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Hystricella Turricula, Cima Discula

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Hystricella Turricula, Cima Discula The IUCN Red List of Threatened Species™ ISSN 2307-8235 (online) IUCN 2008: T6723A12800477 Hystricella turricula, Cima Discula Assessment by: Seddon, M.B. View on www.iucnredlist.org Citation: Seddon, M.B. 2013. Hystricella turricula. The IUCN Red List of Threatened Species 2013: e.T6723A12800477. http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T6723A12800477.en Copyright: © 2015 International Union for Conservation of Nature and Natural Resources Reproduction of this publication for educational or other non-commercial purposes is authorized without prior written permission from the copyright holder provided the source is fully acknowledged. Reproduction of this publication for resale, reposting or other commercial purposes is prohibited without prior written permission from the copyright holder. For further details see Terms of Use. The IUCN Red List of Threatened Species™ is produced and managed by the IUCN Global Species Programme, the IUCN Species Survival Commission (SSC) and The IUCN Red List Partnership. The IUCN Red List Partners are: BirdLife International; Botanic Gardens Conservation International; Conservation International; Microsoft; NatureServe; Royal Botanic Gardens, Kew; Sapienza University of Rome; Texas A&M University; Wildscreen; and Zoological Society of London. If you see any errors or have any questions or suggestions on what is shown in this document, please provide us with feedback so that we can correct or extend the information provided. THE IUCN RED LIST OF THREATENED SPECIES™ Taxonomy Kingdom Phylum Class Order Family Animalia Mollusca Gastropoda Stylommatophora Hygromiidae Taxon Name: Hystricella turricula Lowe, 1831 Synonym(s): • Discula turricula Common Name(s): • English: Cima Discula Assessment Information Red List Category & Criteria: Vulnerable D2 ver 2.3 Year Published: 2013 Date Assessed: August 31, 2010 Justification: Seddon (2008) suggested a revised assessment of Critically Endangered B1ab(iii) (version 3.1) given the survey work by Cook and Cameron (1999-2001; Cameron, pers. comm, 2010) confirming the small extent of occurrence (under 10 km2) and declining quality of habitat. However the offshore islet where it is present is now protected, and hence the quality of habitat is probably not declining over the whole range of the species and a lower risk of extinction is now thought more appropriate, hence it is confirmed as listed as Vulnerable D2; no change from previous Red List assessments. Previously Published Red List Assessments 1996 – Vulnerable (VU) 1994 – Vulnerable (V) 1990 – Vulnerable (V) 1988 – Vulnerable (V) 1986 – Vulnerable (V) 1983 – Vulnerable (V) Geographic Range Range Description: This species is endemic to the Madeiran islands: it is restricted to the islet of Ilheu de Cima, south-east of the main island of Porto Santo (Seddon 2008). Country Occurrence: © The IUCN Red List of Threatened Species: Hystricella turricula – published in 2013. 1 http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T6723A12800477.en Native: Portugal (Madeira) © The IUCN Red List of Threatened Species: Hystricella turricula – published in 2013. 2 http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T6723A12800477.en Distribution Map © The IUCN Red List of Threatened Species: Hystricella turricula – published in 2013. 3 http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T6723A12800477.en Population This species is only present on an offshore islet and there are no recent data on population trends. Current Population Trend: Unknown Habitat and Ecology (see Appendix for additional information) This species is found beneath large blocks of basalt scattered on the grassy slopes (Seddon 2008). Systems: Terrestrial Use and Trade The species is not known to be utilised, although occasionally sold by shell collectors. Threats (see Appendix for additional information) Although the vegetation on the island has been subjected to grazing, at present the levels of threat to the species are uncertain. Any activity that disturbs the vegetation around the basalt blocks where the species is found could lead to disturbance of the species. Conservation Actions (see Appendix for additional information) This species is listed on the EU Habitats and Species Directive Annex II and the Council of Europe Bern Convention Appendix 2. At present the range lies in a protected area. Further research on habitat status and monitoring would be recommended for this species which is found in a protected area. Credits Assessor(s): Seddon, M.B. Reviewer(s): Groh, K., Cameron, R., Cuttelod, A. & Neubert, E. Contributor(s): Cameron, R. © The IUCN Red List of Threatened Species: Hystricella turricula – published in 2013. 