DOCSLIB.ORG

Cumulative Effects of Hydropower Schemes on Fish Migration and Populations

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Cumulative Effects of Hydropower Schemes on Fish Migration and Populations Cumulative effects of hydropower schemes on fish migration and populations Report – SC120078 We are the Environment Agency. We protect and improve the environment and make it a better place for people and wildlife. We operate at the place where environmental change has its greatest impact on people’s lives. We reduce the risks to people and properties from flooding; make sure there is enough water for people and wildlife; protect and improve air, land and water quality and apply the environmental standards within which industry can operate. Acting to reduce climate change and helping people and wildlife adapt to its consequences are at the heart of all that we do. We cannot do this alone. We work closely with a wide range of partners including government, business, local authorities, other agencies, civil society groups and the communities we serve. This report is the result of research commissioned and funded by the Environment Agency. Published by: Author(s): Environment Agency, Horizon House, Deanery Road, Dr David Fraser, Simon Palmer & Dr Iain Stewart- Bristol, BS1 5AH Russon www.environment-agency.gov.uk Dissemination Status: Released to Regions ISBN: 978-1-84911-336-6 Publicly available © Environment Agency – January 2015 Keywords: Hydropower; Cumulative effects; Impacts; Barrier; Fish All rights reserved. This document may be reproduced Passage; Conservation limit; Migratory; Anadromous; with prior permission of the Environment Agency. Catadromous; Diadromous The views and statements expressed in this report are Research Contractor: those of the author alone. The views or statements APEM Ltd, Centre for Innovation & Enterprise expressed in this publication do not necessarily Oxford University represent the views of the Environment Agency and the Begbroke Science Park, Begbroke Hill Environment Agency cannot accept any responsibility for Woodstock Road such views or statements. Begbroke, OX5 1PF Tel: 01865 854 853 Further copies of this report are available from our publications catalogue: Environment Agency’s Project Manager: www.gov.uk/government/publications Stephanie Cole, Evidence Directorate or our National Customer Contact Centre: Project Number: T: 03708 506506 SC120078/R1 Email: [email protected] ii Cumulative effects of hydropower schemes on fish migration and populations Evidence at the Environment Agency Evidence underpins the work of the Environment Agency. It provides an up-to-date understanding of the world about us, helps us to develop tools and techniques to monitor and manage our environment as efficiently and effectively as possible. It also helps us to understand how the environment is changing and to identify what the future pressures may be. The work of the Environment Agency’s Evidence Directorate is a key ingredient in the partnership between research, guidance and operations that enables the Environment Agency to protect and restore our environment. This report was produced by the Scientific and Evidence Services team within Evidence. The team focuses on four main areas of activity: • Setting the agenda, by providing the evidence for decisions; • Maintaining scientific credibility, by ensuring that our programmes and projects are fit for purpose and executed according to international standards; • Carrying out research, either by contracting it out to research organisations and consultancies or by doing it ourselves; • Delivering information, advice, tools and techniques, by making appropriate products available. Miranda Kavanagh Director of Evidence Cumulative effects of hydropower schemes on fish migration and populations iii Executive summary Guidance for run-of-river hydropower schemes in England is designed to minimise environmental impacts. This report describes an investigation into whether small impacts from single sites, compounded across multiple schemes within a catchment, cumulatively produce significant adverse impacts. We use salmon as an example to illustrate whether cumulative effects on migratory fish populations can be assessed and whether they are likely to occur. The literature review indicated that multiple hydropower schemes have the potential to result in negative cumulative impacts but most of the available evidence is from much larger schemes in other countries not typical of schemes being developed in England. The literature does indicate the main aspects of hydropower schemes that may affect fish populations and these informed the development of a cumulative effects model. The model was applied to a test catchment, the River Coquet, to explore a range of hypothetical scenarios around the installation of hydropower schemes. Critically, hydropower schemes, which include mitigating measures such as an associated fish pass, can have a positive, neutral or negative effect, depending on scheme design and location. Consequently, whether multiple schemes have cumulative effects, and whether such effects are negative, neutral or positive, depends on the net effects from each individual scheme, considered collectively across all schemes. Such an approach is necessarily sensitive to the accuracy with which individual site effects can be quantified. To model cumulative effects, three model elements were used: (i) hydropower scheme impacts, (ii) spatial variations in the fish population and (iii) changes in the fish life-cycle. The hydropower scheme element identifies impacts of run-of-river hydropower schemes based on their importance in terms of migratory fish, and the likelihood of being able to quantify them. Impacts included were: • impediment to upstream and downstream migration from the scheme; • alleviation of upstream and downstream migratory impediment with fish passage solutions; • mortality through impingement or entrainment of fish on scheme intakes and through contact with turbines; • an option to include freshwater habitat loss as a result of the scheme (via any depleted on inaccessible reach). A range of sources were used to attribute values to model components. These included available guidance, literature and scientific judgement. The spatial population model element, developed using salmon as a demonstration species, uses the Environment Agency’s Detailed River Network, combined with generic, scientifically accepted juvenile salmon population values. The scheme effects element, reflecting hypothetical hydropower schemes, was then applied to the spatial population element. This enabled the salmon population upstream of the scheme, and (via the life-cycle model element) returning adults requiring passage past the scheme, to be quantified, and benefits and dis-benefits from the schemes to be applied to the population. Some factors that may be important but will be highly site specific (e.g. increased predation) or changes in flow apportionment between a turbine and a fish pass can be added if required but were not used in this study. The sequential evaluation of multiple schemes in this way allowed assessment of cumulative effects. Overall effects were quantified as the change in the numbers of returning adult salmon. iv Cumulative effects of hydropower schemes on fish migration and populations Within the River Coquet test catchment a theoretical maximum population of salmon was defined; this took no account of other pressures that might be operating within the catchment. The aim of the work was specifically to address impacts from hydropower. A range of scenarios considered the impacts of installing between one and six hydropower schemes; these are realistic but hypothetical situations designed to test the model. We show that the impact of each scheme and the cumulative effects of several schemes could be either positive or negative, with impacts on the number of returning adult fish ranging from +18% to -12% for the range of scenarios tested. The scenario testing assumed that values for upstream passage from new mitigation measures such as fish passes would meet Environment Agency guidance, which aims for greater than 90% efficiencies. Whether such efficiencies are achieved in practice may depend on site-specific conditions and design implementation. We included a scenario to illustrate the effect of a scheme operating below best practice passage efficiency levels. Impacts are highly dependent on the pre-scheme passability of existing barriers and any benefit achieved by mitigating measures such as improved fish passage. Other significant factors include the location of schemes and the amount of potential upstream habitat affected. In this analysis schemes located in the upper catchment have less potential for negative impacts, but in the case of the test scenarios a large improvement in fish passage at an existing barrier in the lower catchment created very significant improvements that more than compensated for some negative scheme impacts upstream. Such improvements could also be made without the installation of hydropower and the model facilitates evaluation of such options. The status of catchment populations would also influence the resulting impacts of schemes on salmon populations. The model was developed based on the biological values used for deriving salmon conservation limits and, thus, is scientifically robust, familiar to fisheries practitioners, and transferable (in principle) to other migratory species and rivers. However, a significant advantage is that, unlike conventional conservation limits, which are essentially static and do not allow spatial interrogation, the GIS format of the current spatial model enables the number
Load more

Recommended publications
  • Flooding the Border: Development, Politics, and Environmental Controversy in the Canadian-U.S
    FLOODING THE BORDER: DEVELOPMENT, POLITICS, AND ENVIRONMENTAL CONTROVERSY IN THE CANADIAN-U.S. SKAGIT VALLEY by Philip Van Huizen A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in The Faculty of Graduate Studies (History) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) June 2013 © Philip Van Huizen, 2013 Abstract This dissertation is a case study of the 1926 to 1984 High Ross Dam Controversy, one of the longest cross-border disputes between Canada and the United States. The controversy can be divided into two parts. The first, which lasted until the early 1960s, revolved around Seattle’s attempts to build the High Ross Dam and flood nearly twenty kilometres into British Columbia’s Skagit River Valley. British Columbia favoured Seattle’s plan but competing priorities repeatedly delayed the province’s agreement. The city was forced to build a lower, 540-foot version of the Ross Dam instead, to the immense frustration of Seattle officials. British Columbia eventually agreed to let Seattle raise the Ross Dam by 122.5 feet in 1967. Following the agreement, however, activists from Vancouver and Seattle, joined later by the Upper Skagit, Sauk-Suiattle, and Swinomish Tribal Communities in Washington, organized a massive environmental protest against the plan, causing a second phase of controversy that lasted into the 1980s. Canadian and U.S. diplomats and politicians finally resolved the dispute with the 1984 Skagit River Treaty. British Columbia agreed to sell Seattle power produced in other areas of the province, which, ironically, required raising a different dam on the Pend d’Oreille River in exchange for not raising the Ross Dam.
    [Show full text]
  • Nuclear Power for Vancouver Island
    NUCLEAR POWER FOR VANCOUVER ISLAND i •• • .. •. ;^ ; At the requc Canada limited generation of m NUCLEAR POWER FOR VANCOUVER ISLAND At the request of the Greater Nanaimo Chamber of Commerce, Atomic Energy of Canada Limited has been most happy to prepare these notes on many aspects of the generation of nuclear power on Vancouver Island. The 23 topics are as listed in the letter of Mr. David D. Hart, President of the Chamber, which is reproduced herewith. ; Our study shows that Vancouver Island is a logical area for the application of nuclear power. - . • We would be glad to try to answer any questions arising from these notes, or to refer . those interested to AECL or other publications giving more detailed information on specific subjects. •- - Ji. Gray President Atomic Energy of Canada Limited, • - ,275 Slater Street, . ; , - Ottawa; Ontario . ' -'-.,',' Í K1A0S4 , ,'•'••• • ? fii 2nd edition Covtr photo show« th« Douglw Point N,icl»ar Ganaiiting Station which i« part of tha Bruca Nuclaar Pcwyar Daválopmant on Laka - Huron.-' ,•'*•• '• " ~•-, > . ° I • ".'. ,,\ % INDEX List of Illustrations 2 Summary 3 Explanatory Notes and Abbreviations 4 How a Nuclear Plant Works .: 5 Letter from Mr. David D. Hart 8 Topics Suggested by Greater Nanaimo Chamber of Commerce 9 ILLUSTRATIONS i i;i Fig. No. Page I ii 1 Comparison of Nuclear with Conventional Power 5 I 2 Flow diagram of Nuclear Power Plant 5 !| 3, 540 MW Turbo-Generator. 5 I - 4 Pickering Nuclear Generating Station 6 )| , 5 Douglas Point Nuclear Generating Station 6 if 6 . Map showing Canadian Atomic Energy Establishments 7 I •-"-"• p. 7 Burrard Thermal Generating Plant 7 I 8 Ontario Hydro's Nuclear Training Centre for Operators 15 9 NPD Generating Station • • • I6 -' ' 10 Effects of Inflation on Power Costs 18 11 Fuel Bundle;.
    [Show full text]
  • Vancouver, B.C. May 11, 1976 Volume 50
    MACKENZIE VALLEY PIPELINE INQUIRY IN THE MATTER OF THE APPLICATIONS BY EACH OF (a) CANADIAN ARCTIC GAS PIPELINE LIMITED FOR A RIGHT-OF-WAY THAT MIGHT BE GRANTED ACROSS CROWN LANDS WITHIN THE YUKON TERRITORY AND THE NORTHWEST TERRITORIES, and (b) FOOTHILLS PIPE LINES LTD. FOR A RIGHT-OF-WAY THAT MIGHT BE GRANTED ACROSS CROWN LANDS WITHIN THE NORTHWEST TERRITORIES FOR THE PURPOSE OF A PROPOSED MACKENZIE VALLEY PIPELINE and IN THE MATTER OF THE SOCIAL, ENVIRONMENTAL AND ECONOMIC IMPACT REGIONALLY OF THE CONSTRUCTION, OPERATION AND SUBSEQUENT ABANDONMENT OF THE ABOVE PROPOSED PIPELINE (Before the Honourable Mr. Justice Berger, Commissioner) Vancouver, B.C. May 11, 1976 PROCEEDINGS AT COMMUNITY HEARING Volume 50 The 2003 electronic version prepared from the original transcripts by Allwest Reporting Ltd. Vancouver, B.C. V6B 3A7 Canada Ph: 604-683-4774 Fax: 604-683-9378 www.allwestbc.com APPEARANCES Mr. Ian G. Scott, Q.C. Mr. Ian Waddell, and Mr. Ian Roland for Mackenzie Valley Pipeline Inquiry Mr. Piere Genest, Q.C. and Mr. Darryl Carter, for Canadian Arctic Gas Pipeline Lim- ited; Mr. Alan Hollingworth and Mr. John W. Lutes for Foothills Pipe- lines Ltd.; Mr. Russell Anthony and pro. Alastair Lucas for Canadian Arctic Resources Committee Mr. Glen Bell, for Northwest Territo- ries Indian Brotherhood, and Metis Association of the Northwest Territories. INDEX Page WITNESSES: Gilbert COOK, Steve CARPENTER, Lonnie HINDLE 4853 Daniel O'BRIEN 4854 Peter B. HOLMES 4860 Bernard GILLIE and Mrs. Mavis GILLIE 4864 Douglas DOBYNS 4874 Rev. Jack SHAVER and Rev. Art ANDERSON 4880 Richard STACE-SMITH 4885 Philip PAUL 4897 John DALY 4904 John LITTLEDALE 4908 Douglas PIMLOTT 4911 Miss Celia KOVAL 4915 Harry BURROW, Joan ST.
    [Show full text]
  • A Review of Literature Related to Movements of Adult Salmon and Steelhead Past Dams and Through Reservoirs in the Lower Snake River
    i'i US Army Corps of Engineers Walla Walla District A Review of Literature Related to Movements of Adult Salmon and Steelhead Past Dams and Through Reservoirs in the Lower Snake River T.C. Bjornn and C.A. Peery U.S. Fish and Wildlife Service Idaho Cooperative Fish and Wildlife Research Unit 19970403 014 October 1992 mm QUAIIST? rsagwEBD i Technical Report 92-1 A REVIEW OF LITERATURE RELATED TO MOVEMENTS OF ADULT SALMON AND STEELHEAD PAST DAMS AND THROUGH RESERVOIRS IN THE LOWER SNAKE RIVER T.C. Bjornn and C.A. Peery U.S. Fish and Wildlife Service Idaho Cooperative Fish and Wildlife Research Unit University of Idaho, Moscow, Idaho 83843 for U.S. Army Corps of Engineers Walla Walla District April 1992 Table of Contents Abstract Introduction 1 Study Area and Fish of Concern 1 Factors Influencing Migrations 5 Migration in Natural Rivers 7 Migration Past Dams ■) 5 Entry Into Fishways 16 Tailrace flow patterns 17 Powerhouse discharges 18 Power peaking 20 Spillway discharge patterns 21 Fishway entrances 24 Migration Through Fishways 25 Passage Through the Navigation Locks 30 Fallback At Dams 30 Migration In Reservoirs 38 Flows 42 Temperatures 44 Turbidity 44 Nitrogen Supersaturation 45 Other Factors 46 "Losses" During Migration 48 Discussion 5-) Literature Cited 55 Additional Related Literature 67 Abstract A synthesis of published and unpublished literature on the upstream migration of adult salmon and steelhead Oncorhynchus mykiss, with particular reference to passage through reservoirs and over dams, was prepared as part of an evaluation of fish passage through the lower Snake River. Most of the information on adult migrations in the Snake and Columbia rivers was collected on chinook salmon O.
    [Show full text]
  • Historic Steelhead Abundance
    Part III. Historic Steelhead Abundance Conclusion In the attempt to piece together a history of Hoh River steelhead, it has been necessary to examine the steelhead histories of neighboring river basins of the Olympic Peninsula – the Queets, Quileute, and Quinault – as well as Puget Sound and the Stillaguamish River, in order to collect enough data to develop a regional pattern that can help to fill in the many historic blanks. The history of the harvest of sea otters was also examined. Sea otters provide the example of an animal whose original North Pacific Rim range was nearly identical to that of steelhead, whose abundance was great, and whose near extinction was strictly that of overharvest with little compromise of habitat at the time. And lastly, the example of Alaska's Situk River is examined where a steelhead population was targeted for purposeful eradication, went into great depletion, and then through management changes has made considerable progress toward steelhead recovery. The combined comparisons of these steelhead histories found there was a general pattern of great steelhead depletion that has occurred with steady progression over the past 80 to 120 years since the advent of industrial level fish harvests whose motivation was strictly immediate profit as the culmination to a human cultural/economic shift that occurred on the West Coast of North America. In some cases wild steelhead populations were targeted for harvest by the varied economic interest groups, in others they were incidentally harvested, and in at least one case wild steelhead were a perceived threat to those economic interests and were targeted instead for eradication.
