Van brunt’s jacob’s-ladder (Polemonium vanbruntiae) COSEWIC assessment and status report: chapter 12

Range of Occurrence in Canada:

Quebec

extent of occurrence (EO) (km²)

644 km²

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

No

area of occupancy (AO) (km²)

About 5 ha

specify the trend (on the decline, stable, growing, unknown)

Slight decline

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

No

number of existing locations

8 areas with 11 sub-populations

specify the trend (on the decline, stable, growing, unknown)

Slight decline

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

No

habitat trend: specify the trend: on the decline, stable, growing, unknown of the area, extent or quality of the habitat

Slight decline Information on the population

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

Primarily about 2 years to ample flowering for many species of this genus

number of mature specimens (able to reproduce) in the Canadian population (or specify a scale of plausible values)

20,000 est

total population trend: specify the trend: on the decline, stable, growing or unknown of mature specimens

Slight decline

if the trend is on the decline, % of decline over the last/next 10 years or 3 generations, the one that is bigger (or specify that it involves a shorter period)

About 4 to 7%

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

No

is the total population seriously fragmented (most of the specimens are found in small populations, that are relatively isolated (geographically or otherwise) between which there are few exchanges, namely, < 1 successful migration/year)?

Yes

List each population and give the number of mature specimens in each population

1. Saints-Martyrs: 900
2. Développement-Boisvert-Est:13,000
3. Développement-Boisvert-Ouest: 330
4. Saint-Adrien: 1
5. Saint-Camille: 2,000
6. Ham-Sud: 300
7. Stoke River: 3,000
8. Mont-Carrier-Sud: 70

Specify the trend in the number of populations (on the decline, stable, growing, unknown)

Trend?  New pops. found in sites previously not surveyed

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

No

Threats (real or imminent for the populations or the habitats)

• Agriculture (mowing, drainage, ploughing, cultivation of Christmas trees);
• logging (felling, drainage);
• road infrastructures (prolonged flooding);
• residential development;
• off-road vehicle trails and use of such vehicles.

Rescue effect (immigration from an outside source)

Unlikely due to disjunction from main range

Does the species exist elsewhere (in Canada or abroad)?

In New Brunswick:? (potential)
In the United States: yes

Status of the populations elsewhere?

Maine: endangered (S1)
New York: rare (S3)
Vermont: threatened (S2)

Is immigration known or possible?

Unlikely?

Would immigrants adapt to survive at this place?

Yes

Does a sufficient habitat exist at this place for immigrants?

Yes