High Fashion and Green Metal in an Essex Summer: The Lestidae Damselflies

 As it is (ed: Not long past) Christmas, and I have already written of a decidedly Christmassy species, I thought, in the dark of St Stephen’s Night, to revisit the insects with which I spent a privileged summer, through the coastal marshes of Essex. The Lestidae damselflies, or Emerald Damselflies, come in a range of shades from key lime pie green, to metallic fir tree tinsel green, some bearing a dusty blue pruinescence. They are desperately fashionable too, subject of many treatises, management plans and UK Wildlife Podcasts, in part because of their undoubted beauty, more subtle than that of the splendid Calopteryx spp - perhaps more of them later- and less easily spotted than the big Aeshnids I wrote about before. Essex is their spiritual home- and arguably one of the epicentres of their remarkable colonisation of these islands. All four breeding species are found in the county, and I had the privilege of meeting them all over the summer of 2022.

Scarce Emerald Damselfly nomming a Blue Tailed Damselfly (Ishnura elegans)

Willow Emerald Damselfy, RSPB Bowers' Marsh, Essex. 

My first encounter with these splendid creatures was a couple of years ago at RSPB Rainham Marshes, where I met a gorgeous, deep bronze green insect hanging serenely on some wetland tree that may or may not have been the one from which it took its common name. This slim and delicate creature was a Willow Emerald (Chalcolestes viridis) a stunning creature which immediately caught my eye, especially as it was October, when all but the hardiest Common Darters and Migrant Hawkers had reached the end of their season. The Willow Emerald is unique among British odonata as it does not lay its eggs in water, but instead, in neat incisions made in woody vegetation overhanging water with a modified ovipositor. I have witnessed them laying eggs like this while still in tandem, the male gripping the female with his anal claspers, protecting, or jealously guarding her. From these eggs the tiny prolarvae emerge in spring, and drop into the water below to continue their life cycle, much more typically. Any which fail to find water do not make it, but conversely, being to an extent free of the need for water during late summer oviposition offers an advantage in a drying climate.  This species was first recorded breeding in the UK in something like 2009, in Suffolk. On a September walk by the Thames at Tilbury in 2022, with my good friend Chris, we found hundreds of these beautiful, bronze green insects, hanging out on Brambles tens of metres from fresh water. It is a species which has undergone a meteoric rise. Look for an all-green Damselfly, sometimes shimmering bronze in the sunshine as the light catches its iridescence, with clear wings (mind those flashy Calopteryx!) white pterostigmas (the dots in the ‘outboard’ corners of the wings), hanging out on marginal woody vegetation near still or slow-moving water.

Willow Emerald, Tilbury, September 2022

A few years later, while walking among the ditches at an EWT nature reserve way off the beaten track yet not too far from Basildon. Hanging on a branch, apparently relatively freshly emerged, was a beautiful male Scarce Emerald (Lestes dryas). Contrary to its English name, this species seemed very numerous on the sites where it lived. A hulking brute of a damselfly, size being a key if not universally reliable way of separating it from the smaller Emerald Damselfly (Lestes sponsa), and another species identified as having a distinct upward population trend, it likes Sea Clubrush choked ditches, sometimes to the consternation of site managers irked by its insistence on enjoying exactly the habitats wading birds do not, and often co-occurs on the coastal grazing marshes also favoured by Small-Red Eyed Damselflies and Ruddy Darter Damselflies. Like all Odonata it is an active predator, adult and nymph, largely taking small flies,  but not averse to dining on its distant relatives. At RSPB Old Hall, what I initially took to be a mating pair of Blue-Tailed Damselflies, turned out on closer inspection to be a Scarce Emerald feasting on the corpse of a Blue-Tailed Damselfly. In addition to an impressive display of predation, though I had no way of telling whether the Emerald had caught its prey on the wing or simply made a fortuitously (for the Emerald) timed landing, it represented a good chance to compare the blue bits of the two species. The steel blue pruinescence, a dusting of scales which fades with age, contrasted strongly with the almost luminescent looking blue tail-light of the commoner species.  Scan through the big crowds of Blue Tailed Damselflies for this big beast, and use your close-focus bins or a good photo to identify it by the pruinescence covering the whole of the first two segments of the abdomen, and the big, bent-paddle claspers at the back end to separate from male Lestes sponsa. A slightly different pattern of green and pale cream on the thorax separates the females of these species.  Look for them in June and July, I saw few of them after the big heatwave of 2022, for reasons unknown, perhaps it baked off the adults or desiccated any late developing nymphs.