4 http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T6723A12800477.en Bibliography Cameron, R.A.D.C., Cook, L.M., Goodfriend, G.M. and Seddon, M.B. 2006. Fossil Landsnail faunas from Porto Santo, Madeiran Archipelago; change and stasis in Pleistocene to recent times. Malacologia 49(1): 25-59. Groombridge, B. (ed.) 1994. 1994 IUCN Red List of Threatened Animals. IUCN, Gland, Switzerland. IUCN. 1990. IUCN Red List of Threatened Animals. IUCN, Gland, Switzerland and Cambridge, UK. IUCN. 2011. IUCN Red List of Threatened Species (ver. 2011.1). Available at: http://www.iucnredlist.org. (Accessed: 16 June 2011). Seddon, M.B. 2008. An illustrated compendium ofthe landsnails and slugs of the Madeiran archipelago. Studies in Biodiversity and Systematics of Terrestrial Organisms from the National Museum of Wales. Biotir Reports. Wells, S.M., Pyle, R.M. and Collins, N.M. (compilers) 1983. The IUCN Invertebrate Red Data Book. IUCN, Gland, Switzerland and Cambridge, UK. Citation Seddon, M.B. 2013. Hystricella turricula. The IUCN Red List of Threatened Species 2013: e.T6723A12800477. http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T6723A12800477.en Disclaimer To make use of this information, please check the Terms of Use. External Resources For Images and External Links to Additional Information, please see the Red List website. © The IUCN Red List of Threatened Species: Hystricella turricula – published in 2013. 5 http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T6723A12800477.en Appendix Habitats (http://www.iucnredlist.org/technical-documents/classification-schemes) Major Season Suitability Habitat Importance? 4. Grassland -> 4.4. Grassland - Temperate - Suitable Yes Threats (http://www.iucnredlist.org/technical-documents/classification-schemes) Threat Timing Scope Severity Impact Score 2. Agriculture & aquaculture -> 2.3. Livestock farming Ongoing Unknown Unknown Unknown & ranching -> 2.3.4. Scale Unknown/Unrecorded Stresses: 1. Ecosystem stresses -> 1.1. Ecosystem conversion 1. Ecosystem stresses -> 1.2. Ecosystem degradation 2. Species Stresses -> 2.2. Species disturbance 7. Natural system modifications -> 7.1. Fire & fire Unknown Unknown Rapid declines Unknown suppression -> 7.1.1. Increase in fire frequency/intensity Stresses: 1. Ecosystem stresses -> 1.1. Ecosystem conversion 1. Ecosystem stresses -> 1.2. Ecosystem degradation 2. Species Stresses -> 2.2. Species disturbance Conservation Actions in Place (http://www.iucnredlist.org/technical-documents/classification-schemes) Conservation Actions in Place In-Place Land/Water Protection and Management Occur in at least one PA: Yes Research Needed (http://www.iucnredlist.org/technical-documents/classification-schemes) Research Needed 3. Monitoring -> 3.4. Habitat trends Additional Data Fields Distribution Estimated area of occupancy (AOO) (km²): 8 © The IUCN Red List of Threatened Species: Hystricella turricula – published in 2013. 6 http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T6723A12800477.en Distribution Estimated extent of occurrence (EOO) (km²): 9 Number of Locations: 1 Habitats and Ecology Continuing decline in area, extent and/or quality of habitat: No © The IUCN Red List of Threatened Species: Hystricella turricula – published in 2013. 7 http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T6723A12800477.en The IUCN Red List of Threatened Species™ ISSN 2307-8235 (online) IUCN 2008: T6723A12800477 The IUCN Red List Partnership The IUCN Red List of Threatened Species™ is produced and managed by the IUCN Global Species Programme, the IUCN Species Survival Commission (SSC) and The IUCN Red List Partnership. The IUCN Red List Partners are: BirdLife International; Botanic Gardens Conservation International; Conservation International; Microsoft; NatureServe; Royal Botanic Gardens, Kew; Sapienza University of Rome; Texas A&M University; Wildscreen; and Zoological Society of London. THE IUCN RED LIST OF THREATENED SPECIES™ © The IUCN Red List of Threatened Species: Hystricella turricula – published in 2013. 8 http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T6723A12800477.en.
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