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Bristol Naturalist News Contents / Diary of events JULY-AUGUST 2018 Bristol Naturalist News Photo © Dave Roberts Discover Your Natural World Bristol Naturalists’ Society BULLETIN NO. 572 JULY-AUGUST 2018 BULLETIN NO. 572 JULY-AUGUST 2018 Bristol Naturalists’ Society Discover Your Natural World Registered Charity No: 235494 www.bristolnats.org.uk ON RESIDENT H . P : Andrew Radford, Professor CONTENTS of Behavioural Ecology, Bristol University 3 Diary of Events HON. CHAIRMAN: Ray Barnett Editor’s Email change [email protected] HON. PROCEEDINGS RECEIVING EDITOR: 4 Society Midweek walk; Phenology ; Dee Holladay, [email protected] Welcome – new members + a mystery! HON. SEC.: Lesley Cox 07786 437 528 5 Flora 2020 also needs you! [email protected] HON. MEMBERSHIP SEC: Mrs. Margaret Fay Talking Trees / Tree of the Year / Purple Sycamore 81 Cumberland Rd., BS1 6UG. 0117 921 4280 [email protected] HON. TREASURER: Mary Jane Steer 6 Obituary: Brian Frost 01454 294371 [email protected] Society Walk Report BULLETIN COPY DEADLINE: 7th of month before 7 BNS/Univ. programme; Meeting report publication to the editor: David B Davies, 51a Dial Hill Rd., Clevedon, BS21 7EW. 8 Natty News: 01275 873167 [email protected] 10 BOTANY SECTION . 11 Botanical notes : Members Health & Safety on walks participate at their own risk. They are responsible for being properly clothed and shod. 15 INVERTEBRATE SECTION Dogs may only be brought on a walk with prior Notes for July/August; Meeting report agreement of the leader. 16 GEOLOGY SECTION 17 LIBRARY Journals, Magazines etc. “What’s in YOUR bookcase…” Geological sites of the Bristol Region – a new publication by BRERC 19 ORNITHOLOGY SECTION Seabird photo opportunity repeated; Recent News Meeting reports; 23 MISCELLANY Botanic Garden Gorge & Downs Wildlife Project Avon Organic Gp.; Badock’s Wood 24 Photos Cover picture: Thanks to Dave Roberts, whose boat gave BNS members a grand experience – see an account under Bristol Naturalists’Ornithology Society (page 21) Discover Your Natural World 2 Registered Charity No: 235494 www.bristolnats.org.uk Diary of events Back to contents Council usually meets on the first Wednesday of each month. If you plan to attend please check date & time with the Hon. Sec. (from whom minutes are available to members). Any member can attend, but must give advance notice if wishing to speak. Visitors & guests are welcome at any of our meetings. If contact details are given, please contact the leader beforehand, and make yourself known on arrival. We hope you will enjoy the meeting, and consider joining the Society. To join, visit https://bristolnats.org.uk and click on membership. Members are members of ALL the sections. JULY 2018 Sun 1 Lords Wood Invertebrate 10:30 page 15 Tue 3 Somerset & Devon Coast Ornithology 12:30 page 19 Tue 3 St George’s Flower Bank Botany 18:30 page 10 Thu 5 Society Walk, Easter Compton Society 10:00 page 4 Sun 8 Blackmoor, Ubley Warren & Velvet Bottom Ornithology 09:00 page 19 Sat 21 Walton Common Botany 14:30 page 10 AUGUST 2018 Sat 18 Tree Gazing BNS/University 14:00 page 5 Sat 18 Northwick Oaze Botany 14:30 page 10 OTHER ITEMS OF INTEREST Sun 8 July Awres Glow GlosNats 11:00 page 10 Sat 21 July Ravensgate Hill GlosNats 11:00 page 10 Sun 29 July Portishead Coast (Geology) WEGA/Thornbury 11:00 page 16 Tue 7 Aug Stinchcombe Hill GlosNats 18:30 page 10 Thu 23 Aug Black Down, Mendip SRPG 11:00 page 11 Thu 30 Aug Stroudwater Canal GlosNats 11:00 page 11 Editor’s email change The editor’s provider, which.net, will shortly cease to exist. His new (and only) email is: [email protected] 3 SOCIETY ITEMS SOCIETY MID-WEEK WALK Contents / Diary Thursday 5th July, Spaniorum Hill, from Easter Compton About three miles (but with a climb) Meet at 10am in the car park of the Fox Inn, Main Street, Easter Compton, BS35 5RA / ST 571825. About 1 mile after M5 J17, Easter Compton exit. On arrival, we have been asked to park in the far gravel area, in lines facing the road. For almost all, find your way to Cribbs Causeway, M5 J17, but if heading South, you turn right instead of left, heading North, left not right. From Cribbs Causeway shops, it’s straight across the motorway roundabout. Pass ‘The Wild Place’, and carry on down the hill. The Fox is on the left. The walk involves a fairly steep, but dry paved, ascent, and a shallower descent. It would be wise to be dressed appropriate to the weather, and wear boots. The rewards are views over the Severn Valley and Estuary, and also an interesting church. It is a very short distance from Cribbs Causeway, yet feels deep in the country. Tony Smith will, sadly, not be leading this walk, so we will be relying on a bit of co-operative wildlife expertise. Lunch can be obtained from the Fox. http://www.thefox-eastercompton.co.uk/ It is a good pub, serving everything from sandwiches to steaks. If you intend to come, contact Roger and Mary Jane Steer: 01454 294371 or [email protected],uk, or, and If the weather is forecast as poor, we will contact you, to save your journey. 