Late-glacial pollen and diatom changes in response to two different environmental perturbations: volcanic eruption and Younger Dryas cooling
Identifieur interne : 001A06 ( Istex/Corpus ); précédent : 001A05; suivant : 001A07Late-glacial pollen and diatom changes in response to two different environmental perturbations: volcanic eruption and Younger Dryas cooling
Auteurs : A. F. Lotter ; H. J. B. Birks ; B. ZolitschkaSource :
- Journal of Paleolimnology [ 0921-2728 ] ; 1995-07-01.
Abstract
Abstract: A high-resolution pollen and diatom stratigraphy has been studied from late-glacial annually laminated sediments of Holzmaar (425 m a.s.l., Germany). The sediment sequence studied comprises 475 varves and includes two environmental perturbations of different type and duration: the short, abrupt deposition of the late Allerød tephra layer of the Laacher See volcano (LST, 11 000 yr B.P.), and the more gradual onset of the 'Younger Dryas climatic cooling. Numerical analyses involving (partial) redundancy analyses in connection with Monte Carlo permutation tests suggest that the deposition of 78 mm of Laacher See Tephra had a statistically significant effect on the pollen stratigraphy (percentage and accumulation rates), most probably because of the proximity of the site to the volcano. The diatom accumulation rates also show a statistically significant change, whereas the diatom percentage data do not change significantly. The between-sample rates-of-change in both biostratigraphies are higher at and just after the LST event than at the transition to the Younger Dryas biozone. Sequence splitting of pollen and diatom accumulation rate data also shows a clustering of significant splits at the LST event. A close correlation between changes in the pollen and diatom percentage data for the investigated time-interval suggests a common underlying climatic signal, whereas the accumulation rates of both biostratigraphies behave more individualistically and show more short-term variability due, in part, to the inherent noise in the two data sets. Variance partitioning shows that the local pollen and diatom assemblage zones explain much of the variance in the data-sets. Statistical modelling using redundancy analysis shows that the changes in the diatom assemblages are best predicted by the Younger Dryas biozone and the main changes in the pollen stratigraphy (as represented by the first PCA axis of the pollen data). The results suggest that the biostratigraphies studied at Holzmaar reflect generally stable systems which were disturbed by the deposition of the Laacher See Tephra. After a phase of recovery both systems again reached a new phase of stability prior to the long-term Younger Dryas climatic deterioration that perturbed the assemblages again. The very close and statistically significant parallelism between the major stratigraphical patterns in the pollen and diatom percentage data highlights the responses of the two biological systems to environmental perturbations at different temporal scales.
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DOI: 10.1007/BF00682592
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Late-glacial pollen and diatom changes in response to two different environmental perturbations: volcanic eruption and Younger Dryas cooling</title><author><name sortKey="Lotter, A F" sort="Lotter, A F" uniqKey="Lotter A" first="A. F." last="Lotter">A. F. Lotter</name><affiliation><mods:affiliation>Swiss Federal Institute for Environmental Science and Technology (EAWAG), CH-8600, Dübendorf, Switzerland</mods:affiliation></affiliation><affiliation><mods:affiliation>Geobotanik, Universität Bern, CH-3013, Bern, Switzerland</mods:affiliation></affiliation></author><author><name sortKey="Birks, H J B" sort="Birks, H J B" uniqKey="Birks H" first="H. J. B." last="Birks">H. J. B. Birks</name><affiliation><mods:affiliation>Botanical Institute, University of Bergen, Allégaten 41, N-5007, Bergen, Norway</mods:affiliation></affiliation><affiliation><mods:affiliation>Environmental Change Research Centre, University College London, 26 Bedford Way, WC1H 0AP, London, UK</mods:affiliation></affiliation></author><author><name sortKey="Zolitschka, B" sort="Zolitschka, B" uniqKey="Zolitschka B" first="B." last="Zolitschka">B. 