The Okanagan Robber Fly (Efferia okanagana) is a large, brown, bristly robber fly approximately 1.2?2 cm in length. Morphological features distinct to the adults (in both sexes) include striking orange-golden occipital bristles, or ?eyebrows,? around the upper rim of the eyes and a tuft of white bristles on the face which are often pale golden at the base. The last three abdominal segments in males are silver white (females do not have this feature).
The Okanagan Robber Fly was assessed as Endangered by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) in 2011 and is currently not listed on Schedule 1 of the federal Species at Risk Act (SARA). In British Columbia, the Okanagan Robber Fly is ranked S2 (Imperiled) by the Conservation Data Centre and is on the provincial Red list. Recovery is considered biologically and technically feasible.
Okanagan Robber Fly is a Canadian endemic and known globally from five populations in the Okanagan and Thompson valleys, British Columbia. These five populations, from north to south, are: (1) Kamloops, (2) Vernon, (3) Okanagan Falls, (4) Vaseux Lake, and (5) Oliver. The species inhabits twelve plant communities dominated by bluebunch wheatgrass (Pseudoroegneria spicata) within in the low-elevation (280?760 m) areas of the Bunchgrass, Ponderosa Pine, and Interior Douglas-fir biogeoclimatic zones. The species? grassland habitat continues to be degraded in quality by cumulative low-impact threats that include: the introduction and spread of invasive plants and insects and the impacts these species have to adult forage and larval burrow sites; changing fire regimes and natural succession into open grassland habitats; pesticide drift and the potential harm to adults and their food supply; unrestricted all-terrain vehicle use; and land conversion.
The recovery (population and distribution) goal is to maintain the abundance of Okanagan Robber Fly populations at all extant sites within the province, including any additional populations that may be identified in the future.
The recovery objectives are:
1. to secure protection for the known extant sites of Okanagan Robber Fly with no loss or degradation of occupied habitat;
2. to confirm the distribution of Okanagan Robber Fly within its range in British Columbia;
3. to assess the extent of threats to each of the known extant sites and reduce their impacts; and
4. to address knowledge gaps (e.g., habitat requirements for each life stage, natural history information, dispersal, etc.).
Okanagan Robber Fly Technical Working Group, Jennifer Heron. 2016. Recovery Plan for the Okanagan Robber Fly (Efferia okanagana) in British Columbia. Province of British Columbia - Ministry of Environment. BC Recovery Strategy (Species at Risk)
Topic: Recovery Planning
Scientific Name: Efferia okanagana
English Name: Okanagan Robber Fly
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