Effects of managed buffer zones on fauna and habitat associated with a headwater stream in the Indian Bay watershed in northeast Newfoundland

• Main Author: Wells, Jacquelyn M.
• Format: Thesis
• Language: English
• Published: Memorial University of Newfoundland 2002
• Subjects: Canada; Indian; Atlantic salmon; Newfoundland; Salmo salar
• Online Access: https://research.library.mun.ca/1312/; https://research.library.mun.ca/1312/1/Wells_JacquelynM.pdf; https://research.library.mun.ca/1312/3/Wells_JacquelynM.pdf

The effectiveness of managed buffer zones in protecting an aquatic ecosystem during forest harvesting was studied for a two year period on a small headwater stream in northeastern Newfoundland, Canada. The study consisted of examining several components including abiotic (water temperature and sedimentation) and biotic (macroinvertebrates and salmonids). These components were studied pre- and post-harvest to determine the impact of the following riparian management schemes: 20 m no harvest buffer; 20 m buffer with 30 % of the basal area harvested; 30-50 m buffer with 30 % of the basal area harvested; and a no harvest 'control' site. -- Sedimentation significantly increased for the 20 m buffer with selective harvesting. Water temperature was slightly impacted within the optimum temperature class for brook trout (Salvelinus foniinalis) only with a significant decrease for the 30-50 m buffer with selective harvesting and the 20 m buffer with selective harvesting. The stress and lethal temperature classes were not significantly different between pre- and post-harvest observations. The water temperature significantly increased within the upper and lethal temperature classes for Atlantic salmon (Salmo salar) within the 30-50 m buffer with selective harvesting. -- The effects of selective harvesting on aquatic macroinvertebrates varied depending on the index and taxon. The number of Ephemeroptera, Plecoptera, and Trichoptera (EPT) divided by the number of Diptera index was not significantly affected by site and year. However, the number of total EPT? Ephemeroptera, Plecoptera, Trichoptera, Diptera (excluding Chironomidae) and Chironomidae were all significantly affected by site and year. The most notable difference between pre- and post-harvest occurred within the 20 m buffer, where a large increase in Oxythira sp., an algal consumer, was observed. The number of species observed for each of the sites was slightly greater post-harvest, however the differences were not significant. -- Brook trout and Atlantic salmon ...