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F." last="Lotter">A. F. Lotter</name><affiliation><mods:affiliation>Swiss Federal Institute for Environmental Science and Technology (EAWAG), CH-8600, Dübendorf, Switzerland</mods:affiliation></affiliation><affiliation><mods:affiliation>Geobotanik, Universität Bern, CH-3013, Bern, Switzerland</mods:affiliation></affiliation></author><author><name sortKey="Birks, H J B" sort="Birks, H J B" uniqKey="Birks H" first="H. J. B." last="Birks">H. J. B. Birks</name><affiliation><mods:affiliation>Botanical Institute, University of Bergen, Allégaten 41, N-5007, Bergen, Norway</mods:affiliation></affiliation><affiliation><mods:affiliation>Environmental Change Research Centre, University College London, 26 Bedford Way, WC1H 0AP, London, UK</mods:affiliation></affiliation></author><author><name sortKey="Zolitschka, B" sort="Zolitschka, B" uniqKey="Zolitschka B" first="B." last="Zolitschka">B. Zolitschka</name><affiliation><mods:affiliation>Fachbereich VI, Geologie, Universität Trier, D-54286, Trier, Germany</mods:affiliation></affiliation><affiliation><mods:affiliation>GeoForschungsZentrum, Telegrafenberg A26, D-14473, Potsdam, Germany</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Paleolimnology</title><title level="j" type="abbrev">J Paleolimnol</title><idno type="ISSN">0921-2728</idno><idno type="eISSN">1573-0417</idno><imprint><publisher>Kluwer Academic Publishers</publisher><pubPlace>Dordrecht</pubPlace><date type="published" when="1995-07-01">1995-07-01</date><biblScope unit="volume">14</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="23">23</biblScope><biblScope unit="page" to="47">47</biblScope></imprint><idno type="ISSN">0921-2728</idno></series><idno type="istex">E863E9B6430DAA8E0F2084CBCE68A12309243B50</idno><idno type="DOI">10.1007/BF00682592</idno><idno type="ArticleID">BF00682592</idno><idno type="ArticleID">Art2</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0921-2728</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: A high-resolution pollen and diatom stratigraphy has been studied from late-glacial annually laminated sediments of Holzmaar (425 m a.s.l., Germany). The sediment sequence studied comprises 475 varves and includes two environmental perturbations of different type and duration: the short, abrupt deposition of the late Allerød tephra layer of the Laacher See volcano (LST, 11 000 yr B.P.), and the more gradual onset of the 'Younger Dryas climatic cooling. Numerical analyses involving (partial) redundancy analyses in connection with Monte Carlo permutation tests suggest that the deposition of 78 mm of Laacher See Tephra had a statistically significant effect on the pollen stratigraphy (percentage and accumulation rates), most probably because of the proximity of the site to the volcano. The diatom accumulation rates also show a statistically significant change, whereas the diatom percentage data do not change significantly. The between-sample rates-of-change in both biostratigraphies are higher at and just after the LST event than at the transition to the Younger Dryas biozone. Sequence splitting of pollen and diatom accumulation rate data also shows a clustering of significant splits at the LST event. A close correlation between changes in the pollen and diatom percentage data for the investigated time-interval suggests a common underlying climatic signal, whereas the accumulation rates of both biostratigraphies behave more individualistically and show more short-term variability due, in part, to the inherent noise in the two data sets. Variance partitioning shows that the local pollen and diatom assemblage zones explain much of the variance in the data-sets. Statistical modelling using redundancy analysis shows that the changes in the diatom assemblages are best predicted by the Younger Dryas biozone and the main changes in the pollen stratigraphy (as represented by the first PCA axis of the pollen data). The results suggest that the biostratigraphies studied at Holzmaar reflect generally stable systems which were disturbed by the deposition of the Laacher See Tephra. After a phase of recovery both systems again reached a new phase of stability prior to the long-term Younger Dryas climatic deterioration that perturbed the assemblages again. The very close and statistically significant parallelism between the major stratigraphical patterns in the pollen and diatom percentage data highlights the responses of the two biological systems to environmental perturbations at different temporal scales.