Nottinghamshire Glow Worms 2018
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Our coverage of Clipstone Old Quarter will now be extremely limited, as we intend to concentrate more on surveying other sites, as part of the Nottinghamshire Glow Worm Survey. The Nottinghamshire Glow Worm Survey (NGWS) is an ongoing project aimed at contributing useful distribution data on this decling species. For more information, or to contribute to the survey, please click the banner below.
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How to submit your Glow Worm records/sightings

The quickest and easiest way to contribute your records to the Nottinghamshire Glow Worm Survey, is by completing our simple online survey form on the right. The form can also be used to send in any old Glow Worm records you may have. Old records are important in helping us to determine a more accurate picture of Glow Worm distribution and how it may have changed over time.

It is just as useful if we know where Glow Worms are not found, so please remember that negative results from a site, are equally as important as positive results to the survey and will help in our mapping of the Glow Worm's distribution at the end of the survey.

Alternatively, your survey results can be sent to us directly via the post, giving details of observer, date, location, an accurate six figure grid reference and a short description of habitat type, e.g. woodland ride, grass bank, disused railway line etc. Please send your results to the following address. The NGWS 13 Day Street, Market Warsop, Mansfield, Nottinghamshire NG20 0NG

 
 
Latest results from the Nottinghamshire Glow Worm Survey 2018
Contributors to the survey 2018: Carl Cornish. Martin Dale. Andrew Fell. Jason King. Anna Kulpa. John Maxwell. Ludwik Michalek. Katie Parry. Keith Parry. Phil Parry. Dilys Pendleton. Trevor Pendleton. Richard Upright. The NGWS has had its best response ever this year. Our thanks go to all those who have taken the time to survey sites and send us their records.
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Surveyed   Site name   Grid ref   Site type/habitat   Qty   Notes   Recorder
. . .................................................... . . . ............................................. . . . .......................................................................................... . .......................
July 19th   Clipstone Old Quarter   SK606670   Former Pine plantation, deciduous woodland and grassland   1   One female recorded   TP. DP.
July 18th   Budby South Forest   SK624690   Heathland   0   No Glow Worms recorded   TP. DP.
July 17th   Budby South Forest   SK624690   Heathland   0   No Glow Worms recorded   TP. DP.
July 17th   Sherwood Heath (all site)   SK646674   Heathland   1   A single female recorded   TP. DP.
July 15th   Budby South Forest   SK624690   Heathland   0   No Glow Worms recorded   TP. DP.
July 15th   Sherwood Heath (part)   SK646674   Heathland   2   Two females   TP. DP.
July 13th   Sherwood Heath (all site)   SK646674   Heathland   4   Four females present, all located within one general area of the site centred around SK648674   TP. DP.
July 12th   Clipstone Old Quarter   SK606670   Former Pine plantation, deciduous woodland and grassland   25   All but one female found in the grass strip. A single male recorded with one female.   TP. DP.
July 11th   Sherwood Heath (all site)   SK646674   Heathland   0   No Glow Worms recorded   TP. DP.
July 10th   Budby South Forest   SK624690   Heathland   3   Three females still present along the access track   TP. DP.
July 10th   Sherwood Heath (all site)   SK646674   Heathland   0   No Glow Worms recorded   TP. DP.
July 8th   Sherwood Heath (all site)   SK646674   Heathland   9   Just nine females recorded   TP. DP.
July 6th   Sherwood Heath (all site)   SK646674   Heathland   37   Still a minimum of 37 females on site   TP. DP.
July 6th   Budby South Forest   SK624690   Heathland   7   Seven females recorded   TP. DP.
July 6th   Carburton Border   SK616731   Woodland   2   Two females recorded   LM. KP. KP.
July 5th   Sherwood Heath (all site)   SK646674   Heathland   48   48 females present over most of the heath   TP. DP.
July 5th   Budby South Forest   SK624690   Heathland   7   Seven females along the access track near the A616   TP. DP.
July 3rd   Sherwood Heath (part)   SK646674   Heathland   18   18 females found   TP. DP.
July 3rd   Cockglode Wood   SK642673   Woodland/Heathland   0   No Glow Worms recorded   TP. DP.
July 3rd   Budby South Forest   SK624690   Heathland   7   Seven females recorded along the access track running paralell to the A616   TP. DP.
July 2nd   Sherwood Heath (all site)   SK646674   Heathland   21   21 females present   TP. DP.
July 2nd   Budby South Forest   SK624685   Heathland   0   No Glow Worms recorded   TP. DP.
July 2nd   Budby South Forest   SK621685   Heathland   0   No Glow Worms recorded   TP. DP.
July 1st   Budby South Forest   SK624690   Heathland   39   A site record total of 39 females. 12 females were located along the access track running close to the A616 from the main entrance, but a further 27 were found to be in the grassy heathland between the track and the road.   TP. DP.
July 1st   Sherwood Heath (all site)   SK646674   Heathland   61   The highest numbers reported here since 207 females on 27/06/08 and 212 females on 04/07/08.   TP. DP.
July 1st   Swinecote Road, Budby   SK627688   Grass verge/heath   0   No Glow Worms recorded   TP. DP.
June 30th   Budby South Forest   SK624690   Heathland   13   13 females and a single larva, present along the site access track close to the A616.   TP. DP.
June 30th   Sherwood Heath (all site)   SK646674   Heathland   27   27 females over much of the site   TP. DP.
June 29th   Sherwood Heath (all site)   SK646674   Heathland   11   11 females recorded during a late visit   TP. DP.
June 29th   Ollerton Assarts Plantation   SK630686   Woodland/heathland   3   Three females located at SK629687 and SK632685 (two). This effectively links up Glow Worm populations at Budby SF/Swinecote Road and at SK635684 (Worksop Road), probably as far as Sherwood Heath.   TP. DP.
June 29th   Swinecote Road, Budby   SK627688   Grass verge/heath   1   A single female glowing at approximately SK627687   TP. DP.
June 28th   Clipstone Forest   SK618603   Pine plantation and grass/scrub   5   Five females and four larvae recorded from area centred around SK616602   MD. LM.
June 28th   Clipstone Forest   SK603596   Mixed woodland   0   No Glow Worms recorded   MD. LM.
June 28th   Rainworth   SK605587   Disused railway line   0   No Glow Worms recorded   MD. LM.
June 28th   Budby South Forest   SK624690   Heathland   11   11 females recorded   TP. DP.
June 28th   Cockglode Wood   SK642673   Woodland/heathland   0   No Glow Worms recorded   TP. DP.
June 27th   Sherwood Heath (all site)   SK646674   Heathland   34   34 females and two males found in slightly milder temperatures than recorded on June 26th.   TP. DP.
June 27th   Budby South Forest   SK620693   Heathland   0   No Glow Worms recorded   TP. DP.
June 26th   Clipstone Old Quarter   SK606670   Former Pine plantation, deciduous woodland and grassland   31   A total of 31 females recorded   JM. RU.
June 26th   Budby South Forest   SK624690   Heathland   9   Nine females found between SK6268868799 and SK6242069058, along the access track running parallel to the A616.   TP. DP.
June 26th   Swinecote Road, Budby   SK627688   Grass verge/heath   0   No Glow Worms recorded   TP. DP.
June 26th   Sherwood Forest CP   SK626683   Deciduous woodland with areas of heathland   0   No Glow Worms recorded   TP. DP.
June 26th   Sherwood Heath   SK646674   Heathland   11   A total of 11 females found in cool (9.5C) moonlit conditions.   TP. DP.
June 25th   Sherwood Heath (all site)   SK646674   Heathland   37   37 females found during a survey of the site, despite clear skies and bright moonlight.   TP. DP.
June 25th   Worksop Road   SK635684   Deciduous woodland   0   No Glow Worms recorded in a brief survey   TP. DP.
June 24th   Sherwood Heath   SK646674   Heathland   23   A total of 23 females reported between 22:45h and 23:45h   CC.
June 24th   Clipstone Old Quarter   SK606670   Former Pine plantation, deciduous woodland and grassland   27   A total of 27 females reported   AF.
