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Tag Archives: day-flying moths

The Butterfly Effect

31 Saturday Jul 2021

Posted by theresagreen in Butterflies of Wales, Limestone hills, Nature of Wales, Nature Walks, North Wales, Wildflowers of Wales

≈ 4 Comments

Tags

black & yellow striped caterpillars, brown and orange butterflies, Bryn Euryn Nature Reserve, butterflies in long grass, day-flying moths, late summer wildflowers

Just a few short short weeks ago things weren’t looking too hopeful for our summer butterflies; the cold, damp start to the season had kept their numbers low and every sighting of any species was gratefully received and shared on social media. With many species already in decline, the predictions for the success of this year’s summer broods were edging on pessimistic and on many days, when out on walks I didn’t see a single one. Half-way through this month, a guided ‘Butterfly Walk’ was scheduled by a friend that regularly records the butterfly transect around Bryn Euryn, the limestone hill in North Wales which is at the centre of my ‘patch’. In preparation he’d done a recce the day before and his sightings were so few that he put out a warning that evening suggesting people may want to postpone the event and try again in a week or two! No-one cancelled, probably as most of are of an age where we’re not constantly checking our emails or social media sites, and about 20 of us gathered as arranged. Perhaps we were also a little giddy with the excitement of our very recent release from some of our Covid 19 restrictions (Wales has been a tad more cautious than England), and this was the first time we’d been allowed to meet up outside of Zoom since lockdown began. So in the spirit of ‘mad dogs and English/Welsh men and women’, we set off on this boiling hot Sunday afternoon (the beginning of the heatwave) to walk up to the top of the hill, 430 feet (131m) closer to the sun in the hope there’d be at least a few butterflies putting on a show for us.  

Long grass on the cliff-edge providing perfect habitat for meadow butterflies

Of course it was well worth the effort, or I wouldn’t be mentioning it; in the space of 24 hours the butterfly species count had magically rocketed from practically zero to most of those we’d expect to see here on a good day at this time of year, plus day-flying moths The count for each species wasn’t high, but the majority of those we saw were fresh and all were highly mobile and in a group that size, numbers of pairs of eyes meant we didn’t miss seeing much. But the best part was watching the effect these particular insects have on people of all ages; some excitedly enjoyed the first sightings of rapid-flying Dark Green Fritillaries while others crouched down around a plant to witness the mating of a pair of Small Skippers. All captivated by the fluttering of wings and for a few magical moments, completely absorbed and transported into another dimension. Butterfly chasing should definitely be put on prescription!

  • Small Heath
  • Meadow Brown on Small Scabious
  • Small Skipper mating pair

Although I’d thoroughly enjoyed the company and butterfly sightings seen by the group, I’d missed photographing the fabulous-but-flighty Fritillaries, so as the hot weather seemed to be holding, I wanted to go around again at my usual meandering speed and a couple of days later I set off to see if I could fill in the gaps. This time I wandered up through the woods where the paths and trails are shaded and it’s a pleasant degree or two cooler than out on the open hillside, which surely has to be one of the best reasons for planting more trees in a warming climate. 

A lovely fresh Comma and its shadow were a great start to my walk
Woodland paths are edged with False Brome grass

Now the tree canopy is more or less closed and limiting the light reaching the ground, flowering plants are scarce and as the earth dries out any that aren’t designed to cope quickly wilt. Built to withstand such conditions, one exception is Wood Sage, whose flowers seem particularly suited to Common Carder bees. Nipplewort, an annual plant with tiny yellow flowers and slim wiry stems always seems to find a few agreeable spots along these paths too.

  • Wood Sage with Common Carder
  • Nipplewort

As always I stopped at the fence on the woodland boundary to look out over the meadow on the other side. The long grass was cut on a mild, sunny day back in January this year, which at the time I remember thinking seemed like a strange time to be doing that, but it doesn’t seem to have mattered as now it’s grown tall again and I could see there’s also Hogweed and Ragwort in flower and it’s full of Knapweed in bud. I could also see it was alive with butterflies – mostly Meadow Browns as far as I could see, which was a good sign there would be more to see in more accessible places higher up. There were clearly other insects about too – my photo was ‘bombed’ by what could be a wasp or maybe a hoverfly!

Meadow with long grass and butterflies

Stepping onto the Woodland Trail that circuits the Nature Reserve it was hot – too hot now for insects such as hoverflies that would all be hiding away under leaves or on tree branches. Birds are mostly beginning a ‘time-out’ in which to rest after a busy breeding season and to moult their old feathers and grow new ones, so it was very quiet. The total lack of a breeze was even keeping down the ever-present traffic noise from the valley below.

Leaving the woods behind I joined the Summit Trail, more or less at the point where we’d begun the butterfly transect on Sunday. The small field here used to have a good patch of long flowery grass at this lower end, but perhaps due to more trampling and changes in the weather patterns, it’s not as good as it used to be for butterflies. Today there were a Small Skipper and a few Meadow Browns flitting about in the grass, but far more of the latter around the field edges where there is scrubby vegetation with low bushes of bramble and gorse. I  counted to roughly 30, all busily chasing about low in the grass and around the brambles, with none settling for even a quick snap. The wildflowers are a bit sparse too, some Lady’s Bedstraw, a scattering of Rockrose, a few clumps of Keeled Garlic and the odd Harebell were all there was to see. The huge spread of Hemp Agrimony is just beginning to open its flowers and on the opposite side of the field the Burnet Roses have a good crop of hips; red now, but they’ll ultimately ripen to black. One of my favourite sights now are the feathery globes of Goat’s-beard that stand like little beacons in the shorter grass. 

  • Keeled Garlic
  • Ripening hips of Burnet Rose & spider web
  • Goat’s-beard seedhead

From the open field the trail goes up through the woods again, so there’s another short break from the heat, although the slope is steep. At the top is the clifftop with the long grass and scrubby vegetation pictured at the beginning of the post, and it was here that during the last two days, butterfly numbers had increased the most dramatically. Where there had been maybe 20 or so on Sunday, now there were more than I could have counted of Meadow Browns, a good number of Gatekeepers, lots of little Small Heaths, several Small Skippers, one or two Brown Argus, a Grayling and possibly even a Dingy Skipper. Standing out amongst the crowd of brown and orange butterflies were dramatic red and black 6-spot Burnet moths. All of these species are dependent on tall grasses as food plants for their caterpillars and as adults they take nectar from flowers, so where there’s a good area of long grass with wildflowers in it, they don’t need to move far. 

6-spot Burnet Moth on Creeping thistle

The hot sunshine had coaxed more flowers into bloom too, particularly the blue-lilac Scabious, which is a favourite of butterflies and of many other species of insects too. 

  • Sulphur beetle & Red Soldier beetle
  • Meadow Brown
  • 6-Spot Burnet moth

On a cooler day I would have lingered longer around this one spot and doubtless found even more than I did, but the heat out on the open hillside was intense, and if I was to find Fritillaries I had still to get up to the summit and down the other side of the hill. When I first began exploring this hillside, back in 2012, the management of it was quite different; the long grass would have been kept shorter and Ragwort considered a noxious weed and kept at bay. Gradually attitudes have changed and over the years the plant has spread considerably and a result, as well as providing important nectar and pollen for invertebrates, the numbers of plants supporting the unmistakeable black and yellow striped caterpillars of Cinnabar moths has also increased; some plants had several, others one or two. 

  • Cinnabar moth caterpillar
Walking up towards the summit Ragwort plants became the most obvious sources of nectar for butterflies, moths, bumblebees and the occasional hoverfly.
  • Gatekeeper-Pyronia tithonus
  • Gatekeeper-male showing scent scales on forewing
6-Spot Burnet moths mating above a newly-vacated cocoon

Going down the other side of the hill it was Burnet moths that dominated the airways, flying low in, over and about the grassy slope. Many would have been newly emerged from their alien-pod like yellow which are frequently seen attached to grass and other plant stems. Often there is a mass emergence, with males emerging first. They then sit above the cocoon of a female and wait for her to emerge, pouncing on her to mate before she’s barely had time to draw her first breath of fresh air.

Amongst the grass on this side of the hill you can find some of this site’s loveliest wildflowers, Common Spotted Orchids; most are at the end of their flowering now, but while following one of only two Dark Green Fritillaries I saw today I found a few fairly fresh ones. There was some Dropwort too, the dry limestone grassland relative of the similar-looking moisture-loving Meadowsweet.

  • Dropwort
  • Common Spotted Orchid

On the other side of the trail, where the hillside is left much to its own devices a lovely pink-purple haze of Rosebay Willowherb stands out against a backdrop of trees. 

