Abstract
The establishment of a network of reserves is of fundamental importance to the loss of biodiversity. Seven different area selection methods for the establishment of a reserve network were applied in the present study: (a) 5% cut-off value of the grid cells with the highest species richness or conservation value, (b) complementarity analysis using as criteria species richness or conservation value or rarest species richness, and (c) mixed complementarity analysis using as criteria species richness or conservation value. These methods were applied in the orchid taxa of east Macedonia. The conservation values of taxa were estimated on the basis of regional rarity, broad-scale rarity, and species specialization. The spatial overlap between the resulting networks and the Natura 2000 network of the study area was assessed. Furthermore, the efficiency of the latter network to protect the orchid taxa of the study area was examined. Our results suggest that: (a) a multiscale estimation of rarity is necessary for the unbiased estimation of species conservation values; (b) species specialization adds valuable ecological information to the assessment of taxa conservation values; (c) complementarity and mixed complementarity analyses on species richness or conservation value safeguard all the taxa of the region; (d) complementarity analysis on the basis of the richness of the rarest species safeguards all the rarest taxa, but not the total number of the remaining taxa; (e) the 5% cut-off value on species richness or conservation value fails to protect all the taxa of the region, including a large number of the rarest taxa; and (f) the Natura 2000 network, despite its large coverage in the study area, fails to safeguard all the taxa, including some of the rarest.
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Acknowledgments
The authors would like to thank Mr. Pastircak M. and Mr. Niklfeld H. for providing information about the distribution of Slovakian and Austrian orchids, respectively, and an anonymous reviewer for his valuable comments and suggestions.
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Tsiftsis, S., Tsiripidis, I. & Karagiannakidou, V. Identifying areas of high importance for orchid conservation in east Macedonia (NE Greece). Biodivers Conserv 18, 1765–1780 (2009). https://doi.org/10.1007/s10531-008-9557-3
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DOI: https://doi.org/10.1007/s10531-008-9557-3