Scarce Emerald (female) Essex 2022

Scarce Emerald (Male) Essex 2022

Historically, the commonest of the Lestidae in the British Isles, and still the one you’re most likely to encounter outside of South Eastern England, is Lestes sponsa, the Emerald Damselfly, you may hear it called the Common Emerald Damselfly.   This species has undergone something of a decline of late, like many of our odonata, as documented in the State of Britain’s Dragonflies report. It is hard to separate from L. dryas, I recommend a good book with the illustrations of Richard Lewington in it and a good pair of low-magnifying small binoculars for close focus, though any particularly small Lestes-with-blue-bits is likely to be one. Sadly I encountered just a few of this species during my summer transects.

Emerald Damselfly, Essex, 2022

The fourth species is the newest, and perhaps the slowest colonising, the beautiful and distinctive looking Southern Emerald Damselfly (Lestes barbarus). This is a gorgeous, key lime pie of an insect, with its dark green metallic upper surfaces contrasting with the pale, green-tinged yellow of its undersides, boasting a unique and instantly recognisable (yes, really) bicolour pterostigma, half milk white, half blackish brown. It has distinct ‘antehumeral stripes,’ look for markings like braces on its thorax. Its stronghold is on Canvey Island, of all places, I am advised a particular ditch is a good place to look, but I found it on the site near Basildon, where it was a new record. More delicate looking than the other three, it was first recorded in Britain in 2002, in Norfolk, and it’s been gradually colonising low-lying Essex since being discovered at Wat Tyler Country Park by Neil Phillips in July 2010, with other early records coming from Gunners Park, Shoeburyness in 2012. It is a more committed climate change rebel, and habitat specialist, than even the Willow Emerald, relying on ditches drying up in late summer for oviposition. I could scarce believe my eyes when I found one near Basildon on an EWT reserve. These species are moving so fast and unpredictably with their quiet invasion that they are one group in which the observations of keen eyed amateur naturalists and local surveyors can make real changes to known distribution maps.

Southern Emerald Damselfly, EWT site, Essex. 

So think of them on these winter days, and dream of them shimmering beneath a warm summer sky. Their season will roll around soon enough. Get yourself a good dragonfly book, a good pair of bins, and, come June, go to your favourite wetlands. You may just find yourself a new favourite insect there.

Southern Emerald Damselfly

*This blog has been edited since posting to correct the timeline of Southern Emerald colonisation and credit the finder. 

The Darter Dragonflies

As I write, it is grey outside. Mild now the now has melted, but drizzling and chill. Dragonfly season is well over. But it lasted into October, even November with the mild conditions and today feels an excellent day to look back.

Ruddy Darter, male, Essex 2022

At nearly every site I surveyed, the most numerous genus of Dragonfly I encountered, especially as the season pushed on into August and September, was Sympetrum. Specifically, Sympetrum sanguineum, the Ruddy Darter, and S. striolatum, the Common Darter, the former apparently capable of surviving even mildly brackish water conditions, favouring low lying coastal marshland, occurring alongside Scarce Emerald Damselfly (Lestes dryas) and Southern Migrant Hawker (Aeshna affinis). The latter, S. striolatum, is capable of flying well into the season of mists and mellow fruitfulness and is often one of the last dragonflies on the wing. However despite their abundance, and their abundant charisma, this genus seems relatively unexplored in the popular literature.

Ruddy Darter, Male, in Obelisk position as he attempts to lose heat during the heatwave of July 2022. 

