Charismatic Megafauna

Charismatic Megafauna

No, I haven’t been chasing elephants. They’re all insects! Today the University of Reading campus grasslands were a-buzz with spectacular insects, from myriad burnet moths which went spinning away from every knapweed flower to the emperor dragonfly patrolling the margins.

Some butterflies on campus appear to be having a good year too, and I’ve seen heartening pictures pop up on Twitter from elsewhere of big clusters of small tortoiseshell and peacock caterpillars feeding on nettle. I know everything isn’t right with the world of insects but it’s nice to bathe in the illusion, every once in a while, that it is. Their saving grace may well be that numbers climb spectacularly when conditions are right.

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April Explorations

April Explorations

Having recently purchased a new and better bike pump (better in that this one actually puts air in the tyres), I decided to celebrate this weekend’s ridiculously fine weather by taking my bike out for a spin along the Kennet & Avon towpath (which conveniently passes by the end of our garden). It’s an old bike with narrow tyres and an uncompromisingly firm ride, so the loose gravel and various bumps of the path made for a bone-shaking ride. Still, I had forgotten how perfect cycling pace is when you’re trying to get somewhere. Fast enough to fly past anybody on foot and make genuinely quick progress, but still slow enough to enjoy watching the world go by.

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The Kennet & Avon canal at Marsh Benham

After just five minutes I passed the entrance to Speen Moors, our most local area of ‘unimproved’ land in the Kennet River valley. A couple of minutes later I slunk under the Newbury bypass and out into proper open countryside. The air smelled deliciously fresh. Dandelions, prolific of late, lined my way, and a male orange-tip butterfly floated past every 100 metres or so. Having left Newbury’s lawnmower chorus well behind, I only heard the breeze and chiffchaffs, plus the occasional willow warbler in full sun-revelling song. Bliss. Well, apart from the bone-shaking.

I had no particular destination in mind, but decided to jump off at the entrance to Hamstead Park, an old estate we first came across on a walk at New Year. Immediately you get a feeling that there’s terrific habitat in there, especially for invertebrates that feed on dead wood: the park is dotted with veteran trees in various stages of decay. Recovering from the ride and cursing the moment I forgot to put a bottle of water in my bag, I spent half an hour in the shade of the nearest trees, two avenues of surprisingly aged sycamores. I don’t recall seeing sycamores this big before.

I remembered there is an old record for the site for the cobweb beetle, Ctesias serra, so named because its larvae tend to forage from spiders’ webs in cracks in old trees. Plenty of the sycamore had accessible cavities, so I had a poke around and eventually found a larva that was clearly in the right family (Dermestidae, like the carpet beetles commonly found in houses) but didn’t have the dense tufts of hairs Ctesias has. Perhaps they’d fallen off? No, it turns out that the larvae of Megatoma undata, another species in the same family, resemble a cobweb beetle without tufts. Adult Megatoma are attractive black and white beetles that I’ve only seen once, though they’re said to visit spring flowers.

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Probable larvae of Megatoma undata

I did find one species of invertebrate with tufts of bristles at its rear end, but it wasn’t a beetle. Indeed, not even an insect. The bristly millipede (Polyxenus lagurus) does a good impression of a beetle larva but gives the game away when it moves – ponderously trundling on a carpet of tiny legs that clearly numbers more than six. This is only the third time I’ve seen this species, but it’s swiftly becoming a favourite. So, a good omen for Hamstead Park. In the unlikely event I have significantly more free time in the next year or two, I might find out who the owner is and ask for permission to put up some traps. Or perhaps have a student on the forthcoming Entomology MSc at Reading take it on. Hamstead seems to be fairly off the radar, though there is a set of Natural England records from 1987, so it’s perhaps high time somebody gave it a closer look*.

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This odd looking beast is the bristly millipede. Very cute! 

*If you’re reading this, know the site very well and have recent records, I’d be very happy to hear from you and be put right!

Alien Shrimps

Alien Shrimps

Back in January I dug a few pitfall traps in my garden. These are simply plastic cups set flush with the ground and covered with a lid to keep rain out. The lid also serves to block larger animals – vertebrates like mice or frogs – for what I’m interested in catching here is ground-dwelling invertebrates. The traps can be filled with preserving fluid, but in my garden I’ve kept them dry so I can retain any specimens I particularly want to look at whilst letting anything else go.

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A cunningly concealed pitfall

Beetles are the most common target of a pitfall trap. So far, all three traps have added species of beetle to my garden inventory. On the one occasion the trap set in the middle of the lawn* flooded, an individual of the mostly subterranean ground beetle Clivina fossor was floating in the top. It’s a curious looking mole-legged creature that twists around what almost looks like a ball-and-socket joint between abdomen and thorax, all the better to contort through small gaps in the soil.

