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White Admiral W h i t e A d m i ra l Newsletter 84 Spring 2013 Suffolk Naturalists’ Society C o n t e n t s E d it o r ial Ben Heather 1 C hala ra - Ash Dieback Steve Scott 2-3 Suffolk Bat Group Update and looking Sue H o o to n 4-6 f o rwa rd Newton & Wrigley Steve Piotrowski 7 Beetling about on Orford Beach Chris Hitch 8 -9 Recording Purple Hairstreaks along Richard Stewart 10-11 Westerfield Road A Short Update on Suffolk Dormice Liz Cutting 12-14 Stag Beetle Predators Bob Stebbings 15-16 Two interesting records from the Adrian Chalkley 16-19 Grove Farm monitoring project The impact of street lighting on Adrian Knowles 20-21 p lan ts Alder Gall/Fungus Colin Jacobs 21 Where is Thorpe Ness? Caroline Markham 22-23 AGM & Spring Members Evening 24-25 Rosehill sale notice 25 Geo Suffolk Field Meeting 26 Halesworth Festival of Ecology 27 Events by Suffolk Butterfly 28 Conservation ISSN 0959-8537 Published by the Suffolk Naturalists’ Society c/o Ipswich Museum, High Street, Ipswich, Suffolk IP1 3QH Registered Charity No. 206084 Cover photograph of Brimstone taken by Matt Berry at Holywells Park, Ipswich http://www.greenwings.co/ Newsletter 84 - Spring 2013 Even if the weather isn’t showing it, there are a few signs that spring may indeed be on its way. I am writing this editorial on another day disrupted by snow (12th March) and remembering that only a week ago we were experiencing temperatures that, in some places, exceeded 15°C. With that heat came the first messages, through the Suffolk Natural History Yahoo group, of Brimstone butterflies on the wing, in West Stow and Sudbury. A species I always associate with the changing seasons, I thought Matt Berry’s excellent capture on the front cover may spread some hope that winter will soon end. As I continue my editorship of the White Admiral I would like to thank all who have contributed to what is a very full issue, but please keep sending copy in, this is your newsletter! Please also turn your attention to the back pages of this edition where you will find details of the SNS AGM and some interesting events that will be running this Spring/Summer. One of these events is the SNS, SOG and SWT Taster Day, on 29th June, at Knettishall Heath. This promises to be a chance to sample and see what we do and is open to all, expert or novice. More details to follow… For snippets and other news please visit our website www.sns.org.uk or follow @SuffolkBRC on twitter. Editor: Ben Heather Suffolk Biological Records Centre, c/o Ipswich Museum, High Street, Ipswich, IP1 3QH [email protected] White Admiral 84 1 C h al a r a ash dieback Don’t panic! Scientists think that disease has spread through Europe this disease has been with us for since the early 1990s, and was three or four years, but I couldn’t finally discovered in the wild on point you to a single mature tree the east coast of Britain in October that has died. There really is no 2012. Although we might expect to need to act in haste, but be aware see a spread across the whole and be prepared. country over the years, the initial Chalara fraxinea is a fungus that hot spots appear to be in Suffolk, spreads from ash leaves into the Norfolk and Kent. tree and blocks the water-carrying The Forestry Commission is vessels, thus starving the tree of working with Natural England on water and minerals. Young trees guidelines on the ecological aspects and fresh growth may die quickly, of Chalara, but in the meantime as but older trees can survive for a professional forester, I would years. suggest the following basic dos and First observed in Poland, the don’ts: 2 White Admiral 84 Don’t plant ash, certainly not Forestry Commission until the disease has run its Woodland Officer. course and/or resistant strains Do keep access to woodland are developed. open. The risk of woodland Do use this as an excuse to visitors spreading the disease plant other trees. The is low, but take sensible woodland cover of England is precautions – for example, 10% compared to the European brush leaves and twigs off average of over 40%. There are boots, clothing and other items many sensible alternative taken into the woodland, and native species with which to wash boots and bicycle wheels replace ash (pick the right tree etc… when returning home for the right place), and if from a walk. Avoid routes native is not a key factor, there which go from wood to wood to are some close visual wood. If organising a parish replacements such as walnut walk, for example, it might be and hickory. sensible to provide washing Don’t coppice or pollard. facilities (some bowls or trugs Don’t fell mature ash trees just and stiff brushes at the end). because you suspect disease or It’s worth pointing out that there because an unscrupulous tree are many new diseases and pests surgeon tells you so. Obviously, of trees that have hits these shores health and safety is in the last few years, some as paramount, but employ a fully serious as Chalara, but less qualified member of the infamous. It is important to keep Arboricultural Association or an eye on the health of all trees. follow the guidance in “A For the latest information keep an common sense approach to tree eye on www.forestry.gov.uk/ safety” (www.ntsg.org.uk). chalara. Specifically you might like Do consider burning, burying to look at the three videos we shot or composting ash leaves in late last year, two on identifying gardens or tree collections to the symptoms and one on limit the spread of C. fraxinea biosecurity. spores. Do continue to manage Steve Scott woodland. There are many Forestry Commission options so contact your local White Admiral 84 3 Suffolk Bat Group update and looking forward Suffolk Bat Group was formed in 1984 as a specialist group within the Suffolk Wildlife Trust and is the county’s main point of contact for all bat conservation related issues. It is one of 90 bat groups nationwide and co-operates with The Bat Conservation Trust and species, of which two new species Natural England. The aim is to have been discovered and one assist in the protection of bats in rediscovered after many years Suffolk through advising house- absence in the county. holders, landowners, builders and Suffolk Bat Group was very busy developers. in 2012 and one highlight was Over the years much effort has producing a new distribution atlas been put into protecting, enhanc- for bats in Suffolk, in conjunction ing and creating hibernation sites, with SBRC. This updated the carrying out surveys using bat atlas, from 2000, shows the spread detectors and computer software, of different bat species throughout establishing bat box projects and the county. carrying out specific surveys on The new atlas not only shows, due barns and churches. Over 2200 to an increase recording activity records have been collected on 13 and improvements in bat detecting technology, a rise in the number of bat records collected, since the last atlas in 2000, but also an increase in the number of different species being recorded. The new atlas can be downloaded from the SBRC website (www.suffolkbrc.org.uk/) and the Suffolk Bat Group pages on Bat Surveying © Arthur Rivett Suffolk Wildlife Trust website 4 White Admiral 84 (www.suffolkwildlifetrust.org/ Suffolk Bat Group bat detector species-and-habitats/species- surveys are carried out at various projects/suffolk-bat-group/) . fixed points around a site, Suffolk Bat Group sends all records specifically identified as suitable to SBRC from a variety of sources habitat for bats. The points are that help to update the atlas chosen because they offer good including; sheltered feeding areas for bats so Bat roost visits for Natural as to maximize the amount of England feeding activity detected. Batbox Duet bat detectors are used in Monitoring of bat hibernation conjunction with digital recorders sites to record bat echolocation and Bat detector surveys recording times are synchronized, National Bat Monitoring running for 90 minutes. Analysis Project (NBMP) surveys of the recordings is done later on Bat walks / events computer using Batscan and Batsound analysis programmes. No experience is necessary to take Distribution map for Barbastelle bat from Suffolk Bat Atlas 2011 White Admiral 84 5 part in these surveys and reports are provided to landowners on managing their woodland for bats. The NBMP surveys are organised by Bat Conservation Trust through a volunteer network to monitor the status of many of our bat species across a range of habitats. Anyone can take part in these surveys and some are aimed at beginners as Barbastelle bat © Arthur Rivett well as experts. BCT provides on -line tutorials to help identify the detector and are willing to species encountered volunteer for a survey, please get (www.bats.org.uk) and there are a in touch. We are hoping to get whole series of surveys that you funding for lots of bat detectors to can get involved in. Regular counts loan out to members for NBMP of breeding colonies do not require surveys so if you’re interested in any bat licence and are easy to taking part, do let us know as this carry out. Slightly more involved will help our funding applications.
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