These represent the two commonest species of Sympetrum, a genus in the family Libellulidae. Both species are broadly speaking red in the adult male, and gold, fading to brown in the the females. These creatures are, like other Odonata, agile aerial predators as adults, darting from their perches and sunbathing spots to seize small insects off the wing. It is this darting habit which gives them their common name. Their larvae lurk in almost any still or slow-moving body of water you might find.

Common Darter, Rainham Marshes, October 2021

Most numerous in the low coastal marshes of Essex in June and July is the Ruddy Darter (Sympetrum sanguineum),the males vivid, blood-red as the scientific name implies, the females an eye catching straw gold. They are the smallest of the ‘large’ dragonflies (Anisoptera) typically on the wing. They tend to form an assemblage with Scarce Emerald Damselflies (Lestes dryas) and Southern Migrant Hawkers (Aeshna affinis) alongside several of the small, blue damselflies, a habit noted by Brooks and Cham in their excellent field guide, which I found reflected strongly when I had the privilege of carrying out dragonfly surveys for a conservation organisation in the Summer of 2022. The males possess something of a ‘waist’ to the abdomen and can appear club tailed. Legs are jet black and the thorax lacks distinct stripes.

Common Darter, Otmoor, Oxfordshire, September 2022

Common Darter Breeding territories are closely guarded, with adults prepared to chase away any intruders, but away from water, their habitats are different. They like to be in the sun, and pick the sunniest spot they can find, and bathe in it, absorbing the solar energy through their skin. Signage, gateposts and fencing are among their favoured perches, and here they can gather in large numbers, occasionally lifting up, briefly, to grab some passing prey on the wing, or in readiness to flee a threatening shadow, before settling back down again, usually in the same patch of sunshine from which they took off. In Autumn especially, Common Darters can be surprisingly willing to come and sit on an outstretched hand, something I have witnessed and done several times, at a few sites up and down the country. Try it one sunny afternoon. Go somewhere with abundant Common Darters, any still water with adjacent sunlit rides is a good bet, find a patch of sunshine, and hold out a hand.Perhaps these engaging insects will come and visit. Stand calmly; they are completely harmless and will not bite, and they will use you as a sunbathing and bug hunting post.

Black Darter, male, Garry, Isle of Lewis and Harris, Scotland, August 2021

Both Common and Ruddy Darter are abundant and thriving, but another Sympetrum, S. danae, the Black Darter, a specialist of acidic pools on heath and moorland, has shown significant declines in its numbers in recent years. It is still an abundant dragonfly in the somewhat specialised habitats in which it occurs. Our smallest Sympetrum, and indeed our smallest true Dragonfly, shorter than your little finger, the male S. danae is also the only entirely black dragonfly in Britain; the female is black and gold. Like their red lowland cousins they can be confiding and will occasionally perch on fingers. Another upland species, under more extreme threat of local extinction, is the White-Faced Darter (Leucorrhinia dubia), reintroduced since 2010 to Foulshaw Moss in Cumbria, a Cumbria Wildlife Trust reserve probably most famous for its breeding Ospreys. A true specialist, this beautiful insect, with a white frons and a body dappled red and black, or gold and black in the female, they spend their larval development right down among the mass of sphagnum, avoiding open water, or anywhere fish can be found. Like so many species of the North, it is threatened by peat extraction, the abandonment of traditional moorland management, and by a warming climate. The peatland habitats in which these two darters dwell represent an important carbon sink, ever growing Sphagnum, is a real asset in our fight against man-made climate change. Efforts to secure the future of these two little dragons in Britain are efforts to secure the future of our world and ourselves.

White Faced Darter, female, Foulshaw Moss, Cumbria, May 2015

So keep an eye, next summer and into the Autumn, for these species wherever you happen to wander. The two ‘red’ species so numerous here in Essex are common and widespread, flying from May into late October, even November. They are sometimes overlooked in favour of the more glamourous Aeshnids and distinctly fashionable Lestidae damselflies, but I think they have a remarkable charisma of their own.

I love South Essex

Strolling on West Canvey Marshes this morning, the flat, damp expanse of grazing marshes filling the space between the snaking mud channel of Pitsea creek, and the Canvey Way Avenue of Remembrance, as the A130 becomes when it crosses onto the “island,” and in the shadow of the huge former Coryton Oil Refinery, and its docks, I was struck by something. South Essex, you are flipping beautiful. Never change what you are.

