton growth to nutrient enrichment (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 31 (1994), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. Laboratory experiments were conducted to test the effect of nutrient enrichment on bacterioplankton growth in the presence and absence of phytoplankton.2. In one series of experiments, bacterioplankton growth in terms of specific activity [3H-thymidine incorporation (cell number)−1] was greater in whole lake water samples than in samples from which phytoplankton had been removed by filtration (1.0 μm), regardless of the nutrient enrichments (control, NH+4 plus PO3-4 and mannitol). Organic C enhanced bacterioplankton growth in both whole and filtered lake water.3. In another series of experiments (with the same nutrient enrichments as in the first experiment except that glucose replaced mannitol), bacterioplankton growth in whole lake water enriched with PO3-4 plus NH+4 and incubated in the light was greater than in two treatments designed to inhibit photosynthetic activity (+DCMU and dark). Bacterioplankton response to nutrient addition was greatest in the PO3-4 plus NH+4 enrichment under all three conditions (light +DCMU, and dark).4. These results indicate that bacterioplankton growth could be directly limited by inorganic P and N when these elements are in short supply. Enhancement of bacterioplankton growth by phytoplankton occurs only under PO3-4 and NH+4 replete environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1994.tb00852.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Isolation and verification of anatoxin-a producing clones of Anabaena flos-aquae (Lyngb.) de Breb. from a eutrophic lake (1993)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 12 (1993), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract We present a technique to isolate and confirm anatoxin-a producing clones (single trichome-isolates) of Anabaena flos-aquae (Lyngb.) de Breb. from blooms of this cyanobacterium. A single trichome is isolated from a field sample and grown in ASM medium. Single trichomes are then isolated from this culture and grown in ASM medium to produce single clone cultures. Mouse bioassay, and thin-layer chromatography (TLC) using purified anatoxin-a as reference is then used to confirm the anatoxin-a producing clones. Using this methodology, Anabaena flos-aquae samples collected during July 1991 from Hebgen Lake, Montana, were found to contain only 8.7% anatoxin-a producing clones. This minor proportion of anatoxin-a producing clones apparently accounts for the anatoxin-a produced by the entire population of A. flos-aquae. Our technique is simple and reproducible. A selected clone of A. flos-aquae that produces anatoxin-a and one that does not produce anatoxin-a were deposited in the UTEX culture collection, University of Texas at Austin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.1993.tb00024.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Phytoplankton nutrient deficiency in lakes of the McMurdo dry valleys, Antarctica (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 34 (1995), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. The influence of inorganic nitrogen and phosphorus enrichment on phytoplankton photosynthesis was investigated in Lakes Bonney (east and west lobes), Hoare, Fryxell and Vanda, which lie in the ablation valleys adjacent to McMurdo Sound, Antarctica. Bioassay experiments were conducted during the austral summer on phytoplankton populations just beneath the permanent ice cover in all lakes and on populations forming deep-chlorophyll maxima in the east and west lobes of Lake Bonney.2. Phytoplankton photosynthesis in surface and mid-depth (13 m) samples from both lobes of Lake Bonney were stimulated significantly (P 〈 0.01) by phosphorus enrichment (2 μM) with further stimulation by simultaneous phosphorus plus NH4+ (20 μM) enrichment. Similar trends were observed in deeper waters (18 m) from the east lobe of Lake Bonney, although they were not statistically significant at P 〈 0.05. Photosynthesis in this lake was never enhanced by the addition of 20 μM NH4+ alone. Simultaneous addition of phosphorus plus nitrogen stimulated photosynthesis significantly (P 〈 0.01) in both Lake Hoare and Lake Fryxell. No nutrient response occurred in Lake Vanda, where activity in nutrient-enriched samples was below unamended controls; results from Lake Vanda are suspect owing to excessively long sample storage in the field resulting from logistic constraints.3. Ambient dissolved inorganic nitrogen (DIN) (NH4++ NO2−+ NO3−): soluble reactive phosphorus (SRP) ratios partially support results from bioassay experiments indicating strong phosphorus deficiency in Lake Bonney and nitrogen deficiency in Lakes Hoare and Fryxell. DIN : SRP ratios also imply phosphorus deficiency in Lake Vanda, although not as strong as in Lake Bonney. Particulate carbon (PC): particulate nitrogen (PN) ratios all exceed published ratios for balanced phytoplankton growth, indicative of nitrogen deficiency.4. Vertical nutrient profiles in concert with low advective flux, indicate that new (sensu Dugdale & Goering, 1967) phytoplankton production in these lakes is supported by upward diffusion of nutrients from deep nutrient pools. This contention was tested by computing upward DIN : SRP flux ratios across horizontal planes located immediately beneath each chlorophyll maximum and about 2 m beneath the ice (to examine flux to the phytoplankton immediately below the ice cover). These flux ratios further corroborated nutrient bioassay results and bulk DIN : SRP ratios indicating phosphorus deficiency in Lakes Bonney and Vanda and potential nitrogen deficiency in Lakes Hoare and Fryxell.5. Neither biochemical reactions nor physical processes appear to be responsible for differences in nutrient deficiency among the study lakes. The differences may instead be related to conditions which existed before or during the evolution of the lakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1995.tb00882.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Distribution of organic carbon and nitrogen in surface soils in the McMurdo Dry Valleys, Antarctica (2000)
    Springer
    Polar biology 23 (2000), S. 121-128 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The organic carbon and nitrogen contents of sediments in the upper 2 cm of the soils surrounding several lakes in the McMurdo Dry Valleys were measured in a relatively high-density sampling grid, in order to better understand the present-day distribution of organic matter in the ecosystem that is most readily transportable via aeolean processes. Carbon and nitrogen contents of the bulk sediments and size-differentiated sediments decreased in a series according to lake basins oriented along the Taylor Valley's main axis (Lake Fryxell 〉 Hoare ≥ west lobe Bonney ≥ east lobe Bonney). Samples were also obtained around Lake Vida and showed this basin to contain less organic matter than those in the Taylor Valley. This regional spatial analysis supports the emerging view that each basin provides distinct environments for in situ microbial activity, lithogenic weathering, aeolian deposition and sorting that can be detected through synoptic sampling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050017
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Temperature dependence of inorganic nitrogen uptake and assimilation in Antarctic sea-ice microalgae (1989)
    Springer
    Polar biology 9 (1989), S. 443-446 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The influence of temperature on NO 3 - and NH 4 + uptake, and the activity of the assimilatory enzyme NO 3 - reductase (NR) was compared to inorganic C uptake (photosynthesis) in natural assemblages of Antarctic sea-ice microalgae. NO 3 - and NH 4 + uptake reached a maximum between 0.5°–2.0°C and 2.0°–3.0°C, respectively, which was close to that for photosynthesis (2.5°–3.0°C). NR showed a distinctly higher temperature maximum (10.0°–12.0°C) and a lower Q10 value than inorganic N and C transport. Our data imply that, owing to differential temperature characteristics between N transport and N assimilation at in situ temperature (-1.9°C), the incorporation of extracellular NO 3 - into cellular macromolecules, may be limited by transport of NO 3 - into the cell rather than the intracellular reduction of NO 3 - to NH 4 + . Despite differences in temperature maxima between N transport and N assimilation, the overall low temperature maxima of inorganic N metabolism characterizes Antarctic sea-ice microalgae as psychrophilic. Our study is the first to examine the temperature dependence of inorganic N uptake and assimilation in sea-ice microbial communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00443231
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...