</div></front></TEI><istex><corpusName>springer</corpusName><author><json:item><name>A. F. Lotter</name><affiliations><json:string>Swiss Federal Institute for Environmental Science and Technology (EAWAG), CH-8600, Dübendorf, Switzerland</json:string><json:string>Geobotanik, Universität Bern, CH-3013, Bern, Switzerland</json:string></affiliations></json:item><json:item><name>H. J. B. Birks</name><affiliations><json:string>Botanical Institute, University of Bergen, Allégaten 41, N-5007, Bergen, Norway</json:string><json:string>Environmental Change Research Centre, University College London, 26 Bedford Way, WC1H 0AP, London, UK</json:string></affiliations></json:item><json:item><name>B. Zolitschka</name><affiliations><json:string>Fachbereich VI, Geologie, Universität Trier, D-54286, Trier, Germany</json:string><json:string>GeoForschungsZentrum, Telegrafenberg A26, D-14473, Potsdam, Germany</json:string></affiliations></json:item></author><articleId><json:string>BF00682592</json:string><json:string>Art2</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>OriginalPaper</json:string></originalGenre><abstract>Abstract: A high-resolution pollen and diatom stratigraphy has been studied from late-glacial annually laminated sediments of Holzmaar (425 m a.s.l., Germany). The sediment sequence studied comprises 475 varves and includes two environmental perturbations of different type and duration: the short, abrupt deposition of the late Allerød tephra layer of the Laacher See volcano (LST, 11 000 yr B.P.), and the more gradual onset of the 'Younger Dryas climatic cooling. Numerical analyses involving (partial) redundancy analyses in connection with Monte Carlo permutation tests suggest that the deposition of 78 mm of Laacher See Tephra had a statistically significant effect on the pollen stratigraphy (percentage and accumulation rates), most probably because of the proximity of the site to the volcano. The diatom accumulation rates also show a statistically significant change, whereas the diatom percentage data do not change significantly. The between-sample rates-of-change in both biostratigraphies are higher at and just after the LST event than at the transition to the Younger Dryas biozone. Sequence splitting of pollen and diatom accumulation rate data also shows a clustering of significant splits at the LST event. A close correlation between changes in the pollen and diatom percentage data for the investigated time-interval suggests a common underlying climatic signal, whereas the accumulation rates of both biostratigraphies behave more individualistically and show more short-term variability due, in part, to the inherent noise in the two data sets. Variance partitioning shows that the local pollen and diatom assemblage zones explain much of the variance in the data-sets. Statistical modelling using redundancy analysis shows that the changes in the diatom assemblages are best predicted by the Younger Dryas biozone and the main changes in the pollen stratigraphy (as represented by the first PCA axis of the pollen data). The results suggest that the biostratigraphies studied at Holzmaar reflect generally stable systems which were disturbed by the deposition of the Laacher See Tephra. After a phase of recovery both systems again reached a new phase of stability prior to the long-term Younger Dryas climatic deterioration that perturbed the assemblages again. The very close and statistically significant parallelism between the major stratigraphical patterns in the pollen and diatom percentage data highlights the responses of the two biological systems to environmental perturbations at different temporal scales.</abstract><qualityIndicators><score>8</score><pdfVersion>1.3</pdfVersion><pdfPageSize>555 x 735 pts</pdfPageSize><refBibsNative>false</refBibsNative><keywordCount>0</keywordCount><abstractCharCount>2545</abstractCharCount><pdfWordCount>9801</pdfWordCount><pdfCharCount>60931</pdfCharCount><pdfPageCount>25</pdfPageCount><abstractWordCount>374</abstractWordCount></qualityIndicators><title>Late-glacial pollen and diatom changes in response to two different environmental perturbations: volcanic eruption and Younger Dryas cooling</title><refBibs><json:item><author><json:item><name>S,E B Abella</name></json:item></author><host><volume>33</volume><pages><last>1385</last><first>1376</first></pages><author></author><title>Limnol. 