Climatic Change

, Volume 86, Issue 3, pp 331–356

A 400-year tree-ring record of the Puelo River summer–fall streamflow in the Valdivian Rainforest eco-region, Chile

Article

DOI: 10.1007/s10584-007-9287-7

Cite this article as:
Lara, A., Villalba, R. & Urrutia, R. Climatic Change (2008) 86: 331. doi:10.1007/s10584-007-9287-7

Abstract

The Puelo River is a watershed shared between Chile and Argentina with a mean annual streamflow of 644 m3 s−1. It has a high ecologic and economic importance, including introduced farmed salmon, tourism, sports fishing and projected hydroelectricity. Using Austrocedrus chilensis and Pilgerodendron uviferum tree-ring records we reconstructed summer–fall (December–May) Puelo River streamflow, which is the first of such reconstructions developed in the Pacific domain of South America. The reconstruction goes back to 1599 and has an adjusted r2 of 0.42. Spectral analysis of the reconstructed streamflow shows a dominant 84-year cycle which explains 25.1% of the total temporal variability. The Puelo River summer–fall streamflow shows a significant correlation (P > 0.95, 1943–2002) with hydrological records throughout a vast geographic range within the Valdivian eco-region (35 to 46°S). Seasonal Puelo River interannual streamflow variability is related to large-scale oceanic and atmospheric circulation features. Summer–fall streamflows showed a significant negative correlation with the Antarctic Oscillation (AAO), whereas winter–spring anomalies appear to be positively connected with sea surface temperature variations in the tropical Pacific. In general, above- and below-average discharges in winter–spring are related to El Niño and La Niña events, respectively. The temporal patterns of the observed and reconstructed records of the Puelo River streamflow show a general decreasing trend in the 1943–1999 period. Projected circulation changes for the next decades in the Southern Hemisphere would decrease summer–fall Puelo River streamflows with significant impacts on salmon production, tourism and hydropower generation.

Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Antonio Lara
    • 1
    • 2
  • Ricardo Villalba
    • 3
  • Rocío Urrutia
    • 1
    • 2
  1. 1.Laboratorio de Dendrocronología, Instituto de SilviculturaUniversidad Austral de ChileValdiviaChile
  2. 2.FORECOS Nucleus (Forest Ecosystemic Services to Aquatic Systems under Climatic Fluctuations)Millennium Scientific Initiative Nucleus of the Ministry of PlanningValdiviaChile
  3. 3.Departamento de Dendrocronología e Historia AmbientalInstituto Argentino de Nivología, Glaciología y Ciencias Ambientales, IANIGLAMendozaArgentina