    [Show full text]
  • Matrix Analytic Methods with Markov Decision Processes for Hydrological Applications
    MATRIX ANALYTIC METHODS WITH MARKOV DECISION PROCESSES FOR HYDROLOGICAL APPLICATIONS Aiden James Fisher December 2014 Thesis submitted for the degree of Doctor of Philosophy in the School of Mathematical Sciences at The University of Adelaide ÕÎêË@ ø@ QK. Acknowledgments I would like to acknowledge the help and support of various people for all the years I was working on this thesis. My supervisors David Green and Andrew Metcalfe for all the work they did mentoring me through out the process of researching, developing and writing this thesis. The countless hours they have spent reading my work and giving me valuable feedback, for supporting me to go to conferences, giving me paid work to support myself, and most importantly, agreeing to take me on as a PhD candidate in the first place. The School of Mathematical Sciences for giving me a scholarship and support for many years. I would especially like to thank all the office staff, Di, Jan, Stephanie, Angela, Cheryl, Christine, Renee, Aleksandra, Sarah, Rachael and Hannah, for all their help with organising offices, workspaces, computers, casual work, payments, the postgraduate workshop, conference travel, or just for having a coffee and a chat. You all do a great job and don't get the recognition you all deserve. All of my fellow postgraduates. In my time as a PhD student I would have shared offices with over 20 postgraduates, but my favourite will always be the \classic line" of G23: Rongmin Lu, Brian Webby, and Jessica Kasza. I would also like to give special thanks to Nick Crouch, Kelli Francis-Staite, Alexander Hanysz, Ross McNaughtan, Susana Soto Rojo, my brot´eg´eStephen Wade, and my guide to postgraduate life Jason Whyte, for being my friends all these years.
    [Show full text]
  • Annual Report 1976
    INTERNATIONAL PACIFIC SALMON F I S H E R I E S C o-M M I S S I O N APPOINTED UNDER A CONVENTION BETWEEN CANADA AND THE UNITED STATES FOR THE PROTECTION, PRESERVATION AND EXTENSION OF THE SOCKEYE AND PINK SALMON FISHERIES IN THE FRASER RIVER SYSTEM ANNUAL REPORT 1976 COMMISSIONERS DONALD R. JOHNSON W.R. HOURSTON WILLIAM G. SALETIC RICHARD NELSON DONALD W. MOOS RODERICK HAIG-BROWN NEW WESTMINSTER CANADA 1977 INTERNATIONAL PACIFIC SALMON FISHERIES COMMISSION MEMBERS AND PERIOD OF SERVICE SINCE THE INCEPTION OF THE COMMISSION IN 1937 CANADA UNITED STATES William A. Found ........................... 1937-1939 Edward W. Allen ............................ 1937-1951 1957-1957 A. L. Hager ..................................... 1937-1948 B. M. Brennan ................................ 1937-1942 Senator Thomas Reid .................... 1937-1967 Charles E. Jackson ........................ 1937-1946 A. J. Whitmore ............................... 1939-1966 1968-1969 Fred J. Foster ................................. 1943-1947 Olof Hanson ................................... 1948-1952 Milo Moore .................................... 1946-1949 1957-1961 H. R. MacMillan, C.B.E., D.Sc .... 1952-1956 Albert M. Day ................................. 1947-1954 F. D. Mathers ................................. 1956-1960 Alvin Anderson ............................... 1949-1950 W.R. Hourston .............................. 1960- Robert J. Schoettler ...................... 1951-1957 Richard Nelson .............................. 1966-1976 Elton B. Jones ...............................
