Stave River Water Use Plan - BC Hydro

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Stave River Water Use Plan Monitoring Terms of Reference June 13, 2005 2.7 References Dodds, W. K. 2003. The role of periphyton in phosphorus retention in shallow freshwater aquatic systems. Journal of Phycology. 39:840-849. Failing, L. 1999. Stave River Water Use Plan: Report of the consultative committee. Prepared by Compass Resource Management Ltd for BC Hydro. October 1999. 44 pp. + App. Klut, M.E., J.G. Stockner, and T. Bisalputra. 1989. Further use of fluorochrome in the cytochemical characterization of phytoplankton. Histochem. J. 21: 645-50. Liboriussen, L. and E. Jeppensen. 2003. Temporal dynamics in epipelic, pelagic, and epiphytic algal production in a clear and turbid shallow lake. J. Freshwater Biology. 48(3):418-431 Shortreed, K.S., A.C. Costella, and J.G. Stockner. 1984. Periphyton biomass and species composition in 21 British Columbia lakes: seasonal abundance and response to whole-lake nutrient additions. Can. J. Bot. 62: 1022-1031. Stockner, J.G. and F.A.J. Armstrong 1971. Periphyton of the experimental lakes Area, Northwestern Ontario. J. Fish. Res. Bd. Canada 28: 215-29. Stockner, J.G., and K.S. Shortreed. 1985. Whole-lake fertilization experiments in coastal British Columbia: empirical relationships between nutrient inputs and phytoplankton biomass and production. C. J. Fish. Aquat. Sci. 42: 649-58. Stockner, J. G. and J. Beer. 2004. The limnology of Stave/Hayward reservoirs: with a perspective on carbon production. Prepared for BC Hydro Water Use Plans by Eco-logic Ltd. and University of British Columbia, Institute For Resources, Environment and Sustainability, Vancouver. 33 pp. + App. Vollenweider, R, A. 1975. Input-outout models, with special refernce to the phosphorus loading concept in limnology. Schweiz. Z. Hydrol. 37:53-84. (Cited in Wetzel 2001) Wetzel, R. G. and G. E. Likens. 1991. Limnological Analyses. 3 rd Edition. Springer- Verlag, New York. 391 pp. Wetzel, R.G. 1983. Limnology 2 nd ed. W.B. Saunders Co. Philadelphia, Pa. 860 pp. Wetzel, R.G. 2001. Limnology. Lake and River Ecosystems, Third Edition. Academic Press. San Diego. 1006 pp. BC Hydro Page 40
Stave River Water Use Plan Monitoring Terms of Reference June 13, 2005 1.0 Program Rationale 1.1 Background 3. Fish Biomass Assessment Early in the WUP process, the consultative committee (CC) identified the need to improve the fish production of Stave and Hayward Lake reservoirs as a key objective of the process. The capability to measure fish production under current conditions, as well as the ability to forecast productivity changes as a result of changes in reservoir operations, was beyond the scope of the WUP project. As a result, indicator variables had to be used instead for decision-making purposes. Use of these indicators, in this case the effective littoral zone (ELZ) and carbon-based productivity performance measures (PMs), required that they be directly related to measures of fish productivity or fish biomass. The causal relationship however, could not be verified at the time of the WUP and therefore, had to be assumed when the PMs. The CC recognised that there was considerable uncertainty in this assumed relationship. So when the CC reached consensus to accept Combo 6 as the preferred WUP operating strategy, they recommended that a monitoring program be implemented to verify the assumed correlation between the PMs used for decision–making and empirical measures of fish biomass (Failing 1999). Based on the PM modelling results, the Combo 6 operating strategy is expected to increase in fish biomass as a result of increased littoral productivity (as measured by the ELZ PM) due to greater stability in reservoir water levels (Failing 1999). This monitor is designed to test the likelihood that this increase in overall fish biomass does indeed occur. 1.2 Management Questions An overall increase in fish biomass was one of the key motivations of the CC to select operational alternatives that tend to add some degree of stability to reservoir water levels. Fish biomass however, could not be measured at the time of the WUP process, nor could it be modelled with certainty. To proceed with the WUP, the CC assumed that there was a causal relationship between littoral and pelagic productivity, as indicated by performance measures of primary productivity, and fish biomass. Though such a relationship is theoretically sound the extent with which fish populations respond to incremental changes in littoral or pelagic development is unknown. Initially, the CC explored strategies that explicitly constrain the reservoir to minimise fluctuation. However, because of this uncertainty in fish response to changes in productivity PM, as well as the high costs of such strategies, the CC decided to abandon pursuit of strategies that actively constrain the reservoir until further information is gathered. Nevertheless, the CC continued to use the assumed relationship in their decisionmaking processes, which in part lead to the consensus decision to adopt Combo 6 as the preferred operation. The Combo 6 strategy provided the greatest degree of Stave reservoir stability without necessarily imposing reservoir constraints (i.e., the stability BC Hydro Page 41
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Stave River Water Use Plan - BC Hydro

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