Assiminea grayana

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	LITTORINIMORPHA	ASSIMINEIDAE

Scientific Name:

Assiminea grayana

Species Authority:

Fleming, 1828

Common Name/s:

English

–

Dun Sentinel

Assessment Information [top]

Red List Category & Criteria:	Least Concern ver 3.1
Year Published:	2011
Assessor/s:	Killeen, I. & Seddon, M.
Reviewer/s:	Aldridge, D., Moorkens, E., von Proschwitz, T., Richman, N., Cuttelod, A. & Nichols, C.
Contributor/s:
Justification: This species is abundant where present, therefore not likely to become threatened given the current range, hence it is listed as Least Concern (LC). However the estuarine sites are vulnerable to development for port and harbour purposes, for tourism (marina construction) and industrial estates. This would provide local threats to sites.

Geographic Range [top]

Range Description:	This species is known from the coasts of western Europe, where it is mainly found on the countries bordering the North Sea. Fauna Europea (Bank et al. 2006) list the range as Denmark (mainland), Republic of Ireland (Eire), Great Britain (UK), Netherlands, Belgium, France (mainland), and Germany. The records from Italy (mainland) require confirmation, as there are other species of Assiminea that have recently been separated. Kerney (1999) suggests that Assiminea grayana could be an introduction in Ireland, as it is only found around the Shannon Estuary and the first records were in 1991.
Countries:	Native: Belgium; Denmark; France (France (mainland)); Germany; Netherlands; United Kingdom (Great Britain) Present - origin uncertain: Ireland
Range Map:	Click here to open the map viewer and explore range.

Population [top]

Population:	In Great Britain this species is abundant where present, although localised on the East Anglian and South Yorkshire Coasts in suitable habitats (Kerney 1999).
Population Trend:	Stable

Habitat and Ecology [top]

Habitat and Ecology:	This species is usually found in salt marshes or estuaries at or just above high tide level, usually crawling on wet mud, under stones and pieces of drift wood and sometimes on the stones under seaweed/vegetation.
Systems:	Freshwater

Threats [top]

Major Threat(s):	This species is abundant where present and hence not likely to become threatened given the current range, however, the estuarine sites are vulnerable to development for port and harbour purposes, for tourism (marina construction) and industrial estates. This would provide localized threats to sites.

Major Threat(s):

This species is abundant where present and hence not likely to become threatened given the current range, however, the estuarine sites are vulnerable to development for port and harbour purposes, for tourism (marina construction) and industrial estates. This would provide localized threats to sites.

Conservation Actions [top]

Conservation Actions:	There are no known conservation actions for this species, although the presence in some salt-marsh/estuarine areas in the UK, The Netherlands and Belgium may provide protection for the habitats where the species is found. In Ireland, it is probably introduced, and assessed as Not Applicable (Byrne et al. 2009). In Great Britain, although it has a restricted distribution, it is considered to be stable and listed as Least Concern (Seddon and Killeen pers. comm. 2010). In the Netherlands, it is considered Endangered (Bruyne et al. 2003) based on loss of habitats in the last 40 years. Research actions include: further research to establish the taxonomic status of the Italian populations; origin of introduced populations in Ireland; better understanding of the range overlap with the recently described species in the North Atlantic.

Conservation Actions:

There are no known conservation actions for this species, although the presence in some salt-marsh/estuarine areas in the UK, The Netherlands and Belgium may provide protection for the habitats where the species is found. In Ireland, it is probably introduced, and assessed as Not Applicable (Byrne et al. 2009). In Great Britain, although it has a restricted distribution, it is considered to be stable and listed as Least Concern (Seddon and Killeen pers. comm. 2010). In the Netherlands, it is considered Endangered (Bruyne et al. 2003) based on loss of habitats in the last 40 years. Research actions include: further research to establish the taxonomic status of the Italian populations; origin of introduced populations in Ireland; better understanding of the range overlap with the recently described species in the North Atlantic.

Citation:	Killeen, I. & Seddon, M. 2011. Assiminea grayana. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 19 May 2013.
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