    [Show full text]
  • Proceedings of the 1972 Northeast Pacific Pink Salmon Workshop
    INFORMATIONAL LEAFLET NO. 161 PROCEED INGS OF THE 1972 NORTHEAST PAC IF IC PINK SAWON WORKSHOP Edited by: Jack E. Bailey Rapporteur - 1972 Pink Salmon Workshop National Marine Fisheries Service STATE OF ALASKA WILLIAM A. EGAN - GOVERNOR DEPARTMENT OF FISH AND GAME SUBPORT BUILDING, JUNEAU 99801 December 1972 PROCEEDINGS OF THE 1972 NORTHEAST PACIFIC PINK SALMON WORKSHOP The abstracts and talks reproduced in this report are not to be treated as published material and any reference to their contents should be approved by the author and cited as a personal communication. Edited by: Jack E . Bailey Rapporteur - 1972 Pink Salmon Workshop National Marine Fisheries Service P. 0. Box 155 Auke Bay, Alaska 99821 FOREWORD The Northeast Pacific Pink Salmon Workshops have been held biennially since 1962. The purpose of the workshops is to encourage exchange of ideas, criticisms , questions and suggestions . It is the intent that participants and respective agencies will receive maximum benefit from the meetings through the continuous correspondence long after the adjournment of the workshop. To this end, we have liberally reproduced all material made available by the panel speakers. In addition, we have added one discussion which we believe is of interest to you who attended the workshop. Panel topics were selected from a list of six suggested by the 1970 steering committee. For the first time since the inception of the workshops, two full panels were devoted to artificial propagation and multiple use of watersheds. That these topics are of major importance in the salmon industry is a matter of public record. Perhaps the 1974 steering committee will con- sider a full day devoted to environmental concerns.
    [Show full text]
  • Potential Effects of Dams on Migratory Fish in the Mekong River: Lessons from Salmon in the Fraser and Columbia Rivers
    Environmental Management (2011) 47:141–159 DOI 10.1007/s00267-010-9563-6 Potential Effects of Dams on Migratory Fish in the Mekong River: Lessons from Salmon in the Fraser and Columbia Rivers John W. Ferguson • Michael Healey • Patrick Dugan • Chris Barlow Received: 17 September 2009 / Accepted: 2 September 2010 / Published online: 6 October 2010 Ó Springer Science+Business Media, LLC (outside the USA) 2010 Abstract We compared the effects of water resource mainstem dams. Minimizing impacts will require decades development on migratory fish in two North American to design specialized fish passage facilities, dam opera- rivers using a descriptive approach based on four high- tions, and artificial production, and is complicated by the level indicators: (1) trends in abundance of Pacific salmon, Mekong’s high diversity and productivity. Prompt action is (2) reliance on artificial production to maintain fisheries, needed by governments and fisheries managers to plan (3) proportion of adult salmon that are wild- versus Mekong water resource development wisely to prevent hatchery-origin, and (4) number of salmon populations impacts to the world’s most productive inland fisheries, and needing federal protection to avoid extinction. The two food security and employment opportunities for millions of rivers had similar biological and physical features but people in the region. radically different levels of water resource development: the Fraser River has few dams and all are located in trib- Keywords Dams Á Migratory fish Á Fish passage Á utaries, whereas the Columbia River has more than 130 Mitigation Á Fisheries large mainstem and tributary dams. Not surprisingly, we found substantial effects of development on salmon in the Columbia River.
    [Show full text]
  • Its, the Biological and Technical Justification for the Flow Proposal Of
    Its, Er .11,31 The Biological and Technical Justification for the Flow Proposal of the Columbia Basin Fish and Wildlife Authority Prepared jointly by the members of the Columbia Basin Fish and Wildlife Authority 2501 S.W. First Ave., Suite 200 Portland, Oregon 97201-4752 February, 1991 The Biological and Technical Justification for the Flow Proposal of the Columbia Basin Fish and Wildlife Authority Prepared jointly by the members of the Columbia Basin Fish and Wildlife Authoritv 2501 S.W. First Ave., Suite 200 Portland, Oregon 97201-4752 Februarv, 1991 TABLE OF CONTENTS LIST OF FIGURES LIST OF TABLES .................. V SUMMARY ............. .................................................. vi 1. BACKGROUND I A. Introduction 1 B. Historical Perspective 2 ..................................... ................. II. IDENTIFICATION OF THE NEED FOR FLOW 8 A- Juvenile Salmonids 8 1. Migratory Behavior 9 a. Biology ...................................................... 9 b. Control ............................................................ of Migratory Behavior 10 .......... .... .................... 2. Physiological Development @ ............................................... 12 a. Delay and Residualism 13 b. ............................................... Salinity Preference and Tolerance 15 c. "Windows" BioloQical ....................................... of Timeliness and Their Management Implications 16 ........... 3. Predation Losses and Flow 18 a. Time ............................................... Residence Effects on Predation Losses
