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Recovery Strategy for the Hill's Thistle (Cirsium hillii) in Canada
- Recommendation And Approval Statement
- Strategic Environmental Assessment Statement
- Recovery Feasibility Summary
- Executive Summary
- 1. Background
- 2. Recovery
- 3. References
- 4. Recovery Team Members
- Appendix A: Effects on the Environment and Other Species
- Appendix B: List of Hill's Thistle Sites
- Appendix C: Sites Where Hill's Thistle is Considered Extirpated
- Appendix D: Maps of Critical Habitat
Appendix C: Sites Where Hill's Thistle is Considered Extirpated
Jones (2006) revisited several sites on Manitoulin Island that had historic records for Hill's Thistle that had not been reconfirmed for 10-30 years. She found five sites no longer supported the species. In Michigan, Voss (1996) noted that although there were a number of old records from the southern part of the state, Hill's Thistle might now be extirpated in that area.
COSEWIC (2004) lists six historically known populations, which were considered probably extirpated and several that were considered erroneous. However, some of these populations were investigated and recently relocated (Jalava 2005, 2007, 2008b, pers. comm.). Based on the most recent survey work, sites where Hill's Thistle is in fact no longer present, or has not been found in more than 20 years, are listed below.
|Site Name||Last Observer*||Recent Search||Comments|
|Ringius & Wilson, 1976;||Not found by Jones, 2006||Habitat is overgrown with small cedars|
|Bear's Rump Island||Morton and Venn, 1987||Not found by Jalava, 2007 or Schaefer, 1996|
|Cape Croker/Nawash FN||Varga 1995 referring to a 'pre-1949 record'||Not found by Jalava & Chegano, 2008||Extirpated or erroneous record|
|Clapperton Island: Beattie Bay||Morton and Venn, 1976||Not found by Jones, 2005, 2006||Habitat present; species not found|
|Clapperton Island: Logan Bay||Morton and Venn, 1976||Not found by Jones 2005, 2006||Habitat present; species not found|
|Driftwood Cove Alvar||Schaefer, 1996||Not found by Jalava, 2007||Extirpated or erroneous record|
|Foxy Prairie: Gore Bay Airport||J.K. Morton, 2005||Not found by Jones 2005, 2006||Habitat very degraded|
|Roberts Bay||Morton and Venn, 1981||Not found by Jones, 2006||Habitat destroyed by new roads|
|Sauble Beach South||J. Johnson, 1980s||General area visited by Jalava, 2008b||Area is subdivided with cottages; no habitat found|
|Vidal Bay: Creasor Bight||Ringius and Wilson, 1976||Not found by Jones 1997, 2005||Very little habitat present; mostly overgrown|
|Walpole Island F.N.: Squirrel Island||Dodge, 1914||Not found by Gaiser, 1966; or Woodliffe and Allen, 1988|
|Wasaga Beach: Nottawasaga Bay Shore||A.A. Reznicek 1970s||Believed extirpated by recreational development (COSEWIC, 2004)|
* Information from Morton and Venn, 2000; COSEWIC, 2004; Jalava, 2008a,b; and Joan Venn, pers. comm.
- Date Modified: