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  • 1
    Monograph available for loan
    Monograph available for loan
    Antarctic limnology : extreme aquatic environments (1987)
    Wellington
    Details Availability
    Call number: AWI G2-95-0246
    Type of Medium: Monograph available for loan
    Pages: 33 S.
    ISBN: 0477067999
    Series Statement: DSIR Bulletin 241
    Branch Library: AWI Library
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  • 2
    Electronic Resource
    Electronic Resource
    Enantiospecific Syntheses of Penta-N,O,O,O,O-acetylvalidamine and Penta-N,O,O,O,O-acetyl-2-epi-validamine (1995)
    s.l. : American Chemical Society
    The @journal of organic chemistry 60 (1995), S. 5332-5334 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00121a065
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  • 3
    Electronic Resource
    Electronic Resource
    Stages of infection and ecological effects of a fungal epidemic on the eggs of a limnetic copepod (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 9 (1979), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. Fungal infection of calanoid copepod (Diaptomus novamexicanus) eggs was observed in each of three years in an alpine lake (Castle Lake, California, U.S.A.). Stages in the infection process were examined by light and scanning electron microscopy and evidence was obtained that the Lagenidium-like fungus concerned was a virulent parasite. Fungal destruction of eggs varied in timing and severity from year to year. The maximum impact of the disease was an estimated 48.4% decrease in potential copepod recruitment in 1976 due to the onset of a severe epidemic early in the summer growing season. The minimum impact, a 5.6% decrease in potential recruitment, was recorded in 1975. In this year the proportion of infected eggs was reduced and large numbers of juveniles had been released before the fungal disease began. The 1974 epidemic was intermediate in severity. The effect of these epidemics on Castle Lake calanoid populations is discussed in relation to temperature, food availability and predation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1979.tb01534.x
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  • 4
    Electronic Resource
    Electronic Resource
    Nitrate cycling in Lake Titicaca (Peru-Bolivia): the effects of high-altitude and tropicality (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 15 (1985), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. 〈list xml:id="l1" style="custom"〉1The vertical distribution of dissolved oxygen and inorganic nitrogen differed considerably between three stratification cycles in Lake Titicaca, a tropical lake (latitude 16°S) in the high Andes (3800 m altitude). In 1980/81 an anoxic layer of water extended from 200 to 275 m and contained high levels of NH4 but zero NO3. During the annual deep mixing period in 1981 this layer was substantially eroded, and was completely eliminated during deep-mixing in 1982.2Nitrapyrin assays of nitrification demonstrated highest activity in the surface mixed layer, lowest activity just beneath the thermocline, and then increasing nitrification rates with increasing depth towards the bottom anoxic zone. Denitrification rates were slow, but detectable, in the surficial sediments of Lake Titicaca during late 1982. Much faster rates were estimated for the periods of water column anoxia.3Lake Titicaca is a productive lake with low saturation levels of oxygen because of its high altitude. These features favour hypolimnetic anoxia, and thus denitrification which varies in magnitude from year to year.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1985.tb00694.x
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  • 5
    Electronic Resource
    Electronic Resource
    Nitrous oxide cycling in Lake Vanda, Antarctica (1981)
    [s.l.] : Nature Publishing Group
    Nature 292 (1981), S. 618-620 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Lake Vanda was sampled at a mid-lake deep-water site (maximum depth 68 m) during the austral summer of 1980-81. Holes were bored through the 3-3.5-m permanent ice-cap and 1-1 samples removed with a discrete-depth water sampler. The unusual temperature and salinity profiles of Lake Vanda have been ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/292618a0
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  • 6
    Electronic Resource
    Electronic Resource
    Ice Shelf Microbial Ecosystems in the High Arctic and Implications for Life on Snowball Earth (2000)
    Springer
    Naturwissenschaften 87 (2000), S. 137-141 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Notes: Abstract  The Ward Hunt Ice Shelf (83°N, 74°W) is the largest remaining section of thick (〉10 m) landfast sea ice along the northern coastline of Ellesmere Island, Canada. Extensive meltwater lakes and streams occur on the surface of the ice and are colonized by photosynthetic microbial mat communities. This High Arctic cryo-ecosystem is similar in several of its physical, biological and geochemical features to the McMurdo Ice Shelf in Antarctica. The ice-mats in both polar regions are dominated by filamentous cyanobacteria but also contain diatoms, chlorophytes, flagellates, ciliates, nematodes, tardigrades and rotifers. The luxuriant Ward Hunt consortia also contain high concentrations (107–108 cm–2) of viruses and heterotrophic bacteria. During periods of extensive ice cover, such as glaciations during the Proterozoic, cryotolerant mats of the type now found in these polar ice shelf ecosystems would have provided refugia for the survival, growth and evolution of a variety of organisms, including multicellular eukaryotes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001140050692
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  • 7
    Electronic Resource
    Electronic Resource
    Vertical and horizontal structure in the picoplankton communities of a coastal upwelling system (1990)
    Springer
