COSEWIC Status Appraisal Summary on the Long's Braya Braya longii in Canada
COSEWIC status appraisal summaries are working documents used in assigning the status of wildlife species suspected of being at risk in Canada. This document may be cited as follows:
COSEWIC. 2011. COSEWIC status appraisal summary on the Long’s Braya Braya longii in Canada. Committee on the Status of Endangered Wildlife in Canada. Ottawa. xii pp.
(Species at Risk Status Reports)
For additional copies contact:
c/o Canadian Wildlife Service
Également disponible en français sous le titre Sommaire du statut de l’espèce du COSEPAC sur le braya de Long (Braya longii) au Canada.
© Her Majesty the Queen in Right of Canada, 2011.
Catalogue No.: CW69-14/2-16-2011E-PDF
Status Appraisal Summary
Jurisdictions: Government of Newfoundland and Labrador; Environment Canada
Current COSEWIC Assessment:
Recommendation: Update to the status report NOT required (wildlife species’ status category remains unchanged)
Evidence (indicate as applicable):
Sources of Information
Capinera, J.L. 2011. University of Florida Institute of Food and Agricultural Sciences, Department of Entomology and Nematology: Featured Creatures - Diamondback Moth - Plutella xylostella (Linnaeus). Web site: http://entnemdept.ifas.ufl.edu/creatures/veg/leaf/diamondback_moth.htm [Accessed May, 2011]
Hermanutz, L., H. Mann, M.F.E. Anions, D. Ballam, T. Bell, J. Brazil, N. Djan-Chékar, G. Gibbons, J. Maunder, S.J. Meades, W. Nicholls, N. Smith and G. Yetman. 2002. National Recovery Plan for Long’s braya (Braya longii Fernald) and Fernald’s braya (Braya fernaldii Abbe). National Recovery Plan No. 23. Recovery of Nationally Endangered Wildlife (RENEW) Ottawa, Ontario, Canada.
Hermanutz L., S. Squires and D. Pelley. 2009. Limestone Barrens Research Report. Report to the Wildlife Division, Government of Newfoundland and Labrador,Corner Brook, NL, Canada.
Squires, S.E., L. Hermanutz and P.L. Dixon. 2009. Agricultural insect pest compromises survival of two endemic Braya (Brassicaceae). Biological Conservation 142: 203 211.
Squires, S.E. 2010. Insect pests and pathogens compromise the persistence of two endemic and rare Braya (Brassicaceae). Ph.D. Thesis, Department of Biology, Memorial University of Newfoundland, St. John’s, Newfoundland and Labrador.
Author of Status Appraisal Summary
Luise Hermanutz, Department of Biology, Memorial University, St. John’s, NL
Susan Squires, Wildlife Division, Dept of Environment & Conservation, Corner Brook, NL
Claudia Hanel, Wildlife Division, Dept of Environment & Conservation, Corner Brook, NL
Range of occurrence in Canada: Newfoundland
|Is there an observed continuing decline in number of mature individuals?||yes|
|Estimated percent of continuing decline in total number of mature individuals within 5 years or 2 generations||23% decline over the last 10 years|
|Observed percent reduction or increase in total number of mature individuals over the last 10 years, or 3 generations.||23% decline over the last 10 years|
|Projected percent increase in total number of mature individuals over the next 10 years.||none|
|Inferred percent increase in total number of mature individuals over any 10 years, or 3 generations period, over a time period including both the past and the future.||none|
|Are the causes of the decline clearly reversible and understood and ceased?||some reversible and understood, not ceased|
|Are there extreme fluctuations in number of mature individuals?||No|
Extent and Occupancy Information
|Estimated extent of occurrence|
Actual EO = 14 km2 based on minimum convex polygon around observations. Due to COSEWIC convention the IAO cannot exceed the EO.
|Index of area of occupancy (IAO)|
(2x2 km grid) based on four populations: Anchor Point, Yankee Point, Sandy Cove [Airstrip, Lion's Club, Gravel Crusher], and Shoal Cove: 5 grids (Figure 1).
|Is the total population severely fragmented?||no|
|Number of locations*|
Based on the threats of insects and pathogens could rapidly affect all individuals in all populations in a single season.
|Is there an observed continuing decline in extent of occurrence?||no|
|Is there an observed and projected continuing decline in index of area of occupancy?||no|
|Is there an observed continuing decline in number of populations?||no|
|Is there an observed continuing decline in number of locations?||no|
|Is there an observed continuing decline in quality of habitat?||no|
|Are there extreme fluctuations in number of populations?||no|
|Are there extreme fluctuations in number of locations*?||no|
|Are there extreme fluctuations in extent of occurrence?||no|
|Are there extreme fluctuations in index of area of occupancy?||no|
* See definition of location.
