Western toad (Bufo boreas) COSEWIC assessment and status report: chapter 12

Range of Occurrence in Canada:

YT NT BC AB Parks YFWMB

extent of occurrence (EO) (km²)

Based on map Fig. 3 in report: Ca. 1,300,000 km²

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

Stable

are there extreme fluctuations in EO?

No

area of occupancy (AO) (km²):

Ca. 130,000 km²

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

Decline especially on Vancouver Island and adjacent mainland

are there extreme fluctuations in AO ?

No

number of extant locations:

A great many

specify trend in #:

Decline especially on Vancouver Island and adjacent mainland

are there extreme fluctuations in # locations?

No

habitat trend:

Declining quality & extent especially on Vancouver Island and adjacent mainland

generation time:

3 – 4 yrs

number of mature individuals:

unknown

total population trend:

Decline especially on Vancouver Island and adjacent mainland

% decline over the last/next 10 years or 3 generations.

unknown

extreme fluctuations in number of mature individuals?

Most probably

is the total population severely fragmented?

yes

list populations with number of mature individuals in each:

unknown

are there extreme fluctuations in number of populations?

no

Rescue Effect (immigration from an outside source)?

negligible

does species exist elsewhere (in Canada or outside)?

yes