2017 in Invertebrates

Bees and butterflies have had a blog post to themselves, but here are a few other invertebrate encounters from 2017 I thought I’d share on the penultimate day of the year!

Wood Ants

These were taken in Great Wood in the Quantock Hills. We spent a while being amazed at the ability of these tiny creatures to pull twigs and other materials into position around their nests, joining others to give assistance where required or simply tugging with amazing tenacity until they got where they were going. Soon we also noticed the guard ants, who were trying their hardest to intimidate us into backing away and leaving the nest in peace!

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Great Diving Beetle – Dytiscus marginalis

We came across this beast when doing great crested newt surveys in the springtime – the bottle traps used to catch and count the courting newts also work for other species such as this, one of our largest beetles. They can have quite a nip, so I’m told, so this one was handled with care before being returned to its pond in a pasture field.

Great diving beetle - Dytiscus marginalis

Sawfly in a buttercup

I came across this little sawfly – its head dusted with pollen – settled in a buttercup flower in Muston Meadows in early summer. It didn’t move as I got into position to take a photo, and I could only assume it had settled there for the night.

Sawfly settled into a buttercup flower to spend the night

Wasp – Gasteruption jaculator

This amazing looking creature was feeding on the fool’s water cress flowering at the edge of our garden pond. The amazing ovipositor is so much larger than the wasp itself which made it look for all the world like a radio-controlled insect as it flew between flowers!

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Wasp – Ectemnius sp.

I came across this little wasp feeding on the hogweed flowers on a walk through Cheddar Gorge and thought it deserved a portrait – the rounded head with the eyes wrapped around looks as though it could have been the inspiration for a number of sci-fi aliens!

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Ornate-tailed digger wasp – Cerceris rybyensis

I was walking through the Hills and Hollows above Grantham one afternoon and came across a series of holes in the bare earth – I watched a while and saw several heads peeking out before one of the insects arrived from outside and I could get a proper view. This is a species of digger wasp whose prey is bees such as this solitary bee held beneath its body. The wasps bring the bees back and pull them underground to provide food for their larvae.

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Darter dragonfly – Sympetrum sp.

This dew-bejewelled dragonfly was resting on a flower stem in Muston Meadows in August. Taken just after sunrise, this shows the roosting behaviour where the dragonflies will find a safe place to spend the night, waiting for the sun to warm them in the morning and get them up to temperature so that they can take to the wing once more.

Snail

This little snail was crawling across the roof of my car when I got back from a dawn bat survey in late summer. I’m not sure how it made its way all the way there, but I liked the reflection in the early morning sunshine. I popped it back into the vegetation in the verge before heading home!

Wolf spider (Lycosidae)

This photograph was taken in the Grantham Hills and Hollows in late summer as the grasses were beginning to turn from greens to browns. I had bent down low to get a photograph of one of the wildflowers, and then my eye was caught by how many invertebrates were active just in the grasses beside it.

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Grasshopper

This grasshopper was taken on the same afternoon as the wolf spider above – I’m afraid I haven’t attempted an ID on this little character but would welcome any suggestions! The camouflage of this grasshopper amongst the greens and browns of the aging summer grassland meant I only spotted it when it hopped to another location.

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Minotaur beetle – Typhaeus typhoeus

This amazing beetle was trundling across a forest path in the Quantocks in autumn. Despite the fearsome looking horns, they are not predatory but are in fact a species of dung beetle which feeds on rabbit droppings amongst others. They nest in deep tunnels and will pull the dung back down with their powerful legs in order to provision the larvae.

 

 

 

 

Squamish – Sea to Sky

We’ve just returned from an amazing couple of weeks spent on and around Vancouver Island in British Columbia and I’m still processing all the sights and experiences. Vancouver island is extensive, BC is huge and Canada is just colossal – I’m aware that we only scratched the smallest surface of this stunning destination but I thought I’d share below a few of the highlights from the trip. First stop, Squamish!

