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  • 1
    Electronic Resource
    Electronic Resource
    A cause for concern (1991)
    [s.l.] : Nature Publishing Group
    Nature 350 (1991), S. 285-285 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN Acid Rain and Acid Waters Gwyneth Howells refers to acid rain as a cause celebre and one that since 1972 after two decades of intense research has "generated much heat, but not a great deal of light". Most scientists involved in the acid-rain debate would disagree but I know what she means. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/350285a0
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  • 2
    Electronic Resource
    Electronic Resource
    Reconstruction of past changes in salinity and climate using a diatom-based transfer function (1991)
    [s.l.] : Nature Publishing Group
    Nature 352 (1991), S. 706-708 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Our transfer function for salinity reconstruction is based on the statistical relationship between regional modern diatom assemblages in surface sediments and lakewater chemistry. We collected surface-sediment samples for diatom analysis and associated data on water chemistry in 1982 and 1985 from ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/352706a0
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  • 3
    Electronic Resource
    Electronic Resource
    Climate change in Lake Baikal: diatom evidence in an area of continuous sedimentation (2000)
    Springer
    International journal of earth sciences 89 (2000), S. 251-259 
    Details
    ISSN: 1437-3262
    Keywords: Key words Climate change ; Diatoms ; Turbidites ; Palaeolimnology ; Lake Baikal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The presence of inhomogeneous sedimentation is acknowledged as being an important problem in palaeolimnological studies. Sediment records can be disturbed by erosional and redepositional events, which redeposit microfossils within a basin and may then lead to misinterpretations of fossil diatom assemblages. This study uses a combination of sedimentological tools, magnetic susceptibility measurements and high-resolution diatom analysis to show that a sediment core, BAIK80, taken in 345 m water depth from a shoulder region in the North Basin of Lake Baikal, is free of disturbances. Our results confirm that the sediment record is consistent and continuous for the uppermost sediment. Consequently, the fossil diatom data can be used to establish a continuous record of past climate variability over approximately the past 1300 years. Distinct changes occur in downcore abundances of endemic taxa Aulacoseira baicalensis and Cyclotella minuta, and principal components analysis (PCA) indicates a gradual transformation of taxa over the past 1300 years. These changes are likely to be related to climate, although definite links still have to be established.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005319900063
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  • 4
    Electronic Resource
    Electronic Resource
    Diatom and chemical evidence for reversibility of acidification of Scottish lochs (1988)
    [s.l.] : Nature Publishing Group
    Nature 332 (1988), S. 530-532 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1 Physical and chemical characteristics for Loch Enoch and Round Loch of Glenhead (1978-79 and 1984-86) Round Loch Loch Enoch of Glenhead Altitude (m) 493 299 Lake area (ha) 50 12.6 Catchment area (ha) 186 95 Catchment: lake 3.7 7.5 Max. depth ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/332530a0
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  • 5
    Electronic Resource
    Electronic Resource
    Alternative 210 Pb dating: results from the New Guinea Highlands and Lough Erne (1978)
    [s.l.] : Nature Publishing Group
    Nature 271 (1978), S. 339-342 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Unsupported 210Pb concentration against depth in cores from Lough Erne, Northern Ireland, and Lake Ipea, Papua New Guinea. a, Lower Lough Erne, profile SMI; b, Lower Lough Erne profile FM1; c, Upper Lough Erne profile FM2; d, Lake Ipea, Core 1. Fig. 2 Alternative 210Pb based age against ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/271339a0
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  • 6
    Electronic Resource
    Electronic Resource
    The CASPIA project: diatoms, salt lakes, and environmental change (1994)
    Springer
    Journal of paleolimnology 12 (1994), S. 191-196 
    Details
    ISSN: 1573-0417
    Keywords: diatoms ; saline lakes ; palaeolimnology ; palaeoclimate ; transfer functions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract The Climate and Salinity (CASPIA) Project is concerned with diatoms as environmental indicators in inland waters and their use in reconstructing salinity and major ion composition from fossil diatom assemblages in lake sediments. By comparing saline lake diatom floras from around the world the project aims to establish a common, harmonised approach to sample collection, diatom identification and nomenclature, and to develop techniques for numerical analysis and data storage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00678020
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  • 7
    Electronic Resource
    Electronic Resource
    The Kråkenes late-glacial palaeoenvironmental project (1996)
    Springer
    Journal of paleolimnology 15 (1996), S. 281-286 
    Details
    ISSN: 1573-0417
    Keywords: climatic change ; environmental reconstruction ; Kråkenes ; late-glacial ; multi-disciplinary project
