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Reorganization of an arid ecosystem in response to recent climate change.

Abstract：

:Natural ecosystems contain many individuals and species interacting with each other and with their abiotic environment. Such systems can be expected to exhibit complex dynamics in which small perturbations can be amplified to cause large changes. Here, we document the reorganization of an arid ecosystem that has occurred since the late 1970s. The density of woody shrubs increased 3-fold. Several previously common animal species went locally extinct, while other previously rare species increased. While these changes are symptomatic of desertification, they were not caused by livestock grazing or drought, the principal causes of historical desertification. The changes apparently were caused by a shift in regional climate: since 1977 winter precipitation throughout the region was substantially higher than average for this century. These changes illustrate the kinds of large, unexpected responses of complex natural ecosystems that can occur in response to both natural perturbations and human activities.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Brown JH,Valone TJ,Curtin CG

doi

10.1073/pnas.94.18.9729

keywords:

subject

Has Abstract

pub_date

1997-09-02 00:00:00

pages

9729-33

issue

18

eissn

0027-8424

issn

1091-6490

journal_volume

94

pub_type

杂志文章

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