Number of Mature Individuals (in each population)
|Population||Number of Mature Individuals|
|Anchor Point East (1998-2000 census 50)||not counted|
|Yankee Point natural (1998-2000 census 10)||2|
|Anthro (1998-2000 census 1600)||3224|
|Airstrip natural (1998-2000 census 900)||411|
|Anthro (1998-2000 census 2400)||778|
|Lion’s Club natural (1998-2000 census 180)||12|
|Anthro (1998-2000 census 760)||261|
|Crusher natural (1998-2000 census 800)||75|
|Anthro (1998-2000 census 500)||230|
|Shoal Cove Anthro (1998-2000 census 35)||556|
Threats (actual or imminent, to populations or habitats)
Rescue Effect (immigration from outside Canada)
|Status of outside population(s)?||Endemic to Newfoundland|
|Is immigration known or possible?||impossible|
|Would immigrants be adapted to survive in Canada?||n/a|
|Is there sufficient habitat for immigrants in Canada?||n/a|
|Is rescue from outside populations likely?||no|
Status and Reasons for Designation
|Reasons for designation:|
This regionally restricted Canadian endemic is known only from five sites within the limestone barrens on the island of Newfoundland. Since it was last assessed as Endangered in 2000, this species continues to experience declines in total population size and increases in the number and severity of biotic threats, which include the non-native Diamondback Moth and two pathogens.
Applicability of Criteria
The Committee on the Status of Endangered Wildlife in Canada (COSEWIC) was created in 1977 as a result of a recommendation at the Federal–Provincial Wildlife Conference held in 1976. It arose from the need for a single, official, scientifically sound, national listing of wildlife species at risk. In 1978, COSEWIC designated its first species and produced its first list of Canadian species at risk. Species designated at meetings of the full committee are added to the list. On June 5, 2003, the Species at Risk Act (SARA) was proclaimed. SARA establishes COSEWIC as an advisory body ensuring that species will continue to be assessed under a rigorous and independent scientific process.
The Committee on the Status of Endangered Wildlife in Canada (COSEWIC) assesses the national status of wild species, subspecies, varieties, or other designatable units that are considered to be at risk in Canada. Designations are made on native species for the following taxonomic groups: mammals, birds, reptiles, amphibians, fishes, arthropods, molluscs, vascular plants, mosses, and lichens.
COSEWIC comprises members from each provincial and territorial government wildlife agency, four federal entities (Canadian Wildlife Service, Parks Canada Agency, Department of Fisheries and Oceans, and the Federal Biodiversity Information Partnership, chaired by the Canadian Museum of Nature), three non–government science members and the co–chairs of the species specialist subcommittees and the Aboriginal Traditional Knowledge subcommittee. The Committee meets to consider status reports on candidate species.
- Wildlife Species
- A species, subspecies, variety, or geographically or genetically distinct population of animal, plant or other organism, other than a bacterium or virus, that is wild by nature and is either native to Canada or has extended its range into Canada without human intervention and has been present in Canada for at least 50 years.
- Extinct (X)
- A wildlife species that no longer exists.
- Extirpated (XT)
- A wildlife species no longer existing in the wild in Canada, but occurring elsewhere.
- Endangered (E)
- A wildlife species facing imminent extirpation or extinction.
- Threatened (T)
- A wildlife species likely to become endangered if limiting factors are not reversed.
- Special Concern (SC)*
- A wildlife species that may become a threatened or an endangered species because of a combination of biological characteristics and identified threats.
- Not at Risk (NAR)**
- A wildlife species that has been evaluated and found to be not at risk of extinction given the current circumstances.
- Data Deficient (DD)***
- A category that applies when the available information is insufficient (a) to resolve a species’ eligibility for assessment or (b) to permit an assessment of the species’ risk of extinction.
- Date Modified: