Wild hyacinth (Camassia scilloides) COSEWIC assessment and status report: chapter 7

Population Sizes and Trends

Populations were resurveyed in 2001 and compared with earlier records (table 1). Numbers are based on flowering stalks (one per bulb). Non-flowering immature bulbs were not included (except for Middle Island) since it is very difficult to separate leaves from underground bulbs or the leaves of flowering plants. Previous counts were rough estimates and lacking for Hen Island. If a similar number is assumed for Hen Island in the 1980s, then the two totals become very similar and the difference likely does not represent a significant increase.

Table 1. Ontario Populations of Camassia scilloides
Status Population Location Core, 1948 Oldham, 1988 2001 survey
  1. Pelee Island
  • Fish Point 1
  • Fish Point 2
 
  • 325-375
  • 150-200
Total: 2090
  2.
  • Stone Road Alvar 1
  • Stone Road Alvar 2
  • Stone Road Alvar 3
 
  • 1,000-2,000
  • 1
  • 3

Total: 4,485
  3.
  • Middle Pt.
  • M. Pt., E. (new)
  2,500-3,000
  • 4750
  • 112
  4.
  • Middle Island
  • M.I. S. (new)
  5,000+
  • (700 veg. only)
  • 865
  5. Middle Sister Island + 5,000+ 3,230
  6. Hen Island + + 5680
Extirpated 1a. Pelee Island Fish Point, Mosquito Pt. #     0
Extirpated 7. East Sister Island   100-300 0
Extirpated 8. North Harbour Island + 0*  
Extirpated 9. Bois Blanc I. (Detroit R.) (Last recorded in 1882) 0*  
  Total     14,000-16,000 21,212 in flower

Legend:

+ : presence (numbers not specified)
0 : absence
* : habitat altered or destroyed and no longer present, from recent intensive field checks by Oldham and Waldron.
# : Kamstra, et al., 1993, population noted, without count.

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