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NATO ASI Series 1</title><publicationDate>1992</publicationDate></host><title>Younger Dryas oscillation -varve dated microstratigraphic, palynological and palaeomagnetic records from Lake Holzmaar, Germany</title><publicationDate>1992</publicationDate></json:item></refBibs><genre><json:string>research-article</json:string></genre><host><volume>14</volume><pages><last>47</last><first>23</first></pages><issn><json:string>0921-2728</json:string></issn><issue>1</issue><subject><json:item><value>Geosciences, general</value></json:item><json:item><value>Hydrogeology</value></json:item><json:item><value>Meteorology/Climatology</value></json:item><json:item><value>Sedimentology</value></json:item><json:item><value>Hydrobiology</value></json:item></subject><journalId><json:string>10933</json:string></journalId><genre><json:string>journal</json:string></genre><language><json:string>unknown</json:string></language><eissn><json:string>1573-0417</json:string></eissn><title>Journal of Paleolimnology</title><publicationDate>1995</publicationDate><copyrightDate>1995</copyrightDate></host><categories><wos><json:string>science</json:string><json:string>limnology</json:string><json:string>geosciences, multidisciplinary</json:string><json:string>environmental sciences</json:string></wos><scienceMetrix><json:string>natural sciences</json:string><json:string>earth & environmental sciences</json:string><json:string>paleontology</json:string></scienceMetrix></categories><publicationDate>1995</publicationDate><copyrightDate>1995</copyrightDate><doi><json:string>10.1007/BF00682592</json:string></doi><id>E863E9B6430DAA8E0F2084CBCE68A12309243B50</id><score>0.31029934</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/E863E9B6430DAA8E0F2084CBCE68A12309243B50/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/E863E9B6430DAA8E0F2084CBCE68A12309243B50/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/E863E9B6430DAA8E0F2084CBCE68A12309243B50/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">Late-glacial pollen and diatom changes in response to two different environmental perturbations: volcanic eruption and Younger Dryas cooling</title><respStmt><resp>Références bibliographiques récupérées via GROBID</resp><name resp="ISTEX-API">ISTEX-API (INIST-CNRS)</name></respStmt><respStmt><resp>Références bibliographiques récupérées via GROBID</resp><name resp="ISTEX-API">ISTEX-API (INIST-CNRS)</name></respStmt></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>Kluwer Academic Publishers</publisher><pubPlace>Dordrecht</pubPlace><availability><p>Kluwer Academic Publishers, 1995</p></availability><date>1994-08-07</date></publicationStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Late-glacial pollen and diatom changes in response to two different environmental perturbations: volcanic eruption and Younger Dryas cooling</title><author xml:id="author-1"><persName><forename type="first">A.</forename><surname>Lotter</surname></persName><affiliation>Swiss Federal Institute for Environmental Science and Technology (EAWAG), CH-8600, Dübendorf, Switzerland</affiliation><affiliation>Geobotanik, Universität Bern, CH-3013, Bern, Switzerland</affiliation></author><author xml:id="author-2"><persName><forename type="first">H.</forename><surname>Birks</surname></persName><affiliation>Botanical Institute, University of Bergen, Allégaten 41, N-5007, Bergen, Norway</affiliation><affiliation>Environmental Change Research Centre, University College London, 26 Bedford Way, WC1H 0AP, London, UK</affiliation></author><author xml:id="author-3"><persName><forename type="first">B.</forename><surname>Zolitschka</surname></persName><affiliation>Fachbereich VI, Geologie, Universität Trier, D-54286, Trier, Germany</affiliation><affiliation>GeoForschungsZentrum, Telegrafenberg A26, D-14473, Potsdam, Germany</affiliation></author></analytic><monogr><title level="j">Journal of Paleolimnology</title><title level="j" type="abbrev">J Paleolimnol</title><idno type="journal-ID">10933</idno><idno type="pISSN">0921-2728</idno><idno type="eISSN">1573-0417</idno><idno type="issue-article-count">9</idno><idno type="volume-issue-count">3</idno><imprint><publisher>Kluwer Academic Publishers</publisher><pubPlace>Dordrecht</pubPlace><date type="published" when="1995-07-01"></date><biblScope unit="volume">14</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="23">23</biblScope><biblScope unit="page" to="47">47</biblScope></imprint></monogr><idno type="istex">E863E9B6430DAA8E0F2084CBCE68A12309243B50</idno><idno