Synopsis
This study provides a case history of the impact of the 1998 El Niño event on a lake charr population in a shallow (maximum depth = 13 m) lake in the southern boreal shield ecozone of Ontario. The lake lost its native charr population by acidification from air-borne pollutants in the 1950–1960s. A naturally reproducing population was re-established through hatchery stocking after the water quality improved in the 1980s. The warm years triggered by the El Niño event exposed fish to bottom water temperatures of 20°C for several weeks and resulted in the loss of all hatchery-reared juveniles that were released in 1998. A few adults survived the warm years by making use of cold water refuge areas (groundwater seepage). This study shows how climate change can eliminate charr populations at the margins of their range. It also illustrates the potential confounding effects of climate warming on aquatic ecosystems already subject to other stressors.
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Gunn, J.M. (2002). Impact of the 1998 El Niño event on a lake charr, Salvelinus namaycush, population recovering from acidification. In: Magnan, P., Audet, C., Glémet, H., Legault, M., Rodríguez, M.A., Taylor, E.B. (eds) Ecology, behaviour and conservation of the charrs, genus Salvelinus . Developments in environmental biology of fishes, vol 22. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1352-8_32
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DOI: https://doi.org/10.1007/978-94-017-1352-8_32
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