- Executive Summary
- Recovery Feasibility
- 1. COSEWIC Species Assessement Information
- 2. Species Status Information
- 3. Species Information
- 4. Threats
- 5. Population and Distribution Objectives
- 6. Broad Strategies and General Approaches to Meet Objectives
- 7. Critical Habitat
- 8. Measuring Progress
- 9. Statement on Action Plans
- 10. References
- 11. Recovery Team Members
- Appendix A. Maps of Western Spiderwort Critical Habitat
- Appendix B. Quarter sections in Canada Containing Critical Habitat for Western Spiderwort
- Appendix C. Effects on the Environment and Other Species
- Appendix D. Beneficial Rangeland Management Practices
Recovery Strategy for the Western Spiderwort (Tradescantia occidentalis) in Canada – 2013
Alberta has formed a provincial recovery team and created a maintenance and recovery plan for 2005-2010 (Alberta Western Spiderwort Recovery Team 2004). Recent recovery actions in the Pakowki Lake Sand Hills have focused on survey and monitoring, invasive species control, as well as education and awareness (Fish and Wildlife Division 2010). In Saskatchewan, surveys are being conducted by numerous agencies in the Elbow Sand Hills, both on Agriculture and Agri-Food Canada – Agri-Environment Services Branch (AAFC-AESB) land and within Douglas Provincial Park; these surveys are mainly to locate new occurrences and delineate the area of occupancy of occurrences. AAFC-AESB has started to develop management guidelines and decision support tools for pasture land managers (E. Svendsen, pers. comm.). Leafy Spurge monitoring and control has been ongoing since 1991 using an integrated pest management approach, including sheep grazing. Saskatchewan Ministry of Parks, Culture and Sport is starting a multi-year adaptive and integrated management program for western spiderwort habitat using prescribed burning, integrated pest management for invasive exotic species such as Leafy Spurge, and grazing (R. Wright, pers. comm.). In Manitoba, there have been efforts to delimit the area of occupancy of all occurrences, and the recent initiation of a monitoring program to monitor responses to different management techniques in an effort to reduce spurge and woody vegetation encroachment (Hamel and Foster 2005, Foster and Reimer 2007, Foster 2008, Krause-Danielson and Friesen 2009, J. Greenall, pers. comm., P. Westhorpe, pers. comm.).
Research and management approaches recommended to address threats as well as key information needs for successful recovery planning are outlined in Table 3.
|Threat or Limitation||Priority||General Description of Research and Management Approaches|
|Broad Strategy: Inventory and Monitoring|
|Knowledge gaps related to trends in population, distribution and habitat; all threats||High|
|Broad Strategy: Adaptive Habitat Management|
|All threats except Prolonged Wet Climatic Periods||High|
|Broad Strategy: Habitat Conservation and Stewardship|
|All threats except Prolonged Wet Climatic Periods||Medium|
|Broad Strategy: Research|
|All threats; Knowledge gaps related to impact of threats and plant ecology||Medium-High|
Research activities needed to further the recovery of the species are explained below.
Addressing several knowledge gaps through research into impacts of human-related threats, habitat needs, and species’ ecology is relevant to the recovery and long-term conservation and management of Western Spiderwort. Research is needed to evaluate the magnitude and direction of threats and mitigation effects on plant fitness, population size, and area of occupancy. In particular ex-situ or in-situ experimental and observational field investigations that could be undertaken, include examining the effects, timing and intensity of grazing, fire, invasive species control, brush control, and idled habitats, or a combination thereof, on Western Spiderwort survival and reproductive output and its habitat quality and availability. Other knowledge gaps requiring research include: aspects of the species’ life cycle; the influence of precipitation on dormancy, population health, and population fluctuations; its tolerance for varying conditions (climate, vegetation encroachment, dune stabilization, precipitation); pollination and pollinator limitations. The research findings need to be applied to beneficial management practices developed for the species and may be used to re-evaluate critical habitat.
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