Athabasca thrift (Armeria maritima) COSEWIC assessment and status report: chapter 14

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Technical Summary

Armeria maritima ssp. interior

Athabasca thrift

Arméria de l’Athabasca

Occurrence: Saskatchewan

Extent and Area Information

Extent of occurrence (EO) ( km² )

<2000 km ²

specify trend (decline, stable, increasing, unknown)

Stable

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

No

area of occupancy (AO) ( km² )

likely <<500 km ² but >20 km ²

specify trend (decline, stable, increasing, unknown)

likely stable

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

No

number of extant locations

18 collections

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

Unknown

are there extreme fluctuations in # locations (>1 order of magnitude)?

not likely

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

likely stable

Population Information

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

perhaps 2-3 yrs (life span is about 3-5 yrs)

number of mature individuals (capable of reproduction) in the Canadian population (or, specify a range of plausible values)

Unknown

total population trend: specify declining, stable, increasing or unknown trend in number of mature individuals

unknown trend but likely stable

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)?

not likely

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)?

found in 3 sand dune areas but mainly restricted there to gravel barrens habitats and dune slacks

list each population and the number of mature individuals in each

unknown population size

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

unknown but likely stable

are there extreme fluctuations in number of populations (>1 order of magnitude)?

not likely

Threats

• limited threats from visitor use of the park, especially through ATV activity

Rescue Effect (immigration from an outside source): none (endemic)

does species exist elsewhere (in Canada or outside)?

status of the outside population(s)?

is immigration known or possible?

would immigrants be adapted to survive here?

is there sufficient habitat for immigrants here?

Quantitative Analysis