Abstract
Culicoides chiopterus (Meigen), 1830 and Culicoides dewulfi Goetghebuer, 1936 (Diptera: Ceratopogonidae) are considered to develop exclusively in dung, but do not necessarily show an equal distribution and abundance on livestock farms in Northern Europe. Recent modelling studies identified soil parameters to explain these differences. The present study addressed the question whether topsoil conditions underneath cowpats correlate with the number of emerging C. chiopterus and C. dewulfi. We recorded the emergence of biting midges from 24 cowpats over a period of 4 weeks and analysed samples from the topsoil. In agreement with species distribution models based on remote data, our results detected the correlation of soil moisture, organic matter and soil texture with the number of emerging C. chiopterus and C. dewulfi. With increasing soil moisture, the number of emerging adults increased for both species and the amount of organic matter was positively correlated with the number of emerging C. chiopterus. In contrast, soil textures showed conflicting results, i.e. a positive and negative relationship with the same variables. According to our results, soil underneath dung can explain the number of emerging Culicoides species. The knowledge of these effects might improve the interpretation of large-scaled distribution models for dung-breeding biting midges.
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Acknowledgments
We would like to give special thanks to Esther Timmermann for technical assistance during data collection. Furthermore, sincerest thanks are given to the farmer families who supported our study.
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Lühken, R., Kiel, E., Steinke, S. et al. Topsoil conditions correlate with the emergence rates of Culicoides chiopterus and Culicoides dewulfi (Diptera: Ceratopogonidae) from cowpats. Parasitol Res 114, 1113–1117 (2015). https://doi.org/10.1007/s00436-014-4284-z
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DOI: https://doi.org/10.1007/s00436-014-4284-z