Wasp Spider boom at Thames Road Wetland

There is an unusually large number of Wasp Spiders (Argiope bruennichi) at Thames Road Wetland this year, something first noticed by Jason Steel a week ago when he counted 32. Yesterday I managed 38, though I wouldn’t say this was the result of a thorough search, just an attempt to beat Jason’s figure. The species was first found at the site a few years ago but has not been spotted again for some time.

The animals are inhabiting a general area of approximately 964 square metres, giving an average of 1 per 25.4 sq m. However, the actual density in the most suitable parts of the habitat is much higher, with it being possible to find several quite close together. All the webs, which have a distinctive zig-zag weave below the centre, are amongst longish fine grasses, and appear not to be in areas dominated by dead herbaceous  material. This may be because the spiders are seeking prey such as Grasshoppers, one of which was seen to be rapidly pounced upon and wrapped in silk when it made the mistake of  jumping into a web.

Wasp Spider at Thames Road Wetland (Photo: Chris Rose)

Wasp Spider at Thames Road Wetland.  The zig-zag weave below the centre, called the stabilimentum, can be clearly seen. Its function is not understood. (Photo: Chris Rose)

The zigzagweave below the centre of the web, called the stabilimentum, is distinctive, but its function is not understood. (Photo: Chris Rose)

The same Wasp Spider from a slightly different angle. (Photo: Chris Rose)

The Wasp Spider was first recorded in the UK in the 1920s, but has become more prominent in recent years, and has been recorded from various parts of Bexley including Erith Marshes (Crossness), Grasmere allotment site  and Streamway.

It would be interesting to hear whether this apparently exceptional number of individuals is a freak event or is matched by increased numbers elsewhere in the Borough.

Chris Rose, Volunteer Site Manager, Thames Road Wetland

 

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Some recent Bexley butterfly photos by Mike Robinson

 

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New rarity – Britain’s ‘largest’ fly, the Hornet Robber – found at Thames Road Wetland

Jason Steel, a leading local wildlife photographer, has captured a picture of the rare Hornet Robber Fly (Asilus crabroniformis), at Thames Road Wetland.

Hornet Robber Fly at Thames Road Wetland, 6th August 2016 (Photo: Jason Steel)

Hornet Robber Fly at Thames Road Wetland, 6th August 2016 (Photo: Jason Steel)

According to Buglife, this predatory species, which protects itself by resembling a Hornet, is thought to now breed in only 40 isolated sites in the UK. In any event it is thought to have declined by around 25% between 1980 and 2000 and is now a UK Biodiversity Action Plan species. It is said to be ‘arguably’ our largest fly at over an inch long.

https://www.buglife.org.uk/bugs-and-habitats/hornet-robberfly

Females lay their eggs on cow, horse or rabbit manure, with both the latter two being present at the wetland site.  The larvae are thought to dine on dung beetle grubs in the ground beneath.

Livestock medications, overgrazing (which reduces insect prey for adults) and lack of dung are thought to have driven the decline in numbers.

We will now look at whether any changes to site management are needed to assist this species. It would appear that suitable conditions  are already present and will need to be maintained.

Jason said’ I was at the Thames Road Wetland site yesterday (6th August) looking for bugs to photograph. This is the first time I’ve been down there for a month.

I counted 32 Wasp Spiders in the grass by Thames Road. I also saw 4 Hornet Robber Flies. I only managed to get close enough to one of them for a photo. This is an impressive specimen though. I reckon it was 35mm+ in length.’

Chris Rose, Site Manager

Posted in Invertebrates, Thames Road Wetland | Tagged , , , , | 1 Comment

Bexley Sites of Importance for Nature Conservation review saga – two and a half years later and still no sense of urgency

Bexley Natural Environment Forum continues to press Bexley Council on the long-overdue sign-off on the 2013 review by the London Wildlife Trust of the Borough’s existing and potential new Sites of Importance for Nature Conservation.

The fact that the deadline for public comments on the  final draft was almost two and a half years ago says everything about the value the Council attaches to nature in our Borough, as does the outcome of several recent planning decisions that will negatively impact SINCs and species in serious decline.