This town is nestled between the mountains and the sea and claims the title of ‘the Outdoor Recreation Capital of Canada‘. I can see why… whilst my fingers itched to join the climbers scaling boulders and pitches all around, we had only a few days and there was adventure enough without taking to the vertical!

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A view of the Strawamus Chief, taken at sunset from Smoke Bluffs with Squamish town nestled below

The Strawamus Chief hangs above the town and we were lucky enough to have a perfect view of this iconic mountain from our window. At night you could watch the stars wheel overhead whilst mornings would see the peak revealed or otherwise concealed by rolling clouds which permitted glimpses in silhouette before billowing it back into obscurity.

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Starlapse over the Strawamus Chief

We walked the Chief trail which can take you up to all three consecutive peaks of this enticing prominence. Although time conspired against a view from the peak, the route up from Shannon Falls was spectacular – a combination of natural path and the built elements such as log-steps and boardwalks required to surmount the otherwise impassable. The forest which hugged the base and through which the path ascended was our first real view of the eerily beautiful bryophyte-hung conifers which we were to become familiar with over the next few weeks.

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Shannon Falls etching its way through the deep conifer forests which crowd around it

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A grey second day took us out along the Mamquam river which empties into the Sound at the foot of the town. The salmon runs were just beginning and we walked through the gravel banks amongst saplings and driftwood to watch their backs breaching the ripples as they spawned in the shallows.

These runs bring the eagles in the winter where thousands can be seen taking advantage of the fish – the record count in 1994 was 3,769! Sadly we were a little too early  as they peak in November.

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The humped back of a spawning male pink salmon (Oncorhynchus gorbuska) breaching the water in Mamquam river.

The salmon die after spawning and we saw many dead along the gravel banks, as well as failing and foundering in the river itself. This seemed a sad sight, but the runs of salmon from the oceans to the rivers, and their subsequent demise in freshwater, are a vital ecosystem function in transferring nutrients from one location to the other. The fish are caught or scavanged by a wide variety of species, from bears and eagles to mink, otter, gulls and vultures. This is transferred to the land through droppings, but also manually moved by bears in particular who will take the fish into the forest but often feed only on the most select parts, leaving the rest to be scavanged or simply to break down and decompose. One study in south-eastern Alaska found that up to 25% of the nitrogen in the foliage of trees was derived from spawning salmon which makes this miraculous migration a key component of the forest ecosystem.

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One of the many salmon carcasses which contribute to a vital upstream flow of nutrients

Our stay backed onto Smoke Bluffs and we took a couple of walks in the trails which weave through this forest. With huge boulders scattered amongst the conifers, and no shortage of mountain bikers willing to throw themselves down them, the trails were somewhat more challenging than the average stroll through the woods but all the more exciting for it. Whilst the evidence of others was apparent, we found ourselves alone; the sense of stillness and quiet in those woods was unlike everything I’ve ever experienced, shielded by high canopies above with all sounds softened by the sea of ferns which lapped the edges of the trail. Down low too were some beautiful lichen forests, emulating their larger neighbours in miniature.

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Lichens growing within a bed of moss upon the rocks in Smoke Bluff park

One our last day, before heading on to Horseshoe Bay to catch the ferry across to Nanaimo, we caught the Sea to Sky Gondola for a bird’s eye view of the landscape. Sea to Sky is the name of the route and the region, and it’s not hard to see why – the view from the 885m high peak out across Howe Sound shows what a stunning combination of the elements this place is!

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The view out over Howe Sound from the top of the Sea to Sky Gondola

At the summit station were creatures which I first thought to be butterflies, but on closer inspection realised were grasshoppers. I think these are Trimerotropis species and their sustained bouts of flight were unlike any I have seen our UK species do. These noisy ascents would last 10 seconds or more and had the air of a display about them – this is something which females of the genus are known to do when receptive to mating. Whilst conspicuous on the wing, they were perfectly camouflaged against the rocks, disappearing if you took your eye off them only to reappear precisely where you left them!

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Trimerotropis grasshopper on the rocks at the Sea to Sky summit

Next stop – Vancouver Island!