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Response Statements

  • Response Statement - American Marten, Newfoundland population (2022)
    This species is a geographically isolated, and genetically and ecologically distinct population. This is one of only 14 mammal species endemic to the island of Newfoundland. The population decline began in the early 20th century and was largely the result of direct and incidental harvest. Current data and a recent population estimate suggest that distribution and abundance have increased since the last COSEWIC assessment in 2007. These increases ...
  • Response Statement - Black-footed Ferret (2022)
    This is the only ferret species native to North America. Disease and the persecution of its primary prey, Black-tailed Prairie Dog, resulted in the extirpation of ferret from Canada. Captive-bred ferrets were released from 2009 to 2012 in Grasslands National Park, Saskatchewan. Prior to those efforts, this species was last observed in 1937. Insufficient prey resulted in suspension of the release program in 2013, and intensive monitoring has revea ...
  • Response Statement - Bobolink (2022)
    This grassland songbird undertakes an annual round-trip migration of approximately 20,000 km between its breeding grounds in southern Canada and wintering range in central South America. Over 25% of the global population breeds in Canada, mostly from Saskatchewan to Quebec. Population size decreased sharply throughout the 1980s and 1990s, and has since continued to decline, but at a slower rate. Based on improved analytical techniques, the ten-ye ...
  • Response Statement - Brassy Minnow, Missouri population (2022)
    This small, primarily herbivorous minnow inhabits headwater lakes and slow-moving streams with low fish diversity. This population occurs in Canada only in extreme southeastern Alberta and southwestern Saskatchewan, in the Missouri Watershed. Its overall abundance and population trends are unknown. Substantial cumulative threats to its persistence include loss of available habitat resulting from the interaction between water management practices ...
  • Response Statement - Brassy Minnow, Pacific population (2022)
    This small, primarily herbivorous minnow inhabits headwater lakes and slow-moving streams with low fish diversity. It has a disjunct distribution within Canada in two discrete regions of southwestern and central British Columbia, within the Pacific watershed. Its abundance and population trends are unknown. This population may become Threatened if factors suspected of negatively influencing its persistence are not reversed or effectively managed, ...
  • Response Statement - Brassy Minnow, Western Arctic population (2022)
    This small, primarily herbivorous minnow inhabits headwater lakes and slow-moving streams with low fish diversity. This population is endemic to Canada, occurring only in central British Columbia and central Alberta within watersheds that flow north to the western Arctic Ocean. Although this fish is still abundant at Musreau Lake, Alberta, its population trends are unknown, and its overall distribution may be shrinking. Substantial cumulative thr ...
  • Response Statement - Dense Draba (2022)
    This small plant occurs on rock outcrops, cliffs, and talus slopes within 2.5 km of the coast along the Gaspe Peninsula and Strait of Belle Isle (Quebec, Newfoundland & Labrador), and is found nowhere else in the world. Fewer than 3000 plants are currently known, occupying a small portion of seemingly abundant suitable habitat. Invasive introduced plant species are degrading the draba’s habitat. As most plant colonies consist of only a few indivi ...
  • Response Statement - Dukes' Skipper (2022)
    This wetland specialist butterfly is found in open hardwood swamps and clearings of extreme southwestern Ontario. The species has a restricted range within the counties of Essex, Chatham-Kent, and Lambton, with only 12 known extant subpopulations. Its historical habitat has changed since European settlement, which has led to geographical isolation of suitable wetland patches. Larvae feed on native sedges that are displaced when the invasive Europ ...
  • Response Statement - Dusky Dune Moth (2022)
    This moth is restricted to a handful of open, active sand dunes and blowouts on the Prairies. Beginning in the 1940s, these dunes have slowly become more stabilized and vegetated, and the area of open sand of many dunes has declined by an estimated 10-40% per decade. The decline in dune area has reduced the moth’s habitat and has resulted in a more fragmented landscape. Although the moth can be common where it is found, it occurs in only a small ...
  • Response Statement - Dwarf Wedgemussel (2022)
    This freshwater mussel was previously known in Canada from only the Petitcodiac River drainage in New Brunswick. It disappeared after construction of a causeway across the river in 1967/68, presumably because of the loss of the host fishes which are required for completion of the mussel species life cycle. The species has not been found since, despite intensive systematic searches of its former habitat. The causeway has been partially removed, an ...
  • Response Statement - Eastern False Rue-anemone (2022)
    This perennial forest herb is at the northern edge of its range and in Canada is restricted to a few fragmented riverside sites in southwestern Ontario. It occurs in six subpopulations that are at risk of decline in area and quality of habitat resulting from various activities, including recreational trail use and expansion of exotic invasive plants. Since the previous assessment, COSEWIC has changed its interpretation and application of the term ...
  • Response Statement - Eastern Foxsnake, Carolinian population (2022)
    This large, non-venomous snake is confined to a few small disjunct areas of southwestern Ontario within a landscape subjected to intensive agriculture and urbanization and crisscrossed by a network of roads. New information since the last assessment includes better understanding of population genetic structure, abundance, and habitat use, and clarification of threats. Aggregation of snakes at hibernation sites increases their vulnerability to nat ...
  • Response Statement - Eastern Foxsnake, Great Lakes / St. Lawrence population (2022)
    This large, non-venomous snake is restricted to the eastern shoreline of Georgian Bay, where it reaches the northern limits of its distribution. Population size is small, most likely less than 2000 mature individuals, but further sampling of historical sites is required. Large aggregations of snakes at hibernation sites increase their vulnerability to natural catastrophes and human disturbance. Long seasonal migrations to and from these sites pla ...
  • Response Statement - Eastern Sand Darter, Quebec population (2022)
    This small fish prefers the sandy bottom areas of lakes and streams into which it burrows. This specific habitat preference make it extremely susceptible to habitat changes related to human impacts. It is also negatively impacted by invasive species, such as Round Goby, which have invaded its preferred habitat. As a result, there is a continuing decline in habitat quality and quantity and, hence, abundance. The species no longer meets the current ...
  • Response Statement - Eastern Sand Darter, Southwestern Ontario population (2022)
    This small fish prefers the sand bottom areas of lakes and streams into which it burrows. This specific habitat preference makes it extremely susceptible to habitat changes caused by agricultural impacts. It is also negatively impacted by invasive species, such as Round Goby, which have invaded its preferred habitat. As a result, there is a continuing decline in habitat quality and quantity. As a result, fish numbers are declining, and three hist ...

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