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Population dynamics of the solitary digger bee Andrena vaga Panzer (Hymenoptera, Andrenidae) studied using mark-recapture and nest counts

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Population Ecology

Abstract

The population size of the solitary digger bee Andrena vaga was documented using mark-recapture methods during 4 consecutive years (1996–1999). Additionally, the numbers of the parasitoids Nomada lathburiana and Bombylius major were estimated. For calculations of the daily population size, the Jolly-Seber model for open populations with time-dependent survival and capture rates was used. The mean daily population size corresponded well to the number of nests marked in the aggregation of A. vaga. The method of mark-recapture achieved the most accurate data when the number of sampling periods and the capture probability was high. The results document a decrease in population size of the investigated A. vaga aggregation during 4 successive years. A population increase of its parasitoids B. major is considered to be one reason for the population decline of A. vaga in 1999. The sex ratio of A. vaga was biased toward females, contrary to the expected higher number of males. Results of the mark-recapture studies showed that up to 50% of females left the aggregation or died at the beginning of the season. The females probably colonized new aggregations at distances further than 200 m away from their birth aggregation, as no marked females were observed in the environs of the study area. This behavior is interpreted as a parasite avoidance strategy. The bee populations in the study area form a web of interconnected aggregations. Apparently a flux of extinction and recolonization exists between the different aggregations.

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Acknowledgements

I am grateful to Dr. Andreas Kaiser (Institute of Zoology, University of Mayence), who assisted in analyzing the data using the computer programs “Mark” and “Jolly”. I further appreciate the comments and suggestions on this manuscript by Dr. Antje Bischoff, Dr. Irina Brake, Dr. Rainer Hutterer, Volker Mauss, Dr. Bernhard Misof, Dr. Robert Paxton, and Dr. Bradley Sinclair. This study was supported by a PhD grant from the Deutsche Bundesstiftung Umwelt.

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  1. Zoologisches Forschungsinstitut und Museum Alexander Koenig, Adenauerallee 160, 53113, Bonn, Germany

    Inge Bischoff

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  1. Inge Bischoff
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Bischoff, I. Population dynamics of the solitary digger bee Andrena vaga Panzer (Hymenoptera, Andrenidae) studied using mark-recapture and nest counts. Popul Ecol 45, 197–204 (2003). https://doi.org/10.1007/s10144-003-0156-6

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