Disentangling the last 1,000 years of human–environment interactions along the eastern side of the southern Andes (34–52°S lat.)

William Nanavati, Cathy Whitlock, Maria Eugenia de Porras, Adolfo Gil, Diego Navarro, Gustavo Neme

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Researchers have long debated the degree to which Native American land use altered landscapes in the Americas prior to European colonization. Human–environment interactions in southern South America are inferred from new pollen and charcoal data from Laguna El Sosneado and their comparison with high-resolution paleoenvironmental records and archaeological/ethnohistorical information at other sites along the eastern Andes of southern Argentina and Chile (34–52°S). The records indicate that humans, by altering ignition frequency and the availability of fuels, variously muted or amplified the effects of climate on fire regimes. For example, fire activity at the northern and southern sites was low at times when the climate and vegetation were suitable for burning but lacked an ignition source. Conversely, abundant fires set by humans and infrequent lightning ignitions occurred during periods when warm, dry climate conditions coincided with ample vegetation (i.e., fuel) at midlatitude sites. Prior to European arrival, changes in Native American demography and land use influenced vegetation and fire regimes locally, but human influences were not widely evident until the 16th century, with the introduction of nonnative species (e.g., horses), and then in the late 19th century, as Euro-Americans targeted specific resources to support local and national economies. The complex interactions between past climate variability, human activities, and ecosystem dynamics at the local scale are overlooked by approaches that infer levels of land use simply from population size or that rely on regionally composited data to detect drivers of past environmental change.

Original languageEnglish (US)
Article numbere2119813119
JournalProceedings of the National Academy of Sciences of the United States of America
Volume119
Issue number9
DOIs
StatePublished - Mar 1 2022

Bibliographical note

Funding Information:
Científicas y Técnicas de Argentina Postgraduate Fellowship (to D.N.); National Science Foundation through Social, Behavioral, and Economic Sciences Postdoctoral Research Fellowship 2004941 (to W.N.); and National Science Foundation Grant 1461590 (to C.W.).

Funding Information:
Drs. Gustavo Villarosa and Valeria Outes made available the Laguna Portezuelo cores, and Drs. Virginia Iglesias and Christopher Schiller assisted with Laguna El Sosneado laboratory work. This material is based upon work supported by a Consejo Nacional de Investigaciones

Publisher Copyright:
© 2022 National Academy of Sciences. All Rights Reserved.

Keywords

  • Fire history
  • Human–environment
  • Paleoecology
  • Southern South America
  • Vegetation history

Continental Scientific Drilling Facility tags

  • APIRE
  • AHVC

PubMed: MeSH publication types

  • Journal Article

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