Scientific Name: Limenitis weidemeyerii
Taxonomy Group: Arthropods
Last COSEWIC Assessment: May 2012
Last COSEWIC Designation: Special Concern
SARA Status: Schedule 1, Special Concern
Image of Weidemeyer's Admiral
Weidemeyer's Admiral is a relatively large, boldly patterned black and white butterfly. It has more white on its hind wing underside and reduced orange markings than the closely related Lorquin’s and White Admirals. As with related species, the larvae resemble bird droppings. The species represents a southern biogeographical element at the northern limit of its range along the Milk River, and is an important model for the study of speciation and mimicry. (Updated 2017/05/24)
Distribution and Population
Weidemeyer’s Admiral is found in western North America from southern Alberta to northern Mexico. In Canada, it is known from seven sites in the Milk River and Lost River area along the Alberta-Montana border. Targeted searches for this species have been conducted in 2004 and 2011 but large areas of potentially suitable habitat have not been surveyed and additional occurrences may yet be found. (Updated 2017/05/24)
In Canada, Weidemeyer’s Admiral is found along valley bottoms, ravines, and coulees along the Milk and Lost rivers where the larval host plant, Saskatoon, is found. Cottonwood and other deciduous trees and shrubs provide shelter and perch sites for adults, and structural support for their major nectar source, Western Clematis which is a vine. Weidemeyer’s Admiral will also use small patches of Chokecherry and Saskatoon in ravines and coulees some distance from the nearest treed riparian habitats. (Updated 2017/05/24)
All Canadian populations appear to have one generation per year. Saskatoon is the only confirmed larval host plant in Canada, although Chokecherry, willows and other shrubs might be used. Late instar larvae overwinter in a rolled-up leaf and emerge in the spring to continue feeding. In Canada, the adult flight period is from early June through late July. (Updated 2017/05/24)
Invasive species, particularly Russian Olive and Saltcedar, may soon change the ecology of woody riparian communities to the detriment of Weidemeyer’s Admiral. Overgrazing by livestock could be a potential threat by reducing habitat quality and incidental ingestion or trampling of larvae. (Updated 2017/05/24)
Federal ProtectionMore information about SARA, including how it protects individual species, is available in the Species at Risk Act: A Guide.
In Canada the Weidemeyer's Admiral has a very restricted range, but portions of it are protected in a provincial park, an ecological reserve and a natural area. (Updated 2005/01/07)
Provincial and Territorial Protection
Recovery Progress and Activities
Summary of Progress to Date Conservation strategies for individual ranches have been developed and implemented on some private ranches which contain habitat of the Weidemeyer’s Admiral. Summary of Recovery Activities Meetings are being held to inform the public about species at risk, such as the Weidemeyer’s Admiral. Workshops are being held with land owners to discuss management practices that would be beneficial for this butterfly.
PLEASE NOTE: Not all COSEWIC reports are currently available on the SARA Public Registry. Most of the reports not yet available are status reports for species assessed by COSEWIC prior to May 2002. Other COSEWIC reports not yet available may include those species assessed as Extinct, Data Deficient or Not at Risk. In the meantime, they are available on request from the COSEWIC Secretariat.
6 record(s) found.
- COSEWIC Status Reports (1 record(s) found.)
- Response Statements (1 record(s) found.)
- Management Plans (1 record(s) found.)
- COSEWIC Annual Reports (1 record(s) found.)
- Consultation Documents (1 record(s) found.)
- Recovery Document Posting Plans (1 record(s) found.)
COSEWIC Status Reports
COSEWIC Annual Reports
Recovery Document Posting Plans
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