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COSEWIC Assessments

  • COSEWIC Status Appraisal Summary on the Eastern Persius Duskywing Erynnis persius persius in Canada (2017)
    This lupine-feeding butterfly has been confirmed from only two localities in Canada. It inhabits oak savannas in southern Ontario, a habitat that has undergone substantial declines and alterations. Larval host-plant populations have been greatly reduced. There have been no confirmed reports of this butterfly since 1987, but there have been no intensive surveys for the species since 2003. This, combined with its similarity with other duskywings, m ...
  • COSEWIC Status Appraisal Summary on the Pacific Water Shrew Sorex bendirii in Canada (2017)
    This shrew is restricted to British Columbia’s Lower Mainland and adjacent low valleys. It is rare there, associated with freshwater streams and adjacent wet habitats. Urban development, agriculture, and forestry have reduced the amount and quality of habitat. There is an inferred and projected ongoing decline in habitat and subpopulations in much of its range in Canada.
  • COSEWIC status appraisal summary on the Round Pigtoe Pleurobema sintoxia in Canada (2016)
    This mussel species occupies a small area in the Lake St. Clair watershed and three other watersheds in southern Ontario, where its habitat has been declining in extent and quality. Urban development, agricultural runoff, and impacts from the Zebra Mussel and the Round Goby are threatening the survival of the species in Canada.
  • COSEWIC status appraisal summary on the River Redhorse Moxostoma carinatum in Canada (2016)
    This freshwater fish species occurs in rivers in densely populated regions of Ontario and Quebec. Although collected at new locations in both Ontario and Quebec, the species has likely been extirpated from several rivers within its range. It comes close to meeting Threatened criteria due to a small area of occupancy and relatively few locations. Its persistence is limited by barriers to movement, altered flow regimes, turbidity, eutrophication an ...
  • COSEWIC Status Appraisal Summary on the North Pacific Right Whale Eubalaena japonica in Canada (2016)
    After an absence of verified sightings of the species in Canadian waters for over 60 years, sightings of two separate individuals in 2013 confirmed that the current range includes Canadian waters. The numbers in the eastern North Pacific are extremely low, with estimates of fewer than 50 individuals in the southeastern Bering Sea, the only known area of regular occurrence of this population. It is most unlikely that the number of mature animals e ...
  • COSEWIC Status Appraisal Summary on the Banded Cord-moss Entosthodon fascicularis in Canada (2016)
    This rare moss is largely restricted to southwestern British Columbia in Canada, with most occurrences in the threatened Garry Oak habitat. One past collection was made in the Kootenay region in southeastern British Columbia, but whether the species still persists there is unknown. Should habitat destruction and degradation continue, the species will become increasingly vulnerable.
  • COSEWIC Status Appraisal Summary on the Ottoe Skipper Hesperia ottoe in Canada (2016)
    The species is a short grass and sand prairie specialist that occurs in small isolated populations within the fragmented and declining prairie habitats of southwestern Manitoba. Historically, this species has been found at only three sites in Canada. Any remaining populations in its historical range must be restricted to a very small area in southwestern Manitoba. Recent search effort has not recorded the species, but there is unsurveyed habitat ...
  • COSEWIC status appraisal summary on the Ancient Murrelet Synthliboramphus antiquus in Canada (2015)
    Approximately half of the global breeding population of this burrow-nesting seabird occurs on Haida Gwaii, British Columbia. Recent survey information for the species is limited and the overall population trend is unknown. There is, however, evidence of declines at some breeding colonies on the west coast of Haida Gwaii, although populations may be increasing at some colonies on the east coast. The species is exposed to a number of threats includ ...
  • COSEWIC status appraisal summary on the Frosted Glass-whiskers Sclerophora peronella in Canada (2015)
    Atlantic population- This tiny stubble lichen is rare over much of its global range; in Canada, thirteen occurrences are in Nova Scotia. The lichen is known only from the exposed heartwood of old red maple trees in wetlands or uplands. The main threat is the loss of habitat and tree removal associated with increased harvesting of upland and ‘low grade’ wetland hardwoods for biomass energy generation, firewood and other products. A second threat i ...
  • COSEWIC status appraisal summary on the Grass Pickerel Esox americanus vermiculatus in Canada (2015)
    This fish is known from relatively few locations from southern Lake Huron to western Quebec. The subspecies has a scattered distribution in Canada and is not abundant in any area. The subspecies could become threatened if habitat quality continues to decline owing to changes in land use and invasive species.
  • COSEWIC Status Appraisal Summary on the Spotted Sucker Minytrema melanops in Canada (2015)
    This species is a relatively rare fish that inhabits lakes and rivers in southwestern Ontario. Its spatial distribution has remained relatively constant in these environments but there are indications that occurrence has declined in the Lake Erie part of its range. Specific threats are poorly understood, but the species is likely sensitive to high turbidity, which is common in the degraded environments it inhabits. The species may become Threaten ...
  • COSEWIC Status Appraisal Summary on the Twisted Oak Moss Syntrichia laevipila in Canada (2015)
    This moss occurs from British Columbia and Washington southward to California. The Canadian populations, which are at the northern limits of the species’ range in western North America, occur only in the area of southeastern Vancouver Island and the Gulf Islands. The species is known from more than 90 sites where it is largely restricted to the bark of trees, especially Garry Oak. This species is never dominant where it grows, nor is it frequent ...
  • COSEWIC Status Appraisal Summary on the Western Skink Eumeces skiltonianus in Canada (2015)
    The Canadian distribution of the species is within a densely populated region of the Southern Interior of British Columbia that is undergoing extensive development. Increased survey efforts within the past 10 years have resulted in the discovery of the species at new localities within the known range. Nevertheless, the range remains small and human activities and land use practices continue to threaten skink habitats.
  • COSEWIC Status Appraisal Summary on the Columbian Carpet Moss Bryoerythrophyllum columbianum in Canada (2015)
    This is a small, perennial moss that is endemic to western North America. In Canada, it has a restricted distribution in the shrub-steppe of the semi-arid Southern Interior of British Columbia. Surveys have confirmed its presence from 22 sites. The species is never abundant where it is found and recent surveys have provided few new locations. The species is patchily distributed at low densities. At least one population is believed to have been lo ...
  • COSEWIC status appraisal summary on the Spotted Bat Euderma maculatum in Canada (2015)
    This distinctly patterned bat is found in the dry intermontane grasslands of southern British Columbia. A cliff-roosting bat, its patchy distribution and specialized roosting needs suggest a relatively small population size. The main threats to foraging habitat in valley bottoms or roosting locations are urban development, land conversion for orchards and vineyards, roads, mining and exploration, recreational activities (e.g., rock climbing), and ...

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