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Water Vole Newsletter

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Water Vole Newsletter WATER VOLE AMERICAN MINK CONFERENCE Editor: Martin Ketcher, 2017-18 American Mink – predator Water Vole Conservation and Invasive Non-Native The main cause of the decline in water vole use in the last five years are shown on Species Officer populations is predation by the invasive the map (right). There may be others that Water vole newsle tter non-native American mink Neovison vison are still functioning but are not included so controlling mink numbers is paramount on the map. If you know of any please WATER VOLE, MINK AND NON-NATIVE INVASIVE SPECIES NEWS IN HERTFORDSHIRE AND MIDDLESEX for water vole conservation. As with the get in touch. As you can see, there are water vole, the situation with mink seems large gaps and some rivers where there Thank you... to be similar to earlier years. are very few rafts. The conservation of water vole in Hertford shire and Middlesex is The positions of mink rafts within the At least 27 mink were caught in 2017. dependent on the efforts of volunteers, county that are known to have been in so whether you are a water vole All but one of these were caught on the surveyor or check a mink raft, thank Welcome... Lee or the Stort and many were on the Mink raft MINK CAPTURES locations you very much for everything you have ...to the 2018 Newsletter. Essex side of the rivers. As before, most done. The list of those involved is l This is the annual report on 2017 l YEAR TOTAL HERTS ESSEX i of the mink caught in the lower Lee Valley H longer than ever so, as before, I have the situation within the Trust’s m i not attempted to list everyone this year. 2017 27 7 20 were as a result of the efforts of the T : o area – the whole of Hertfordshire t 2016 23 14 9 rangers of LVRPA, coordinated by Dawn o Thanks are due to the Environment h P and the boroughs of Barnet, 2015 33 14 19 Richardson, while the mink rafters on the is not down to the availability of water Agency and the Lee Valley Regional Park Authority for their continued funding Enfield, Harrow and Hillingdon. 2014 33 7 26 Stort are coordinated by Bob Reed. Both voles as prey! It does illustrate the the Lee and the Stort are important rivers importance of maintaining the mink for the Water Vole Conservation and 2013 40 20 20 for water voles so it is hoped that the control effort everywhere within the Water Vole, Mink and Invasive Non-native Invasive Species Officer post 2012 34 26 8 in 2017/18 at Herts and Middlesex increase in mink on these rivers in 2017 two counties. Species Conference Wildlife Trust. t r e b b In 2017 the annual conference was a way for anyone to report evidence i H If you would like a new raft or if once again kindly hosted by Affinity of pollution. m i T you know someone who might be n o : i o Water in Hatfield on Thursday 9th Jack Herriot , EA Geomorphology s • i t able to take a raft, anywhere in the V o 0 h November. Technical Specialist, talked about the 2 P county, please get in touch. If you 0 2 / r work that the EA has done with the e need guidance on the use of the raft k a t t Tim Hill , HMWT Conservation Boxmoor Trust to improve the River i or on the safe dispatch of captured • h W y Manager chaired the evening. Bulbourne in Hemel Hempstead. r mink please refer to the Mink r e T Martin Ketcher , HMWT Water Vole Bob Thornton from the River Beane : • • o Control booklet from the Wildlife t Water vole update o h Trust or go to the website of the Conservation and Invasive Non-Native Restoration Association spoke about P Game and Wildlife Conservation Species Officer, gave a 2017 water vole, how the RBRA has been working with 85 sites were surveyed for water vole Distribution Trust www.gwct.org.uk mink and INNS summary. HMWT towards a possible water vole Registered address: Distribution • Dr Djami Djeddor , Senior Scientific re-introduction on the river. in 2017. Of the 85 surveyed sites, 37 The map (right) shows the distribution Herts and Middlesex had water voles, four had signs that of water Officer and project manager, a plant • Cath Patrick , LVRPA Senior Wildlife Trust, of water voles in Hertfordshire and pathologist working on the biological Conservation Officer, gave us her Grebe House, could have been water vole, three that down the River Colne into Middlesex. voles control of invasive weeds at the annual update on what the LVRPA have St Michael’s Street, had signs that were probably not from Overall the picture is similar to previous St Albans, AL3 4SN River Corridor Survey –the River Beane Centre for Agriculture and Bioscience been doing for water vole conservation. water voles, and 44 had no signs. years. While there is some evidence Ideally, to confirm the presence of of expansion