Thread-leaved sundew (Drosera filiformis) COSEWIC assessment and status report: chapter 12

Range of Occurrence in Canada:

NS

extent of occurrence (km²) :

ca. 77 km² (NS, DNR)

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

stable

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

no

area of occupancy (km²) :

ca. 11.5 km² (NS, DNR)

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

stable

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

no

number of extant locations :

5

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.) :

likely >5 years

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

thousands

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)? :

no

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)?

yes

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

numbers in the thousands for each

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)?

yes

status of the outside population(s)?

abundant

is immigration known or possible?

not likely due to disjunction

would immigrants be adapted to survive here?

yes

is there sufficient habitat for immigrants here?

limited