Pachnodus fregatensis

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

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Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
ANIMALIA	MOLLUSCA	GASTROPODA	STYLOMMATOPHORA	CERASTIDAE

Scientific Name:	Pachnodus fregatensis
Species Authority:	Van Mol & Coppois, 1980

Assessment Information [top]

Red List Category & Criteria:	Endangered A1a ver 3.1
Year Published:	2009
Assessor/s:	Gerlach, J.
Reviewer/s:	Miller, R.M., Pollock, C.M. & Seddon, M.
Contributor/s:
Justification: 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.

Geographic Range [top]

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).
Countries:	Native: Seychelles (Seychelles (main island group))
Range Map:	Click here to open the map viewer and explore range.

Population [top]

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.
Population Trend:	Unknown

Habitat and Ecology [top]

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.
Systems:	Terrestrial

Threats [top]

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.

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 [top]

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.

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.

Citation:	Gerlach, J. 2009. Pachnodus fregatensis. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 23 May 2013.
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