My latest trap round turned up no beetles whatsoever, but when I tipped out the contents of the raspberry bed trap I immediately noticed something pinging about like a rubber ball, much too large to be one of the usual springtails. Flattened from side to side and with a variety of legs and other appendages sticking off seemingly at all angles, this was an amphipod crustacean. Wait: a shrimp, in the garden?!

It turns out there is one species of terrestrial amphipod in Britain, Arcitalitrus dorrieni. It’s an introduction from the forests of New South Wales that was first found in this country back in 1924 on the Isles of Scilly. Common names include landhopper, woodhopper and (my favourite) lawn shrimp. They’ve been well established in the south and west for some years now, mostly on the coast, but seem to be spreading. I first discovered the existence of this creature when I found them under flowerpots in our garden in Twyford, just to the east of Reading. They’re established in the London area, and have clearly made their way along the Thames valley as far as Newbury. Of course this latest leap may have been made in one go by hiding out in a plant pot in our removal van! Perhaps that’s a clue to how this species gets moved around.

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By ‘Sarah’ on Flickr CC BY-SA 2.0

The British Myriapod and Isopod group are collating records of this species and also published an informative paper last year updating the landhopper’s U.K. distribution and providing information on how to separate it from other (less common) introduced terrestrial amphipods. Dave Hubble also provides more detail on his blog. I presume it is fairly under-recorded, so why not go pick up some pots in the garden and search for this rather entertaining skipping shrimp?

*Or what I will hopefully be calling the meadow later in the year.

Coffee update (see previous entry):

Somebody at Waitrose customer service replied to say they’ve passed on my enquiry to a colleague for a full response. Nothing for a week or so. In the meantime we’ve discovered that Riverford, from whom we order a weekly vegetable box as well as milk and other bits and bobs, have just started selling a shade-grown Fairtrade coffee produced by Equal Exchange. We’ll order a bag and give it a go! 

New-ish Year (Not) Resolutions

New-ish Year (Not) Resolutions

This year my New Year’s resolution has been not to have any. January is a terrible time for fresh starts. It’s gloomy, cold and spring feels an age away. Attempting to hold myself to impossible standards would be doomed to failure. That’s not strictly true; I do have a few resolutions. Such as: drink more beer and eat more cheese. Countless wonderful examples of each foodstuff are produced just in this small country, and whilst I may still be relatively young I haven’t got forever to try them all.

I suppose I did also have one or two more noble aims. Instead of interminably thinking things over or chewing on problems for a long time, I will endeavour to just get on with it wherever possible. I’ll let you know how that one goes…when I get round to it! Another is to do more of what I enjoy. Sounds simple, but you wouldn’t believe how many of us find this a difficult thing to act on.

Now, given that this is ostensibly a nature blog I should probably come up with something more natural history oriented. Over the weekend I reviewed my pan species list and updated my tallies on the PSL website. Remembering that participants can view their rank for each different taxonomic group, as well as overall rank, I thought I’d use my relative position on each list as a handy guide to which groups I have catching up on to do, and which ones I’m ahead of myself with (i.e. I’ve seen more than I thought I had relative to my interest).

What follows may be of little interest to anybody other than me, so I’m not offended if you stop reading at this point. Thanks for stopping by, and have a nice year!

For the brave among you, I begin this breakdown with a list of PSL taxa for which I have not recorded ANY species:

Blanks

Slime moulds, protists, sponges, comb jellies, bryozoans, platyhelminths (flatworms), sea spiders

In these groups of organisms I have, therefore, raw untarnished potential. Flatworms are extremely cool but I’ve never handled many for long enough to identify them. We may possibly have an ID for one seen on the Solent coast last November, so I need to check an old notebook and photographs for that. I’ve also potentially got a sea spider to add, for which, again, I need to do some more sleuthing. I’ve certainly seen sponges, but whether any were correctly identified I can’t be 100% sure. As for slime mould, time to go find some dog’s vomit!

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Sea spider on the Solent shore at Hill head, Hampshire. Possibly the introduced species Ammothea hilgendorfi

So what have I seen?

For the following groups, I make the top 50 recorders (50 being as far down as the group rankings go). My species total is in brackets.

