BC Conservation Data Centre: Conservation Status Report
Valvata tricarinata
Threeridge Valvata
| Scientific Name: | Valvata tricarinata |
|---|---|
| English Name: | Threeridge Valvata |
| Provincial Status Summary | |
| Status: | S1S2 |
| Date Status Assigned: | April 30, 2015 |
| Date Last Reviewed: | April 20, 2015 |
| Reasons: | There are only 3 locations where this species has been found extant since 1969 (Wasa Lake, Kootenay Lake (at Kuskonook) and Columbia River, near Trail). |
| Range | |
| Range Extent: | EF = 5,000-200,000 square km |
| Range Extent Comments: | Until 2014, only 2 records were known (both in Canadian Museum of Nature (CMN) from Kootenay Lake and a pond near the shore of Kootenay Lake in 1969) in collection databases (Lepitzki 2013). In 2014, it was found at Wasa Lake and the Columbia R. near Trail (Lepitzki and Lepitzki 2014) and Kootenay Lake (at Kuskonook) (Klinkenberg 2013; I. Gardiner, pers. comm. 2015). Clarke's (1981) range map includes only a sliver of BC along the border with Alberta beginning north of Jasper. This area does not include Kootenay Lake. Lee (2000) cites Frest (1997) as suggested it is probably a rare species in southern BC. She also cites Frest and Johannes (1995) as stating V. tricarinata is quite rare and all western North American occurences are strongly disjunct but that statement is not in the article - perhaps it is in Frest (1997). |
| Area of Occupancy (km2): | BC = 2-5 |
| Occurrences & Population | |
| Number of Occurrences: | AC = 1 - 80 |
| Comments: | 2 historical records from Kootenay Lake; in 2014, this species was found at Wasa Lake and the Columbia River near Trail (Lepitzki and Lepitzki 2014) and Kootenay Lake (at Kuskonook) (Klinkenberg 2013; I. Gardiner, pers. comm. 2015) (http://linnet.geog.ubc.ca/efauna/Atlas/Atlas.aspx?sciname=Valvata%20tricarinata). |
| Number of Occurrences with Good Viability / Ecological Integrity: | Rank Factor not assessed |
| Number of Occurrences Appropriately Protected & Managed: | Rank Factor not assessed |
| Population Size: | Rank Factor not assessed |
| Threats (to population, occurrences, or area affected) | |
| Degree of Threat: | Rank Factor not assessed |
| Trend (in population, range, area occupied, and/or condition of occurrences) | |
| Short-Term Trend: | Rank Factor not assessed |
| Long-Term Trend: | Rank Factor not assessed |
| Other Factors | |
| Intrinsic Vulnerability: | Rank Factor not assessed |
| Environmental Specificity: | Rank Factor not assessed |
| Other Rank Considerations: | |
| Information Gaps | |
| Research Needs: | |
| Inventory Needs: | |
| Stewardship | |
| Protection: | |
| Management: | |
| Version | |
| Author: | Lepitzki, Dwayne A.W. and Lea Gelling |
| Date: | March 28, 2014 |
| References | |
|
Clarke, A.H. 1981a. The freshwater mollusks of Canada. National Museum of Natural Sciences, National Museums of Canada, D. W. Friesen and Sons, Ltd.: Ottawa, Canada. 446 pp.
|
|
|
Frest, T. J. and E. J. Johannes. 1995. Interior Columbia Basin mollusk species of special concern. Final report to the Interior Columbia Basin Ecosystem Management Project. Walla Walla, WA, USA
|
|
|
Gardiner, Ian. Personal communication.
|
|
|
Klinkenberg, Brian (Editor). 2013. E-Fauna BC: Electronic Atlas of the Fauna of British Columbia
|
|
|
Lee, J. S. and J.D. Ackerman. 1998a. British Columbia freshwater molluscs held at the Canadian Museum of Nature listed by species. Report prepared for the Conservation Data Centre, Ministry of Environment, Victoria, BC, Canada. 95 pp.
|
|
|
Lee, J.S. 2000b. Freshwater molluscs. B.C. Minist. Environ., Lands and Parks, Wildl. Branch. 6 pp.
|
|
|
Lepitzki, D. 2014. General Status rank assessment of freshwater molluscs of British Columbia. Prepared for Canadian Wildlife Service, Environment Canada. Gatineau, PQ.
|
|
|
Lepitzki, D.A.W., and B.M. Lepitzki. 2014. Freshwater and terrestrial mollusc searches in British Columbia Provincial Parks from Banff, Alberta to Trail, British Columbia and return, 6-11 October 2014. Unpublished report submitted to BC Ministry of Environment, Vancouver, BC. 10 pp.
|
|
Please visit the website Conservation Status Ranks for information on how the CDC determines conservation status ranks. For global conservation status reports and ranks, please visit the NatureServe website http://www.natureserve.org/.
Suggested Citation:
B.C. Conservation Data Centre. 2014. Conservation Status Report: Valvata tricarinata. B.C. Minist. of Environment. Available: https://a100.gov.bc.ca/pub/eswp/ (accessed Apr 19, 2024).