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Ross, Ben Paul (2000) Manipulation of the Feeding Behaviour of Diving Ducks on Mussel Farms

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Ross, Ben Paul (2000) Manipulation of the Feeding Behaviour of Diving Ducks on Mussel Farms Ross, Ben Paul (2000) Manipulation of the feeding behaviour of diving ducks on mussel farms. PhD thesis. http://theses.gla.ac.uk/79002 Copyright and moral rights for this thesis are retained by the author A copy can be downloaded for personal non-commercial research or study, without prior permission or charge This thesis cannot be reproduced or quoted extensively from without first obtaining permission in writing from the Author The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the Author When referring to this work, full bibliographic details including the author, title, awarding institution and date of the thesis must be given Glasgow Theses Service http://theses.gla.ac.uk/ [email protected] MANIPULATION OF THE FEEDING BEHAVIOUR OF DIVING DUCKS ON MUSSEL FARMS Ben Paul Ross Presentedin candidaturefor the degreeof Doctor of Philosophy,to the Faculty of Science,University of Glasgow.February 2000. P. I declare that the work recorded in this thesis is entirely my own, unless otherwise stated,and that it is of my own composition.No part of this work has beensubmitted for any other degree. Ben Ross February2000 P. Acknowledgments This project was funded by the NERC LINK-Aquaculture initiative. I am grateful for the supervision of Bob Furness for this project. Bob's help and advice have been invaluable, particularly after the ducks were thoughtful enoughto put the Loch Striven musselfarm out of business,and things weren't looking too good. Mark Jamesand John Armstrong at Pitlochry also provided useful help. Integral to this study were all the mussel farmers, without whose help and valuable time I wouldn't have been able to do half of the work. Janet and Norrie, John Holmyard, Walter Spears,Graham Oxendaleand particularly Roger and Judy Thwaites were extremelykind and hospitablethroughout. Also lots of thanks to everyone who helped with the fortnightly counts, including Stuart Bearhop, Kenny Leung, Paul Burton, Rob Malsom, Scott Ramsey, Dave Stevens, Richard Mellanby, Steve Bright, Louise Rowe and Amanda Hooton (who put up with a lot of that sort of thing). Chris Waltho was invaluable in organising the Clyde eider counts, as were all the volunteers who braved often miserableconditions to surveythe eidersaround the west coast. I am also grateful to Nozrat Mirzai for his help in putting togetherthe UPS and laser. Kenny Ensor and June Freel also provided invaluable help. Thanks to all the other membersof the departmentstaff who were always willing to give up their time for me. Also within the department,the other postgradswho gave advice and generally made things bearable;-Stuart Bearhop (a mentor and Catry, P. tormentor), Brendan Godley, Annette Broderick, Paulo Kenny Leung, Steve Votier, Dave Stevens,Stuart Fleming, Jon Blount, Tom Sawyer, Mark Cook and all the rest. Particular thanks to my office mates; Kenny Leung, Helen Whittaker, Henriikka Clarkeburn,Andrea Fidgett, Mike Fowler and the now departedScott Ramsayand Matt Cottam,who have all put up with me and made me laugh at some point or other. Most of all I thank Jen for her ceaseless ability to keepmy sanityjust about intact during the last few months. A huge amount of gratitude goes out to all those who worked with me on fieldwork. Rob Malsorn and Paul Burton worked incredibly hard, putting up with me, outdoors, and all too often in sub-zero temperaturesand gale-force winds. Despite the fact that we faced two west coast winters in a caravan,we still managed to live like kings. Also 'big ups' to Scott Ramsay, and Rich Mellanby and Steve Bright (the mule and the scribe) for their help down in Loch Striven. Thanks again to Rob and Paul for taking me out into the hills wheneverwriting- up was taking its toll. Similar thanksto all the football gang on a Tuesdaynight, who have honed my predatory goalmouth skills to somewherefar short of perfection. Finally, a great big thanks to my Mum, Dad and Chris, who have been great throughout, and continueto keep me amused. Apologies if I have left anyoneout, my brain is not quite as good as it usedto be. p CONTENTS Summary I Chapter I General Introduction 4 Introduction 5 Mussel farming, diving ducks and reduction of losses 5 Aims and structureof thesis 9 References 10 Chapter 2 Eider population movements and distribution in 14 relation to aquaculture facilities Abstract 15 Introduction 16 Methods 18 Results 20 Discussion 25 References 29 Chapter 3 A comparison of the feeding behaviour of eiders 34 on natural musselbeds and at mussel farms Abstract 35 Introduction 36 Methods 37 Results 38 P. Discussion 44 References 47 Chapter 4 Quantifying the impact of diving ducks on the 52 productivity of mussel farms in Scotland Abstract 53 Introduction 54 Methods 55 Results 56 Discussion 63 References 67 Chapter 5 The effect of human activity and boat chasing on 72 