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Amphibian DeclinesThe Conservation Status of United States Species$
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Michael Lannoo

Print publication date: 2005

Print ISBN-13: 9780520235922

Published to California Scholarship Online: March 2012

DOI: 10.1525/california/9780520235922.001.0001

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Evaluating Calling Surveys

Evaluating Calling Surveys

(p.314) Forty-Six Evaluating Calling Surveys
Amphibian Declines

Sam Droege

Paige Eagle

University of California Press

In North America, approximately fifty-five of the 103 species of anurans can be surveyed readily by using counts of vocalizing males as an index to their presence or population size. Such surveys are most applicable to eastern and northern parts of the continent, where almost all species regularly vocalize and breeding seasons extend over several weeks. Calling surveys of amphibians are designed to provide an index to changes in amphibian populations. The technique can be applied in monitoring sampling designs to provide estimates of abundance and change at scales ranging from continental down to single wetlands. By correlating observed trends and distribution patterns with ancillary variables, it is also possible to gain insight into the factors affecting population changes over time. For example, population declines may be associated with agricultural regions, while population increases may occur in regions where wetlands have increased.

Keywords:   North America, amphibians, calling surveys, anurans, breeding, monitoring, sampling, population declines

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