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Comparison of enumeration and Jolly-Seber estimation of population size in the common voleMicrotus arvalis |
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| Authors: | Josef Bryja Emil Tkadlec Jiřina Nesvadbová Jiří Gaisler Jan Zejda |
| Institution: | 1. Department of Population Biology, Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic, Květná 8, 603 65, Brno, Czech Republic 2. Department of Population Biology, Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic, 675 02, Studenec 122, Czech Republic 3. Department of Ecology, Palacky University, t?. Svobody 26, 771 46, Olomouc, Czech Republic 4. Department of Zoology and Ecology, Faculty of Science, Masaryk University, Kotlá?ská 2, 611 37, Brno, Czech Republic 5. State Phytosanitary Administration, Hroznová 2, 656 06, Brno, Czech Republic |
| Abstract: | Capture-recapture data on common volesMicrotus arvalis (Pallas, 1779) in central Europe have been almost exclusively analysed by means of the enumeration technique (minimum number alive or calendar of catches). Here we compare enumeration and Jolly-Seber (JS) estimation of population size in the common vole using live-trapping data from an alfalfa field-population in southern Moravia, Czech Republic. Over the entire study the enumeration estimate of the population size was smaller by an average of 28% than the JS estimate. The negative bias increased with density, decreased with both capture probability and the survival rate, and was more pronounced in males at high density. We conclude that the method of direct enumeration is not reliable for estimating population size in the common vole. |
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