the attendance and feeding of diving ducks at mussel farms Abstract 73 Introduction 74 Methods 75 Results 77 Discussion 80 References 83 Chapter 6 The use of laser light to reduce the impact of 85 diving ducks on mussel farms Abstract 86 Introduction 87 Methods 88 Results 91 Discussion 96 References 99 Chapter 7 The use of underwater playback to reduce the 104 impact of eiders on mussel farms p Abstract 105 introduction 106 Methods 107 Results 110 Discussion 117 References 119 Chapter 8 General Discussion 122 Appendix I Map of survey areas 129 Appendix H Questionnaire 130 Appendix IH Ross, B. P., & Furness,R. W. 2000. Minimizing the Back impact of diving ducks on mussel farming. Cover University of Glasgow, Glasgow. Summary 1. Eider numbersin the North Clyde arearemain quite constantthroughout the winter, with an influx of birds, mainly juveniles, in the late summer.These birds subsequentlydisappear from the area either as a result of increased mortality or by competitive exclusion by adult birds. Attendanceat a mussel farm in the areawas highest throughout the winter, and male to female sex- ratio was higher here than in other areas. Some breeding eiders from the North and West of Argyll move into the Clyde during the winter, but these represent only a small proportion of the wintering population. Eider wintering distribution can be influenced by aquaculturesites in some areas, although the effect on population growth is unclear. 2. The activity patterns of foraging eiders on natural mussel beds is strongly influenced by tidal height whereason mussel farms there is no such effect. In wild-feeding flocks, different areasare utilised at differing periods of the tidal cycle, perhapsas a method of keeping a uniform optimal dive-depth. Birds feeding on natural mussel beds dived on average three times as frequently as those feeding on mussel farms, and so clearly had to work harder to meet energyrequirements. 3.97% of Scottish mussel farmers contactedreported eiders as a pest species, and 21% also suffered damagefrom goldeneyes.Losses of stock to feeding eiders can be huge, and the fmancial cost considerable,averaging 14000 per farm per year (1994-1998).Attendance at farms tendedto peak during early spring and late autumn. Many damagelimitation measureswere employed p by farmers,with only one, netting, giving unambiguoussuccess. 4. Worker presence on mussel farms decreasedeider attendanceby 95%. Chasing the birds by boat significantly reduced numbers of feeding eiders and goldeneyesin the short-term,by 91 and 51% respectively. This effect was short-lived, particularly with goldeneyes.There was also evidenceto suggestthat disturbancelowers the subsequentfeeding rate of goldeneyes on musselfarms. 2 5. Laser fight significantly reducednumbers of diving ducks on mussel farms, however its efficacy is reducedas ambient fight levels increase.As a result, its use is often restricted to periods around sunrise and sunset. Different populations of eiders showed significantly different sensitivities to laser light. Sequentialtrials of the laser fight on adjacentfarms showedthat birds were initially scaredfrom one site to the next, but repeatedregimes moved birds out of the area. 6. Trials of an Underwater Playback System (UPS), replaying recordings of chase-boatengines, gave significant reductionsin eider numbersof 50-80%. A control trial with the playback of an unassociated noise gave no significant reduction in numbers.The meanreturn time of birds to the farm after chasing by boat also increasedsignificantly during UPS trials. The long-term habituation of ducks to this system was negligible with occasionalreinforcement by boat chasing. 7. On the basis of these scientific trials and observations,recommendations to mussel farmers are made in an advisory booklet (Appendix III). Netting designs are presentedand possible use of UPS or laser light on farms is reviewed. p 3 Chapter 1 General Introduction Chapter I- Generalintroduction Introduction This thesis is set out with the intention that each chapter can be read in isolation, with no need for cross-reference,and chaptersare thus presentedin a journal format. This general introductory chapter will outline the background information relevant to this study, beginning with a brief overview of the mussel farming industry. This is followed by brief descriptions of the ecology of the relevant ducks. Finally, the actual and potential interactions between the two will be discussed,and the aims and scopeof the project will be described. Mussel farming, diving ducks and reduction of losses There are two main methodsof mussel(Mytilus edulis) farming; bottom culture and suspendedculture on ropes. It is the latter that is generally practised in Scotland. Suspended culture has two main designs. Raft culture involves hanging a large number of the ropes,or droppersin a densegrid from a moored floating platform. Long-line farms consist of one or more long rope head-lines, supported by a series of large floats, from which the droppers are hung at regular intervals.
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