Water Vole Field Signs and Habitat Assessment: A Practical Guide to Water Vole Surveys
By Mike Dean
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About this ebook
Mike Dean
Mike Dean has worked as an ecological consultant since 1997, with roles in varying size consultancies from the very small (one or two staff members) to the very large multi-disciplinary consultancy, and a few in between. He’s undertaken ecological surveys and produced ecological reports of all different types and sizes. In 2013 he joined the Chartered Institute of Ecology and Environmental Management’s (CIEEM) Professional Standards Committee, tasked with producing guidelines on, amongst other things, ecological report writing. He’s been delivering training on report writing for CIEEM since 2015.
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Water Vole Field Signs and Habitat Assessment - Mike Dean
Water Vole Field Signs and Habitat Assessment
Water Vole Field Signs and Habitat Assessment
A PRACTICAL GUIDE TO WATER VOLE SURVEYS
Mike Dean
Pelagic Publishing | www.pelagicpublishing.com
Published by Pelagic Publishing
PO Box 874
Exeter
EX3 9BR
UK
www.pelagicpublishing.com
Water Vole Field Signs and Habitat Assessment: A Practical Guide to Water Vole Surveys
ISBN 978-1-78427-254-8 (Pbk)
ISBN 978-1-78427-255-5 (ePub)
ISBN 978-1-78427-256-2 (ePDF)
Copyright © 2021 Mike Dean
The moral rights of the author have been asserted.
All rights reserved. Apart from short excerpts for use in research or for reviews, no part of this document may be printed or reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, now known or hereafter invented or otherwise without prior permission from the publisher.
A CIP record for this book is available from the British Library
All photographs © Mike Dean unless otherwise stated.
Cover images: Main image: Water vole © Simon Booth Photography.
Other images (left to right): Optimal water vole habitat provided by the River Coln in Gloucestershire; water vole feeding remains; water vole burrow. All photos © Mike Dean.
Back cover images: Optimal water vole habitat provided by a drainage ditch in Kent © Mike Dean; water vole latrine © Mike Dean; water vole swimming © Jo Cartmell.
For Xander and Jessica
Contents
Acknowledgements
1. Introduction
A bit of background
Personal experience
Legal protection in the UK
Competence
2. Habitat
Where do you find water voles?
What does ‘ideal’ habitat for water voles look like?
Habitat requirements
Dry areas for burrows or above-ground nests
Herbaceous vegetation as food and cover
Water
How to assess likely value of habitat
Water voles in terrestrial habitat
3. What does a water vole look like?
4. Looking for field signs
Different field signs
When to search
Where to search
How to search
Other factors to consider
Health, safety and biosecurity
5. Droppings and latrines
Characteristics of water vole droppings
Latrines
How many droppings constitute a latrine?
What can latrines tell us?
Terrestrial, or fossorial, water voles
Rat droppings
Field vole and bank vole droppings
DNA analysis
6. Feeding remains
7. Burrows
Characteristics of ‘active’ water vole burrows
Burrows of similar species
Detailed examination of burrows
8. Nests
9. Other field signs
Footprints
Runs through the vegetation
10. Other species
Droppings
Footprints
11. Recording the information
What information needs to be recorded?
How to record the information
What happens next?
Bibliography
Index
Acknowledgements
I must start by thanking Merryl Gelling and Robyn Stewart, both experienced ecologists with considerable expertise on water voles. They were kind enough to review an early draft of this book, and it is much improved as a result of their insightful comments.
This was always intended as a pictorial guide, and it is necessarily reliant on good-quality images. I am therefore incredibly grateful to all those who have kindly allowed me to use their photos in this book: Simon Booth (Simon Booth Photography), Jo Cartmell (NearbyWild), Coral Edgcumbe, Derek Gow, Gareth Harris, Magnus Johnson, Kevin O’Hara, Stefanie Scott and Robyn Stewart. Thank you also to Hugh Brazier, who skilfully edited my initial text, and to BBR Design who have patiently turned the text and the jumble of photos that I sent into this book.
I am forever indebted to Rob Strachan. Without his knowledge of water voles, his willingness to share this knowledge, and his passion for their conservation, I wouldn’t have been able to write this book. I’m therefore delighted to have been granted permission to reproduce his drawings of water vole and rat footprints, taken from his book Water Voles, and I’m grateful to Jane Sedgeley-Strachan and Whittet Books for giving me consent to do so.
1. Introduction
A bit of background
As I sit down to write this book, the water vole (Arvicola amphibius, previously A. terrestris) has been a protected species in the United Kingdom for more than 20 years, and has been identified as one of the UK’s most rapidly declining mammals for over three decades. And it’s probably fair to say that over those last 20–30 years there’s been a significant amount written about this species. What else, you may reasonably ask, is there left to say?
The level of attention that the water vole has received in recent times also means that many professional ecologists and amateur naturalists will have had the opportunity to undertake, or get involved in, a water vole survey. They may have recorded its field signs or even seen the animal itself. Why then, do we need another book on this species?
Well, the answer is this: water voles are still declining and the number of water voles in the UK is predicted to continue falling (Mammal Society 2018). There is an increasing need for action to conserve them, and an urgent necessity for them to be considered appropriately in the context of development projects. And this means that surveys must not only be carried out, but done well. Over the years that I’ve been working on water voles, I’ve come across many situations where this hasn’t been the case – where surveys have failed to spot their presence, perhaps because the animals were using habitat that the surveyor assumed they wouldn’t, or because the field signs were interpreted incorrectly. This can be costly for a developer, if the failure occurs during a survey to inform a planning application, for example, or could even result in a prosecution if the mistake isn’t spotted in time. On the other hand, in some cases, it may never come to light. But irrespective of the scenario in which it happens, or the reasons for it, the main ‘loser’ is the water vole. Important protection measures may not be put in place, appropriate management activities may not be undertaken, and conservation efforts may not be directed to the correct locations.
This book, then, is my attempt to help minimise the likelihood of such errors happening in the future.
Firstly, it’s critical that those individuals involved in undertaking water vole surveys, or ecologists tasked with determining where to survey for water voles, or deciding whether a water vole survey is needed, have a good understanding of the range of habitats that this species will use. What are its preferred habitats? But also, where might you still find it, even where the habitat is less than optimal? So, in this book you will find a detailed description of some of the different habitats that water voles use, illustrated with photographs. I’ve included an explanation of how water voles use the habitat, thereby allowing the surveyor to assess how suitable or otherwise a given habitat is, and also to apply the principles to specific habitat types that I haven’t covered.
Secondly, when we undertake water vole surveys we are searching for field signs. These provide us with valuable information, provided that we can find them, and that we can identify them correctly. There have been many occasions when I know that surveyors have failed to do this. So what you’ll also find in this book is a very detailed description of water vole field signs, illustrated with lots of photographs (who doesn’t like a photo of some poo?), as well as tips on how to distinguish these from those of other similar species (yes, you guessed it, you may well have to sniff