Small-flowered lipocarpha (Lipocarpha micrantha) COSEWIC assessment and status report: chapter 11

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TECHNICAL SUMMARY

Lipocarpha micrantha (Vahl) G. Tucker

Small Flowered Lipocarpha: Lipocarphe à petites fleurs

British Columbia, Ontario, Quebec (Extirpated)

Extent and Area information

·        extent of occurrence (EO)(km²): <20 km² for BC and ON sites

·        specify trend (decline, stable, increasing, unknown): declining

·        are there extreme fluctuations in EO (> 1 order of magnitude)?

·        area of occupancy (AO) (km²):about 5 km strip of narrow shoreline habitat (<1 km² )

·        specify trend (decline, stable, increasing, unknown):Declining

·        are there extreme fluctuations in AO (> 1 order magnitude)?Yes

·        number of extant locations: 3

·        specify trend in # locations (decline, stable, increasing, unknown):Declining

·        are there extreme fluctuations in # locations (>1 order of magnitude)?57% decline in extant locations

·        habitat trend:  specify declining, stable, increasing or unknown trend in area, extent or quality of habitat:declining extent and quality of habitat

Population information

·        generation time (average age of parents in the population) (indicate years, months, days, etc.):1 Year

·        number of mature individuals (capable of reproduction) in the Canadian population (or, specify a range of plausible values):30,000 to 50,000

·        total population trend:  specify declining, stable, increasing or unknown trend in number of mature individuals:unknown but historic loss of 70% of its habitat at the Osoyoos site

·        if decline, % decline over the last/next 10 years or 3 generations, whichever is greater (or specify if for shorter time period)

·        are there extreme fluctuations in number of mature individuals (> 1 order of magnitude)?Yes

·        is the total population severely fragmented (most individuals found within small and relatively isolated (geographically or otherwise) populations between which there is little exchange, i.e., < 1 successful migrant / year)?Yes

·        list each population and the number of mature individuals in each

Lake Osoyoos1, 30,000 to 50,000

Lake Osoyoos2, Extirpated

Sable Island, 1,800

Pound Net Bay, 70?

Detroit River, Extirpated

Holiday Beach, Extirpated

Missisquoi Beach, Extirpated

·        specify trend in number of populations (decline, stable, increasing, unknown): decline

·        are there extreme fluctuations in number of populations (>1 order of magnitude)?57% decline

Threats (actual or imminent threats to populations or habitats)

- habitat destruction for development; decaying aquatic vegetation; invasive plant species

- water level manipulation; recreational use of shorelines

Rescue Effect (immigration from an outside source)

·        does species exist elsewhere (in Canada or outside)?Yes

·        status of the outside population(s)?Unknown

·        is immigration known or possible?Yes

·        would immigrants be adapted to survive here?Unknown

·        is there sufficient habitat for immigrants here?unknown

Quantitative Analysis