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A regional paleolimnological assessment of the impact of clear-cutting on lakes from the central interior of British Columbia

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Abstract:

The impact of forest harvesting on lakes within the central interior of British Columbia was examined in a paleolimnological study of six lakes that had 28–82% of their watersheds clear-cut (impact lakes) and four lakes that had experienced no logging in their watersheds (reference lakes). Changes in diatom species composition and percent organic matter in 210Pb-dated sediment cores were compared over the last 80 years in each of the impact lakes before and after the onset of forest harvesting and, in the reference lakes, before and after 1960 (the average onset of logging in five of the six impact lakes) and before and after 1975 (the onset of logging in one impact lake). Significant changes in species composition of diatoms following forest-harvesting activities were detected in four of the impact lakes and three of the reference lakes; however, the changes in diatom species composition were small, with changes in the relative abundance of the most common species being at most 11%. Significant increases in the percent organic matter after 1960 were found in one impact lake and three reference lakes; again these changes were small, with increases of 2–5%.

L'étude paléolimnologique de six lacs dont 28–82% du bassin versant a été soumis à la coupe à blanc (lacs affectés) et de quatre autres lacs dont le bassin versant n'a pas été modifié (lacs témoins) a permis d'évaluer l'impact de la coupe de la forêt sur les lacs dans la région intérieure centrale de la Colombie-Britannique. Les changements dans la composition spécifique des diatomées et dans le pourcentage de matière organique dans des carottes de sédiments datés au 210Pb ont été comparés au cours des 80 dernières années, soit dans chacun des lacs affectés avant et après la coupe et dans les lacs témoins, avant et après 1960 (la date moyenne du début de la coupe dans cinq des six lacs affectés), de même qu'avant et après 1975 (la date du début de la coupe dans un des lacs affectés). Des changements significatifs dans la composition spécifique des diatomées après la coupe ont été trouvés dans quatre des lacs affectés et trois des lacs témoins; cependant, ces modifications étaient faibles, les variations dans la composition relative des espèces communes atteignant tout au plus 11%. Des augmentations significatives du pourcentage de matière organique après 1960 ont été observées dans un lac affecté et trois lacs témoins; ces hausses étaient faibles, de l'ordre de 2–5%.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: March 1, 2001

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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