June 19th   Budby South Forest   SK624690   Heathland   7   Seven larvae recorded   TP. DP.
June 19th   Clipstone Old Quarter   SK606670   Former Pine plantation, deciduous woodland and grassland   32   32 females found this evening, two with males. Some of the grass heath sections of this site, are deteriorating rapidly through scrub growth.   TP. DP.
June 18th   Sherwood Heath (all site)   SK646674   Heathland   41   A total of 41 females and four males counted. Females located in all parts of the heath surveyed.   TP. DP.
June 18th   Budby South Forest   SK624690   Heathland   1   A single female and 11 larvae recorded. Nine were found within very close proximity to each other and viewable at the same time. All were hunting in leaf litter under Sallows.   TP. DP.
June 18th   Swinecote Road, Budby   SK627688   Grass verge/heath   0   No Glow Worms recorded   TP. DP.
June 16th   Sherwood Heath (all site)   SK646674   Heathland   2   Two females recorded with males in attendance   TP. DP.
June 16th   Swinecote Road, Budby   SK627688   Grass verge/heath   1   A single female recorded, away from where Glow Worms have previously been recorded at this site.   TP. DP.
June 16th   Budby South Forest   SK624690   Heathland   2   Two females recorded   TP. DP.
June 16th   Sherwood Forest CP   SK626683   Deciduous woodland with areas of heathland   0   No Glow Worms recorded   TP. DP.
June 13th   Sherwood Heath (all site)   SK646674   Heathland   14   Opposing weather conditions to that of the previous night, being overcast and warm with rain. A total of 14 females and one male recorded. Glow Worms generally located in two areas of the site.   TP. DP.
June 12th   Budby South Forest   SK624690   Heathland   1   Single female recorded   TP. DP.
June 12th   Sherwood Heath (all site)   SK646674   Heathland   1   Single female recorded   TP. DP.
June 11th   Sherwood Pines (entrance)   SK611646   Pine plantation   0   No Glow Worms recorded   TP.
June 11th   Clipstone Forest   SK617641   Mixed woodland, closed canopy   0   No Glow Worms recorded   TP.
June 11th   Clipstone Forest   SK621634   Pine plantation, wide forest track   0   No Glow Worms recorded   TP.
June 11th   Clipstone Forest   SK617628   Pine plantation, wide forest track with large areas of grass heathland   0   No Glow Worms recorded. Ideal looking habitat.   TP.
June 11th   Clipstone Forest   SK617621   Pine plantation   0   No Glow Worms recorded   TP.
June 11th   Clipstone Forest   SK614615   Mixed woodland, closed canopy   0   No Glow Worms recorded   TP.
June 10th   Clumber Park (Springlands)   SK611762   Mixed woodland, grassland and scrub   10   Ten females recorded from the general area of the given grid reference.   LM. KP.
June 10th   Clumber Park (Springlands)   SK614765   Mixed woodland, grassland and scrub   1   Single male attracted to artificial lure   LM. KP.
June 10th   Hills and Holes SSSI   SK557681   Former limestone quarry   0   No Glow Worms recorded   TP. DP.
June 9th   Clumber Park (Springlands)   SK611762   Mixed woodland and heathland (unmanaged)   6   Six females recorded. Two present here on June 3rd.   LM.
June 9th   Clumber Park (Springlands)   SK613764   Mixed woodland, grassland and scrub   2   Two males attracted to artificial lure   LM.
June 9th   Clumber Park (Fenton's Wood)   SK622770   Mixed woodland, grassland and scrub   0   No Glow Worms attracted to lure, or recorded visually.   LM.
June 7th   Clipstone Forest   SK620603   Mixed woodland   1   Single female recorded from a previously unknown location, but in the general area of previous reports.   LM.
June 7th   Clipstone Forest   SK616601   Mixed woodland, heathland, grassland and scrub   4   Five females recorded. 25 females present at this location on May 27th.   MD. LM. PP.
June 5th   Clipstone Old Quarter   SK606670   Former Pine plantation, deciduous woodland and grassland   0   No Glow Worms recorded   TP. DP.
June 4th   Sherwood Heath (all site)   SK646674   Heathland   0   No Glow Worms recorded   TP. DP.
June 4th   Harlow Wood   SK555565   Coniferous plantation   0   No Glow Worms recorded   JM. RU.
June 3rd   Clumber Park (Springlands)   SK611762   Mixed woodland and heathland (unmanaged)   2   Two females recorded from this general area   LM.
June 3rd   Near Peafield Lane   SK601664   Woodland bordering arable farmland   0   No Glow Worms recorded   TP. DP.
June 3rd   Swinecote Road, Budby   SK627688   Grass verge/heath   0   No Glow Worms recorded   TP. DP.
June 3rd   Budby South Forest   SK624690   Heathland   2   Two females, a single male and a larva found along outer access track from reserve entrance off Swinecote Road, near A616.   TP. DP.
June 2nd   Sherwood Heath (all site)   SK646674   Heathland   1   Single female recorded   TP. DP.
June 2nd   Farnsfield (Southwell Trail)   SK639573   Disused railway line   0   Surveyed between car park at SK643572, heading west to SK636574. No Glow Worms recorded.   TP. DP.
June 1st   Bradmer Hill   SK598665   Woodland edge   0   No Glow Worms recorded   TP. DP.
June 1st   Near Peafield Lane   SK601664   Woodland bordering arable farmland   0   No Glow Worms recorded   TP. DP.
June 1st   Gibraltar Plantation (edge)   SK605715   Woodland bordering arable farmland   0   No Glow Worms recorded   TP. DP.
May 31st   Budby South Forest   SK624690   Heathland   3   Along outer access track from reserve entrance, off Swinecote Road near A616. Three females recorded within close proximity (10m) of each other.   TP. DP.
May 31st   Swinecote Road, Budby   SK627688   Grass verge/heath   0   No Glow Worms recorded. Females (three) last recorded from this location in 2012. Larvae found in 2013 and 2016.   TP. DP.
May 31st   Sherwood Heath (lower section)   SK647676   Heathland   0   No Glow Worms recorded   TP. DP.
May 31st   Morton Hill Farm   SK653783   Farm track, grassland and scrub/meadowland   0   No Glow Worms recorded   LM.
May 30th   Clipstone Old Quarter   SK606670   Former Pine plantation, deciduous woodland and grassland   4   Four females recorded   JM. RU.
May 29th   Clipstone Old Quarter   SK606670   Former Pine plantation, deciduous woodland and grassland   5   Five females recorded   TP. DP.
May 28th   Near Peafield Lane   SK601664   Woodland bordering arable farmland   0   No Glow Worms recorded. One female recorded from this location in 2016.   TP. DP.
May 28th   Sherwood Heath (all site)   SK646674   Heathland   0   No Glow Worms recorded   TP. DP.
May 28th   Harlow Wood   SK555565   Coniferous plantation   38   38 females present   J.K.
May 27th   Inkersall Lane   SK627609   Farm track/grass verge   0   No Glow Worms recorded   MD. LM. AK.
May 27th   Clipstone Forest   SK616601   Mixed woodland, heathland, grassland and scrub   25   A new location, near to the general area of previously reported Glow Worms. 25 females found, three of which were with males.   MD. LM. AK.
May 27th   Inkersall Lane   SK628611   Disused railway line   0   No Glow Worms recorded   MD. LM. AK.
May 27th   Bilsthorpe   SK639611   Disused railway line   0   No Glow Worms recorded   MD. LM. AK.
May 27th   Budby South Forest   SK624690   Heathland   0   Along outer access track from reserve entrance off Swinecote Road, near A616. No Glow Worms recorded   TP. DP.
May 27th   Sherwood Heath (lower section)   SK647676   Heathland   0   No Glow Worms recorded   TP. DP.
May 26th   Harlow Wood   SK555565   Coniferous plantation   3   Known healthy colony holding good numbers annually.   J.K.
May 26th   Swinecote Road, Budby   SK627688   Grass verge/heath   0   No Glow Worms recorded   TP. DP.
May 26th   Budby South Forest   SK624690   Heathland   0   Along outer access track from reserve entrance off Swinecote Road, near A616. No Glow Worms recorded. Two females and a single larva recorded from this location in 2017   TP. DP.
May 24th   Clipstone Old Quarter   SK606670   Former Pine plantation, deciduous woodland and grassland   1   Single female recorded   TP. DP.
April 21st   Clipstone Old Quarter   SK613673   Deciduous woodland edge bordering farmland   1   A single 28mm larva, found at a new location (which has been surveyed several times day and night) sited away from the main Clipstone Old Quarter population, along the edge of the forest at grid ref SK6131367380   TP. DP.
March 26th   Clipstone Old Quarter   SK606670   Former Pine plantation, deciduous woodland and grassland   1   Single larva recorded   TP. DP.
 
