Vegetation invasions into absolute desert: A 45 000 yr rodent midden record from the Calama-Salar de Atacama basins, northern Chile (lat 22°-24°S)

Claudio Latorre, Julio L. Betancourt, Kate A. Rylander, Jay Quade

Research output: Contribution to journalArticle

131 Citations (Scopus)

Abstract

Plant macrofossils, percentage abundance of grass taxa, fecal-pellet δ13C, and plant-cuticle contents from 49 fossil rodent middens dated by 14C record changes in local vegetation and precipitation since 45 ka (calibrated or measured to thousands of calendar years before present) in the central Atacama Desert (lat 22°-24°S) of northern Chile. The midden sites are along the hyperarid upper margin (2400-3100 m) of the "absolute desert," in an extreme environment sparsely vegetated by annual herbs and halophytic shrubs. Conditions between 40 and 22 ka may have been at least intermittently dry, and possibly cooler, as implied by four middens with low species richness. We infer a large increase in summer rainfall between 16.2 and 10.5 ka on the basis of the lowering of steppe grasses by as much as 1000 m, prominence of C4 grasses and summer annuals, high species richness, and displacement of northern species at least 50 km south of their modern ranges. The precipitation increase was greatest for a cluster of middens between 11.8 and 10.5 ka. Abrupt drying, evident in a dramatic decrease in grass abundance, occurred after 10.5 ka at all four midden localities. Increased percentages of grass, higher species richness, and extralocal taxa record slightly wetter conditions between 7.1 and 3.5 ka. The present hyperarid conditions were established after 3 ka. Present-day variability of summer precipitation in the central Atacama Desert and adjacent Altiplano is related to the intensity and position of upper air circulation anomalies, which in turn respond to Pacific sea-surface temperature anomalies. Summer insolation over the central Andes (lat 20°S) was at its minimum during the latest glacial to early Holocene transition, so regional insolation forcing cannot account for intensified pluvial conditions in the central Atacama. Summer precipitation collapsed abruptly between 10.5 and 10 ka, indicating either nonlinear relationships with seasonal insolation or a change in intensity of upper air circulation over the Altiplano, effectively blocking moisture transport to the Atacama Desert. Here, we suggest that precipitation variations on millennial time scales in the central Atacama are the result of extraregional forcing of the South American Summer Monsoon through intensified Walker Circulation (stronger easterlies) and La Niña-like conditions operating through insolation anomalies (i.e., departures in insolation values) directly over central Asia and the equatorial Pacific.

Original languageEnglish (US)
Pages (from-to)349-366
Number of pages18
JournalBulletin of the Geological Society of America
Volume114
Issue number3
DOIs
StatePublished - Mar 2002
Externally publishedYes

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midden
rodent
insolation
desert
grass
vegetation
summer
basin
species richness
anomaly
Walker circulation
fecal pellet
air
cuticle
late glacial
steppe
temperature anomaly
herb
monsoon
shrub

Keywords

  • Atacama Desert
  • Late Quaternary
  • Middens
  • Monsoons
  • Northern Chile
  • Paleoecology

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Vegetation invasions into absolute desert : A 45 000 yr rodent midden record from the Calama-Salar de Atacama basins, northern Chile (lat 22°-24°S). / Latorre, Claudio; Betancourt, Julio L.; Rylander, Kate A.; Quade, Jay.

In: Bulletin of the Geological Society of America, Vol. 114, No. 3, 03.2002, p. 349-366.

Research output: Contribution to journalArticle

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abstract = "Plant macrofossils, percentage abundance of grass taxa, fecal-pellet δ13C, and plant-cuticle contents from 49 fossil rodent middens dated by 14C record changes in local vegetation and precipitation since 45 ka (calibrated or measured to thousands of calendar years before present) in the central Atacama Desert (lat 22°-24°S) of northern Chile. The midden sites are along the hyperarid upper margin (2400-3100 m) of the {"}absolute desert,{"} in an extreme environment sparsely vegetated by annual herbs and halophytic shrubs. Conditions between 40 and 22 ka may have been at least intermittently dry, and possibly cooler, as implied by four middens with low species richness. We infer a large increase in summer rainfall between 16.2 and 10.5 ka on the basis of the lowering of steppe grasses by as much as 1000 m, prominence of C4 grasses and summer annuals, high species richness, and displacement of northern species at least 50 km south of their modern ranges. The precipitation increase was greatest for a cluster of middens between 11.8 and 10.5 ka. Abrupt drying, evident in a dramatic decrease in grass abundance, occurred after 10.5 ka at all four midden localities. Increased percentages of grass, higher species richness, and extralocal taxa record slightly wetter conditions between 7.1 and 3.5 ka. The present hyperarid conditions were established after 3 ka. Present-day variability of summer precipitation in the central Atacama Desert and adjacent Altiplano is related to the intensity and position of upper air circulation anomalies, which in turn respond to Pacific sea-surface temperature anomalies. Summer insolation over the central Andes (lat 20°S) was at its minimum during the latest glacial to early Holocene transition, so regional insolation forcing cannot account for intensified pluvial conditions in the central Atacama. Summer precipitation collapsed abruptly between 10.5 and 10 ka, indicating either nonlinear relationships with seasonal insolation or a change in intensity of upper air circulation over the Altiplano, effectively blocking moisture transport to the Atacama Desert. Here, we suggest that precipitation variations on millennial time scales in the central Atacama are the result of extraregional forcing of the South American Summer Monsoon through intensified Walker Circulation (stronger easterlies) and La Ni{\~n}a-like conditions operating through insolation anomalies (i.e., departures in insolation values) directly over central Asia and the equatorial Pacific.",
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