Green-scaled willow (Salix chlorolepis) COSEWIC assessment and status report: chapter 11
Technical Summary
Salix chlorolepis
green-scaled willow – saule à bractées vertes
Range of Occurrence in Canada:
Quebec
Extent and Area Information
Extent of occurrence (EO) (km²) SoftMap Plus software, version 4.5, polygonal area enclosing all sightings : 7.5 km²
Specify trend in EO :
Stable
Are there extreme fluctuations in EO?
No
Area of occupancy (AO) (km²)
SoftMap Plus software, version 4.5, polygonal area around sightings : 0.05 km²
Specify trend in AO :
Stable
Are there extreme fluctuations in AO?
No
Number of known or inferred current locations :
4 populations on 1 mountain top
Specify trend in # :
Stable
Are there extreme fluctuations in number of locations?
No
Specify trend in area, extent or quality of habitat :
Stable; new sites found in the Mount Albert population following more intensive inventory efforts
Population Information
Generation time (average age of parents in the population) :
Unknown but likely several years to flowering
Number of mature individuals :
Approximately 300
Total population trend:
Stable
% decline over the last/next 10 years or 3 generations
Are there extreme fluctuations in number of mature individuals?
No
Is the total population severely fragmented?
No
Specify trend in number of populations:
Stable
Are there extreme fluctuations in number of populations?
No
List populations with number of mature individuals in each:
Mount Albert: approximately 300 individuals
Threats (actual or imminent threats to populations or habitats)
Actual and potential threats:
- Trampling of some individuals as the result of the widening of trails by users of the International Appalachian Trail.
- Limited herbivory by rusty tussock moth larvae
Rescue Effect (immigration from an outside source)
Status of outside population(s)?
No other world population
Is immigration known or possible?
Not applicable
Would immigrants be adapted to survive in Canada?
Not applicable
Is there sufficient habitat in Canada?
Not applicable
Is rescue from outside populations likely?
No
Quantitative Analysis
None
Current Status
Threatened in Quebec since 1995 (Quebec Act Respecting Threatened or Vulnerable Species)
COSEWIC:Threatened (2006)
Status and Reasons for Designation
Status: Threatened
Alpha-numeric Code: D1
Reasons for Designation: An endemic shrub restricted to the serpentine outcrops of Mount Albert in Gaspésie Provincial Park, Quebec. The low numbers of the shrub located on a single mountain top are at risk from stochastic events, potential impact of the exotic tussock moth, and limited impact from hikers along the Appalachian Trail.
Applicability of Criteria
- Criterion A: (Declining Total Population): Not applicable. Inferred declines are not sufficiently large to warrant using this criterion.
- Criterion B: (Small Distribution, and Decline or Fluctuation): Not applicable. Although having a small extent of occurrence and area of occupancy and < 5 populations at a single locality, a continuing decline of any significance cannot readily be inferred.
- Criterion C: (Small Total Population Size and Decline): Not applicable. Population size is well below 2500 individuals but a continuing decline of a significant nature cannot readily be inferred.
- Criterion D: (Very Small Population or Restricted Distribution): Meets Threatened D1 based on a population size of <1000.
- Criterion E: (Quantitative Analysis): None available.
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