2018 survey reports and accounts

Edited survey accounts kindly sent to us and originally written by Martin Dale.

Sunday May 27th 2018 .. I teamed up with Ludwik Michalek again this year and accompanied by Anna Kulpa, we set out for an early survey of the southern end of Clipstone Forest (Sherwood Pines) alongside Rainworth Water. We arrived early on a pleasantly mild evening and whilst still light, decided to walk into the forest, west along a disused mineral line from Bilsthorpe that conveniently took us back over the A614 into the woods. As the light faded we descended into a deep cutting and took a well worn mountain bike track up the bank to head for the main east-west ride where Glow Worms had been recorded in 2013 by Andy Lowe.

None found there so we peeled off down a narrow overgrown path through the trees to get down to the river bank. Within no more than 30 yards, there was our first Glow Worm of the year. After taking a quick peek at the river (audible in spate with the recent rain) we headed into an adjacent clearing and placed two lures down, before heading further in over a low sward of grass and light scrub. Not but a few metres on and our second female found, followed by more and more. Great team work paid off as we fanned out to scour the transect for all we could find. Much to our surprise, a total of 25 females - three already with males.  Several larval glows were noted on our way round with one peculiar bright and rapidly moving glow under foliage fading and disappearing left us all perplexed as to what it could have been. Returning to the point where we came in, we found that no males had been attracted to our lures. We also noted that barring the first female in undergrowth on the path, all other females were located within the clearing. 

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So a new location for Glow Worms centred at SK616601 (see accompanying map of the area) and in an area of Clipstone Forest where none had been recorded before. A great night had by all and for me, particularly rewarding to be able to report my first Glow Worms to the Nottinghamshire Glow Worm Survey in some seven years of 'none-found' reports! At last, and a big surprise to us to find so many at this location so early in the glowing season. A site I will visiting regularly from now on.

Martin Dale

Thursday June 7th 2018 .. I teamed up with Ludwik Michalek and Phil Parry for a second visit to the Black Hill area of Clipstone Forest. The intention was to quickly check the transect we found 24 females in on the 27th May and then to look at other areas east and west along the line of Rainworth Water.

Our route would initially be along the northern side of Rainworth Water, before crossing over the river to the south side, to survey any similar habitat up to the riverbank and around Damside Covert.

 
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The weather was cool on the night, with a clear sky interspersed with cloud and light showers of rain throughout the evening. Phil and myself surveyed areas around SK622606 on our way to meet up with Ludwik but no glow worms were found. However, Ludwik had already made good use of time to find a single female at a new location of SK620603.

Moving on to the transect previously surveyed on May 27th, just four females were found in broadly the same area. Progress was slow due to surprisingly long grass and the Bracken having grown up in the intervening days since, and now wet with the fresh precipitation. We then headed south to cross river at what was presumed from the map to be a bridge, but turned out to be a ford, so time to get our feet wet as well!

Now on the south side of Rainworth Water we surveyed east and west along 2 open transects parallel with the river. The habitat appeared to be quite different, with high grasses and boggy areas that didn't look too favourable. No glow worms were found here and it was becoming clear that the wet and cool conditions and the late hour (now after midnight) suggested that our chances of finding any were diminishing. Maybe one to do again in better weather perhaps but the habitat was less attractive that found north of the river.