type="DOI">10.1007/BF00682592</idno><idno type="ArticleID">BF00682592</idno><idno type="ArticleID">Art2</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1994-08-07</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Abstract: A high-resolution pollen and diatom stratigraphy has been studied from late-glacial annually laminated sediments of Holzmaar (425 m a.s.l., Germany). The sediment sequence studied comprises 475 varves and includes two environmental perturbations of different type and duration: the short, abrupt deposition of the late Allerød tephra layer of the Laacher See volcano (LST, 11 000 yr B.P.), and the more gradual onset of the 'Younger Dryas climatic cooling. Numerical analyses involving (partial) redundancy analyses in connection with Monte Carlo permutation tests suggest that the deposition of 78 mm of Laacher See Tephra had a statistically significant effect on the pollen stratigraphy (percentage and accumulation rates), most probably because of the proximity of the site to the volcano. The diatom accumulation rates also show a statistically significant change, whereas the diatom percentage data do not change significantly. The between-sample rates-of-change in both biostratigraphies are higher at and just after the LST event than at the transition to the Younger Dryas biozone. Sequence splitting of pollen and diatom accumulation rate data also shows a clustering of significant splits at the LST event. A close correlation between changes in the pollen and diatom percentage data for the investigated time-interval suggests a common underlying climatic signal, whereas the accumulation rates of both biostratigraphies behave more individualistically and show more short-term variability due, in part, to the inherent noise in the two data sets. Variance partitioning shows that the local pollen and diatom assemblage zones explain much of the variance in the data-sets. Statistical modelling using redundancy analysis shows that the changes in the diatom assemblages are best predicted by the Younger Dryas biozone and the main changes in the pollen stratigraphy (as represented by the first PCA axis of the pollen data). The results suggest that the biostratigraphies studied at Holzmaar reflect generally stable systems which were disturbed by the deposition of the Laacher See Tephra. After a phase of recovery both systems again reached a new phase of stability prior to the long-term Younger Dryas climatic deterioration that perturbed the assemblages again. The very close and statistically significant parallelism between the major stratigraphical patterns in the pollen and diatom percentage data highlights the responses of the two biological systems to environmental perturbations at different temporal scales.</p></abstract><textClass><keywords scheme="Journal Subject"><list><head>Environment</head><item><term>Geosciences, general</term></item><item><term>Hydrogeology</term></item><item><term>Meteorology/Climatology</term></item><item><term>Sedimentology</term></item><item><term>Hydrobiology</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="1994-08-07">Created</change><change when="1995-07-01">Published</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2016-11-22">References added</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2017-01-20">References added</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/E863E9B6430DAA8E0F2084CBCE68A12309243B50/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Springer, Publisher found" wicri:toSee="no header"><istex:xmlDeclaration>version="1.0" encoding="UTF-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//Springer-Verlag//DTD A++ V2.4//EN" URI="http://devel.springer.de/A++/V2.4/DTD/A++V2.4.dtd" name="istex:docType"></istex:docType><istex:document><Publisher><PublisherInfo><PublisherName>Kluwer Academic Publishers</PublisherName><PublisherLocation>Dordrecht</PublisherLocation></PublisherInfo><Journal><JournalInfo JournalProductType="ArchiveJournal" NumberingStyle="Unnumbered"><JournalID>10933</JournalID><JournalPrintISSN>0921-2728</JournalPrintISSN><JournalElectronicISSN>1573-0417</JournalElectronicISSN><JournalTitle>Journal of Paleolimnology</JournalTitle><JournalAbbreviatedTitle>J Paleolimnol</JournalAbbreviatedTitle><JournalSubjectGroup><JournalSubject Type="Primary">Environment</JournalSubject><JournalSubject Type="Secondary">Geosciences, general</JournalSubject><JournalSubject Type="Secondary">Hydrogeology</JournalSubject><JournalSubject