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(Article of periodic en Français - 1980)

Document title

Technique et fiabilité des dénombrements aériens de canards et de foulques hivernant en Camargue

Authors(s) and Affiliation(s)

DERVIEUX A. ; LEBRETON J. D. ; TAMISIER A. ;

Abstract

The changes in abundance of the ducks and coots wintering in the Camargue have been estimated by monthly air counts since 1964. A series of control trials (n = 63) was conducted in 1976 and 1977 to estimate the reliability of the air counts and to calculate the relationship between the numbers estimated from the air by an observer (E) and the actual numbers of individuals counted on color slides (R) of the same bird flocks. The degree of relationship between the two figures is expressed by a correction coefficient (R/E) expressing the accuracy of the measurement, and by a margin of error based upon a statistical model, which indicates the reliability of the measurement...

Source

Article of periodic

published at : Terre et vie. Revue d'écologie appliquée Paris

Editor :

Millesime : 1980, vol. 34, no1 [pp. 69-99]

Bibliographic references : 20 réf.

Language

Français

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