The latest correspondence over this long-running saga is set out below. There is still no target date for wrapping this up despite the fact that we are now over 20% of the way through the nominal lifetime of the document. It is not true to say – as the Council claims here –  that any departures from the draft recommendations will be merely due to errors and ‘technical’ issues and are somehow ‘apolitical’ and, by implication, unquestionable. The reality is that we know that a political decision has been taken to reject LWT’s proposal that the Borax fields be incorporated into the Erith Marshes SMINC and to keep it designated for employment (although up to 2010 the Council had a policy of seeking opportunities to increase the size of the SMINC area here) . There has also been a dispute over one of the best parts of Crayford Rough, which the Council has sanctioned building on, despite the 2004 and 2013 mapping showing it was within the SINC boundary, with LWT apparently believing this to be the case also. There is no visible ecological difference between one side of the line and the other. Meanwhile we wait to see whether the Council retains Erith Quarry as a Grade 1 SINC, which would in our view be a face-saving manoeuvre given that the planning committee voted unanimously to build over 70% of it and the important reptile population has been shovelled into a remnant that is half the size required based on the measured population density.  A further test will be whether the recommendation to promote ‘Crayford agricultural and landfill’ (at the south end of Crayford Marshes) from Borough Grade 2 to Grade 1 has been accepted given the massive Roxhill rail-road depot proposal looming over it.

Given that SINC status is an important consideration in making planning decisions, these matters are NOT politically neutral in effect – or at least shouldn’t be, though tell that to the planning committee. Given its voting record over the last two years most of its members don’t presently think that SINC designation means very much, and Council officers have thrice declined to define what, in their policy on the matter, is meant by ‘significant impact’ on such sites, thereby rendering planning decisions where this consideration applies both opaque and essentially unaccountable.

Erith Quarry, a Grade 1 Site of Importance for Nature Conservation, is a woodland edge/ scrub site that could potentially support Nightingales - but not if Bexley Council agrees to the plans to build over most of it. If Lodge Hill can't be protected, what chance sites like this?

Erith Quarry, currently a Grade 1 Site of Importance for Nature Conservation, but Bexley Council has agreed to plans to build over most of it. 

 

Relevant correspondence:

Subject: RE: SINC review sign-off?

From:    “Luckhurst, John” <John.Luckhurst@bexley.gov.uk>

Date:    Fri, July 15, 2016 3:03 pm

To:      “chrisrose@gn.apc.org” <chrisrose@gn.apc.org>

Cc:      “Councillor Bailey, Linda” Linda.Bailey@bexley.gov.uk>,          “Councillor Slaughter, June” <June.Slaughter@bexley.gov.uk>,          “Thomas, Ben” <Ben.Thomas@bexley.gov.uk>, “Taylor, Mark” <Mark.Taylor@bexley.gov.uk>,  “Ray Gray, BNEF

———————————————

Dear Mr Rose,

I refer to your email to Ben Thomas and subsequent email to Councillor Bailey. This is a response to both emails.

The LWSB meeting has now examined the process for producing the SINC document and the finalising of this SINC document is underway. This will be undertaken as soon as possible but will be subject to the availability of staff resources and other work priorities.

It is not our practice to specify changes between draft and final versions of evidence base documents as these are technical documents where changes arise from factual errors or technical matters and processes.

Kind Regards, John Luckhurst, Strategic Planning and Growth, London Borough of Bexley,

—–Original Message—–

From: chrisrose@gn.apc.org [mailto:chrisrose@gn.apc.org]

Sent: 14 July 2016 19:12

To: Councillor Bailey, Linda, Cc: Thomas, Ben; Luckhurst, John; Taylor, Mark; Councillor Slaughter, June

Subject: SINC review sign-off?

Dear Councillor Bailey,

SINC review saga.

Since we have not had an acknowledgement of, nor a reply to, the e-mail set out below within the Bexley Council customer services target of 5 working days, and given that the relevant webpage still shows no indication that the review has been signed-off (http://www.bexley.gov.uk/article/12495/Sites-of-Importance-for-Nature-Conservation), perhaps you can appraise us of the current situation, including what happened at the LWSB if, indeeed, the document has actually got that far, and your projected timetable for publication of the final version. A response to the point about flagging up any changes made would be most welcome.

Thanks, Chris Rose. BNEF

—————————- Original Message ——————–

Subject: SINC review sign-off?

