Kellogg’s rush (Juncus kelloggii) COSEWIC assessment and status report: chapter 12

Range of Occurrence in Canada:

British Columbia

Extent of occurrence (EO) (km²) :

25m²

Specify trend (decline, stable, increasing, unknown) :

Stable

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

Not known

Area of occupancy (AO) (km²) :

25m²

Specify trend (decline, stable, increasing, unknown) :

decline based on gravel dumping on part of the single site

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

Not known

Number of extant locations :

One

Specify trend in # locations (decline, stable, increasing, unknown):

Stable

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

Not applicable

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

Some reduction in size has occurred

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

one year

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

3-600

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

Stable

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

Not applicable

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)?

single tiny site

List each population and the number of mature individuals in each :

fluctuation of 3-600 at a single site

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

Stable

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

No

Does species exist elsewhere (in Canada or outside)?

Not in Canada; Washington (WA), Oregon (OR) and California (CA)

Status of the outside population(s)?

• WA: S1
• OR: SU
• CA: SR

Is immigration known or possible?

Unlikely

Would immigrants be adapted to survive here?

Not known

Is there sufficient habitat for immigrants here?

Not known