Rosebay Willowherb

Despite my best efforts, I didn’t get my photo of a Dark Green Fritillary, but it was too hot to chase about, so I sat on the grass for a short while and enjoyed watching those I saw; they are impressive – and very fast on the wing! Luckily I have a stack of photographs taken on other occasions in this exact spot, so here’s one I made earlier.

Dark Green Fritillary on Scabious

As so often happens, there were compensations; close to where I’d stopped a Brown Argus landed on Ragwort and another fresh Gatekeeper on nearby Hemp Agrimony.

  • Brown Argus on Ragwort
  • Gatekeeper on Hemp Agrimony

Then as I was about to turn and head back home, my favourite of all the summer butterflies, a perfectly beautiful little Small Copper landed first on a stone at the edge of the trail then flew up to a nearby Ragwort; my first sighting of one this year and a perfect note to finish on.

  • Small Copper
  • Small Copper on Ragwort

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Tiny Tree-top Dancers

03 Sunday May 2020

Posted by theresagreen in day-flying moths, Insects, Nature of Wales

≈ 5 Comments

Tags

Adela reamurella, black insects swarming around trees, day-flying moths, green long-horn moth, insect behaviour, metallic insects with long antennae, Wych Elm

Every year, from around about the end of the third week of April, I begin to watch out for the arrival and mass gatherings of insects I find particularly enchanting; the strangely beautiful day-flying Green Longhorn Moth. Their arrival and group dancing displays have become one of the highlights of the Spring for me, not just because they are entertaining to watch, which they are, but equally as this is an event that occurs at this same point in time each year. In changing times it’s reassuring to see that some elements of Nature’s complex pattern continue to repeat as and when they should, although each passing year I breathe a quiet sigh of relief when I see them for the first time, then feel the joy.

Green Longhorn Moths around an Oak tree

Seen individually and more closely, you could be forgiven for thinking this is some kind of a fly rather than a moth. Tiny insects; from outstretched wingtip to wingtip they might stretch to about 1½” (14-18mm).They have long black shaggy-looking hairs on their head and thorax, giving them a furry appearance and well-developed eyes. But then they brandish a pair of outlandishly and seemingly disproportionately long, white waving antennae, with those of males being longer than the females. Their beauty though is in their gorgeous iridescent wings. The basic wing colour is usually described as metallic green, hence the moth’s common name, but depending how the light catches them they can appear in a range of shades from bronze, through greens to violet.

There are several spots around Bryn Euryn where I have seen gatherings of the moths most years, that you could say are reliable. One is around Oak trees, which the insects are known to be associated with, and another is over an area at the edge of a Trail which is lined with more scrubby vegetation including blackthorn and gorse. Most noticeable in large groups dancing around the outer leaves of trees, sometimes high up, sometimes lower down, I have also found them in smaller groups in spots on woodland paths and even occasionally alone.

Ready for take off

My own best views though take little effort on my part, as the moths gather and perform in sometimes large numbers directly in front of my kitchen window, dancing in the sunshine around the top of the Wych Elm. I took the following video, which I think gives a much better idea of how the insects look and behave in action than photographs can. My videoing is not the best, but I think anyone that has never seen this little spectacle before will get the general idea! The dancing moths are accompanied by a Blackbird singing, with a few notes thrown in by a passing Herring Gull, plus a few creaks and squeaks from my zooming camera lens which is a tad bent out of shape since I dropped it….! You may also spot the odd hoverfly and a Speckled Wood butterfly.

(you can click on the video to make it bigger to get a better view)

Timeline 2020: This year I spotted my first arrivals in one small group on April 23rd. I think it’s safe to say, all males. Numbers increased over the next few days and I’m sure there have been more than in previous years, but they’d be very difficult to count! Numbers have fluctuated over the last few days, perhaps in connection with the cooler rainy weather we had earlier this week, and yesterday, May 2nd there are only a very few to be seen, in scattered small groups. But this morning they were back in force, with a lot of activity, then by 11am I couldn’t see any at all. I wondered if like with many small insects they need to stay out of the hotter direct sunlight.

Despite some careful watching, I don’t think I saw any females, for whom all of this frenzied displaying is for of course.  I definitely didn’t see any mating happening, but I’m hopeful it will have and that there will be more performances to look forward to this time next year.

 

 

 

 

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‘But it is the common species that keep the living world ticking over and provide most of our experiences of wildlife, and I would argue that maintaining the abundance of these is as important a conservation priority as maintaining the existence of rarities’. Richard Mabey

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