Abstract
Tree hollows are keystone structures for saproxylic fauna and host numerous endangered species. However, not all tree hollows are equal. Many variables including physical, biotic and chemical ones, can characterise a tree hollow, however, the information that these could provide about the saproxylic diversity they harbour has been poorly explored. We studied the beetle assemblages of 111 Quercus species tree hollows in four protected areas of the Iberian Peninsula. Three physical variables related to tree hollow structure, and two biotic ones (presence of Cetoniidae and Cerambyx species recognised as ecosystem engineers) were measured in each hollow to explore their relative effect on beetle assemblages. Moreover, we analysed the chemical composition of the wood mould in 34 of the hollows, in order to relate beetle diversity with hollow quality. All the environmental variables analysed (physical and biological) showed a significant influence on saproxylic beetle assemblages that varied depending on the species. Furthermore, the presence of ecosystem engineers affected both physical and chemical features. Although wood mould volume, and both biotic variables could act as beetle diversity surrogate, we enhance the presence of Cetoniidae and Cerambyx activity (both easily observable in the field) as indicator variables, even more if both co-occur as each affect to different assemblages. Finally, assimilable carbon and phosphorous contents could act as indicator for past and present beetle activity inside the cavity that could become a useful tool in functional diversity studies. However, an extension of this work to other taxonomic groups would be desirable.
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Acknowledgments
We are very grateful to the staff of the four protected areas for their help during the study. We would also like to thank all our colleagues for their invaluable help with the taxonomy and biology of the studied groups: H Brustel, L Chékir, M Kadej, P Leblanc, JL Lencina, G Liberti, MJ López, T Noblecourt, JC Otero, O Rose, F Soldati, A Verdugo, P Vien, A Viñolas, JL Zapata. Ana Paola Falcó for the statistical Support. Kate Burke helped with the English grammar. Financial support was provided by “Ministerio de Ciencia e Innovación” (CGL2011-23658), “Ministerio de Economia y Competitividad (CGL2012-31669)” and by “Generalitat Valenciana” (PROMETEO/2013/03412 Project).
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Micó, E., García-López, A., Sánchez, A. et al. What can physical, biotic and chemical features of a tree hollow tell us about their associated diversity?. J Insect Conserv 19, 141–153 (2015). https://doi.org/10.1007/s10841-015-9754-9
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DOI: https://doi.org/10.1007/s10841-015-9754-9