Pre-Columbian age for North American Corispermum L. (Chenopodiaceae) confirmed by accelerator radiocarbon dating

J. L. Betancourt, A. Long, D. J. Donahue, A.J. Timothy Jull, T. H. Zabel

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Criteria for recognizing alien (historically introduced) plants in continental floras are largely inferential, involving range disjunctions, absence in the first botanical records for a region, pioneer status in secondary successions ('weedy habit'), and, to a lesser extent, the fossil record. Decisions on whether a species is native or introduced commonly appear in local and regional floras. In a few cases, the plant's occurrence in the fossil record has reversed its presumed alien status1. Ironically, the appearance of assumed introduced species in prehistoric contexts could also be taken as an index of modern contamination due to stratigraphical mixing. We now present conclusive evidence for the prehistoric occurrence of Corispermum L. (Chenopodiaceae), a herbaceous annual growing on sandy soils throughout western North America, where it was previously reported as adventive from Eurasia. The use of tandem accelerator mass spectrometry (TAMS) for direct radiocarbon measurement of seeds eliminates problems with stratigraphical mixing and using this method we verify a pre-Columbian age for Corispermum.

Original languageEnglish (US)
Pages (from-to)653-655
Number of pages3
JournalNature
Volume311
Issue number5987
DOIs
StatePublished - 1984

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radiocarbon dating
introduced species
fossil record
flora
secondary succession
accelerator mass spectrometry
native species
sandy soil
seed
North America
decision
index
method
contamination

ASJC Scopus subject areas

  • General

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Pre-Columbian age for North American Corispermum L. (Chenopodiaceae) confirmed by accelerator radiocarbon dating. / Betancourt, J. L.; Long, A.; Donahue, D. J.; Jull, A.J. Timothy; Zabel, T. H.

In: Nature, Vol. 311, No. 5987, 1984, p. 653-655.

Research output: Contribution to journalArticle

Betancourt, J. L. ; Long, A. ; Donahue, D. J. ; Jull, A.J. Timothy ; Zabel, T. H. / Pre-Columbian age for North American Corispermum L. (Chenopodiaceae) confirmed by accelerator radiocarbon dating. In: Nature. 1984 ; Vol. 311, No. 5987. pp. 653-655.
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