Black Tailed Godwit at West Canvey Marshes

The water on the reserve was high, and there were puddles on the paths. These wet coastal meadows are a typical local habitat, sculpted by centuries of moderately intensive human land use, the coastal grazing marshes. The reserve is still, declare the information boards the RSPB have installed about, a working farm, and cattle graze its lush swards. The pool beside the A130 was attended by busy Black Tailed Godwits, prodding about on its grassy margins, and Lapwings stood on its banks.  The gentle mews of Common Gull, and the whistles of Wigeon, striking ducks with bold yellow stripes on tops of their heads seemed to fill the air, a winter chorus, despite the constant competition from the traffic just a few metres away.   These calls are evocative of the cold winter air, these birds have travelled from distant breeding grounds in Scandinavia, or Siberia, places compared to which these windswept marshes are relatively hospitable winter habitat.

I wander on as a trio of chirping Meadow Pipits fly overhead, more seasonal refugees from the uplands. Stonechats are here too, bold, striking and confiding. Stonechats watch you as you watch them. They seem to keep an eye on the observer, and occasionally take off to snatch one of the few insects still active in late Autumn, from the air or off the ground.  As I neared the next hide I was aware of the sky filling with birds, Godwit, all the ducks, Lapwings, and smaller Starlings, so often seen in the company of Lapwings on South Essex marshes at this time of year, and previously hidden among the long grass, all taking to the air.   Presumably disturbed by all the commotion, a Grey Heron joined them too.  They wheeled and climbed, alarm calls echoing, staying airborne, indicating the presence of an aerial predator. I could not spot one.  In the photographs of the flock the roofs of passing vans on the A130 are visible, but I was not aware of them at the time. This was wild Canvey. I sat down in the hide, and as I did so the birds began to settle again, Wigeon landing on the water en masse in front of me, hundreds of them.  A circling Marsh Harrier seemed too distant to be the cause of their collective alarm. A couple of ducks took off from the other side of the water, and a shape raced toward me across the water. I couldn’t make it out at first but within a few seconds I was eye to yellow eye with a Sparrowhawk. We seemed to hold each others’ gaze for a second as the raptor climbed a little, effortlessly, giving a piping alarm call of its own, and passed over my head, and over the top of the screen, dropping in behind a hedgerow somewhere between where I sat and the Oil Refinery, and was gone from view. I have no regrets about lacking the presence of mind to point my camera at it, that would have deprived me of the eye-to-eye moments I had with the bird, and the breathless, heart racing moment.  I hadn’t recognised the bird at first because its outline was broken by the dead starling in the hawk’s talons. This was a stunning wild predator, in a stunning wild landscape.

Flocking Wigeon, with passing traffic.

Walking down the path, between the hedges, crossing the bridge over the reed beds where a few short weeks ago Natalie and I had been watching the swallows gather to roost before their flight to sub-Saharan Africa, now long gone, I could not help but wonder at this oasis, and the beautiful, underrated part of the country into which it fits, the Estuary England, the South Essex Marshes. Like so many South Essex wildlife sites, West Canvey does not exist separately from the urban and industrial places which surround it, but merges seamlessly with them to form a wider landscape, continuous and stunning and interwoven.  It is not far from Basildon, and is one of a suite of marshes the RSPB helps to look after locally. Here and in the wider area, from Fortress Purfleet, known to the RSPB as Rainham Marshes and sitting West of the Dartford Crossing, to the wintering flocks of Brent Geese and Turnstone which hang around at high tide at the foot of Southend Pier in the East, and Wallasea and Foulness Islands beyond, both noted for their wintering raptors, these sites are settle easily into a landscape shaped by human activity along the river. So many, such as the chalk habitats at Chafford Gorges near Thurrock, once a chalk quarry, or the new invertebrate reserve managed by BugLife at Canvey Wick, home to rare bees and other invertebrates, once an oil refinery, exist on Brownfield sites, shaped by industry, and these industries existed here because of the river, connecting London with the open sea.