in water vole populations The River Corridor Survey (RCS) is a way After training, a group of volunteers from surveyed part of the River Beane, International (CABI), gave us an update • Bob Reed , Living Rivers Champion for 01727 858901 inf [email protected] water voles it is necessary to find a in the two counties the situation could to assess a river in considerable detail. the River Beane Restoration Association contributing to the River Corridor on research towards finding biological the River Stort, wrapped up the evening www.hertswildlifetrust.org.uk latrine. It is more difficult to be certain be a lot healthier so it is important to RCS records such things as water depth (RBRA) have used a slimmed-down Survey assessment of the river and controls for INNS. with a talk about a small re-introduction Registered in England: 816710 that feeding signs are from water maintain the conservation effort. and width, type and extent of vegetation version of the RCS to survey the Beane. now most of the river from Watton- • Rod Cutler from the Colne Valley of water voles on Sawbridgeworth Fisheries Consultative (CVFC) spoke Marsh to link up with the Thorley Wash Registered Charity: 239863 voles if no other signs are present cover within the river, and on the bank, RBRA member Bob Thornton organised at-Stone down to Hertford has been hence the ‘possible’ category. and produces much more detailed maps several volunteer sessions, such as the surveyed. The results will be digitised about the Consultative’s River Outfall population and hope-fully boost overall Key Site Surveys Monitoring Project (ROMP), essentially numbers on the upper Stort. There are some places across the area than are produced when mapping water one shown below, with RBRA member and analysed to see which areas have All maps... The table below shows the yearly vole surveys. Marcella Randall. The volunteers the best water vole habitat and what comparison of surveying results. The that are key sites for water voles. This could be done to improve the river for © Crown copyright and database rights 2017 proportion of positive sites remains is almost certainly because these sites water voles. Hopefully this will lead How Ordnance Survey 100048466. You are not are a complex of water bodies within n Train as a As a surveyor, if you come permitted to copy, sub-licence, distribute or similar to previous years indicating that ca • • a relatively small area. Unlike on a to a water vole re-introduction on the you water vole across a raft on a survey please sell any of this data to third parties in any water vole populations are broadly stable. river at some point in the future. LP surveyor. check it and let the Trust know form. YEAR ON YEAR WATER VOLE SURVEY RESULTS E what you find, including Training H ter 2017 2016 2015 2014 2013 2012 2011 wa • Become a evidence of water voles. In 2017 there were two survey les Number of sites surveyed 85 78 78 68 79 60 46 y o mink raft e v s s training sessions – one in March at u checker. Let the Trust know if Printed by N2 Visual Communications on Xerox Colour Number with voles 37 24 31 27 24 19 12 H • e t Thorley Wash for volunteers from Impressions Silk, an FSC certified stock made from t you see water vole or mink o % with voles 44 31 40 40 30 32 26 l r a minimum of 50% recycled fibre, at a mill that has been a the River Beane Restoration h If you have a mink anywhere in the county, or single-channel river, it will be difficult C awarded the ISO140001 certificate for environmental Number with possible signs 4584710 : • o t Association (RBRA) and a second o raft that isn't checked as often as if you come across either species management. for mink to find and eliminate all water h % with possible signs 5610 6920 P V in April at Tewinbury, with a total voles. These sites are usually nature RBRA member Marcella Randall surveying part of it should be, let us know and we killed on the road or in some of 21 people trained. Designed by Wildcat Design ([email protected]) Number with no water vole signs 44 49 39 37 48 40 34 the River Beane, November 2017 Water vole survey on can organise others to check it. other way. reserves so knowing which parts of the the River Beane % with no water vole signs 52 63 50 54 61 66 74 site are used by continued overleaf ª Protecting wildlife for the future Protecting wildlife for the future INVASIVE INVASIVE WATER VOLES NON-NATIVE PLANTS NON-NATIVE PLANTS ª continued from previous page park’s survey areas include three KEY SITE SURVEY – Panshanger 2017 Water Vole update sections of the River Mimram, four Spring Autumn sections of lakeside from three lakes, Annual Survey – results Section Latrine Feeding Latrine Feeding sign sign two parts of the Broadwater and three ditch sections.
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