Variability of Secchi disk readings in an exceptionally clear and deep caldera lake

Archiv fur Hydrobiologie
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SUMMARY: The Peromyscus leucopus on a 17-acre study area were live-trapped, marked, and released over a seven-day period. On the three following nights intensive snap-trapping was done on the central acre of the study plot. The animals caught by snap traps in the central acre represented the population of the central acre and several surrounding acres. By the currently accepted methods of interpreting snap-trap data, the population per acre would be considered to be 23 adults. The live-trap data show that the true population was between six and seven adults per acre. Modern methods of live-trapping are shown to be valid for population studies. Two methods are presented for the conversion of live-trap data into per acre figures. Errors involved in the current use of snap-trap data are discussed and snap-trap methods are shown to be invalid for determining actual population numbers. It should be practical to use a snap-trap quadrant technique to obtain a relative measure or index figure for small mammal populations.
Publication type Article
Publication Subtype Journal Article
Title Variability of Secchi disk readings in an exceptionally clear and deep caldera lake
Series title Archiv fur Hydrobiologie
Volume 141
Issue 4
Year Published 1998
Language English
Contributing office(s) Forest and Rangeland Ecosystem Science Center
Description p. 377-388
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Archiv fur Hydrobiologie
First page 377
Last page 388
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