    Marine biology 106 (1990), S. 465-471 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution of prokaryotic and eukaryotic picoplankton in the west coast upwelling-region off the South Island of New Zealand was investigated during midwinter (1988) the time of year when several commercially important fish species migrate into the region to breed. Picoplanktonic cells were major contributors to the autotrophic biomass, with 〉 80% of the particulate nitrogen and 39 to 55% of the total chlorophylla contained in the 〈2µm size-fraction. The prokaryotic picoplankton concentrations ranged from 6.3 × 105 to 2.1 × 107 cell l−1, and the eukaryotic picoplankton between 3.9 × 105 to 1.2 × 107 cells l−1. Picoplankton numbers increased with distance offshore to a maximum of ~ 3.0 × 107 cells l−1 at ~ 35 km from the coast, and then diminished towards the outer shelf and open ocean. The ratio of prokaryotic to eukaryotic cells varied between 1.01 and 4.71 in the mixed layer. Both groups declined substantially beneath the pycnocline, with no evidence of deep maxima. Prokaryotic cells dominated the planktonic cell concentrations at all but two stations, but eukaryotic cells dominated picoplankton biovolume as a result of their larger average cell size. The prokaryotic to eukaryotic picoplankton cell-number ratios in this system were considerably lower than often recorded elsewhere, and were inversely correlated with nitrate concentration. These observations show that a eukaryoticdominated picoplankton community makes a substantial contribution to autotrophic biomass in this nutrient-rich upwelling system, and may thereby play a major role in the food-web dynamics of this coastal fishery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01344327
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  • 8
    Electronic Resource
    Electronic Resource
    Response to nutrient enrichment by the plankton of Antarctic coastal lakes and the inshore Ross Sea (1982)
    Springer
    Polar biology 1 (1982), S. 159-165 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Water samples from coastal lakes and ponds on Ross Island (77°S) and from the adjacent Ross Sea were analyzed to determine nutrient supply relative to the population size of planktonic algae and bacteria. An enrichment test was applied to each water to measure N and P accumulation by the seston as a guide to nutrient demand and deficiency. In all waters, including the sea, the dissolved inorganic N-to-P ratios were low, but inorganic nitrogen was generally present at concentrations that satisfied or exceeded the current growth requirements of the algae. None of the samples responded to added P, and only 3 of the 13 plankton assemblages tested responded positively to nitrogen enrichment. These waters are therefore characterized by an abundance of resources relative to demand. This apparently r-selecting coastal environment contrasts markedly in many ecosystem properties with the inland meromictic lakes of Antarctica.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00287002
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  • 9
    Electronic Resource
    Electronic Resource
    Arctic cyanobacteria and limnological properties of their environment: Bylot Island, Northwest Territories, Canada (73°N, 80°W) (1997)
    Springer
    Polar biology 17 (1997), S. 523-534 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cyanobacteria were a major constituent of phototrophic communities in the lakes, ponds and streams of Bylot Island, in the Canadian high Arctic. The waters spanned a range of temperatures (1.8–16.8°C in late July), pH regimes (6.2–9.2) and conductivities (1.5–1700 μS cm−1) but nutrient concentrations were consistently low (〈 1 μg dissolved reactive P l−1 at all sites; 〈 10 μg NO3-N l−1 at most sites). Picoplanktonic species (Synechococcus spp.) were often the numerical dominants in the plankton, and periphytic filamentous species (Oscillatoriaceae) commonly formed thick (5–50 mm) benthic mats. Bloom-forming species of cyanobacteria were either absent or poorly represented even in Chla-rich ponds. The total community biomass ranged from 0.1 to 29.8 μg Chla l−1 in the plankton and from 1.1 to 34.8 μg Chla cm−2 in the benthos. The in vivo absorbance characteristics of isolates from these environments indicated a genetically diverse range of species in each group of Arctic cyanobacteria. Growth versus irradiance relationships were determined for each of the isolates and similarly revealed large genetic differences (maximum growth rates from 0.17 to 0.61 day−1), even between morphologically identical taxa. A comparison of nutrients, pigment concentrations and species composition underscores the strong similarities between freshwater ecosystems in the north and south polar zones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050151
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  • 10
    Electronic Resource
    Electronic Resource
    Biodiversity in extreme aquatic environments: Lakes, ponds and streams of the Ross Sea sector, Antarctica (1996)
    Springer
    Biodiversity and conservation 5 (1996), S. 1451-1471 
    Details
    ISSN: 1572-9710
    Keywords: algae ; Antarctica; cyanobacteria ; freshwater ; limnology ; microbial ; polar ; protozoa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: The Ross Sea Sector (RSS) of Antarcticallies between the lines of longitude 150°E and 150°W and contains diverse landscapes with a variety of lakes, ponds and streams. Neither insects nor crustacean species have been recorded in these ecosystems but most contain planktonic and/or benthic communities that are composed exclusively of microscopic organisms. Microbial brodiversity is low with a small number of species (e.g. filamentous cyanobacteria of the family Oscillatoriaceae) occurring under a broad range of environmental conditions throughout the region. There is no evidence to date of microbial endemism in the RSS; however, there is a need to apply molecular and cellular techniques to compare biodiversity and genetic characteristics with assemblages elsewhere in Antarctica and with comparable communities in the north polar zone. A series of hypotheses are advanced to help guide further work. These derive from the conclusion that environmental extremes plus biogeographical isolation control the biodiversity of RSS communities, and that biological interactions (competition, grazing, predation, parasitism) are weak and play a minor role by comparison with temperate latitude ecosystems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00051987
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