Friday 31 July 2015

Time of plenty and more to come

The end of July - plentiful food for all on the Riverside, with signs of a good autumn to come.
Brambles in the sun have ripening berries whilst those on shadier banks still have flowers providing a good source of nectar for butterflies:


A Gatekeeper butterfly finds nectar from bramble flowers in the
midday shade -
then it is challenged by a foraging Speckled Wood butterfly which
takes over from the Gatekeeper which flies off to another flower.


Speckled Wood butterfly takes over

In the sun there are more bees than ever before here on the wild field, foraging on the flowering thistle:


White-tailed Bumblebee (Bombus lucorum)
on a thistle flower in the hot sun, covered in pollen.


 Red-tailed Bumblebee (Bobmus lapidarius)
female, foraging on thistle flower.


Sunday 19 July 2015

The Glory of Thistles, Nettles, Dock and Brambles

Sustenance for many species - these wild plants are at the top of the list for versatility.

Small Tortoiseshell butterflies nectaring on thistles  July 2015

 Small Tortoiseshell nectaring - view of it's long tongue

Comma butterfly on river bank brambles amongst nettles
a warm sheltered spot in the evening sunshine.
Note the small comma-shaped white mark on its outer wing.

Today, Sunday 19th July, was warm, windy and humid, becoming hot before clouding over. 
The steep river bank and vegetation provided shelter from the wind for dragonflies and butterflies, with the sun warming the flowing water in different locations depending on the time of day.
A quick look revealed a male Common Darter dragonfly perched on the dry surface of a partially submerged log. With many insects flying just above the water, darting out to catch one was easy. It returned to the same perch each time. Not far away, low over the water vegetation where the shallow water formed a pool, an Emerald damselfly shone in the sunlight, its wings almost invisible. A small damselfly, it is usually found in ponds and could have just flown across the bank from the rapidly drying new pond.
A Banded Demoiselle male was fluttering and weaving low amongst the Dock and over grasses,  whilst a strong-flying Southern Hawker male dragonfly ranged along the grasses on the bank and flew up into a Willow.
Butterflies were numerous in more sheltered areas of the banks, Ringlets and Gatekeepers being the most active and numerous, with some Meadow Browns, Large Whites, Green-veined Whites, Small Tortoiseshells, Brimstones and a single high-flying Holly Blue.
BIRDS:
Nesting birds have been doing well this year, with no extreme weather - and many now have second or even third broods. It was good to see Song thrushes collecting food for their nestlings, searching and finding plenty in the damp margins of undergrowth along the river bank, returning time and again to collect more. Blackbirds, wrens, dunnocks and other birds are also busy feeding nestlings or newly-fledged young.
The quiet was shattered by loud yaffles from a green woodpecker on the meadow and nearby a great spotted woodpecker called in warning from an old oak.

The above was recorded on a quick look along a short stretch of the river but see below:

A full record was made earlier in July, on Friday 10th July 2105:
(This follows on from a short afternoon survey of butterflies in the afternoon of the previous day, Thursday 9th July  - see below this report)
Bright sunshine with a cool breeze on the morning of 10th July. The river was flowing well, although low the water was clear, cool in the shade becoming rapidly warm in the sun.
A quiet morning with sudden loud song from a wren low down on the river bank with other wrens singing loudly (16)  all along the river bank as I walked along. Two wrens were seen chasing whilst alarm calls indicated the presence of others. Some may well have second or third broods this year.
Just a single robin was heard singing and only 3 were seen today - they are silent when moulting in the summer  - and a single dunnock was seen in the undergrowth. Blue tits and great tits were less numerous too with only about 30 blue tits and 11 great tits seen and only a few heard bickering. Blackbirds (7) were also quiet, with some definitely still busy nesting whilst others are moulting. Song thrushes (3) were silent apart from some very short snatches of song and some are still nesting. This dry weather is good news for house sparrows which were seen and heard in good numbers in hedgerow and bramble thickets (more than 50). Goldfinches too (25) were doing well, having discovered sources of seed to forage on - the seeds from Dock are attracting large numbers of these cheerful birds which are heard singing together whilst perched in nearby oaks and maples, with more flying in to join them. They will rapidly consume the seeds and move on to other sources - thistles and grasses. Hopefully there will be enough left over for winter sustenance. 
Bullfinches are altogether more elusive but today a fine pair were seen flying over to the riverbank Hazel, the bright male trying to hide but not quite succeeding. Only 3 silent chaffinches were seen. With trees in full leaf, birds that perch and remain silent are often not seen - whereas the small but restless birds can often be spotted - such as chiffchaffs (6) although not singing today, several could be seen collecting insects and returning to places on the bank, obviously feeding young - and 2 blackcaps
one uttering an alarm call form a willow and another from a thicket on the bank. Five chasing juvenile goldcrests were seen moving quickly amongst the conifers whilst a mixed group of blue and great tits flew in to forage, all following each other.
Looking above the tree canopy 5 swifts were seen foraging over the river,  and a hobby was seen making some fast aerobatic manoeuvres over the 'scrape' - too far away to see if any dragonflies were present but it still contains water. Three black-headed gulls flew low across, with more probably gulls out of sight on the 'scrape'.
On the river itself, very well camouflaged, a female mallard was protecting at least 6 newly hatched ducklings, with overhanging vegetation probably hiding more on the small 'beach' under the banks. Further along, also well hidden, a moorhen was sitting on a sheltered nest of twigs and reeds in the shade. In the trees and on the grass 17 woodpigeons were seen dozing or feeding, 2 jackdaws flew over, calling and 4 magpies were heard arguing in the oak. A young Roe deer looked up from the long grass in the field beneath, ears just visible and 6 carrion crows flew over whilst a great spotted woodpecker flew out after calling from an ash tree. 2 very vocal juvenile nuthatches drew attention to themselves and at least one adult moved quickly along the branches. The adults may well have a second brood in the nest.
The last sighting and definitely not the least, was of a fine kingfisher. A robin had suddenly called out in alarm from an overhanging Blackthorn - and immediately below it, the kingfisher was startled and flew off its perch low on the river and flew away upstream, within the banks.