    [Show full text]
  • Natural Climate Insurance for Pacific Northwest Salmon and Salmon Fisheries: Finding Our Way Through the Entangled Bank
    knudsen.qxp 5/27/2004 2:11 PM Page 121 American Fisheries Society Symposium 43:xx–xx, 2004 © 2004 by the American Fisheries Society Natural Climate Insurance for Pacific Northwest Salmon and Salmon Fisheries: Finding Our Way through the Entangled Bank NATHAN MANTUA1 University of Washington Joint Institute for the Study of the Atmosphere and Oceans/ School of Marine Affairs Climate Impacts Group, Box 354235 Seattle, Washington 98195-4235, USA ROBERT C. FRANCIS2 University of Washington, School of Aquatic and Fisheries Sciences, Box 355020, Seattle, Washington 8195-5020, USA Abstract.—This essay focuses on the linkages between climate (variability and change) and sustainable salmon management policies. We show the importance of climate in its effects on salmon production as well as how unpredictable these effects are. Our assessment leads us to conclude that the treatment of environmental uncertainty poses a fundamental conflict between the kind of policies that have been traditionally used in fishery management—basically command and control policies that assume predictability and assert engineering solutions to just one or a few aspects of highly complicated problems—and what the environmental variabil- ity dictates—policies that embrace environmental variability and uncertainty and acknowl- edge a lack of predictability for salmon ecosystems. In this regard, we conclude that three things need to happen in order to integrate climate information into sustainable salmon man- agement policies: 1. De-emphasize the role of preseason run-size predictions in management activities. 2. Emphasize preseason and in-season monitoring of both the resource and its environment. 3. Focus on strategies that minimize the importance of uncertain climate variability and change scenarios to increase the resilience of short and long-term planning decisions.
    [Show full text]
  • Annualreport1971.Pdf
    PROVINCE OF BRITISH COLUMBIA DEPARTMENT OP RECREATION AND CONSERVATION HON, \V. K. K1J?.RNAN, h1inistcr Ll.OYD BROOKS, Aclit1$ t>cplil)' /.1itlisltr REPORT OF THE Department of Recreation and Conservation containing Jht rtp(Jrts of tire GENERAL ADMINISTRATION, FISH AND WILDLIFE BRANCH, PROVINCIAL PARKS BRANCH, BRITISH COLUMBIA PROVINCIAL MUSEUM, At"-'D COMMERCIAL FISHERIES BRANCH Year E11ded December 3/ 1971 Printed by K. ~1. ~iAC()ON.1.U>, Priri;cr to O>C Ql,:ecn'&bf<»t Ex«elknt ~taje.sty lA ri.&ht or the PrcwiNe of British Columbia. 1'72 \ VICTORIA, BRITISH COLUMBIA, JUN!! 30, 1972 To Colonel tire llonourable JOHN R. NICHOLSON, P.C., O.B.E., Q.C., LL.D., Lieutenam-Govemor of tire Province of British Columbia. MAY IT PLEASE YOUR HONOUR: Herewith I beg respectfully to submit the Annual Report of the Department of Recreation and Conservation for the year ended December 31, 1971. W. K. KIERNAN MiniSter of Recreation and Conservation VICTORIA, BRITISH COLllMllIA, JUNE 29, 1972 The Ho11011rable W. K. Kiema11, Mi11ister of Recreatio11 aml Conservation. Sm: I have the honour to submit the Annual Report of the Department of Recreation and Conservation for the year ended December 31, 1971. LLOYD BROOKS Acti11g Depwy Mi11ister of Recreation a11d Conservation CONTENTS ,_ Introduction by the Acting Deputy Minister of Recreation and Conservation General Administration 9 Fish and Wildlife Branch 15 Provincial Parks Branch 63 . -----------------·------ British Columbia Provincial Museum 97 Commercial Fisheries Branch 125 I ") I ! I l.I. I li.•l Report of the Department of Recreation and Conservation, 1971 LLOYD BROOKS, ACTll<O DBPUTY MINISTER ANO CoMMISSIONER OF FISHERlllS Th"TRODUCTIO ' The increased emphasis on 311 in1egxatcd approach 10 resources management throughout the Province, and the general concern over environmental quality by citizens, by industry, and by related resource agencies, Federal nod Provincial, bas added a new and demanding dimension to the work o( this Department.
    [Show full text]