Detection probability of nests of Squacco Herons in southern France

Autor:	Heinz Hafner, Michel Gauthier-Clerc, Christophe Barbraud, Damien Cohez, Yves Kayser
Rok vydání:	2004
Předmět:	education.field_of_study Species complex Nest Observer (quantum physics) biology Ecology Double observer Population size Population Squacco heron biology.organism_classification education Ecology Evolution Behavior and Systematics
Zdroj:	Journal of Field Ornithology. 75:172-175
ISSN:	1557-9263 0273-8570
DOI:	10.1648/0273-8570-75.2.172
Popis:	The double observer approach with marked nests was used in southern France for estimating the detection probability of nests of the Squacco Heron (Ardeola ralloides), a cryptic species in its breeding behavior. Results indicate that the detection probability varied from 0.518 to 0.700 between observers. The overall detection probability, i.e., the probability that a nest was detected by at least one observer, was 0.856. Given a total of 66 nests found by both observers during the surveys, the breeding population was estimated at 77 nests. Since previous estimates of the Squacco Heron breeding population size did not take into account detection probability, we suggest that the breeding population is larger than previously thought in the Camargue and in other European breeding localities.
Databáze:	OpenAIRE
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