Lemmon’s holly fern (Polystichum lemmonii) COSEWIC assessment and status report: chapter 11

Range of Occurrence in Canada:

British Columbia

extent of occurrence (EO) (km²) :

2.4 ha

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

Stable

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

No

area of occupancy (AO) (km²) :

2.4 ha

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

Stable

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

No

number of extant locations :

1

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

Stable

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

No

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

Stable

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

Years-unknown

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

853

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)

-

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

-

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)?

All individuals found within a small and relatively isolated area

list each population and the number of mature individuals in each

Baldy Mountain– 853

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)?

USA

status of the outside population(s)?

G5

is immigration known or possible?

Possible

would immigrants be adapted to survive here?

Unknown

is there sufficient habitat for immigrants here?

Few ultramafic areas