Abstract
Four aspects of the life histories of the two populations of powan Coregonus lavaretus (L.) in Scotland are described: growth (Eck powan are shorter and with greater year to year variance than Lomond); sexual maturation (Eck powan mature younger, but at similar weight to Lomond); spawning (timing in Eck varies, but is consistent in Lomond); and recruitment/mortality (fecundity, sex ratios, and mortality also vary in the short term). Short term differences between the physiological ecology of the populations can be ascribed to the size and topography of the lochs. Long term differences are more difficult to account for, and are more important in that they may signal changes in sustainability. Conservation of powan must be considered in terms of their synecological relationships, not in isolation.
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Brown, E.A.R., Scott, D.B.C. Life histories of the powan, Coregonus lavaretus (L.) (Salmonidae, Coregoninae) of Loch Lomond and Loch Eck. Hydrobiologia 290, 121–133 (1994). https://doi.org/10.1007/BF00008959
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DOI: https://doi.org/10.1007/BF00008959