Type="Secondary">Meteorology/Climatology</JournalSubject><JournalSubject Type="Secondary">Sedimentology</JournalSubject><JournalSubject Type="Secondary">Hydrobiology</JournalSubject></JournalSubjectGroup></JournalInfo><Volume><VolumeInfo VolumeType="Regular" TocLevels="0"><VolumeIDStart>14</VolumeIDStart><VolumeIDEnd>14</VolumeIDEnd><VolumeIssueCount>3</VolumeIssueCount></VolumeInfo><Issue IssueType="Regular"><IssueInfo TocLevels="0"><IssueIDStart>1</IssueIDStart><IssueIDEnd>1</IssueIDEnd><IssueArticleCount>9</IssueArticleCount><IssueHistory><CoverDate><Year>1995</Year><Month>7</Month></CoverDate></IssueHistory><IssueCopyright><CopyrightHolderName>Kluwer Academic Publishers</CopyrightHolderName><CopyrightYear>1995</CopyrightYear></IssueCopyright></IssueInfo><Article ID="Art2"><ArticleInfo Language="En" ArticleType="OriginalPaper" NumberingStyle="Unnumbered" TocLevels="0" ContainsESM="No"><ArticleID>BF00682592</ArticleID><ArticleDOI>10.1007/BF00682592</ArticleDOI><ArticleSequenceNumber>2</ArticleSequenceNumber><ArticleTitle Language="En">Late-glacial pollen and diatom changes in response to two different environmental perturbations: volcanic eruption and Younger Dryas cooling</ArticleTitle><ArticleFirstPage>23</ArticleFirstPage><ArticleLastPage>47</ArticleLastPage><ArticleHistory><RegistrationDate><Year>2004</Year><Month>11</Month><Day>6</Day></RegistrationDate><Received><Year>1994</Year><Month>8</Month><Day>7</Day></Received><Accepted><Year>1994</Year><Month>12</Month><Day>11</Day></Accepted></ArticleHistory><ArticleCopyright><CopyrightHolderName>Kluwer Academic Publishers</CopyrightHolderName><CopyrightYear>1995</CopyrightYear></ArticleCopyright><ArticleGrants Type="Regular"><MetadataGrant Grant="OpenAccess"></MetadataGrant><AbstractGrant Grant="OpenAccess"></AbstractGrant><BodyPDFGrant Grant="Restricted"></BodyPDFGrant><BodyHTMLGrant Grant="Restricted"></BodyHTMLGrant><BibliographyGrant Grant="Restricted"></BibliographyGrant><ESMGrant Grant="Restricted"></ESMGrant></ArticleGrants><ArticleContext><JournalID>10933</JournalID><VolumeIDStart>14</VolumeIDStart><VolumeIDEnd>14</VolumeIDEnd><IssueIDStart>1</IssueIDStart><IssueIDEnd>1</IssueIDEnd></ArticleContext></ArticleInfo><ArticleHeader><AuthorGroup><Author AffiliationIDS="Aff1 Aff2"><AuthorName DisplayOrder="Western"><GivenName>A.</GivenName><GivenName>F.</GivenName><FamilyName>Lotter</FamilyName></AuthorName></Author><Author AffiliationIDS="Aff3 Aff4"><AuthorName DisplayOrder="Western"><GivenName>H.</GivenName><GivenName>J.</GivenName><GivenName>B.</GivenName><FamilyName>Birks</FamilyName></AuthorName></Author><Author AffiliationIDS="Aff5 Aff6"><AuthorName DisplayOrder="Western"><GivenName>B.</GivenName><FamilyName>Zolitschka</FamilyName></AuthorName></Author><Affiliation ID="Aff1"><OrgName>Swiss Federal Institute for Environmental Science and Technology (EAWAG)</OrgName><OrgAddress><Postcode>CH-8600</Postcode><City>Dübendorf</City><Country>Switzerland</Country></OrgAddress></Affiliation><Affiliation ID="Aff2"><OrgName>Geobotanik, Universität Bern</OrgName><OrgAddress><Postcode>CH-3013</Postcode><City>Bern</City><Country>Switzerland</Country></OrgAddress></Affiliation><Affiliation ID="Aff3"><OrgDivision>Botanical Institute</OrgDivision><OrgName>University of Bergen</OrgName><OrgAddress><Street>Allégaten 41</Street><Postcode>N-5007</Postcode><City>Bergen</City><Country>Norway</Country></OrgAddress></Affiliation><Affiliation ID="Aff4"><OrgDivision>Environmental Change Research Centre</OrgDivision><OrgName>University College London</OrgName><OrgAddress><Street>26 Bedford Way</Street><Postcode>WC1H 0AP</Postcode><City>London</City><Country>UK</Country></OrgAddress></Affiliation><Affiliation ID="Aff5"><OrgDivision>Fachbereich VI, Geologie</OrgDivision><OrgName>Universität Trier</OrgName><OrgAddress><Postcode>D-54286</Postcode><City>Trier</City><Country>Germany</Country></OrgAddress></Affiliation><Affiliation ID="Aff6"><OrgName>GeoForschungsZentrum</OrgName><OrgAddress><Street>Telegrafenberg A26</Street><Postcode>D-14473</Postcode><City>Potsdam</City><Country>Germany</Country></OrgAddress></Affiliation></AuthorGroup><Abstract ID="Abs1" Language="En"><Heading>Abstract</Heading><Para>A high-resolution pollen and diatom stratigraphy has been studied from late-glacial annually laminated sediments of Holzmaar (425 m a.s.l., Germany). The sediment sequence studied comprises 475 varves and includes two environmental perturbations of different type and duration: the short, abrupt deposition of the late Allerød tephra layer of the Laacher See volcano (LST, 11 000 yr B.P.), and the more gradual onset of the 'Younger Dryas climatic cooling.