Titre

Early to mid‐Holocene climate change at Lago dell'Accesa (central Italy): climate signal or anthropogenic bias?

Année de publication

2010

Source

Journal of Quaternary Science 25 1239 1247 8

ISSN
0267-8179
Résumé

Despite the high potential of pollen records for climate reconstruction, pollen–climate relationships may be biased due to past and present human activities on the landscape. We use (i) transfer functions based on modern pollen–climate relationships to infer seasonal temperature and summer precipitation for the period 11 500–4500 cal. a BP and (ii) lake‐level change records based on different sedimentary proxies in multiple cores that are mainly indicative for summer hydrology at Lago dell'Accesa (central Italy). Quantitative reconstructions indicate lowest summer precipitation during two phases (8500–7700 cal. a BP and after 6000 cal. a BP) and a gradual winter temperature increase from 11 500 to ca. 8000 cal. a BP. Lowest summer precipitation was reconstructed during these phases characterised by vegetation shifts from open forests dominated by summergreen oaks (Quercus) to forests dominated by evergreen oaks (Quercus ilex), which are at present most abundant where summer drought is stronger. Similarly, the lake‐level record indicates two long‐lasting low summer precipitation phases (8800–7700 and 6400–4400 cal. a BP) that were interrupted by short‐term high summer precipitation events. Based on the broad agreement between the pollen‐inferred summer precipitation and the low‐frequency lake‐level changes, we suggest that the duration of the high summer precipitation events may have been too short to maintain drought‐sensitive trees, which may have been affected by high mortality rates when summer dry conditions returned. Although past and modern pollen–climate relationships may very likely have been affected by human activities since the Neolithic (i.e. when exploitation of the landscape started), we reject the hypothesis of a significant anthropogenic bias in the pollen‐based climate reconstruction. In addition, we suggest that pollen‐based and lake‐level reconstructions may have different inherent abilities of capturing high‐ and low‐frequency precipitation signals. Copyright © 2010 John Wiley & Sons, Ltd.

Type de publication
  • journal
Type de document
  • article
Classification
 
Classification - Inist-CNRS
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
Classification - Scopus
  • 1 - Physical Sciences
  • 2 - Earth and Planetary Sciences
  • 3 - Palaeontology
  • 3 - Earth and Planetary Sciences (miscellaneous)
  • 1 - Social Sciences
  • 2 - Arts and Humanities
  • 3 - Arts and Humanities (miscellaneous)
Classification - Science Metrix
  • 1 - natural sciences
  • 2 - earth & environmental sciences
  • 3 - paleontology
Classification - Clarivate Analytics (Subject Category)
  • 1 - science
  • 2 - geosciences, multidisciplinary
  • 2 - geography, physical
Termes extraits

holocene; quaternary; lago; magny; psmr; precipitation; birks; finsinger; fossil; colombaroli; seppa; vanniere; quaternary science reviews; tjan; human impact; neolithic; human activities; early holocene; anthropogenic; summergreen; climatic; john wiley sons; copyright; tjul; quercus; anthropogenic bias; climate reconstructions; tinner; central italy; ilex; modern training; pwin; pollen records; analogue; pollen data; vegetation; modern pollen assemblages; quaternary research; sediment cores; change record; fossil pollen assemblages; pollen assemblages; climate change; summer precipitation; climate reconstruction; psmr reconstruction; fossil samples; evergreen; webb; water depth; quaternary science; summergreen quercus; vegetation history; southern europe; change records; assemblage; prentice; high abundance; multiple cores; quantitative reconstructions; synthesis change record; empty circles; pollen record; transfer functions; summer moisture availability; modern relationships; vegetation changes; lago record; lake levels; climate signal; pollen; reconstruction; sediment; summer drought; modern pollen; high summer precipitation events; residual distance; lowest summer precipitation; change reconstruction; summer hydrology; individual cores; southern sicily; ilex dominance; agricultural activities; such reconstructions; modern climate; cohmap members; black lines; peat deposits; winter insolation; vegetation composition; quercus ilex; environmental variables; modern assemblages; climate conditions; climate dynamics; landscape openness; summergreen plants; water availability; past climates; winter precipitation; lake shore; holocene climate changes; inference models; surface samples; apparent discrepancy; water stress; italian peninsula; pollenbased climate reconstructions; abundant today; standard errors; loess function; weighted regression; philosophical transactions; last years; lago tuscany; holocene changes; corylus avellana; climatic oscillations; lake accesa; modern lake level

Entité nommée
 
Entité nommée - Emplacement géographique
  • Utrecht
  • Montpellier
  • Switzerland
  • Bern
  • Europe
  • Aix-en-Provence
  • America
  • Croatia
  • Italy
  • Zurich
  • Netherlands
Entité nommée - Organisme
  • Department of Environmental Sciences, Institute of Terrestrial Ecosystems, ETH Zurich, Zurich, Switzerland
  • Geological Institute, ETH Zurich, Zurich, Switzerland
  • COHMAP Members
  • Sons, Ltd.
  • SNF
  • Department of Paleoecology, Institute of Plant Sciences
  • Climate Change University
  • Institute of Environmental Biology, Utrecht University, Laboratory of Palaeobotany and Palynology
  • Sons, Ltd
  • University of Bern
  • Environmental Change Research, Department of Geography, University of Oregon, Eugene, Oregon, USA
  • AXA Research Fund
  • Swiss National Science Foundation
Entité nommée - Personne
R. Hoffmann; Accesa; Psmr; M. Magny; John Wiley; F. Oberli; Auguste Broussonet; W. Finsinger; Orleans Cedex; W. Tanner; To; J. Quaternary; N. CombourieuNebout; Paul Cezanne
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