Ahead of Myself

Algae (15), cnidarians (5), molluscs (32), crustaceans (28), springtails (5), 3-tailed bristletails (2), hemipteroids (100), coleoptera (185), tunicates (2), reptiles (5)

Algae, cnidarians (mostly sea anemones on my list), molluscs (a fair few marine snails etc.), crustaceans and tunicates (sea squirts) I put down to having made quite a few visits to the coast with knowledgeable guides or enthusiastic friends, a good field guide and a camera. Sometimes that’s all it takes.  The next step is to try and absorb some of the species on my list and ‘earn’ them, by which I mean if I saw them again I’d recognise them straight away or know quickly how to determine which species it was.

I was fairly interested in springtails for, ooh, about two weeks in February 2013. That’s probably enough to have ‘charted’ in the top 50 given their general obscurity, and I did learn enough that I can still ID one or two species in the field. A long way to go, but at least I’ve made a start: springtails are one of those groups which I feel I ought to know something about given how ubiquitous they are.

The presence of coleoptera (beetles) and hemiptera (bugs) reflects, I think, a genuine interest. In each case there’s a long way to go before I’d call myself an expert (that dreaded word) but I am fairly comfortable identifying most beetles or bugs I come across to family without resorting to a key. A few species I know well enough to greet like old friends. It’s a satisfying feeling. I think – whisper it – I have become an entomologist!

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Pantilius tunicatus, a mirid bug.

Reptiles are the only group of vertebrates for which I chart, more by accident than design. There are only six native species in the UK, of which the only one I haven’t seen is sand lizard. If you want to see more species you’re into the realm of exotic escapes and introductions. I do think lizards are rather nice. I should go and seek out a sand lizard!

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Common lizard at Slapton Ley NNR in Devon.

There remains quite a long list of taxa for which my ranking is outside the top 50, and in many cases probably below my current overall ranking (82).

Behind the Curve

Lichens (7), fungi (36), bryophytes (2!), annelid worms (3), arachnids (13), myriapods (5), vascular plants (277), echinoderms (1), amphibians (5), mammals (33), diptera (74)

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Magpie inkcap outside the University of Reading library

For all of the above I would say I’ve made no particularly strong effort. I have some reasonable totals simply by virtue of being out there, exploring the world as a mildly curious naturalist. That’s why plants are one of my highest scoring groups; step outside and you can’t help but fall over them. It is, however, a group I’ve still not quite cracked, relying for the most part on other people’s knowledge. So I wouldn’t describe myself as a botanist just yet, though given how fundamental plants are to habitat assessment and often to invertebrate identification I’m working on it. I probably know more than I think I do, at least in terms of common species.

Odonata (21), orthopteroids (14), hymenoptera (29), butterflies (41), moths (302)

I’ve put some genuine effort into seeing species in these groups; I just have quite a way to go! If pressed I would tell people moths are among my favourite, but next to the 2500 or so moth species in Britain my current total of 302 is pretty low.

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Rosy footman: now that’s a good looking moth.

Birds (251)

Birds started this whole thing for me but I’ve seen comparatively few species in the UK, especially compared with the big list twitchers. Birds remain my first love, but what I enjoy most is knowing and caring for the bird life of the local area. Of course if a new species turns up somewhere convenient or whilst I’m on holiday elsewhere in the country I’m not likely to turn it down! I’d travel for a bee eater, though probably not too far, and I’d need a few days’ notice. What I would really like to do is catch up on a few ‘bogey’ species among those that do breed in the UK. Seeing a honey buzzard, twite, ptarmigan or golden eagle in breeding habitat would be much more satisfying than a half-dead vagrant. I loved seeing some new birds on a trip round central Europe last summer and it didn’t really bother me that much that they weren’t in the ‘right’ country for the purposes of my UK list.

Right, where was I going with this? Resolutions! I didn’t sift through the rankings to compare myself with other listers; it was more a way to measure my relative progress with the different parts of the natural world. With all that in mind, here’s what I’ll be aiming to do in 2017:

  • Get off the starting line with as many of my blank groups as possible
  • Learn to recognise a decent handful of common species in those groups where my list is currently very small
  • Consolidate and expand my knowledge for those groups I’d like to get good at (beetles, bugs and moths in particular)
  • Be confident enough with plants to allow myself the title botanist
  • Be a better local birder. I won’t add any species to my list, but I will enjoy myself!

And isn’t enjoying ourselves the main point of this listing lark, in the end? That and becoming better natural historians, to the eventual benefit of the wildlife we love. I wish all of you an exciting, surprising, wildlife-rich year ahead.

Wasps

Wasps

Since moving to a new house in Newbury we are the proud custodians of two sheds. The one nearest the house is ridiculously posh as sheds go: dry, clean and spacious with a glass-walled summer house section at one end. That part in particular is serving us well as a reading den or comfortable moth-trap hut. At the far end of our garden is a second, more dilapidated shed. When we first moved in, we noticed wasps entering and exiting at the edge of the ill-fitting doors. In the hot August sunshine they appeared as rows of glowing yellow dots, each following an identical track in and out as though slung along a wire. An active nest for sure: we let them be.