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Kråkenes is the site of a small lake on the west coast of Norway that contains a long sequence of late-glacial sediments. The Younger Dryas is well represented, as a cirque glacier developed in the catchment at this time. This site offers unique opportunities to reconstruct late-glacial environments from independent sources of evidence; physical evidence (glacial geomorphology, sedimentology, palaeomagnetism, radiocarbon dating), and biological evidence from the remains of animals and plants derived from both the terrestrial and aquatic ecosystems. This report describes the background to the site, and the international multidisciplinary project to reconstruct late-glacial and early Holocene environmental and climatic changes at Kråkenes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00213048
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  • 8
    Electronic Resource
    Electronic Resource
    Matching diatom assemblages in lake sediment cores and modern surface sediment samples: the implications for lake conservation and restoration with special reference to acidified systems (1997)
    Springer
    Hydrobiologia 344 (1997), S. 27-40 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Restoration goals for damaged freshwater habitats can bedefinedaccording to ecological as well as to chemical criteria. Fordisturbed lakes, the sediment microfossil record can be usedtoselect potential modern analogue sites as possible restorationtarget ecosystems.Fossil diatom assemblages in two acidified lakes (Round LochofGlenhead and Loch Dee) in Galloway, Scotland, were comparedfloristically with modern surface sediment samples from ca. 200lakes in Britain, Ireland, Sweden and Norway using numericaltechniques. Mean squared Chi-squared dissimilarity (SCD)valuesbased on between sample Chi-square distance measures were usedtocompare samples.‘Space-for-time substitution’ using diatom assemblage matchingtechniques identified several modern analogue sites withHebrideanLoch Teanga and Irish Lough Claggan possessing modern diatomflorasmost similar to those which existed at the Round Loch ofGlenheadand Loch Dee before acidification.From the point of view of atmospheric pollution, the mostcloselymatching modern analogue sites were not necessarily in themostpristine regions. Some analogues occurred in UK regions ofmoderateor low acid deposition and modern diatom assemblages inatmospherically cleaner mid Norway were generally less similarfloristically.It is argued that identification of modern analogue sitesraisesthe possibility of using time-space substitution of closelymatchedmodern and fossil samples to infer whole lake ecosystems.Diatoms are however poor indicators of some water chemistryvariables and the two closest matched modern analogue siteshavetoo high calcium concentrations making faunistic comparisonsquestionable.Identification of good modern analogue lakes can be improvedbyusing selection criteria, other than diatoms, to pre-selectsites.Screening inappropriate sites according to water chemistry andbasin features combined with a larger biological database ofmodernand fossil samples offers a promising way of refining theselectionprocesses.Despite necessary refinements, modern analogue matching canpotentially identify whole lake ecosystems that can serve asbiological target communities for currently disturbed sites.Beingbased on biological rather than chemical criteria, thisapproachdoes not rely on species-water chemistry transfer functions.It istherefore directly relevant to lake conservation andrestorationobjectives and offers an alternative method for reconstructing lakepalaeo-environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002941908602
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  • 9
    Electronic Resource
    Electronic Resource
    The relationship between diatoms and surface water quality in the Høylandet area of Nord-Trøndelag, Norway (1997)
    Springer
    Hydrobiologia 348 (1997), S. 69-80 
    Details
    ISSN: 1573-5117
    Keywords: diatoms ; water quality ; acidification ; pH calibration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Although the ecological effects of surface wateracidification are now well researched, factorscontrolling the abundance and occurrence of aquaticorganisms in unpolluted acid-sensitive systems arepoorly known. The Høylandet region in central Norwayexperiences relatively low levels of atmosphericpollution and its surface waters, although acid, arenot significantly acidified. Hence lakes and streamsin this region were selected to study the influence ofwater chemistry on diatom algae. Relationships betweenthe two were explored using the multivariate techniqueof canonical correspondence analysis (CCA). Theprincipal water chemistry variables influencingspecies composition of periphytic diatoms were foundto be pH and water colour. Furthermore, therelationship between species abundance and pH wassufficiently strong to enable reconstruction of wateracidity from diatom data. Establishing the nature ofaquatic communities in atmospherically clean butgeologically sensitive regions is an important meansof identifying control systems against which therecovery of acidified lakes in polluted regions can beassessed. The Høylandet region has the potential toprovide a Europe-wide control system of this naturebut much further work is required to follow up andextend the results of this preliminary study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003085116632
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  • 10
    Electronic Resource
    Electronic Resource
    Diatom-based pH reconstruction studies of acid lakes in Europe and North America: A synthesis (1986)
    Springer
    Water, air & soil pollution 30 (1986), S. 347-354 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The analysis of diatom assemblages in lake sediments is being increasingly used to reconstruct past trends in the pH of acid lakes. This paper briefly reviews the data that are now available for Europe and North America and concludes that the evidence is consistent with the acid deposition hypothesis for recent lake acidification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00305205
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