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  • 1
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    Ultraviolet light: is it harming New Zealand's lakes (2001)
    In:  EPIC3Antarctic Science, 9(1), pp. 10 - 12, ISSN: 1172-1014
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 2
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    Ultraviolet light: is it harming New Zealand's lakes? (2001)
    In:  EPIC3NIWA Water & Atmosphere, 9(1), pp. 10-12, ISSN: 1172-1014
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    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 3
    Electronic Resource
    Electronic Resource
    The role of the littoral zone in the functioning of a shallow tropical lake ecosystem (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 5 (1975), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Lake Chilwa (Malawi) is a shallow tropical lake surrounded by an extensive zone of littoral swamp mainly composed of Typha domingensis. The data produced show that the physical and chemical conditions are different and more varied in the littoral region when compared with the open lake. Primary production in the littoral is confined almost entirely to Typha domingensis, which also acts as a nutrient pump by absorbing nutrients from the soils and eventually releasing them into the lake waters. Long term and short term exchanges in organic and inorganic materials between the littoral swamps and the open lake are described. These, as well as available evidence on the distribution, reproductive habits and diet of certain faunal groups, indicate that the littoral region of Lake Chilwa has an important regulating influence on the functioning of the whole lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1975.tb00147.x
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  • 4
    Electronic Resource
    Electronic Resource
    The role of photosynthesis/light relationships in determining lower depth limits of Characeae in South Island, New Zealand lakes (1996)
    Oxford BSL : Blackwell Science Ltd
    Freshwater biology 35 (1996), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. The maximum depth of colonization of aquatic macrophytes (Zc) was investigated in eighteen South Island, New Zealand lakes. The downward attenuation coefficient for photosynthetically active radiation (Kd(PAR)) was calculated and the spectral characteristics of the lakes determined with a spectroradiometer.2. Characean algae dominated the deepest communities in sixteen of the study lakes.3. Zc was significantly related to Kd(PAR) by the relationship Zc = 4.5/Kd– 2.2.4. From measurements of the photosynthetic properties of Chara corallina (Kl. ex Willd., em R.D.W.) and incident radiation over the course of a year we calculated the depth at which daily net photosynthesis would be equal to zero for each day of the year. An annual average of this depth was significantly related to Zc with anr2 of 0.86.5. Correcting Kd(PAR) for spectral quality and taking into account the potential absorption spectrum of a characean meadow did not improve the relationships.6. We suggest that relationships established between Kd(PAR) and Zc of characean algae in South Island, New Zealand lakes can be explained to a great extent by light limitation of photosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.1996.00481.x
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  • 5
    Electronic Resource
    Electronic Resource
    The photosynthetic and growth rate responses of two freshwater angiosperms in lakes of different trophic status: responses to light and dissolved inorganic carbon (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 25 (1991), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY 1. Two rooted freshwater macrophytes (Lagarosiphon major (Ridley) Moss; Myriophyllum triphyllum Orchard) were grown in two lakes of differing trophic status on sediments collected from an eutrophic lake. In the two experiments (summer and winter) in the oligotrophic lake (Lake Taupo, New Zealand), the relative growth rates of both species were approximately double those recorded in the experiments in the eutrophic take (Lake Rotorua, New Zealand). These growth responses occurred even though the light and temperature regimes were similar at the experimental sites in both lakes and the concentrations of inorganic nutrients were higher in the eutrophic lake water.2. Dissolved inorganic carbon (DIC) analysis of both lake waters indicated that the oligotrophic water had approximately 10-fold more DIC than the eutrophic water. This corresponded, at natural pH, to a 2-fold higher concentration of free-CO2 in the oligotrophic lake water (49 μM) than in the eutrophic lake water (23 μM). Photosynthetic experiments demonstrated that the maximum rates of photosynthesis were 2.46 and 2.25-fold higher in L. major and M. triphyllum, respectively, when the shoots were incubated in Lake Taupo water at Lake Taupo levels of free-CO2 relative to Lake Rotorua water at Lake Rotorua levels of free-CO2.3. It is concluded that these differences in photosynthetic rates would lead approximately to a 2-fold difference in growth rate, thus explaining the growth responses observed in the field experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1991.tb01384.x
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  • 6
    Electronic Resource
    Electronic Resource
    Aquatic weed-bed structure and photosynthesis in two New Zealand lakes
    Amsterdam : Elsevier
    Aquatic Botany 46 (1993), S. 263-281 
    Details
    ISSN: 0304-3770
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0304-3770(93)90007-J
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  • 7
    Electronic Resource
    Electronic Resource
    The rates of dry matter and nutrient loss from decomposing Potamogeton pectinatus in a brackish south-temperate coastal lake (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. Decomposition of Potamogeton pectinatus in Swartvlei, a southern African coastal lake, followed an exponential pattern of decay. The rale constant was 0.0205 day−1 and decay was virtually complete after 158 days. The original stock of ash, phosphorus and potassium was lost more rapidly than dry matter in the initial stages of decomposition due to leaching. Almost the entire stock of potassium and 60% of the phosphorus was lost in the first 7 days. The proportions of N and P in the decomposing detritus increase significantly in the final stages of decomposition, providing a rich food source for the abundant filter-feeding animals of the littoral zone. The decomposition rate of P. pectinatus is compared with that of other aquatic macrophytes and the significance of the relatively rapid decay rate of this species in the ecology of Swartvlei lake is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1979.tb01482.x
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  • 8
    Electronic Resource
    Electronic Resource
    Factors influencing Copper Tolerance in Becium homblei (1972)
    [s.l.] : Nature Publishing Group
    Nature 237 (1972), S. 171-171 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fire, however, cannot be considered the only extrinsic factor influencing the copper tolerance of this species. Previous work on the ecology of Becium homblei2,3 has shown that this species is found in a range of soil types, from granite sandveld where metals are in trace quantities, to soils with ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/237171a0
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  • 9
    Electronic Resource
    Electronic Resource
    Phosphorus cycling in a dense Potamogeton pectinatus L. Bed (1981)
    Springer
    Oecologia 49 (1981), S. 56-66 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An analysis of phosphorus concentrations and standing stocks in the various components of a dense Potamogeton pectinatus L. community in a brackish lake showed that the amounts of P per unit area varied in the following order: Sediments 〉 Above ground macrophytes 〉 Detritus 〉 Benthic Invertebrates 〉 Below ground macrophyte tissue 〉 Epiphytic algae 〉 Water soluble P 〉 Water borne particulate P. Seasonal changes in the variability of these stocks are described, and shown to be controlled by the annual growth and decomposition pattern of the Potamogeton. The sediments were suggested as the major source of P for the plant biomass. Studies using 32P tracer showed that of a given input of P to the water, 32% went to large epiphytic algae, 17% to the Potamogeton, 16% to the benthic fauna (mostly filter feeding bivalves), 28% to the sediments (almost all incorporated in the top 1 cm), and the remaining 7% was adsorbed on to, or absorbed by microorganisms associated with detritus. Analysis of 32P uptake curves indicated that of the P absorbed by the Potamogeton, a significant proportion went to the complex adnate periphyton on the leaf surface. We were unable to separate this fraction. Movement of P in the community was shown to be a closed cycle, and any release of P from decaying macrophytes would be rapidly reabsorbed by epiphytic algae. It is unlikely that phosphorus, once cycling in the macrophyte community, would become transferred to the circulation in the open lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00376898
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  • 10
    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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