Wednesday, 19 September 2018

Goat Meadow moth trap - Sept 2018

It was the end of a long week, and I was still suffering from a CRTI (Crisp Related Throat Injury) due to a temporarily lodged Salt & Malt Vinegar McCoys. However, as one not inclined to moan, I soldiered on to join Jake Everitt of Sussex Moth Group for an evening moth survey. 

At around 7.30pm we set up a generator and light trap over at Goat Meadow, a herb-rich patch of grassland east of the woodlands. There are good reasons to monitor moths, as both the adults and caterpillars are important food sources for birds, predatory invertebrates, small mammals and bats. Moths are also indicators of local habitat conditions, as they are heavily dependent on a range of plants for their caterpillars and the adults which feed on nectar (making them effective night-time pollinators).

Evidence of chainsaw fairies out on site again

We had time for a site walk-over in the dusk, which was an opportunity to show Jake how the meadow has changed in the past year under management by Tom's conservation volunteers. Our groups have been working hard to reduce the amount of dominating willow scrub while opening up more of the valuable, species-rich grassland areas. 

The temperature dropped to around 14 degrees celsius, but otherwise the night was wind-less and peaceful; we were surrounded by nocturnal wildlife including feeding Pipistrelle bats and calling Tawny Owls

The Sallow Xanthia icteritia

Back at the light trap, and the moths were starting to gather in good numbers. Macro moths have some of the best (and most ridiculous) common names in natural history; many of those coming in were types of 'Sallow' moth. As we finally emptied the trap out at about 11pm, I collected a few up to photograph the next day...

The SallowXanthia icteritia

Barred SallowTiliacea aurago

Centre-barred SallowAtethmia centrago

And for the last one of the set.... I was too slow on the shutter :-(

Pink-barred Sallow - Xanthia togata 
(was 'ere)

Jake's highlight were the Oak Lutestrings which turned up towards the end.

Oak Lutestring - Cymatophorima diluta

Eudonia angustea (a type of micromoth)

Common Marbled Carpet  - Dysstroma truncata

Not only moths are attracted to the light, here is a selection of the evening's by-catch:

European Hornet - Vespa crabro

Great Blackclock - Pterostichus niger

Night-flying Dung Beetle - Aphodius rufipes

Green Shieldbug - Palomena prasina

Not a bad count in all for a September evening, and typically for this time of year Square-spot Rustic were in the greatest numbers.

Common Name
Scientific Name
Total Count
Aleimma loeflingiana
Aleimma loeflingiana
Epinotia ramella
Epinotia ramella
Epinotia cinereana
Epinotia cinereana
Eudonia angustea
Eudonia angustea
Oak Hook-tip
Drepana binaria
Oak Lutestring [sp]
Cymatophorima diluta
Common Marbled Carpet
Chloroclysta truncata
Willow Beauty
Peribatodes rhomboidaria
Light Emerald
Campaea margaritata
Large Yellow Underwing
Noctua pronuba
Lunar Yellow Underwing
Noctua orbona
Lesser Yellow Underwing
Noctua comes
Square-spot Rustic
Xestia xanthographa
Brindled Green
Dryobotodes eremita
Centre-barred Sallow
Atethmia centrago
Barred Sallow
Xanthia aurago
Pink-barred Sallow
Xanthia togata
The Sallow
Xanthia icteritia
Copper Underwing
Amphipyra pyramidea
Straw Dot
Rivula sericealis
The Snout
Hypena proboscidalis

Thursday, 23 August 2018

Gatwick Wildlife Day 2018

The Gatwick Aviation Museum is a hidden gem of a place, containing an impressive collection of well-kept British aircraft manufactured between the 1940s and the 1970s. The main building is a large aircraft hangar located in a large field, north-west of Gatwick's runway.

The landscape here is made up of wetlands, hedgerows, mature English Oak trees and margins of long grass, which combined with a lack of human disturbance results in some excellent areas for wildlife. The site also has very few biological records, and as species listing helps us to build up a picture of the ecosystem health, this is an ideal location for our 5th annual wildlife recording event!

North West of the runway

The bioblitz area

Event kick-off: Friday 22nd June, 7pm

(One day after the summer solstice.)

On the second longest day of the year, there was plenty of time before sundown for the Gatwick Greenspace Partnership team to set up the recording base camp. We readied ourselves for a long evening of wildlife discovery, which involved brewing plenty of coffee and a bit of impromptu kazoo playing.

Aviation Museum pond

It was an incredibly warm summer evening with hardly a breeze. As the first guests arrived, our task was to put the overnight moth-trapping equipment out into the heart of the site. 

Next up was the setting of longworth traps (used for live capture of small mammals) which were placed out around the perimeter of the site. As the sun finally began to set at around 9.20pm, Martyn Cooke and Kevin Lerwill began the bat activity survey. 

Static bat recorder

Martyn's specialist bat recording software produced over 3000 sequences, and approximately 25,000 individual bat calls. Three species were positively identified; Common Pipistrelle, Soprano Pipistrelle and Noctule. Two species of Myotis bats were recorded, and noted as probable Bechstein's and Whiskered. A possible Leisler's bat flagged up, but was unfortunately the recording was quite poor.

Total bat species: 5

By the evening's end we had gathered many wildlife records of the nocturnal kind, including several species of amphibian, bats, spiders, and a very vocal Tawny Owl

Common Toad Bufo bufo

Common Frog Rana temporaria 
(Photo by Helen Cradduck)

Total amphibian species: 3

A beautifully polished Walnut Orb-weaver Nuctenea umbratica

Around midnight it was time to put the kazoos away and turn in for an ambitious attempt at getting some shut-eye next to an airfield. 

Saturday June 23rd: 6am

(Photo by Lucy Groves)

The sun popped up again much sooner than we would have liked, and the team was mobilized at 6am. The first task of the day was a bird survey, which involved walking the entire perimeter of the site, keeping a sharp eye out and listening for calls.

The areas of wet scrub proved very productive, and we were greeted by the sounds of Reed BuntingGoldfinch and Common Whitethroat. Along the mature hedgerows and Oak trees, the most vocal birds were Nuthatch and Song Thrush.

Common Buzzard Buteo buteo
(Photo by Helen Cradduck)

Total bird species (seen and heard): 32

After the birds, it was straight on to checking the small mammal traps, with local mammal expert Lucy Groves leading the group. We found 5 species of small mammal which we considered good going for a short survey; Wood Mouse, Yellow-necked Mouse, Bank Vole, Common Shrew and Pygmy Shrew.

Wood Mouse Apodemus sylvaticus 
(Photo by Lucy Groves)

Larger mammals which were also seen on site included Rabbit, Red Fox, Roe Deer, Grey Squirrel and Brown Rat.

Red Fox Vulpes vulpes 
(Photo by Helen Cradduck)

Total mammal species (not including bats): 12

After a quick breakfast and some fresh pots of coffee, next up was the moth trap reveal with Laurie Jackson and Bob Foreman leading the show. The overnight traps were emptied with every moth, large and small, closely examined for identification and then counted.

Elephant Hawk-moth Deilephila elpenor 
(Photo by Helen Cradduck)

We were looked on by the yellow-and-black caterpillars of the Cinnabar moth, making short work of the Common Ragwort growing nearby.

But the rarity of the day (which caused the most excitement in the mothers' world) was the Dotted Fan-foot Moth, a nationally scarce species...

Total moth species: 68

Late morning rolled in (along with a fresh lot of guests!) and we sent out the troops out with their sweep nets, chasing down the numerous invertebrates out on the wing and hiding up in tall vegetation.

Banded Demoiselle Calopteryx splendens
(Photo by Helen Cradduck)

Total dragonfly & damselfly species: 7

Vince Massimo carried out a survey around the perimeter of the site, giving our butterfly species list a boost. The most rewarding find for him was a Purple Hairstreak high up in the canopy of the oldest Oak Trees.

Large Skipper Ochlodes sylvanus 
(Photo by Vince Massimo)

Small Tortoiseshell Aglais urticae 
(Photo by Vince Massimo)

Total butterfly species: 17

Other invertebrate groups can be a great challenge to identify to species level, so we were lucky to have experts on site such as Peter Hodge who did a brilliant job of sorting out the beetles for us...

A species of Soldier Beetle - Cantharis rufa

Cantharis nigra

A tiny lacewing larvae

Labyrinth Spider Agelena labyrinthica

Total beetle species: 42
Total spider species: 7
Total fly species: 16

And not forgetting the plants and fungi, with specialists Nick Aplin, Clare Blencowe, Brad Scott and Arthur Hoare helping to cover these challenging groups...

Arthur Hoare in action

Marsh Thistle (Cirsium palustre)

Total vascular plant species: 59
Total lower plant species: 6
Total fungi species: 14

The final part of the day involved pond dipping for aquatic invertebrates. We are able to identify a few of the dragonfly nymphs and water bugs, as well as getting up close to the young frogs and newts.

Dragonfly nymph 
(Photo by Lucy Groves)

Newt larva
(Photo by Lucy Groves)

By the end of the day, at about 2pm we had our running total, but it didn't stop there with experts taking away notebooks and specimens for closer examination.

This was the total count at around 2pm

As of now, the grand total for the day stands at 323 species!

A huge thank you to Tom Simpson, Kevin Lerwill, Tamara Jewell, and to all of the volunteers and guests who attended on the day. A special thank you also to Ashley and Jon of the Gatwick Aviation Museum for allowing use of their excellent site and facilities.

The latest breakdown of group totals from Lois Mayhew at the Sussex Biodiversity Record Centre:
moss and lichen6
true bugs27
hymenoptera6 (includes 1 gall)
Grasshoppers and crickets3
Total Species323
Total Records423