Abstract
Life cycle and microdistribution patterns of Cordulegaster heros, a charismatic species for nature conservation, are poorly known. Life history characteristics and multiscale habitat preferences of the larvae were followed for one year in monthly intervals by systematic samplings in eight headwaters, which resulted in data on 2562 individuals. We hypothesized that meso- and microhabitat complexity play an important role in forming the population structure and microdistribution of the species. Based on the distribution of the consecutive larval instars, duration of later stages and time of molt and emergence, the larval development of C. heros in the Mecsek Mountains lasts for at least three, but with a maximum of four years. All three levels of the multi-habitat structure [habitat (sites), and meso- (riffle/pool sequence) and microhabitats (biotic and different particle-sized abiotic types)] have significant effects on the spatial distribution of the larvae. Densities and population structures vary among the sites, but mesohabitat type and microhabitat diversity (heterogeneity within a pool or riffle) govern the microdistribution. C. heros prefers pools with small or medium microhabitat heterogeneity and higher proportion of small particle-sized substrates, especially in younger stages. Older larvae are less sensitive for these effects.
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Acknowledgements
Authors’ thanks are due to the students (Bernadett Reitzi, Gréta Bognár and Dániel Németh) of University of Pécs for their extensive help during field works. We thank to Thomas G. Horvath (University of Koblenz-Landau) for providing language improvements. Thanks also for the valuable and constructive comments of the associate editor and two anonymous reviewers.
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Boda, R., Bereczki, C., Pernecker, B. et al. Life history and multiscale habitat preferences of the red-listed Balkan Goldenring, Cordulegaster heros Theischinger, 1979 (Insecta, Odonata), in South-Hungarian headwaters: does the species have mesohabitat-mediated microdistribution?. Hydrobiologia 760, 121–132 (2015). https://doi.org/10.1007/s10750-015-2317-y
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DOI: https://doi.org/10.1007/s10750-015-2317-y