Thursday June 28th .. Teamed up with Ludwik Michalek again. We decided to survey one of the dismantled railway lines leading towards Clipstone Forest. Now part of the national cycle route, we picked it up leading north from the outskirts of Rainworth at SK605584, towards the south-west corner of the forest. Disused and dismantled railway lines seem to have gained near mythical status among naturalists studying Glow Worms elsewhere in the UK, so I was anxious to check yet another one, on my continuing quest to see if this assertion holds true for Nottinghamshire.

Access was very easy from a new build corner of Rainworth and once on the former colliery line, it quickly descended into quite a deep sandstone cutting with a mixture of tussock forming Grasses, Heather and scrub with some bare sandstone areas. After about a mile, the line met the point where Rainworth Water enters a culvert, to then head west down towards a water treatment works near to Rainworth Heath. From there we picked up the track leading east into Clipstone Forest, initially going under a concrete bridge carrying the rest of the former line north to Clipstone. Up to this point, no glow worms had been found despite some promising looking habitat in the cutting.

Passing three ponds to our left and Rainworth Water to our right, we headed into the south-west corner of the forest and quickly surveyed a small clearing under some trees. None there, so carried on to find our now familiar transect centred on SK616601 to find just one female in what was by this date, chest high bracken. Very difficult to survey leading us to conclude that there may have been many more there, that we could neither see or realistically find.

Returning to the main ride, we decided to continue surveying on our way back and were pleased to find 3 females in the bracken on the north verge of the ride and one on the south side, include one right in the middle of the path! Also much in evidence, several bright glows from larvae down in the short grass on the north verge edge. One located in torch light turned out to be just 10mm size and it was heartening to see larval hunting behaviour at Clipstone Forest, following the now familiar pattern seen at other sites locally and in captivity.

In conclusion, once again Glow Worms seem to be mostly confined to areas of the forest rather than tracks in open land. Despite surveying many disused mineral lines in Notts, I'm yet to find a single glow worm on one, but I'll keep looking. Finally a big thank you to Ludwik for again providing transport and his company on the evening.

Martin Dale

     
An end to our regular Glow Worm recording at Clipstone Old Quarter
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Nottinghamshire is fortunate in having one of the largest and most well known Glow Worm colonies in the UK. Found in the heart of Sherwood Forest, the former Pine plantation at Clipstone Old Quarter has almost become synonymous for producing the UK's earliest Glow Worms in the Spring.

We have studied Clipstone Old Quarter's Glow Worms since 2008 and spent hundreds of hours in the field, most of which have been after dark. In that time, we have learned a great deal about them, but although there is still much more to learn, it has now become physically impossible for us to continue recording there on a nightly basis.

But we do still intend to survey the site occasionally, though from now on, we will be putting most of our efforts surveying other known sites, in addition to looking at potentially new sites as part of the Nottinghamshire Glow Worm Survey.

 
 
