Dwarf hackberry (Celtis tenuifolia) COSEWIC assessment and status report: chapter 11

Summary of Status Report

Dwarf hackberry is known to occur in six populations in southern Ontario, as part of about twenty disjunct populations in the southern Great Lakes region that are separated from the main distribution of the species south of the limits of glaciation in eastern North America. As a species of severe and dynamic habitats, only a few individuals appear to reach a maximum age of 40-65 years, with much mortality of juveniles and some continuing losses of reproductive individuals due to natural or human disturbance. In 2002, populations appear to be holding steady compared to the inventory of 1984 and precise counts in 1989-90; increases likely represent more rigorous surveying and the finding of previously unknown sites. Habitats of the six sites appear secure except for the threat of limestone quarrying on alvar sites and sand extraction in eastern Ontario.

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