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(Article of periodic en Anglais - 1985)

Document title

Speciation and age revision of the Atacaman snail Bostryx variabilis Herm

Authors(s) and Affiliation(s)

CRAIG A. K. ;

Abstract

Field evidence from the Atacama Desert of northern Chile indicates that the stratigraphic position of the land snail Bostryx variabilis Herm has been incorrectly assigned to a marine series of the lower Pleistocene. Isotopic dating proves that the snail is a recently extinct Holocene taxon requiring no special paleoenvironmental explanations for its presence. However, the snail appears to offer an example of stress-induced speciation in confirmation of the "punctuated equilibrium" theory of evolution. It was probably transported from a fog oasis mountain habitat to a lower, hyperarid hostile environment by a sudden mudflow.

Source

Article of periodic

published at : Quaternary research New York

Editor :

Millesime : 1985, vol. 23, no3 [pp. 382-387]

Bibliographic references : 16 réf.

Language

Anglais

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