</Para><Para>Numerical analyses involving (partial) redundancy analyses in connection with Monte Carlo permutation tests suggest that the deposition of 78 mm of Laacher See Tephra had a statistically significant effect on the pollen stratigraphy (percentage and accumulation rates), most probably because of the proximity of the site to the volcano. The diatom accumulation rates also show a statistically significant change, whereas the diatom percentage data do not change significantly. The between-sample rates-of-change in both biostratigraphies are higher at and just after the LST event than at the transition to the Younger Dryas biozone. Sequence splitting of pollen and diatom accumulation rate data also shows a clustering of significant splits at the LST event. A close correlation between changes in the pollen and diatom percentage data for the investigated time-interval suggests a common underlying climatic signal, whereas the accumulation rates of both biostratigraphies behave more individualistically and show more short-term variability due, in part, to the inherent noise in the two data sets. Variance partitioning shows that the local pollen and diatom assemblage zones explain much of the variance in the data-sets. Statistical modelling using redundancy analysis shows that the changes in the diatom assemblages are best predicted by the Younger Dryas biozone and the main changes in the pollen stratigraphy (as represented by the first PCA axis of the pollen data).</Para><Para>The results suggest that the biostratigraphies studied at Holzmaar reflect generally stable systems which were disturbed by the deposition of the Laacher See Tephra. After a phase of recovery both systems again reached a new phase of stability prior to the long-term Younger Dryas climatic deterioration that perturbed the assemblages again. The very close and statistically significant parallelism between the major stratigraphical patterns in the pollen and diatom percentage data highlights the responses of the two biological systems to environmental perturbations at different temporal scales.</Para></Abstract><KeywordGroup Language="En"><Heading>Key words</Heading><Keyword>Younger Dryas</Keyword><Keyword>pollen</Keyword><Keyword>diatoms</Keyword><Keyword>varves</Keyword><Keyword>laminated sediment</Keyword><Keyword>Laacher See Tephra</Keyword><Keyword>Holzmaar</Keyword><Keyword>rates of change</Keyword><Keyword>sequence splitting</Keyword><Keyword>variance partitioning</Keyword><Keyword>redundancy analysis</Keyword></KeywordGroup></ArticleHeader><NoBody></NoBody></Article></Issue></Volume></Journal></Publisher></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Late-glacial pollen and diatom changes in response to two different environmental perturbations: volcanic eruption and Younger Dryas cooling</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Late-glacial pollen and diatom changes in response to two different environmental perturbations: volcanic eruption and Younger Dryas cooling</title></titleInfo><name type="personal"><namePart type="given">A.</namePart><namePart type="given">F.</namePart><namePart type="family">Lotter</namePart><affiliation>Swiss Federal Institute for Environmental Science and Technology (EAWAG), CH-8600, Dübendorf, Switzerland</affiliation><affiliation>Geobotanik, Universität Bern, CH-3013, Bern, Switzerland</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">H.</namePart><namePart type="given">J.</namePart><namePart type="given">B.</namePart><namePart type="family">Birks</namePart><affiliation>Botanical Institute, University of Bergen, Allégaten 41, N-5007, Bergen, Norway</affiliation><affiliation>Environmental Change Research Centre, University College London, 26 Bedford Way, WC1H 0AP, London, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">B.