Abstract
Using a mark-release-recapture technique we describe adult sex ratios, recapture rates and other sample characteristics of two saproxylic species: the nationally threatened longhorn beetle Leptura (Rutpela) maculata (Coleoptera: Cerambycidae) and the common L. quadrifasciata in southeastern Finland over two summers. Over 350 individuals of L. maculata and 150 individuals of L. quadrifasciata were captured on floral resource or in flight, and marked each summer. For L. maculata, the sex ratio was male-biased (2:1), whereas for L. quadrifasciata the bias was less clear. For both species, the male-bias may reflect behavioral differences between sexes, rather than true population differences. The proportion of recaptured individuals was low and varied between 7 and 33% depending on the species and year, which allowed us to estimate population parameters only for L. maculata in 2006. A model which assumed constant survival, but time-dependent catchability and entrance probability from a larger superpopulation, fit the data best. The precision of the total population size estimates were reasonable for all the models tested (coefficient of variation = 7–14%). Based on the estimated local adult population size (mean ± 95% confidence interval = 865 ± 131), and the current distribution area of L. maculata, we infer that the species is not in immediate risk of extinction in Finland. Our analysis shows that mark-recapture technique can provide precise estimates of adult population size of saproxylic beetles which have different adult and larval habitats, and thus be useful in assessing extinction risk and monitoring population trends.
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Acknowledgments
We thank Suomen Hyönteistieteellinen Seura, Suomen Biologian Seura Vanamo and Finnish Environment Institute for financial support. Thomas Ranius and Tomas Roslin gave valuable comments on an earlier version of the manuscript.
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Tikkamäki, T., Komonen, A. Estimating population characteristics of two saproxylic beetles: a mark-recapture approach. J Insect Conserv 15, 401–408 (2011). https://doi.org/10.1007/s10841-010-9313-3
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DOI: https://doi.org/10.1007/s10841-010-9313-3