Publication_Knapp_etal_2010_PPEES 0 4006

Projekt
Department BZF
Beschreibung
Documents on historical floras provide unique opportunities to analyze past changes and to show
trends in biodiversity. We studied the historical and recent flora of the city of Halle in Central Germany.
Our earliest records date back to the year 1687; the youngest were sampled in 2008. More than 20 other
floras provide information for time in-between, covering ca. 320 years in total. We checked all historical
plant occurrences for plausibility. The species turnover of 22% that took place in the study period should
also yield changes in the functional composition of the flora. We identified native species and
archaeophytes that went extinct since 1689 and 1856, respectively, and all neophytes that were
introduced since 1689 or 1856. This ‘double’ calculation minimized the influence of so-called possible
pseudo-absences. Contingency tables assisted to identify trait states which were associated with
extinction or introduction. Time-series analysis identified temporal trends in trait state ratio
development after testing for temporal autocorrelation. Within the study period, species of bogs,
nitrogen-poor habitats or plants with helomorphic leaves got extinct more often than expected by
chance. Species dispersed by humans, plants preferring nitrogen-rich or warm habitats, shrubs and
trees, and species with mesomorphic leaves were, amongst others, over-represented among introduced
neophytes. Land-use changes such as the transformation from agriculture to urban land use or the
drainage of bogs are discussed as main drivers of these developments. Additionally, climatic changes,
contamination of habitats and gardeners’ preferences for specific plants are presumed to having caused
floristic changes. Our study shows the vast influence humans had and still have on biodiversity by
intentionally or unintentionally selecting specific functional plant types and thus changing the
composition of the flora.
Größe
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Metadaten Kataloge
Dublin Core
URI
http://www.ufz.de/record/dmp/archive/4006
Thema
Species list
Geltungsbereich
City of Halle (Saale), Central Germany
Datenart
Text
Datensatz (in einem definierten Format strukturierte Daten)
Datenqualität
qualitätsgesicherte Daten
Datenstatus
bearbeitete Daten
Datenformat
pdf
xlsx
Urheber
Knapp, Sonja
Beitragende
Kühn, Ingolf; Stolle, Jens; Klotz, Stefan
Herausgeber
Helmholtz-Zentrum für Umweltforschung
Rechteinhaber
Helmholtz-Zentrum für Umweltforschung
Rübel Foundation, ETH Zürich. Published by Elsevier GmbH (printed version of the article)
Kontakt
Sonja Knapp (sonja.knapp@ufz.de)
Zeitpunkt oder -bereich der Erzeugung der Daten
1687 - 2008
Sprache des Inhalts
Englisch
Zielgruppe
Ecologists
Zugriffsrechte
freier Zugriff