Tag Archives: Common Blue

The Inbetweeners: a short story of seasonal change

There is a transition. A point in-between seasons that is neither one nor the other. A chronological no-man’s land, so to speak. A seasonal limbo of…

…This is nonsense of course. Seasonality is a human construction to assist us in making sense of the passage of natural time; applying order to the highly relative flow of change.

Nevertheless, a riddle could be written: ‘when are there many swifts, but at the same time… none?’. The answer, of course, sits in the middle of our ‘summer’ holidays, but many, many weeks after the solstice. The locally breeding swifts have departed, or mostly, and the gathering flocks of swifts in the sky are passage birds.

Other birds are moving too. A south-bound Wheatear has been seen, and a number of bright Willow Warbler have been found on the patch. Far more than the one or two pairs that we believe have bred locally.

I was looking out for these, and hoping to see other passage migrants – perhaps an early returning flycatcher – when I heard a strange two-tone disyllabic call from within the lime trees in our SSSI area of the Wanstead Flats. I heard it again and again, from within the trees. I even videoed the sound (click here).

And then the tiny bird emerged from the foliage. In the morning light I thought it was a young Willow Warbler with a very odd call and missing some tail feathers, but studying the calls, it appears to be one of the young Chiffchaff from the patch.

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Common Chiffchaff (Phylloscopus collybita)

As some birds leave, and others pass through, other creatures hold on to the last strips of summer. Peak butterfly time has been and gone. But luckily not all of them have disappeared yet. I saw my first Brown Argus on the patch on Saturday (my 25th species of butterfly here) and photographed one again today…

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Brown Argus (Aricia agestis)

The diagnostic black spots on the forewing are clearly showing in this photo, which help distinguish the argus from the similar looking female Common Blue. Of course, no such difficulty exists with males – also still on the wing.

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Common Blue (Polyommatus icarus)

Seasons change. Or so we imprint on the natural flow. If you need further evidence that Autumn is coming, you should have seen some of the giant fungi that have sprouted up recently, including these:

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Unknown fungi

The art of looking closely

Recently I have started studying plants far more carefully than before. This is not so much learning about the plant, as searching for galls on the plant. Some are easy to overlook such as the tight leaf edge rolls on Common Beech caused by the mite, Acalitus stenapsis:

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Leaf edge roll caused by mite, Acalitus stenapsis

But in searching for galls, I have also started to notice other things.

At first I thought the red spots at the base of wild cherry leaves were galls. I now know they are glands, or ‘extrafloral nectaries’ to name them properly.

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If the plant comes under attack from some kind of animal, the glands exude a scent which attracts different types of animal that will likely feed on the attacking pests. This knowledge would still be outside of my awareness were it not for my interest in, and search for, galls.

I also wouldn’t have found this Swallow-tailed Moth had I not been studying the underside of leaves for galls.

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Swallow-tailed Moth (Ourapteryx sambucaria)

Nor indeed this wonderfully coloured and cryptically marked micro-moth:

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Grapholita janthinana

My new-found interest in the small has led to the acquisition of an 10X magnification eye-glass to study my quarry better.

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Two Knopper galls on acorn caused by gall wasp, Andricus quercuscalicis

To be honest, Knopper Galls do not really need magnification to appreciate them, but other galls are so tiny they really benefit from it:

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Gall caused by asexual generation of gall wasp, Neuroterus anthracinus

This year on the patch I have been hunting fruitlessly, so far, for the Brown Argus Butterfly whose wing undersides resemble relatively closely the Common Blue:

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Common Blue (Polyommatus icarus)

It is only by careful and close study that we truly get to know a species, sometimes taking such efforts to simply differentiate one species from another, such as the Dingy Footman from the Common Footman, Scarce Footman or others from the large eilema genus of moth.

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Dingy Footman (Eilema griseola)

As a birder, I have become trained in noticing subtle movements, sounds, colours, and shapes at distance. But this summer, honing my skills in looking at things more closely and carefully, has opened up wonderful new worlds.

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Male Long Hoverfly (Sphaerophoria scripta)