Sand-verbena moth (Copablepharon fuscum) COSEWIC assessment and status report: chapter 14
Copablepharon fuscum
Sand Verbena Moth
Noctuelle de l'abronie des dunes
Range of Occurrence in Canada: Georgia Basin region, southwestern British Columbia
Extent and Area Information
Extent of occurrence (EO) (km2) | 3700 km2 in Canada, 4850 km2 globally |
Specify trend in EO | Unknown; likely stable |
Are there extreme fluctuations in EO? | No |
Area of occupancy (AO) (km2) | +/- 5 km2 in Canada <25 km2 globally |
Specify trend in AO | Unknown; likely declining |
Are there extreme fluctuations in AO? | No |
Number of known or inferred current locations | 3 in Canada; 8 globally |
Specify trend in # | Unknown; stable in short-term; declining in long-term? |
Are there extreme fluctuations in number of locations? | No |
Specify trend in area, extent or quality of habitat | Declining |
Population Information
Generation time (average age of parents in the population) |
1 year |
Number of mature individuals | Unknown (range of 350 to 10 500 based on a range of 0.2 to 6.0 moths/m2 of A. latifolia) |
Total population trend | Unknown but likely declining |
% decline over the last/next 10 years or 3 generations | Unknown |
Are there extreme fluctuations in number of mature individuals? | Unknown but likely yes (based on other insects) |
Is the total population severely fragmented? | Yes |
Specify trend in number of populations | Unknown; stable in short-term; declining in long-term |
Are there extreme fluctuations in number of populations? | No |
List populations with number of mature individuals in each: | Near Comox, B.C. Pop 1 Near Comox, B.C. Pop 2 Near Sidney, B.C. Pop 3 Number of mature individuals unknown. |
Threats (actual or imminent threats to populations or habitats)
- reduction in quantity and quality of host-plant resources from stabilization or degradation of open sand habitat. This includes exotic plant species colonization, recreation disturbance, development of roads, buildings, etc., and changes to sand supply or transport. The risk of disease, predation, or other biotic threats to either C. fuscum or A. latifolia is unknown.
- potential threats include pesticide use in or adjacent to population sites and loss of habitat from sea-level increases associated with climate change.
- collecting or other forms of direct human-caused mortality are considered low.
- potential threats include pesticide use in or adjacent to population sites and loss of habitat from sea-level increases associated with climate change.
- collecting or other forms of direct human-caused mortality are considered low.
Rescue Effect (immigration from an outside source): Low
Status of outside population(s)? USA: Unknown; likely declining |
|
Is immigration known or possible? | Possible, but very unlikely |
Would immigrants be adapted to survive in Canada? | Yes |
Is there sufficient habitat for immigrants in Canada? | Unknown |
Is rescue from outside populations likely? | Highly unlikely |
Quantitative Analysis
Not undertaken because of lack of data
Author: N.A. Page, May 2003
Sources of information: status report
Current Status
COSEWIC: No previous COSEWIC designation
Status and Reason for Designation
Status: Endangered |
Alpha-numeric code: B1ab(ii,iii,iv,v) +2ab(ii,iii,iv,v) |
Reason for designation: The global population of this moth is very small and occurs in a very restricted range. The Canadian population, occurring at only three small sites, is even smaller and more restricted. The moth and its host-plant are habitat specialists dependent on coastal dunes, a rare habitat along the West Coast. This habitat has undergone extensive losses due to stabilization of open dunes (including the introduction of invasive plant species), development and recreational use. The host-plant and therefore the moth are facing the threat of continuing declines due to the loss and degradation of coastal dunes. |
Applicability of Criteria
Criterion A (Declining Total Population):
- cannot be applied as there have not been any previous population estimates and so it is not possible to quantify declines.
- cannot be applied as there have not been any previous population estimates and so it is not possible to quantify declines.
Criterion B (Small Distribution, and Decline or Fluctuation):
- the EO is <5000 km2 (B1);
- the AO is << 500 km2 (B2);
- the population is severely fragmented and is known to exist at 3 sites between which there is believed to be no, or very little, genetic exchange (a);
- there is evidence for continuing declines in area and quality of habitat, number of locations and number of mature individuals – all related to loss/degradation of the larval hostplant and its habitat (b)(ii - v);
- the population likely undergoes extreme fluctuations in numbers of mature individuals (c)(iv), but there is no hard evidence for this.
- the EO is <5000 km2 (B1);
- the AO is << 500 km2 (B2);
- the population is severely fragmented and is known to exist at 3 sites between which there is believed to be no, or very little, genetic exchange (a);
- there is evidence for continuing declines in area and quality of habitat, number of locations and number of mature individuals – all related to loss/degradation of the larval hostplant and its habitat (b)(ii - v);
- the population likely undergoes extreme fluctuations in numbers of mature individuals (c)(iv), but there is no hard evidence for this.
Criterion C (Small Total Population Size and Decline):
- the number of mature individuals is <10 000;
- there is no quantitative information enabling a calculation of decline rate;
- a continuing decline in the number of mature individuals is inferred because of continuing habitat degradation (C2);
- population fragmentation exists and no population consists of >1000 mature individuals (a)(i);
- and extreme fluctuations in the number of mature individuals are suspected (b).
- the number of mature individuals is <10 000;
- there is no quantitative information enabling a calculation of decline rate;
- a continuing decline in the number of mature individuals is inferred because of continuing habitat degradation (C2);
- population fragmentation exists and no population consists of >1000 mature individuals (a)(i);
- and extreme fluctuations in the number of mature individuals are suspected (b).
Criterion D (Very Small Population or Restricted Distribution):
- the total number of mature individuals in likely >1 000
- the AO is <20 km2 and the species occurs at <5 locations (D2).
- the total number of mature individuals in likely >1 000
- the AO is <20 km2 and the species occurs at <5 locations (D2).
Criterion E (Quantitative Analysis):
- the available information is insufficient to do a quantitative analysis of the probability of extinction.
- the available information is insufficient to do a quantitative analysis of the probability of extinction.
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