2018 Clipstone Old Quarter Glow Worm sightings
T
Glow Worms (both adults and larvae) are recorded as follows.....L = larva ..... M = male .....F = female
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Date   Stage   Additional notes
................   .L. .M .F.   ll
March 14th   0 0 0   No larvae found in Sections A, B, C and D this evening. A relatively cool temperature of 7C was recorded from T2. Site visited from 18:00h-18:55h.
T
March 26th   1 0 0   A single larva recorded early evening, measuring just 12mm and appearing to be very thin. A temperature of 9C was recorded at T2 and the site visited from 17:05h-18:15h.
T
March 27th   0 0 0   No larvae found this evening. A temperature of 9C was recorded from T2, but it felt cooler after rain earlier in the day. Site visited from 17:00h-18:00h.
T
April 3rd   0 0 0   No larvae found this evening. A temperature of 11C at T2, but it again felt much cooler after heavy showers priory to the survey. Site visited from 18:20h-19:20h.
TT
April 5th   0 0 0   No larvae recorded. The temperature at T2 was 10C, but it again felt slightly cool, despite a fine sunny day. Site visited from 18:00h-19:00h.
TT
April 6th   3 0 0   Three larvae found in section D of the survey route this evening, measuring 20mm (x2) and 17mm. A temperature of 10C was noted at T2 and site visited from 18:40h-19:40h.
TT
April 7th   5 0 0   A total of five larvae found, including one larva hunting and attacking a Slug. The relatively small sizes indicate that most were likely to be male, measuring 15mm (x2) 17mm (x2) and one at 21mm. Site visited from 18:15h-19:25h, with a much milder temperature of 13C recorded at T2.
TT
April 8th   3 0 0   Another three larvae found in section D this evening, although one was the first dead larva to be found this year. Larval sizes were 17mm, 18mm and 20mm, a lower temperature of 9C recorded at T2 and the site was visited from 18:30h-19:35h.
TT
April 11th   0 0 0   No larvae recorded this evening. The temperature at T2 was down to 6C, feeling very cool after being dull and often wet over the past few days. Site visited from 18:55h-19:50h.
TT
April 17th   6 0 0   A total of six larvae found, including single 15mm, 16mm, 19mm and 20mm larvae, and two at 17mm. Site visited from 18:45h-20:00h and for the first time in several days after finally turning warmer. The temperature at T2 was measured at 13C.
T
April 18th   5 0 0   Five larvae found during this evening's survey, including the first larva recorded along Section A since 19/03/17. Larval sizes included lengths of 16mm, 17mm and 18mm, 20mm and 24mm. A very warm temperature of 19C recorded at T2 and site visited from 19:35h-20:50h.
TT
April 20th   1 0 0   Just a single 14mm larva found in Section B this evening, after what was another very warm, dry day. Site visited from 19:25h-20:25h, with a temperature of 17C at T2.
T
April 21st   2 0 0   An early morning visit resulted in two female larvae being found, measuring 22mm and 24 mm. Of special note however, was a single 28mm larva, found at a new location on the edge of the forest at approximately SK6131367380. This is situated along the southern edge of the forest, where it borders arable land to the west of Edwinstowe. This area has been surveyed for Glow Worms several times previously (both day and night) over a number of years.
T
April 22nd   2 0 0   Two larvae found this evening measuring 18mm and 22mm. Site visited from 18:55h-19:55h, with a temperature of 15C at T2.
T
April 26th   3 0 0   Three larvae found along Section D of the survey area this evening measuring 13mm, 20mm and 22mm. Site visited from 18:55h-20:00h, with a temperature of 11C at T2.
T
April 28th   1 0 0   A cool evening with only s single 20mm larva found in Section D. Site visited from 18:45h-19:40h, with a recorded temperature of 8C at T2.
T
April 29th   2 0 0   Two larvae found this evening, with a dead 17mm larva in Section D and a 15mm larva in Section C. Site visited from 19:10h-20:10h, with a cool temperature of just 7C at T2.
T
May 10th   1 0 0   Just a single 22mm larva found in Section B of the survey area this evening. Site visited from 19:00h-19:55h, with a temperature of 12C at T2.
T
May 19th   0 0 0   No adult females found during a survey this evening. Site visited from 22:30h-23:20h and a temperature at T2 of 9C.
T
May 23rd   0 0 0   No adult females found this evening. Site visited from 22:00h-23:00h, with a recorded temperature of 12C at T2.
T
May 24th   0 0 1   The first female Glow Worm found along Section M this evening and a few nights earlier than had been expected. Site visited from 23:10h-00:20h, with a temperature of 11C at T2.
T
May 29th   0 0 5   A total of five females found this evening. All were in the grass strip sections of B (one female) and D (four). Site visited from 22:10h-23:00h. Temperature at T2 was 14C.
             
June 19th   0 2 32   32 females found this evening, two of which had males with them. A break down of the total included two females in Section O, three in Section J, 25 in Section D and single females in C and B. Site visited from 22:30h-23:20h. Temperature at T2 was 18C.
T
June 12th   0 0 25   25 females found this evening, with a single male present with one female. A single female was present in section O, with all the other females being in the grass strip. A concentrated group of eight females were found in section C, with counts for each section being 13 in section D, nine in section C and two in section A. Site visited from 22:30h-23:30h. Temperature at T2 was 15C.
 
