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Recovery Strategy for the Western Silvery Minnow (Hypognathus argyritis) in Canada [Proposed]

Appendix A  Threats Assessment Analysis

Knowledge of the threats to a species and potential to mitigate those threats is fundamental to a species’ recovery. In this assessment, the Recovery Team identified the following threats for consideration:

  • Species introductions
    • Predation
    • Competition
    • Food chain disruption
  • Habitat Loss/Degradation
    • Dam installation and operation
    • Changes in flow regulation
    • Canal maintenance
    • Groundwater extraction
    • Surface water extraction : irrigation
    • Surface water extraction : non-irrigation
    • Livestock use of the flood plain
  • Pollution
    • Point Sources
    • Non-point Sources
    • Anoxia
  • Natural Processes
    • Drought
    • Climate change

Because so little is known of the species’ life history and habitat requirements, the assessment of each potential threat was qualitative rather than quantitative, with each factor being rated as “low”, “moderate” or “high”. These assessments were based on the best professional judgement of the Recovery Team, and determined by consensus following discussions. For each potential threat at each location where the species is known to occur, the following factors were considered:

  • Likelihood of Occurrence : The probability of a threat occurring. Those that presently affect the species were rated “high”.
  • Extent of Occurrence : The spatial range of each identified threat. Those that affect most or all of the area occupied by the species were rated “high”.
  • Severity of Impact : The severity of the direct or indirect impact of a threat on the survival or recovery of the species. Impacts with the potential to extirpate the species were rated “high”.
  • Immediacy of Impact : The immediacy of the anticipated impact from a threat was denoted with a “P” for past impacts; “C” for current, ongoing impacts; and an “F” for possible future impacts.
  • Threat Significance : The risk of damage to the western silvery minnow population from a particular threat, based on its likelihood and extent of occurrence and on the severity and immediacy of its impacts. Threat significance was rated “low” where severity of the impact was deemed low, and otherwise was difficult to predict given present knowledge.
  • Mitigation Potential : The biological and technical feasibility of mitigating a threat. Where there are no biological impediments and proven technology exists to successfully mitigate threats, the mitigation feasibility was rated “high”.

 In the tables, questions marks (?) denote uncertainty, and the need for research. Comments provide background on each threat or its assessment.

Appendix B. List of Consultation

Individuals and groups that were consulted during development of the western silvery minnow recovery strategy included:
DateLocationMeeting TypeAttendees/Issues
May 6, 2004 Milk River Local GovernmentRepresentatives from the Town of Milk River, Warner County and the Village of Coutts were present, including Emma Hulitt who later joined the Recovery Team.  Invited parties that did not attend included representatives of the counties of Cardston, Forty Mile and Cypress.  Presentation on Species at Risk Act and western silvery minnow.
March 14, 2007 Milk River PublicAttendees included: Mike Brown, Pam Nielsen, Doreen Nielsen, Ken Brown, Austin Hook, Christy Audet and Don Welsh from Milk River, and Sandy Reimersma from Mossleigh, AB.  Presentation of current draft recovery strategy.  Provided copies of draft recovery strategy for comment.


Appendix C. Record of cooperation and consultations

Aboriginal Organizations and First Nations:
A draft of the proposed recovery strategy was circulated to identified Aboriginal Organizations and First Nations for comment prior to the strategy being posted on the SARA Registry.  Letters, plain language summaries of the recovery strategy and factsheets were sent to the following Aboriginal Organizations and First Nations:
Assembly of First Nations, Blood Tribe, Métis Nation of Alberta, Métis National Council, and Treaty 7 Management Corporation. To date no comments have been received.

Other Jurisdictions:  The Province of Alberta participated jointly with the DFO in the development of the proposed recovery strategy.  Comments were received on a draft version on the strategy.

Concurrent with posting of the proposed recovery strategy on the SARA Public Registry, announcements will be placed in local newspapers inviting public comment.   In addition, information packages will be forwarded to specific stakeholders with an identified interest in the recovery strategy including resource users, non-government organizations and local government inviting their comment.  All comments received will be considered prior to posting of the final recovery strategy.

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