Spoon-leaved moss (Bryoandersonia illecebra) COSEWIC assessment and status report: chapter 11

Technical Summary

Bryoandersonia illecebra (Hedw.) H. Rob.

Spoon-leaved Moss – Andersonie charmante

Range of Occurrence in Canada:
Ontario

Extent and Area information

extent of occurrence (EO) (km²)
----
specify trend (decline, stable, increasing, unknown)
Stable
are there extreme fluctuations in EO (> 1 order of magnitude)?
No
area of occupancy (AO) (km²)
much less than 500 km² (combined area of all woodlots)
specify trend (decline, stable, increasing, unknown)
unknown
are there extreme fluctuations in AO (> 1 order magnitude)?
No
number of extant locations
3 confirmed of 8 recent records
specify trend in # locations (decline, stable, increasing, unknown)
Possible decline, from 6 previous – added 1 (2?) new for a total loss of 5 localities. Although the 5 sites were intensively search, there is some possibility that the species persists in all/some of those 5 sites.
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
Unknown

Population information

generation time (average age of parents in the population) (indicate years, months, days, etc.)
Not known, but species is long lived perennial (10’s of years)
number of mature individuals (capable of reproduction) in the Canadian population (or, specify a range of plausible values)
4 colonies found in 2002; does not reproduce sexually in Canada; asexual reproduction unknown, but possible for the species
total population trend:  specify declining, stable, increasing or unknown trend in number of mature individuals
Possibly declining
if decline, % decline over the last/next 10 years or 3 generations, whichever is greater (or specify if for shorter time period)
Unknown
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
Details see Table 3; 4 colonies/ ~ 13.5
specify trend in number of populations (decline, stable, increasing, unknown)
Decline possible – not relocated at 5 previous localities
are there extreme fluctuations in number of populations (>1 order of magnitude)?
No

Threats (actual or imminent threats to populations or habitats)

None known, but all sites in close proximity to human activity (roads and trails)

Rescue Effect (immigration from an outside source)

does species exist elsewhere (in Canada or outside)?
Yes
Status of the outside population(s)?
Not at Risk
is immigration known or possible?
Possible, but not likely
Would immigrants be adapted to survive here?
Yes
is there sufficient habitat for immigrants here?
Yes

Quantitative Analysis

N/A

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