Stonechat on Canvey Island

South Essex, I thought, as I became surrounded by the squeaking contact calls of busy long-tailed tits around me, you are bloody gorgeous and I love you. Then I thought, oh look, a Goldcrest.

Pitsea Creek.

RSPB Leighton Moss 17th February 2013

On a day that was truly beginning to feel like spring I took myself up to my favourite wetland in the whole of North Lancashire, the RSPB’s Leighton Moss, which sits in a valley close to Morecambe Bay, in the shadow of Warton Crag, in the Silverdale AONB.  I took with me the excuse of going to look for literature, I am set to do my dissertation project up on Warton Crag, looking at butterflies in the summer.  Before I reached the car park I wondered if there was a big twitch on, such were the numbers of people lugging their scopes up the road. It turned out the only particular rarity in the sky above Leighton Moss was the sun. It had brought the people out on a sunny Sunday afternoon for sure. Although I had arrived alone this would not be a day of birding with solitude, and the reserve hosted quite a volume of people!  The sound of distant shooting also broke my tranquillity a little bit, although my inner hippy was calmed a little when a volunteer reassured me today’s shoot was for Clay Pigeons.

I paused initially at the Moss Passerine Experience, or feeding station as its more popularly known, and watched the handsome Chaffinches, looking very bright and sharply coloured in the sunshine. There was a Brambling about, a close relative of the chaffinch and relatively scarce winter visitor.  Numbers vary from winter to winter, but they are about every year, apparently displaying very little site fidelity, and they are irruptive.  When in small numbers they tend to follow flocks of chaffinches, and this, a smart female with resplendent orange shoulder flashes, was doing just that. She would appear on one of the bird feeders for a couple of seconds before being off in a blur of black, orange and white. Bramblings always have distinctive bright white rumps, which are usually a dull green in Chaffinches.

Also around the feeders were the obligatory pair of bullfinches, the male with his bright, unmistakeable pink breast, perched openly, even allowing for a couple of blurry photographs in one of the trees. The female is just as pretty but a little more subdued in markings. Bullfinches are shy birds and feeding stations like this present an unusual opportunity to get close to them. A feeder with several ports at which the birds could land on it was squabbled over by chaffinches, but the Brambling appeared able to chase them off, and among the assembled spectators getting photos of unusual combinations of passerines on this feeder  became a pastime.  Goldfinch, Robin and Dunnock were also to be seen on the feeders.

I wandered down to the public hide, in the hope of catching up with an Otter or a Bittern, both of which have been seen there, the former apparently this morning according to a lady with a posh scope.  I saw neither, but there were a couple of smart Greater Black Backed Gulls munching on a tasty looking chunk of Perch they’d managed to get their claws into. A few cormorants shared a shingle island with them, and the telescope (hooray I got my new toy back!) picked out some roosting Lapwing behind them. I moved on to the lower hide, from which one of the Marsh Harriers, an old female, could be seen quartering over the reeds. The coots were chasing each other about, and I scanned the distant flocks of Tufted Duck for Scaup, fruitlessly, although there was a female Pochard in amongst them. A pair of Great Crested Grebes bobbed and nodded elegantly at each other. I’ve only seen the famously romantic weed pass in which Grebes indulge once, and was hoping that this amorous duo might perform for the camera, but watching their elegant bobbing and mirroring display was beauty enough. On my return stroll through the reindeer-lichen and Jew’s ear bedecked trees,  I once again made the acquaintance of the friendly, and particularly gorgeous, cock Pheasant who hangs out up there.  He posed for a couple of photos before weight of human traffic on the little causeway, and an alarming pheasant out on the shooting estate next door, sent him scurrying for the shelter of the enormous reed beds.

Freindly Pheasant

Spring was again in the air as robins could be seen doing the tail cocking and chasing but not with real intent thing, indicating breeding birds sussing each other out for mate potential despite their still strong and fiercely territorial instincts.