From:    chrisrose@gn.apc.org

Date:    Sat, June 25, 2016 6:29 pm

To:      ben.thomas@bexley.gov.uk,  “Luckhurst, John” <John.Luckhurst@bexley.gov.uk>,  mark.taylor@bexley.gov.uk  Cc:  ray Gray, BNEF, “june.slaughter@bexley.gov.uk” <june.slaughter@bexley.gov.uk>

——————————————————-

Dear Ben,

There still no sign of finalised SINC documentation on the Council SINC info webpage, and although I’ve Googled various formulations of words about this, nothing is coming up. Maybe there’s something buried in some committee papers somewhere. Anyway, can you tell us what the latest is on this? We were under the distinct impression that it was going to the LWSB in May and would have been done and dusted by now.

In relation to this, will there be a written statement by the Council as to any departures that have been made from the Dec 2013 document? As you know, other ‘stakeholders’ have not been party to whatever issues Bexley has had with this (except by accident – see Crayford Rough boundary) and it would obviously be helpful to ourselves and others to have a list of any recommendations that were not accepted or that were amended, rather than having to compare the 2013 and final documents line by line.

Thanks, Chris Rose, Vice-chair, Bexley Natural Environment Forum

_________

Chris Rose

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Cemeteries are haven for Harebell and other uncommon plants

Harebell (Campanula rotundifolia) , a rare plant in London, and other species that are uncommon in the capital or Bexley,  such as various low-growing clovers, Trailing St. John’s-wort, Changing Forget-me-not and Ivy Broomrape find a haven in the Borough’s cemeteries where the ground has not been fertilized, weed-killed or re-sown with sports turf grasses.

These Harebells were photographed in Christchurch cemetery, Bexleyheath, by Mike Robinson on 29th July.

Harebell group Mike R

Harebell close-up Mike R

_______________

 

 

 

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Lesnes Abbey (Woods) Conservation Volunteers issue programme of August/September events

This Lesnes Abbey (Woods) Conservation Volunteers group, which maintains and enhances the woods for wildlife meets at 12 noon at the picnic tables by the Lesnes visitor centre every second Sunday. No particular skills are needed to get involved, there is no membership fee and new recruits are always welcome.

Sunday August 7 – Wildflower Meadow

Controlling the more aggressive species that threaten to engulf the wildflowers. Sunblock is recommended.

Sunday August 21 – Heath

Keeping the bracken and brambles in check to encourage the heather. Again sunblock is recommended.

Sunday September 4 – To be arranged. Probably a walk but perhaps we could decide on the day.

Sunday September 18 – Fountain Pond

Clearing some of the more vigorous species to allow more room for the frogs and newts. Bring your wellies!

____________

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Some plants of Gatton’s Plantation, 23rd July 2016

Gatton’s Plantation is an oblong piece of woodland lying to the east side of Cocksure Lane (from which access can be gained through a wooden gate) and the north side of Parsonage Lane. It is separated by a narrow strip of horse-grazing fields from Joyden’s Woods to the east and is managed by the Woodland Trust.

The tree cover is extremely dense, yet there is a well-developed understorey and groundcover helped, one suspects, by the limited amount of pathways and absence of any large grazing animals. There are a number of large Turkey Oaks and quite a lot of Elm along the Parsonage Lane margin, which would be worth checking for White-letter Hairstreak butterflies.

Parts of the main path were quite damp on what was my first ever my visit and there were Rushes present, along with Square-stemmed St. John’s-wort which favours such conditions, and only occurs in a handful of places in the Borough.

Square-stemmed St. John's-wort in Gatton's Plantation. (Photo: Chris Rose)

Square-stemmed St. John’s-wort in Gatton’s Plantation. (Photo: Chris Rose)

There was also a single plant of Hairy St. John’s-wort, which is also found at Braeburn Park and on the sewer pipe bank by Thames Road Wetland.

Hairy St. John's-wort by damp main track in Gatton's Plantation. (Photo: Chris Rose)

Hairy St. John’s-wort by damp main track in Gatton’s Plantation. (Photo: Chris Rose)

Wood Spurge, an ancient woodland indicator species, was present.

There were a number of gone-over flower heads of Wood Spurge in evidence. (Photo: Chris Rose)

There were a number of gone-over flower heads of Wood Spurge in evidence. (Photo: Chris Rose)

A yet-to-be-identified Mint was enjoying the moist conditions.

