Rubber boa (Charina bobttae) COSEWIC assessment and status report: chapter 12

Range of Occurrence in Canada:

British Columbia

extent of occurrence (EO)(km²) :

73,000 km²

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

unknown

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

Unknown

area of occupancy (AO) (km²) :

24,300 km²

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

Unknown

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

Unknown

number of extant locations :

Unknown

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

Unknown

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

Unknown

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

Declining quality

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

>5 years

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

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)?

No

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

Populations are associated with the following major watersheds: Fraser (south), Thompson, Similkameen, Okanagan, Columbia, Kootenay

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

Unknown

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

Unknown

does species exist elsewhere (in Canada or outside)?

Western United States

status of the outside population(s)?

Secure in north

is immigration known or possible?

Unknown, unlikely

would immigrants be adapted to survive here?

Unknown

is there sufficient habitat for immigrants here?

Yes