Whilst comings and goings from the shed have since tailed off, today Rebecca pointed out shallow scrapes in the wood all over the doors. Soon afterwards we caught one of the culprits in the act; wasps have been scraping the surface with their mandibles to harvest wood pulp for nest building. Elsewhere in the garden where ivy is flowering, wasps have been ever-present of late, plundering a rich bounty of nectar. The sheer mass of social wasps active in autumn makes it hard to believe that in a few weeks they’ll mostly be gone, leaving it to a handful of queens to see out the winter and found new citadels next year.

Yesterday I was leading nature walks on the Reading University campus, an official part of the Open Day. A genuine highlight was finding the entrance to two separate wasp nests, both small holes in the ground from which a constant stream of workers was emerging. I hope that seeing wasps as part of a dynamic colony (that didn’t threaten us!) helped our guests to appreciate them as interesting animals worthy of our attention and admiration. These were easy-to-reach people, however, who voluntarily decided to go on a nature walk. Figuring out how to win friends for wasps among ‘ordinary’ people who see them as a seasonal nuisance, at best, is a trickier proposition.

Live Long and Prosper?

Live Long and Prosper?

I notice a team of researchers have announced in the journal Science that a population of Greenland sharks contains individuals as old as around 400 years. A few people have raised questions (not explored in the paper) about the potential for old sources of the carbon-14 used in the process to have hung around a long time in the stable Arctic environment, making the sharks appear older than they are. Nonetheless, the ages quoted are pretty incredible if true and even if it’s an overestimate these are likely to be the oldest known vertebrates alive.

The good news for would-be explorers of the natural world marooned in rainy-ol’ Britain is that there are plenty of similar mysteries on our doorstep. We simply need to think a bit smaller! Try about 3mm long, for example. That’s the size of the beetle in the right of the picture below, taken in the University of Reading’s ‘Wilderness’ on the 2nd of August. A few more of its kind, Anaspis costai, were hanging out on the same small cluster of fading hogweed flowers.

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Mordellidae sp. (left), Anaspis costai (right), Mirid bug (above) .

I walk past the flowers in question twice a day, once in the morning between 8 and 8:30 and again between 5 and 6:30 in the evening. The following day, a few more A. costai had joined the party – about 8 – and a similar number remained present through the rest of the week. I wondered if they’d remain over the weekend. Sure enough, there they were on Monday morning. And Tuesday, Wednesday and Thursday! I say they: how do I know they were the same beetles?! For so many species of insect we don’t even have this kind of basic information. How long do they live, how far will they travel in a day, how far do they disperse over the course of a lifetime?

What I needed to have done was marked as many of them as I could on day 1, perhaps with a tiny blob of enamel paint on the tip of a wing case. That’s what my PhD supervisor Graham Holloway did back in 1987, just around the corner on the same site, with a population of Eristalis pertinax hoverflies. These beetles would make trickier subjects – they’re small and very susceptible to disturbance – so I’d struggle to match the impressive total of 1223 insects marked in the hoverfly study. It would give me some satisfaction just to mark a few, though, and get anywhere towards knowing whether my beetle friends are the same individuals day after day, feeding on the same flower head, or if they represent turnover of newly emerged adults dropping out of the scraggly oak just above. There really are mysteries wherever we look, as insignificant as they may seem in the general scheme of things.

 

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Anaspis costai still present on the same small cluster of flowers, August 10th

Spring

Spring has been in the air for a remarkably long time, considering it’s not even March yet. Now spring is not just in the air but on bookshop shelves! I refer, of course, to the lovely anthology edited by Melissa Harrison and recently published by Elliot & Thompson in conjunction with the Wildlife Trusts. The Wildlife Trust’s website describes Spring thusly:

….some of the most beautiful and eclectic seasonal nature writing – from both celebrated and new authors.

I’m delighted to say that I’m one of those new authors, still getting used to the idea of having my actual name printed in an actual book. It’s a good feeling! Though I haven’t read many of the entries yet – I’m saving it up to use as piece-a-day sort of read throughout the spring months – I can vouch for the quality of those I have dipped into, and happily the book has been receiving very positive reviews. So, it is both my duty and joy to say: why not pick up a copy of Spring?

For those based relatively near to Berkshire, I’d also recommend a spring visit to Moor Copse, the BBOWT nature reserve that inspired by piece about wildflowers.