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  • 1
    Digitale Medien
    Digitale Medien
    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
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [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 ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/271339a0
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  • 2
    Digitale Medien
    Digitale Medien
    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
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [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 ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/332530a0
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [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 ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/352706a0
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  • 4
    Digitale Medien
    Digitale Medien
    A cause for concern (1991)
    [s.l.] : Nature Publishing Group
    Nature 350 (1991), S. 285-285 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [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. ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/350285a0
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  • 5
    Digitale Medien
    Digitale Medien
    The CASPIA project: diatoms, salt lakes, and environmental change (1994)
    Springer
    Journal of paleolimnology 12 (1994), S. 191-196 
    Details
    ISSN: 1573-0417
    Schlagwort(e): diatoms ; saline lakes ; palaeolimnology ; palaeoclimate ; transfer functions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00678020
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  • 6
    Digitale Medien
    Digitale Medien
    Paleolimnological evidence for the recent acidification of Llyn Hir, Dyfed, Wales (1989)
    Springer
    Journal of paleolimnology 2 (1989), S. 245-262 
    Details
    ISSN: 1573-0417
    Schlagwort(e): acidification ; diatoms ; sediment chemistry ; magnetic stratigraphy ; soot ; paleolimnology ; Wales
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie
    Notizen: Abstract A variety of paleolimnological techniques, coupled with historical data on land-use and fisheries, are used to evaluate the magnitude, timing, and causes of acidification of Llyn Hir, a moorland lake in central Wales. pH reconstruction based on diatom analysis suggests a gradual decline in lakewater pH beginning ca. 1870 and intensifying in the mid-1930's, with a total decline of 1.1 pH units between 1870 and 1984. This pH decline correlates with increased sedimentary concentrations of carbonaceous particles, trace metals, and magnetic minerals, which indicate the local deposition of atmospherically transported products of fossil-fuel combustion. Pollen data and the historical record show no significant alterations in land-use or catchment vegetation, indicating that acidification of Llyn Hir is a result of the increased deposition of atmospheric pollutants, not of land-use and vegetation change.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00195475
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  • 7
    Digitale Medien
    Digitale Medien
    The Kråkenes late-glacial palaeoenvironmental project (1996)
    Springer
    Journal of paleolimnology 15 (1996), S. 281-286 
    Details
    ISSN: 1573-0417
    Schlagwort(e): climatic change ; environmental reconstruction ; Kråkenes ; late-glacial ; multi-disciplinary project
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00213048
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  • 8
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): diatoms ; water quality ; acidification ; pH calibration
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1003085116632
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  • 9
    Digitale Medien
    Digitale Medien
    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
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1002941908602
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  • 10
    Digitale Medien
    Digitale Medien
    210Pb dating by low background gamma counting (1986)
    Springer
    Hydrobiologia 143 (1986), S. 21-27 
    Details
    ISSN: 1573-5117
    Schlagwort(e): 210Pb and 226Ra measurements ; sediments
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Lead-210 and radium-226 measurements by direct gamma assay can now provide a record of changing concentrations in lake sediments sufficiently reliable and precise to form a suitable basis for age/depth and dry-sedimentation-rate calculations. There are additional benefits in terms of non destructive sample preparation and simultaneous assay for other environmentally significant gamma-emitting radioisotopes (e.g. 137Cs and 241Am). Results from L. Fleet, S. W. Scotland illustrate the value of this approach especially in lakes with disturbed catchments where variable input of supported 210Pb has occurred.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00026640
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