07772 411705 on the day. If you know (and maybe could lead) a suitable walk on a mid-week, please get in touch. PHENOLOGY Contents / Diary May was an extraordinary month, with the same violent temperature swings as April, but an overall average which was the same as the previous record, set in 1901 of 19.6ºC. It was also a dry month, with half normal rainfall, though, if you were hit by one of the thunderstorms in the last week you may well have had much more. My rainfall readings are taken from my own rain gauge. And it was the sunniest May I have recorded, back to 1997, with 30% more sunshine that average. As a result of the stimulus of high temperatures and bright sunshine all the species that had been held back from flowering in April came into bloom; by the end of May a few species were recording earlier than average dates for coming into flower. One consequence of this was that flowering periods were shortened. Hawthorn for instance is normally in flower for five weeks, and in 2002 was flowering for ten weeks, but this year was over in three. A cause of this is the explosive increase in pollinator numbers driven by the same factors. Richard Bland Welcome to new members – and a mystery person! Mrs. Carey; Mr Edward O'Brien; Mr Richard Woodrow; M and G Cove; also to Deirdre Jones, who paid a subscription but of whom we have no other record: do you know her? She needs to contact the membership secretary (page 2) in order to receive the publications to which she’s entitled! 4 Flora 2020 Contents / Diary There are around fifty monads (one-kilometre squares) that need surveying for the new Flora and for the BSBI Atlas. I have a simple tick list of the 200 commonest species in the region, and surveying the number present in a monad is itself a fascinating exercise. Anyone interested in helping should contact Richard Bland on [email protected] or 0117 968 1061 Talking Trees The Woodland Trust has launched a campaign on social media to support the aim of doubling the tree canopy in Bristol by 2050. This is a part of a wider Urban Forest concept seeking to persuade everyone that trees in cities provide huge and quantifiable benefits Trees don’t just reduce temperature, sequestrate carbon dioxide and look beautiful, they produce oxygen. Two trees will produce enough Oxygen for a family of four. Go to the website at www.talkingtreesbristol.co.uk to find out more. Bristol Tree of the Year The Bristol Tree Forum has launched a Bristol Tree of the Year competition. The objective is to make Bristol citizens more aware of their astonishing tree heritage. There is an entry form on www.bristoltreeforum.org.uk, and it is open to any group or organisation. The tree chosen should lie within the Bristol City boundary, and be publicly accessible and entries should send a photo or three and 500 words on why the tree is special. The deadline for entries is Sept 1. A short list will then be created by an expert panel, and Between Oct 15 and Nov 15 the public will be asked to vote. The winner will be announced during National Tree week, Nov 24 to Dec 2. The BNS will certainly submit a candidate, and anyone with a proposal should contact me at [email protected] or 0117 968 1061 Purple Sycamore The Purple Sycamore is an uncommon natural variant of the Sycamore. The underside of its leaves is purple, rather than green, and gives the whole tree a rather heavy appearance, but looks magnificent when the wind blows, exposing the purple undersides. It can turn up anywhere, and some trees tend to become more purple as the season advances. It is readily confused with a Norway Maple, which is widely planted and exists in a variety of colour forms, but there are two key differences. Norway Maples have bark which has long vertical troughs, where as the Sycamore bark breaks off into plates, like the Plane. Secondly the Norway Maple’s leaves have sharp points to each lobe, whereas Sycamore leaves are blunt. I have accumulated a list of about 25 Purple Sycamore sites in Bristol, and would be grateful for any records, giving details of the site.
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