</namePart><namePart type="family">Zolitschka</namePart><affiliation>Fachbereich VI, Geologie, Universität Trier, D-54286, Trier, Germany</affiliation><affiliation>GeoForschungsZentrum, Telegrafenberg A26, D-14473, Potsdam, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="OriginalPaper"></genre><originInfo><publisher>Kluwer Academic Publishers</publisher><place><placeTerm type="text">Dordrecht</placeTerm></place><dateCreated encoding="w3cdtf">1994-08-07</dateCreated><dateIssued encoding="w3cdtf">1995-07-01</dateIssued><copyrightDate encoding="w3cdtf">1995</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">Abstract: A high-resolution pollen and diatom stratigraphy has been studied from late-glacial annually laminated sediments of Holzmaar (425 m a.s.l., Germany). The sediment sequence studied comprises 475 varves and includes two environmental perturbations of different type and duration: the short, abrupt deposition of the late Allerød tephra layer of the Laacher See volcano (LST, 11 000 yr B.P.), and the more gradual onset of the 'Younger Dryas climatic cooling. Numerical analyses involving (partial) redundancy analyses in connection with Monte Carlo permutation tests suggest that the deposition of 78 mm of Laacher See Tephra had a statistically significant effect on the pollen stratigraphy (percentage and accumulation rates), most probably because of the proximity of the site to the volcano. The diatom accumulation rates also show a statistically significant change, whereas the diatom percentage data do not change significantly. The between-sample rates-of-change in both biostratigraphies are higher at and just after the LST event than at the transition to the Younger Dryas biozone. Sequence splitting of pollen and diatom accumulation rate data also shows a clustering of significant splits at the LST event. A close correlation between changes in the pollen and diatom percentage data for the investigated time-interval suggests a common underlying climatic signal, whereas the accumulation rates of both biostratigraphies behave more individualistically and show more short-term variability due, in part, to the inherent noise in the two data sets. Variance partitioning shows that the local pollen and diatom assemblage zones explain much of the variance in the data-sets. Statistical modelling using redundancy analysis shows that the changes in the diatom assemblages are best predicted by the Younger Dryas biozone and the main changes in the pollen stratigraphy (as represented by the first PCA axis of the pollen data). The results suggest that the biostratigraphies studied at Holzmaar reflect generally stable systems which were disturbed by the deposition of the Laacher See Tephra. After a phase of recovery both systems again reached a new phase of stability prior to the long-term Younger Dryas climatic deterioration that perturbed the assemblages again. The very close and statistically significant parallelism between the major stratigraphical patterns in the pollen and diatom percentage data highlights the responses of the two biological systems to environmental perturbations at different temporal scales.</abstract><relatedItem type="host"><titleInfo><title>Journal of Paleolimnology</title></titleInfo><titleInfo type="abbreviated"><title>J Paleolimnol</title></titleInfo><genre type="journal" displayLabel="Archive Journal"></genre><originInfo><dateIssued encoding="w3cdtf">1995-07-01</dateIssued><copyrightDate encoding="w3cdtf">1995</copyrightDate></originInfo><subject><genre>Environment</genre><topic>Geosciences, general</topic><topic>Hydrogeology</topic><topic>Meteorology/Climatology</topic><topic>Sedimentology</topic><topic>Hydrobiology</topic></subject><identifier type="ISSN">0921-2728</identifier><identifier type="eISSN">1573-0417</identifier><identifier type="JournalID">10933</identifier><identifier type="IssueArticleCount">9</identifier><identifier type="VolumeIssueCount">3</identifier><part><date>1995</date><detail type="volume"><number>14</number><caption>vol.</caption></detail><detail type="issue"><number>1</number><caption>no.</caption></detail><extent unit="pages"><start>23</start><end>47</end></extent></part><recordInfo><recordOrigin>Kluwer Academic Publishers, 1995</recordOrigin></recordInfo></relatedItem><identifier type="istex">E863E9B6430DAA8E0F2084CBCE68A12309243B50</identifier><identifier type="DOI">10.1007/BF00682592</identifier><identifier type="ArticleID">BF00682592</identifier><identifier type="ArticleID">Art2</identifier><accessCondition type="use and reproduction" contentType="copyright">Kluwer Academic Publishers, 1995</accessCondition><recordInfo><recordContentSource>SPRINGER</recordContentSource><recordOrigin>Kluwer Academic Publishers, 1995</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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