Limnologic consequences of the decline in hemlock 4800 years ago in three Southern Ontario lakes |
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| Authors: | Mary M. Boucherle John P. Smol Tracie C. Oliver S. R. Brown R. McNeely |
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| Affiliation: | (1) Department of Biology, Queen's University, K7L 3N6 Kingston, Ontario, Canada;(2) Terrain Sciences Division, Geological Survey of Canada, 601 Booth Street, K1A 0E8 Ottawa, Ontario, Canada;(3) Present address: Grassy Fork Fisheries, P.O. Box 154, 46151 Martinsville, Ind., U.S.A. |
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| Abstract: | Four thousand eight hundred years ago hemlock (Tsuga canadensis) populations were decimated throughout eastern North America. We have studied the effects of this loss from the terrestrial community on three Southern Ontario lakes: Little Round Lake, Sunfish Lake, and McKay Lake. This study includes the use of cladocerans, diatoms, chrysophytes, and bacterial pigments to assess the limnologic changes that occurred in these lakes. Each lake experienced a change in trophic status that coincided with the loss of hemlock from its catchment, but the change in the aquatic biota was different in each lake. The lakes' size may have been the most influential factor governing the response to this terrestrial disturbance. |
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| Keywords: | Cladocera diatoms eutrophication hemlock pigments vegetational change |
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