Difficulty of Getting Accurate and Precise Estimates of Population Size: The Case of the Siberian Flying Squirrel in Finland

Accurate estimates of population size and distribution are a prerequisite for effective management of populations, but for most species a reliable estimation of the absolute population size is very difficult. In 1998, the Finnish Ministry of Environment set up a working group to plan a national-leve...

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Bibliographic Details
Published in:Annales zoologici fennici 2008, Vol.45 (6), p.521-526
Main Authors: Sulkava, Risto, Mäkelä, Antero, Kotiaho, Janne S, Mönkkönen, Mikko
Format: Article
Language:English
Subjects:
Aerial locomotion
Estimate reliability
Estimation bias
Estimation methods
Female animals
Population estimates
Population size
Population trends
Pteromys volans
Squirrels
Survey methods
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Summary:Accurate estimates of population size and distribution are a prerequisite for effective management of populations, but for most species a reliable estimation of the absolute population size is very difficult. In 1998, the Finnish Ministry of Environment set up a working group to plan a national-level survey for estimation and monitoring of the population size of Siberian flying squirrel (Pteromys volans). In 2006, the population size was reported to be 143 000 females. However, evaluation of the magnitude of possible biases was not attempted. Our aim was to test the population size estimate by conducting a resampling study with the methods of the national survey on an eartagged population of flying squirrels. We found that the methods used in the national survey provide greatly upward biased estimates. Moreover, the magnitude of the bias in the method seems to be sensitive to the true population sizes rendering the method unsuitable for population trend monitoring purposes. Therefore, we caution against using the national survey method in monitoring or in making conclusions about the population size of the Siberian flying squirrel.
ISSN:0003-455X
1797-2450
DOI:10.5735/086.045.0607