|Scientific Name:||Pachnodus fregatensis|
|Species Authority:||Van Mol & Coppois, 1980|
|Red List Category & Criteria:||Endangered A1a ver 3.1|
|Reviewer(s):||Miller, R.M., Pollock, C.M. & Seddon, M.B.|
Secondary poisoning with rodent poison (Brodifacoum) in the year 2001 led to a decline in the popualtion of about 87%, relative to the population size in 1999. The causes of this decline have ceased and future population increases are expected.
|Range Description:||This terrestrial snail is endemic to Fregate island, Seychelles. It occupies a single, continuous range of only 2 km² (extent of occurrence (EOO) and area of occupancy (AOO) both calculated at 2 km²).|
Native:Seychelles (Seychelles (main island group))
|Estimated area of occupancy (AOO) - km2:||2|
|Number of Locations:||1|
|Continuing decline in number of locations:||No|
|Extreme fluctuations in the number of locations:||No|
|Lower elevation limit (metres):||1|
|Upper elevation limit (metres):||100|
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||Eradication of rats using Brodifacoum poisoning was associated with an 87% population decline in this species between 1999 and 2001. In 2005, the population was estimated to be 7,700 individuals.|
|Current Population Trend:||Unknown|
|Habitat and Ecology:||This snail, the only surviving terrestrial Pachnodus species, is found under logs in lowland woodland, from 1-100 metres above sea level.|
|Continuing decline in area, extent and/or quality of habitat:||No|
|Generation Length (years):||2|
|Major Threat(s):||Predation by rats was speculated to be a threat in the 1990s. Eradication of rats using Brodifacoum poisoning was associated with an 87% population decline in this species between 1999 and 2001. The successful completion of the rodent eradication means that neither of these threats remain. Currently no active threats are known. Large-scale agro-industry farming and plantations caused some habitat degradation in the past.|
|Conservation Actions:||A captive assurance colony is maintained by the Zoological Society of London, and habitat restoration is in place. Continued monitoring of the population status is necessary.|
Gerlach, J. 2005. The impact of rodent eradication on the larger invertebrates of Fregate island, Seychelles. Phelsuma 13: 20-27.
Gerlach, J. 2006. Terrestrial and Freshwater Mollusca of the Seychelles Islands. Backhuys, Leiden.
Gerlach, J., Matyot, P. and Samways, M.J. 2005. Developing strategies for invertebrate conservation, the case of the Seychelles islands. Phelsuma: 9-12.
IUCN. 2009. IUCN Red List of Threatened Species (ver. 2009.2). Available at: www.iucnredlist.org. (Accessed: 3 November 2009).
|Citation:||Gerlach, J. 2009. Pachnodus fregatensis. The IUCN Red List of Threatened Species 2009: e.T168120A6454444. . Downloaded on 27 November 2015.|