By William C. Ackermann, Gilbert F. White, E. B. Worthington, J. Loreena Ivens
Papers awarded on the foreign Symposium on Man-made Lakes: their difficulties and environmental results held in Knoxville, Tennessee, could 3-7, 1971.
summary: Papers provided on the overseas Symposium on Man-made Lakes: their difficulties and environmental results held in Knoxville, Tennessee, may possibly 3-7, 1971
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Extra resources for Man-made lakes : their problems and environmental effects
Since the new fishery cannot begin to be managed scientifically without the recording of the catch and monitoring of its biological condition along with that of the stock in the lake, costs incurred in these operations must also be charged against development of the fisheries. Whereas the actual and potential values for production may be estimated with relative ease in many rivers, techniques for prediction of yield from large stabilized reservoirs are far from perfect. As was previously indicated, predictions are being made with practical success in some areas by two methods: (1) comparison with known catch in existing bodies of water judged to be similar to the one that may be created and (2) application of morphoedaphic indices and multiple regressions based on combinations of selected physical and chemical characteristics of the lake and its basin, including amounts of dissolved electrolytes in the water and preliminary estimates of primary and secondary production and biomass.
Special problems are created when a river system is developed with a series of dams. The effects of delays on both adults and juveniles are accumulated. Additionally, as the fish pass either upstream or downstream, there is a progressive deterioration of their ability to cope with additional stresses. Many of these effects are as yet not well understood, but there is substantial evidence that the total effects of a series of dams are more than the sum of their potential individual effects. It is thus apparent that, where a very large dam is to be built or where a series of small dams is to be constructed, one cannot be optimistic about the economic conservation of migratory fish.
Most of the rapid ecological changes started by Copyright American Geophysical Union Geophysical Monograph Series Man-made Lakes: Their Problems and Environmental Effects 22 SUMMARY AND RECOMMENDATIONS filling continue while the new lake is stabilizing. During the stabilization process, lake evolution is irregular in speed and direction; after stabilization, future change is slowed and is usually overall in a predictable direction. Knowledge of the processes of the telescoped evolution in the early history of the lake can be of great value for predicting eventual production.
Man-made lakes : their problems and environmental effects by William C. Ackermann, Gilbert F. White, E. B. Worthington, J. Loreena Ivens