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Last modified
7/14/2009 5:02:37 PM
Creation date
5/22/2009 6:55:58 PM
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UCREFRP
UCREFRP Catalog Number
9686
Author
Flathead Lake Biological Station.
Title
FISORS III Fifth International Symposium On Regulated Streams.
USFW Year
1991.
USFW - Doc Type
Polson, MT.
Copyright Material
NO
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Modelling in Regulated River Research and Management <br />RIVER SYSTEM MODEL FOR QUANTIFYING SALMON PRE-SMOLT PRODUCTION IN THE TRINITY <br />RIVER OF CALIFORNIA. S.C. Williamson, J.M. Bartholow, and C.B. Stalnaker, U.S. <br />Fish and Wildlife Service, 4512 McMurry Avenue, Fort Collins, CO 80525-3400. <br />The Instream Flow Incremental Methodology assumes that flow-dependent physical habitat and <br />water temperature modify (either increase or limit) the carrying capacity of streams for <br />fish. This study focuses on making flow:habitat:fish production hypotheses, attempting to <br />reject those hypotheses in different riverine ecosystems, and developing river regulation- <br />fish production concepts. As part of the Trinity River flow evaluation and habitat <br />restoration program, we are helping to answer the questions: how much change in fish <br />production would result from a different annual allocation (i.e., up or down from the <br />230,000 acre-feet released in dry years); and how much change in fish production would <br />result from a different release pattern within a fish life-history year (i.e., up or down <br />in different months from the 300 cubic feet per second year-round releases in dry years). <br />We intend to: quantitatively test hypotheses (as expressed by local river system experts) <br />that physical habitat and water temperature constraints have on movement (including <br />migration), growth, and mortality rates of salmonid fishes; identify constraints during a <br />particular fish life-history year in descending order of severity of the impacts; and <br />demonstrate how salmonid population and production data along with modified reservoir <br />management objectives can be used in reservoir operations and planning for multiple use <br />optimization. The river system model will demonstrate how to: remove severe streamflow- <br />related physical habitat and water temperature constraints; optimally manage an annual <br />fishery water allocation (budget) and seasonal release pattern for fish production; and <br />stay within the limits of available reservoir storage with hedging of risks for subsequent <br />dry years. This model will provide the opportunity to efficiently manage water budgets for <br />optimal fish production as opposed to handling instream flows as an operational constraint. <br />THE FORESTED CORRIDOR OF THE LOWER MISSISSIPPI RIVER. Charles V. Klimas, US <br />Army Engineer Waterways Experiment Station, Vicksburg, MS, USA 39180. <br />The Lower Mississippi River winds nearly a thousand miles from the confluence with the <br />Ohio River to the Gulf of Mexico. Prior to European settlement, the lower valley supported <br />about 24 million acres of diverse bottomland hardwood forests, which provided habitat for <br />a great variety of resident and migratory wildlife. A comprehensive program of flood con- <br />trol, drainage, and agricultural development have reduced this resource to less than five <br />million forested acres. Most of the remaining forests within the alluvial valley are in <br />small, scattered tracts. However, within the levee system flanking the river there are <br />more than a million acres of bottomland forest arrayed as a single continuous corridor span- <br />ning the length of the valley. The corridor is largely isolated within an agricultural <br />landscape, with few connections to other forested ecosystems. It is subject to modified <br />hydrologic and sedimentation regimes, dynamic channel migration processes have been <br />arrested, and the forests have a long history of selective timber exploitation. These <br />and other factors have produced a corridor that is functionally limited, and cannot provide <br />the full range of wildlife habitat values traditionally associated with bottomland hard- <br />woods. The various pressures on the system and limitations on recovery potential suggest <br />that the resource is likely to degrade further in the future. This paper, based on exten- <br />sive field studies, describes the characteristics of the forests and physical and biotic <br />factors limiting forest function, and includes suggestions regarding the design and <br />management of riparian corridors. <br />18 <br />
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