Unidentified, possibly hybrid, Mint. (Photo: Chris Rose)

Unidentified, possibly hybrid, Mint. (Photo: Chris Rose)

There was a single plant of Spurge Laurel (Daphne laureola), which I have yet to see anywhere else in Bexley.

Spurge laurelp at gatton's Plantation (Photo: Chris Rodse)

Spurge Laurel at Gatton’s Plantation (Photo: Chris Rose)

The native Honeysuckle was also present, larval foodplant of the White Admiral butterfly, two of which were seen in the glades here, and also plenty of Violets, larval foodplant of the Silver-washed Fritillary, which was not found (though the plants were in very shady places). There were also some good patches of Greater Stitchwort.

 

Honeysuckle (Lonicera periclymenum) in the plantation. (Photo: Chris Rose)

Honeysuckle (Lonicera periclymenum) in the plantation. (Photo: Chris Rose)

There are coppiced glades either side of the central pathway in which most of the butterfly activity can be found.

Gatton's Plantation glade in the late afternoon sun. (Photo: Chris Rose)

Gatton’s Plantation glade in the late afternoon sun. (Photo: Chris Rose)

More of interest could doubtless be found on a longer visit, with time to explore away from the main central pathway.

(Chris Rose)

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Concern over public footpath maintenance around Crossness

Dear Friends of Crossness Nature Reserve,

I have been getting a lot of complaints about the state of Footpaths 1 and 2 between the nature reserve and southern marsh/Eastern Way, and Footpath 2 that runs east-west from the nature reserve to Belvedere Road.

Unfortunately, these are public footpaths and as such are managed by Bexley Council and their grounds maintenance contractors. I have contacted Bexley numerous times about getting these paths cut, but without success. Since the paths haven’t been cut at all this year, it will be no surprise that they have all but disappeared (see photos attached).

Unfortunately, I do not have the resources to cut Council footpaths, and with just my two volunteers, we are having a big enough battle keeping our own paths cut. I hate that they are in this state and impeding access, for which I am really very sorry, but could I encourage you to direct your frustration at Bexley, as Public Footpath owners, rather than myself please.

The general Bexley number is 020 8303 7171. The chap in charge of footpaths in the north of the borough is Tony Morris and he can be contacted at Antony.Morris@bexley.gov.uk.

Once again, apologies for the condition, but I’m really hoping that the Council’s grounds maintenance contractors will address this asap.

Kind regards

Karen Sutton – Biodiversity Team Manager

Posted in Crossness, Crossness Nature Reserve | 1 Comment

White Admiral butterfly confirmed as Bexley resident

The White Admiral (Limenitis camilla), a very uncommon species in London, with reports from only 3 sites as recently as 2014, has this week been confirmed as present in the Borough of Bexley.  Previous reports from Joyden’s Wood and nearby pointed strongly to this possibility, but with the Bexley/Dartford (London/Kent) boundary passing through the woodland itself, previous observers had been unable to confirm which side of the line their sightings had been made on. It has been an objective of wildlife recorders in the area to clarify the matter during this butterfly season.

Steve Carter had seen a White Admiral in Joyden’s Wood on July 18th and reported it on the ‘Bexley Wildlife’ Facebook page. When quizzed he gave an approximate grid reference which appeared to put him on the main path heading south-east from the Keeper’s Cottage, and was within Bexley. Armed with this information, Bexley Butterfly and Moth Group’s Joe Johnson, Mike Robinson and Chris Rose went in search of further sightings in this area on Saturday July 23rd. In the meantime, Mike had photographed one at the Parsonage Lane end of the wood on July 21st, believing that this too was inside the Bexley boundary.

The weather was somewhat changeable, with periods of no sun, then butterflies taking to the air as soon as it came out again. But we were in luck, seeing a White Admiral in the first area of young coppice by the side of the path that we came to, well within the Bexley boundary. Having never seen one before, it was surprising just how pale this ostensibly black insect appears at a distance when flying in sunlight, a bit like a ‘White’, but not quite.

A few Silver-washed Fritillaries were also seen utilising these recently coppiced areas, a species confirmed as a Bexley resident by Joe only last year, following the same issues over pinpointing the precise position of other sightings of it in relation to the Borough’s border.