2018 larval size data

Following what has been the coldest Winter for a number of years, with some snow and frequent frosts, 2018 is already showing the signs of being a late season. Low daytime temperatures and often wet conditions, made it pointless beginning larval surveys any earlier than mid-March.

The first larva was recorded on March 26th, appearing rather thin after over-wintering. Early April has seen conditions become more mild and larvae have been found regularly since April 6th. This has allowed us to begin looking at the available larval size data, finding that Glow Worm larvae at Clipstone Old Quarter are continuing to become smaller. The average larval length for the same period in previous years is 19.14mm.

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Fig 01. ... Recorded larval size ranges during April 2018... Correct to April 22nd (pm)
..
    9mm-15mm larval size range   Intermediate   19mm-28mm larval size range
.. .. 9mm 10mm 11mm 12mm 13mm 14mm 15mm .. 16mm 17mm 18mm .. 19mm 20mm 21mm 22mm 23mm 24mm 25mm 26mm 27mm 28mm
Section A .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 1 .. .. .. ..
Section B .. .. .. .. .. .. 1 .. .. .. 2 .. .. .. .. .. .. .. .. .. .. .. ..
Section C .. .. .. .. .. .. .. 1 .. 1 2 .. .. .. 1 .. .. .. .. .. .. .. ..
Section D .. .. .. .. .. 1 .. 2 .. 1 4 3 .. 1 6 1 2 .. 1 .. .. .. ..
..
    9mm-15mm larval size range 16.00%   Intermediate 42.00%   19mm-28mm larval size range 42.00%
Total % .. 0.00 0.00 0.00 0.00 3.25 3.25 10.00 .. 6.50 23.00 10.00 .. 3.25 23.00 3.25 7.00 0.00 7.00 0.00 0.00 0.00 0.00
 
 
Latest temperature data and the date of the first female Glow Worm

The listed 2018 average minimum and maximum temperatures, includes the data from November 2017 to April 2018 (www.metoffice.gov.uk). Based on the current temperature values and any similarity to previous years, we were predicting that the first female Glow Worm would appear at Clipstone Old Quarter around May 29-31st 2018.

Our prediction eventually proved to be about a week out, after the first female Glow Worm of the year was found on May 24th. The fine, warm and often sunny weather, obviously speeded up pupal development, after the cold Winter had meant a late start to post-overwintering larval activity.

..
Fig 02. ... Average monthly minimum Winter temperatures 2008-2018
......
    2008/09 2009/10 2010/11 2011/12 2012/13 2013/14 2014/15 2015/16 2016/17 2017/18
November - April   2.80C 2.08C 2.35C 3.28C 1.55C 3.33C 2.93C 3.59C 3.46C 2.47C
January - April   2.80C 1.62C 3.67C 2.75C 1.05C 3.62C 2.45C 2.35C 3.50C 2.68C
......
Date of first female   27/05/09 24/05/10 13/05/11 30/05/12 08/06/13 18/05/14 23/05/15 03/06/16 20/05/17 24/05/18
 
Fig 03. ... Average monthly maximum Winter temperatures 2008-2018
......
    2008/09 2009/10 2010/11 2011/12 2012/13 2013/14 2014/15 2015/16 2016/17 2017/18
November - April   8.68C 8.04C 8.71C 9.79C 7.33C 10.29C 9.50C 10.26C 9.60C 8.46C
January - April   9.27C 7.67C 10.70C 9.75C 6.95C 10.89C 9.60C 9.30C 10.12C 8.50C
......
Date of first female   27/05/09 24/05/10 13/05/11 30/05/12 08/06/13 18/05/14 23/05/15 03/06/16 20/05/17 24/05/18
 
 
Clipstone Old Quarter survey route

Below is an arial map showing both former and current survey area and routes taken each evening. For female Glow Worms, sections O, K, J and D may again form our survey route this year. Larval surveys are made in sections A, B, C and D. The two yellow dots show the two locations (highest and lowest points on site) where the temperature is taken during the season.

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