IUCN SSC Mid-Atlantic Island Invertebrates Specialist Group

Species

BackBoettgeria crispa (Lowe, 1831)

Boettgeria crispa (Lowe, 1831)

  • Kingdom: Animalia
  • Phylum:
  • Class: Mollusca
  • Order: Gastropoda
  • Family: Clausiliidae
NT Near Treatened
IUCN Red List Status:

Countries of Occurrence:
Portugal - Madeira

Archipelago(s):
Madeira

Assessor/s:
Seddon, M.B.

Reviewer/s:
Groh, K., Cameron, R. & Cuttelod, A.

Contributor/s:

Facilitators / Compilers/s:


Assessment Rationale:

Seddon (2008) suggested the species should be assessed as Near Threatened (Version 3.1). The species has a small area of occupancy (under 300 km²) known in 10–15 valleys. Although the habitat was previously regarded as threatened on the basis of the declining area of Laurisilva, this species is now thought to be stable following conservation programmes aimed at protection of the forest which were established in the 1980s. The impact of the recent storms with loss of large trees in February 2010, followed by the fires in the highlands of Madeira (August 2010) on this species are not known, and field surveys in the region are recommended to assess the status of the Laurisilva forests. As long as the decline in the habitat quality due to the fires is not clearly assessed, this species is maintained, on a precautionary approach, as Near Threatened (NT), almost meeting criterion B.

Geographic Range:

This species is endemic to the Madeiran islands, where it is restricted to Madeira (700–1,000 m elevation). It is more frequently found in the northern areas on the laursilva zone.

Regions:
Portugal - Madeira
Extent of Occurrence (EOO):
(km2)
Area of Occupancy (AOO):
300 (km2)
Elevation Lower Limit:
700 (m)
Elevation Upper Limit:
1000 (m)
Biogeographic Realms:
Palearctic
Presence:
Extant
Origin:
Endemic Madeira
Seasonality:
Resident

Population:

The population is believed to be stable, but it requires specialist survey rather than general surveys to locate the species.

Habitat and Ecology

The species is usually found on the trunks of large trees (Laurisilva), living in crevices of the bark, or on leaf-litter at base of trunks. It is sometimes found on the rock-crags where it lives amongst leaf-litter on ledges.

Major Threat(s):

Major threats come from the loss of large trees due to storm damage or fire.

Conservation Actions

Habitat management in the Laurisilva zone is required to ensure the regeneration of large trees, as well as management of the woodland to retain large trees and other shaded rocky habitats that the species likes.