Early Bumblebee - Bombus pratorum on Musk Mallow flower
on the river bank.

Although today's survey took place in the morning, in contrast with yesterday's survey (see below - 9th July), most butterflies, bees and damselflies were active in the sun by 09.30.
The small pond and large pond were visited first, then the river. 
Damselflies:
Azure damselflies were seen again on the small pond with some exuvia (larval case, from which the damselfly emerges) visible low on reeds in the middle of the pond and one Azure damselfly was also seen on the river close by the pond.
One Blue-tailed damselfly and one male Banded demoiselle were also on the pond.
 Banded Demoiselle damselflies were seen in good numbers, on or near to the river - males chasing in the sun, perched on the river edge grass and on bramble leaves.
Butterflies:
Gatekeepers, Brimstones, Speckled Woods, Small Tortoiseshells, Small Skippers, Ringlets, Commas, Green-veined Whites, Large Whites, Small Whites and numerous Meadow Browns were seen mostly on the warm banks and field grasses and thistles.

Thursday 9 July 2015

The Day of the Skippers (and many others)

Today, Thursday 9th July, conditions were perfect for butterflies on the riverside.
It was a warm afternoon with few clouds, less humid and with a fresh breeze.

Small Skippers in large numbers were out on the long grasses and thistles which are now flowering at last. Skipping from flower to flower and dropping into the long grasses, it wasn't easy to find any that were still for long - in order to check the species - but today there did not appear to be any Essex Skippers amongst them.


This is clearly a Small Skipper as the tips of its antennae are 
orange (would be black on an Essex Skipper) and the upper
wing markings are bright orange with thin dark veins.


View of one of the numerous Small Skippers showing the upper 
wings and typical perching pose.
Thistles are a prime food source here - for bees as well - and
for birds later in the year.

Many other butterflies were seen amongst the Small Skippers:
Ringlets, Meadow Browns, Large White, Large Skipper,
Small Tortoiseshell, Speckled Wood and numerous bees..and...

First sightings this year - yesterday 8th July 2015
Gatekeeper butterflies chasing along the riverbank nettles and Meadowsweet -
before long finding a good source of nectar - Bramble flowers. 
There is a good mix of plants here that are essential for butterflies.
A total of 28 species have been recorded in a variety of habitats here in our
local riverine environment.

More to come on this!


Wednesday 8 July 2015

Cryptic Calopteryx

There are only two species of Calopteryx (Demoiselle damselflies) and both are active along the river here now that the water has warmed up. Usually the Beautiful Demoiselle - Calopteryx virgo damselfly emerges before the Banded Demoiselle damselfly - Calopteryx splendens but both emerged at about the same time this year.
On 2nd July 2015, in the afternoon, the riverbank became shaded and two Demoiselle damselflies, probably recently emerged, flew across from the river bank up to the top of a hedgerow where they perched amongst the flowering brambles - a good place to warm up and catch insects.

Watching and waiting from a high perch, an immature
male Beautiful Demoiselle damselfly - or is it?

Freshly emerged damselflies and dragonflies often have shining wings, sometimes bronze or gold-coloured, which change colour quite rapidly. Looking at the body colour of one of these two, on the top of the hedge, it appeared to be a Beautiful Demoiselle male, in the stage where the wings have not yet dried out or assumed their final colour of dark blue/black. Immatures can go through several stages of colouring of both wings and body and can obscure..there is no clear white spot on the wing which would identify it as a female, and the body colour was blue rather than green.

It is good to see both species doing well on the river now, greatly outnumbering other damselflies
(on the river, although not on the ponds where they are not seen). Most are seen chasing over the river or waiting on nettle leaves on the banks for passing insects, or as the one above, away from the river for a while. Its choice of perch about 2.5 meters up was too high for a good photo.


A warm sheltered place on the river, with running shallow water
is favoured by the Calopteryx species - but the Calopteryx virgo will fly
 off to explore surrounding areas. The females of both species will
spend most of the time away from the river - today they were
flying with Brimstone butterflies over the nettles and grasses.