|Scientific Name:||Vertigo genesii|
|Species Authority:||(Gredler, 1856)|
Vertigo concinna Scott, 1891
Vertigo levenensis Scott, 1891
Vertigo pygmaea Scott, 1891 subspecies concinna Scott, 1891
Vertigo zschokkei Bȕtikofer, 1920
|Red List Category & Criteria:||Least Concern ver 3.1|
|Reviewer(s):||Cuttelod, A. & Neubert, E.|
Given the range of protected sites where this species is present, with appropriate site management, the species should no longer be at risk of extinction. It is therefore considered as Least Concern (LC). However, information from Italy was not available and would have a key influence on the assessment.
This species has also been assessed at the regional level:
European regional assessment: Least Concern (LC)
EU27 regional assessment: Least Concern (LC), as it does not occur in the 27 member States of the European Union
|Range Description:||The species is an Arctic-Alpine relict, and was a pioneer species during the early Post-glacial phase in much of the Europe after the Pleistocene ice sheets had retreated. It is recorded mostly in Scandinavia and in the Alps. It has a scattered and often localised distribution in many countries. Bank et al. (2006) list as "Distribution: Norway, Sweden, Finland, Great Britain (UK), France (Mainland), Switzerland, Italy (Mainland), Latvia". In Pokryszko's overview the species (http://www.staff.amu.edu.pl/~polmal/smp/v97.htm) "A North-European species; mountains of the central part of Scandinavia, less common in southern Sweden; locally in Finland, Germany, Switzerland; an isolated locality in England. In Poland one record from Bialowieza Forest, not confirmed to date". Pokryszko (1990) mentions also its possible presence in Poland. Older records from outside this range are likely to be of V. geyeri.|
Native:Finland; Germany; Italy (Italy (mainland)); Latvia; Norway; Sweden; Switzerland; United Kingdom (Great Britain)
|Range Map:||Click here to open the map viewer and explore range.|
The populations of this species appear to be stable where they have been monitored (Killeen 2010). In 1999/2000 a survey was carried out to determine the status extent of Vertigo genesii at its only known site in England (Killeen 2001). The results showed that V. genesii was widespread in calcareous flushes throughout the site and in places was locally abundant. Life history studies on the snail at this site showed an increase in abundance of V. genesii from August through to but that there was no defined time of year for a major reproductive event. Juveniles were present throughout the year and on average they comprised 55% of the population.
In 2009/2010 a further study was undertaken to monitor the Vertigo genesii population at the site in order to carry out a condition assessment and to determine the attributes that will be assessed by future monitoring, which is a requirement of the EU Habitats and Species Directive. Condition at the site was assessed by a survey of the six main flush areas of the site where V. genesii had been previously. The attributes used to assess Condition were based on area of potential snail habitat, area of occupancy of the snail, the number of overall positive recordings per number of field samples, and the hydrological field assessment. The individual site assessments established that Vertigo genesii was in Favourable Condition at this SAC, there was no overall loss in area of habitat, no change in V. genesii distribution, abundance or population structure over the 10 year period since the previous survey.
Similarly detailed survey results are not available from other countries, but from Article 17 assessments, the same condition can be inferred.
|Habitat and Ecology:||The species occurs in soligenous fens and mires, wet flushes and constantly humid meadows that are calcareous and have a high pH (Pokryszko 1993, Cameron et al. 2003, von Proschwitz 2003). It lives at the base of short sedges, particularly Carex viridula and mosses, especially Palustriella (syn. Cratoneuron) spp and Drepanocladus revolvens (Killeen 2004). It occurs where the substrates are at or near field capacity, in often incompletely vegetated, rather stony or gravelly wet flushes (on sloping ground) not subject to flooding (Cameron et al. 2003). Vertigo genesii occurs mainly at altitudes between 300 and 900 metres, but has been recorded as low as 75 m at the Black Isle site in Scotland, and as high as 2000 m in the Alps.|
|Use and Trade:||This species is not used.|
|Major Threat(s):||Few local extinctions occurred in Europe. The main threats to this species are the modification of site hydrology, heavy grazing, lack of grazing, supplementary feeding of livestock, and climate change.|
|Conservation Actions:||While there now are a range of protected sites where this species is present, these require ongoing appropriate site management, and this should be enough to secure the species within its current range.|
|Citation:||Moorkens, E. 2011. Vertigo genesii. The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 20 December 2014.|
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