Threat Status and Distribution of the Earthworm Genus Helodrilus Hoffmeister, 1845; Sensu Zicsi 1985, on the Balkans and the Neighboring Regions |
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Authors: | Mirjana Stojanović Spasenija Karaman |
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Institution: | (1) Institute of Biology and Ecology, Faculty of Science, R. Domanovića 12, 34000 Kragujevac, Serbia and Montenegro |
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Abstract: | To assess the conservation status of the Balkans earthworm species from genus Helodrilus and to establish priorities for conservation, we propose an objective and sensitive separate analysis based on the Conservation
Priority Index (CPI). Validity of the threatened species in our ranking system was tested by comparing the results with the
IUCN (2001) Red List Categories and Criteria: version 3.1. IUCN Species Survival Commission. IUCN, Gland Switzerland and Cambridge,
UK. Species were ranked according to their CPI taking into consideration a set of 9 variables (distribution, endemicity, vegetation
zones, persistence, density rarity, rarity of occupancy, locality concentration, habitat specificity and habitat rarity).
Each of variables was categorized into five ranks (0–4) of increasing risk for survival. The overall score (CPI index) for
each species was the sum of all scores for each variable. The index can take values ranging from 0 to 36. We classified threatened
species (CPI≥17) in three IUCN (2001) categories. Vulnerable, Endangered and Critically Endangered. All species that had proved
to be the VU, EN or CR category according to IUCN (2001) also had a CPI value high enough to be included in some of the categories
discussed above (CPI≥17). Our expertise shows that the species which need urgent action are: H. mozsaryorum (CR or EX), H kratochvili (CR), H. deficiens (EN) and H. balcanicus plavensis (EN). H. dinaricus, H. ospensis, H. serbicus, H. jadronensis, H. duhlinskae, H. vagneri, H. slovenicus and H. italicus were known only from the type locality, so we included these species only in suspect CR. |
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Keywords: | CPI index Earthworms Genus Helodrilus The Balkan Peninsula Threat status |
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