Once back at the visitors centre I grabbed a cup of coffee, and chatted to one of the staff about the butterflies of Warton Crag. Bring on the summer, there are Scotch Argus and High Brown Fritillary in addition to the lovely little Northern Brown Argus, which I hope to help a little through the application of science this summer, to be seen! Butterflies over coffee aside, I made my way to the Tim Jackson hide, which lies at the Western end of the main reserve. I noticed a Marsh Tit on a branch as I walked through the woods. To my surprise another perched a few feet from it. The first bird darted down and into a small gap in a moss covered log, and appeared to retrieve something. It’s partner then did the same, until a chaffinch chased it away. The chaffinch was chased off by a Dunnock, which retreated when a Nuthatch arrived. The penny soon dropped that someone had placed some sunflower seeds inside the log, and it was on these that these disparate passerines were feeding. The Marsh tits returned breifly until the prettiest blue tits ever chased them off, feisty little birds that they are.  I watched for a few minutes and, even in the dim light of the woods, managed to rattle off a few photos of the passerines as they came and went, usually pursuing each other as they did so. 

Marsh Tit

The Tim Jackson hide revealed a Little Egret and another quartering Marsh Harrier, and the usual selection of ducks.  The low sun through the window made birding tricky and I decided to use the last hour of fading light to check out the pools on the salt marsh from the Eric Morecambe hide. The car park bears dire warnings of car thieves, but I parked up and wandered on anyway. The sun was setting over the flat expanse of salt marsh down to the edge of Morecambe Bay. Another Egret could be seen standing about beside the reeds, and there were numerous handsome pintail about on the water. A Marsh Harrier scattered them, but as the birds settled back in, there was a pair of Avocets among them. These beautiful black and white waders apparently breed here, beside the expansive bay. As the sun dropped below the horizon, lighting up a red sky streaked with cirrus clouds and air trails, I was struggling to separate waders in the settling gloom, but the little cluster still active consisted of two Redshank, two Spotted Redshank and a Greenshank.

I walked back slowly toward the car, with my scope slung over my shoulder. I became aware of a shape, stock still against the horizon, on top of the ridge. It was a deer. I hadn’t seen one here since my and Natalie’s encounter with one at the Moss some time ago. The animal was picked out against the red sky, and it stood stock still, presumably hoping in stillness lay invisibility. It lifted its head and shook its ears. 

 

Full Species List for 17/02/2013

Mute Swan Cygnus Olor, Whooper Swan Cygnus cygnus, Canada Goose Branta Canadensis, Greylag Goose Anser anser, Mallard Anas Platyrynchos, Teal Anas creccia, Wigeon Anas penelope, Shoveller Anas clypeata, Pintail Anas acuta, Gadwall Anas strepera, Tufted Duck Aythya fuligula, Pochard Aythya ferina, Goldeneye Bucephala clangula, Shelduck Tadorna tadorna, Coot Fulica atra, Moorhen Gallinula chloropus Pheasant Phasianus colchicus, Snipe Gallinago gallinago, Avocet Recurvirostra avocetta, Greenshank Tringa nebularia, Redshank Tringa totanus, Spotted Redshank Tringa erythropus, Black Tailed Godwit Limosa limosa, Curlew Numenius arquata, Lapwing Vanellus vanellus, Little Egret Egretta garzetta, Cormorant Phalacrocorax carbo, Great Black Backed Gull Larus marinus, Black Headed Gull Chroicocephalus ridibundus, Marsh Harrier (Circus aeruginosus) Woodpigeon Columba palumbens, Carrion Crow Corvus corone, Jackdaw corvus monedula, Magpie pica pica Starling (Sturnus vulgaris) Blackbird (Turdus philomelos) Redwing (Turdus illiacus) Robin (Erithacus rubecula) Dunnock (Prunella modularis) Nuthatch Sitta Europea, Blue tit (Cyanistes caeruleus) Coal tit (Paraparus ater) Marsh Tit (Poecile palustris) Great tit (Parus major) Brambling  Fringilla montefringilla, Chaffinch Fringilla coelebs, Bullfinch Pyrrhula pyrrhula, Goldfinch Carduelis carduelis, Greenfinch Carduelis chloris,