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          Institute: MPI für Evolutionsbiologie     Collection: Tropical ecology     Display Documents

ID: 173927.0, MPI für Evolutionsbiologie / Tropical ecology
Teleconnection between tree growth in the Amazonian floodplains and the El Niño-Southern Oscillation effect
Authors:Schöngart, Jochen; Junk, Wolfgang J.; Piedade, Maria Teresa F.; Ayres, José Marcio; Hüttermann, Aloys; Worbes, Martin
Date of Publication (YYYY-MM-DD):2004-05
Title of Journal:Global Change Biology
Issue / Number:5
Start Page:683
End Page:692
Review Status:not specified
Audience:Not Specified
Abstract / Description:There is a limited knowledge about the El Niño-Southern Oscillation (ENSO) effects on the Amazon basin, the world's largest tropical rain forest and a major factor in the global carbon cycle. Seasonal precipitation in the Andean watershed annually causes a several month-long inundation of the floodplains along the Amazon River that induces the formation of annual rings in trees of the flooded forests. Radial growth of trees is mainly restricted to the nonflooded period and thus the ring width corresponds to its duration. This allows the construction of a tree-ring chronology of the long-living hardwood species Piranhea trifoliata Baill. (Euphorbiaceae). El Niño causes anomalously low precipitation in the catchment that results in a significantly lower water discharge of the Amazon River and consequently in an extension of the vegetation period. In those years tree rings are significantly wider. Thus the tree-ring record can be considered as a robust indicator reflecting the mean climate conditions of the whole Western Amazon basin. We present a more than 200-year long chronology, which is the first ENSO-sensitive dendroclimatic proxy of the Amazon basin and permits the dating of preinstrumental El Niño events. Time series analyses of our data indicate that during the last two centuries the severity of El Niño increased significantly.
Free Keywords:Amazon; annual tree rings; dendrochronology; El Niño-Southern Oscillation; floodplain forest; paleoclimatology
External Publication Status:published
Document Type:Article
Communicated by:Pia Parolin
Affiliations:MPI für Limnologie/AG Tropenökologie
External Affiliations:Institute of Agronomy in the Tropics, University of Göttingen, Grisebachstrasse 6, 37077 Göttingen, Germany; Instituto Nacional de Pesquisas da Amazônia (INPA), CP 478, 69.011-970 Manaus, AM, Brazil; Instituto de Desenvolvimento Sustentável Mamirauá, CP 38, 69.470-000 Tefé, AM, Brazil; Institute of Forest Botany, University of Göttingen, Büsgenweg 2, 37077 Göttingen, Germany
Identifiers:ISSN:1354-1013 [ID-No:1]
DOI:10.1111/j.1529-8817.2003.00754.x [ID-No:2]
LOCALID:2285/S 38160 [Listen-Nummer/S-Nummer]
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