An assessment of leeches (Hirudinea) as indicators of lake acidification
- 1 January 1991
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Zoology
- Vol. 69 (1) , 130-133
- https://doi.org/10.1139/z91-019
Abstract
To assess their value as indicators of acidification, leeches (Hirudinea) were surveyed with baited traps in 40 small lakes covering a wide pH range near Sudbury, Ontario. Leeches were caught in all 20 lakes with pH >5.5, and represented nine species. Leeches, representing four species, were caught in only 4 of 20 lakes with pH ® were provided on 20 lakes for cocoon deposition by Nephelopsis obscura. After 30 days, cocoons were deposited on surfaces on 10 of 13 lakes with pH ≥5.2, but were not deposited at lower pH.Keywords
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