Recently coppiced clearings beside pathways are providing ideal habitat for White Admiral, Silver-washed Fritillary and other butterfly species in Joyden's Wood (Photo: Chris Rose)

Recently coppiced clearings beside pathways are providing ideal habitat for White Admiral, Silver-washed Fritillary and other butterfly species in Joyden’s Wood (Photo: Chris Rose)

After Mike and Joe went off elsewhere, Chris headed south along the western margin of the wood towards Parsonage Lane. He saw another White Admiral and a Silver-washed Fritillary flying over the main ride and the lower vegetation on its north side, just beyond the end of the lane and adjacent to Chalk Wood. As far as can be deciphered from the available maps, the Bexley/Kent border runs along the ride itself at this point. Ralph Todd and Ian Stewart had reported seeing a White Admiral at some unspecified point along the margin of Chalk Wood in 2015.

Chris was even more pleased to find 2 White admirals in Gatton’s Plantation, a site he’d never visited before, and which is wholly within Bexley. This rather validates the 2003 record of the species made here by top botanist Mark Spencer, but which the London biodiversity records centre (GiGL) has classed as ‘unverified’.  The woodland here is extremely dense, but with a surprisingly good groundcover. There are, however, three clearings, two better than the other, and in each of these latter one of these insects was intermittently active. At one point the first one encountered landed on some damp mud only about three feet in front of him, but he couldn’t react quickly enough to grab a photo and it was off again. The second of them was still flying at 18.17, though by this time only the east end of its clearing was still in sunshine. There was no sign of Fritillaries here, though the larval foodplant – violets – was present.

Coppiced glades in Gatton's Plantation provide a home for White Admirals. (Photo: Chris Rose)

Coppiced glades in Gatton’s Plantation provide a home for White Admirals. (Photo: Chris Rose)

A map showing the locations of White Admiral and Silver-washed Fritillary sightings on July 23rd appears below:

http://www.bexleywildlife.org/wp-content/uploads/2016/07/WA-and-SWF-map-Joydens-Gattons-23rd-July-2016.pdf

 

The next challenge is to see whether the range of either or both species extends further into Bexley, for example at North Cray Wood, Churchfield Wood or even Braeburn Park. The habitat in the former of these looks less promising than in the latter two.

In addition, there are also claims of Brown Hairstreak at Lesnes and in the Woodlands Farm area to be investigated ……

(Chris Rose)

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Danson Park records June 2016

Thanks as always to John Turner for sharing his observations.

Danson Park records 06/03/2016 13/6/16 28/06/16
a.m. a.m. a.m.
Great-crested Grebe 4+1juv 4+1juv 2+3juv
Little Grebe 4 1 3
Cormorant 1 1
Heron 1 1 1
Mute Swan 2+6juv 2+6juv 2+5juv
Canada Geese 32 28 10
 Grey Lag Goose 1
Grey Lag/Canada 1
Egyptian Goose 2 9 1
Mallard 82 49 58+15juv
Tufted Duck 2 3
Pochard
Sparrow Hawk 1
Kestrel
Moorhen 10 5 8+3juv
Coot 20 33+1juv 50+10juv
Black-headed Gull 1
Common Gull
Yellow-legged Gull
Lesser Black Backed Gull
Herring Gull
Wood Pigeon 19 15 3
Stock Dove 6 2
Collared Dove 1
Ring-necked Parakeet 21 4 1
Kingfisher
Green Woodpecker
Greater-spotted Woodpecker 1
Nuthatch
Pied Wagtail
Grey Wagtail
Wren 8 2 4
Dunnock 2
Robin 9 5 3
Blackbird 11 7 4
Mistle Thrush
Song Thrush 2 1
Blue Tit 5 1 1
Great Tit 5 1 1
Coal Tit
Long-tailed Tit
Starling 18
Jay 1
Magpie 1 1
Crow 61 59 28
Jackdaw 1
House Sparrow 3 1
Chaffinch 6 1 1
Greenfinch 2
Goldfinch
Goldcrest 1
Chiff chaff 1 1
Blackcap 4 2 1
Willow Warbler
Swallow
House Martin
Swift 12 6 2
Grey Squirrel 1 2 4
Brown Rat 2 2
Fox
Tortoiseshell
Brimstone
Orange Tip
Large White
Speckled Wood
Common Blue
Comma 1
Small Skipper 1
Emperor 3
Broad-bodied Chaser 1
Common Blue Damselfly lots
Blue-tailed Damselfly lots
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