Dene Park - cloudy, cool and windy

Well it didn't seem like a very promising day today, but I do think I've spotted my first Midland Hawthorn, Crataegus laevigata, found on my very own! Just a seedling right in the middle of the beech compartment, but its a start and now I can look for more! 

Joyce Pitt has recorded it here before, but I wasn't thinking about its potential presence until I actually raised the camera towards its leaves, and thought - hey they look a bit odd!

Characteristics include a rather trilobed appearance to some leaves (this is not in the books but does appear in quite a few pictures), rather undivided leaves (lobes do not extend more than 50% towards the centre of the leaf), and veins curving upward toward the tip, rather than outward toward the sides of the leaf. 

I should also check that there are no hair tufts in the vein axils on the underside of the leaves, as well as looking for the double styles in the smelly flowers if there are any!

Dene Park

In the grassy area by the car park this female Andrena was happily stocking up on pollen!

Bees at Trosley

While out with the British Butterfly Conservation Society Kent group at Trosley Country Park, I saw a lot of mining bees flying fast and low over the sparse grass of several areas of the chalk downland. Most of these were probably Andrena flavipes, the Yellow Legged Mining Bee. 

However this male appears to have a slightly reddish tail, and I think might possible be a male Andrena chrysosceles 

This I am fairly sure must be Nomada fucata, the cuckoo bee of Andrena flavipes.

Bourneside Meadow and Andrena haemorrhoa

Andrena are really fascinating solitary bees and there must be so much to learn about their mysterious lives. Today I was hoping for hoverflies but also came across quite a few Andrena which seemed to be flying in the canopy of trees. For example first there were quite a few Andrena in the twigs and branches of the Great Sallow bushes, Salix caprea, by the Red Pond along the Access Trail, of which I only caught one.

I don't know for sure that there were any more bees here than anywhere else, all I can really say is that I spent quite some time looking for hoverflies there, and that I saw mainly bumblebees visiting the catkins and mainly Andrena bees in amongst, and occasionally settling on, the branches. I think the Andrena may also have visited the catkins rarely, but I got the impression that most of the time they were not looking for food, just flying. I imagine that if you are a bee subject to predation by birds, then you are probably safer in amongst the twigs and branches, than out in the open. However I do also wonder whether there is a social feature in gathering together as well.

After quite a lot of time by the Red Pond I moved down to the riverplain of the River Bourne and ended up looking for bees on the dandelions in the damp meadow by Bourneside Farm. There was almost nothing there, but it was getting on towards 4 in the afternoon and I rather suspect the dandelions become less attractive to insects after about the middle of the afternoon.

There was at least one chiff-chaff in the treeline along the boundary with the land below Easterfield Bungalow, and while trying to get photographs there of the opening leaves of the native Common Alder, Alnus glutinosa, I saw some rapidly flying insects moving quickly in, and just outside the edge of, the canopy of the trees at about head height. They were moving so fast I couldn't even tell for sure whether they were bees or flies and I spent a lot of time trying, and failing (I need a bigger net?), to catch one. I would say that as far as numbers go, there were at least half a dozen and probably into double figures as a total. In the end I eventually caught one insect and that turned out to be a male Andrena haemorrhoa upon closer examination and under the binocular microscope. The insects did all look quite similar in size and "jizz" and if asked I would have said it was more likely that they were all males, rather than a mix of males and females, and possibly all of the same species.

I have found Andrena haemorrhoa in several places in the local area, but this seemed to be a specific association with these trees and also a specific behaviour.  It could be that the bees were commuting back and forwards along the tree line towards a food source or other site, or perhaps they were just flying to and from with some sort of social purpose. It would be useful to see if the behaviour is repeated on different days and times of day, and also to see if the all the insects are really all male Andrena haemorrhoa.

Here is a picture of one, this time a female, I took a few hundred metres away up on the Access trail in May last year:

You can see the foxy red colour of the hairs on the thorax (even more intense in the female as compared to the male), the whitish hairs around the face, the orange-red hairs on the tail, and the rather shiny black colour of the main dorsal surface of the abdomen.

The unfolding alder leaves were very difficult to photograph because of the shallow depth of field. As the buds swell the two main scales may part slightly, partly exposing the leaves within.

The scales then roll fully back on themselves, allowing the leaves to start their main phase of expansion, looking slightly shiny or possibly sticky.

Andrenas at last

At last things are starting to move a bit, and I came across small numbers of these male Andrenas on the path bank of the main ride just past the triangle going anti-clockwise.

Followed by finding a male Eristalis intricarius on male catkins of Sallow or Goat Willow in the hollow further along the track - no photos good enough to print though! 

Whetsted Gravel Pits

The Reed Buntings down at the Gravel Pits, Emberiza schoeniclus, is now in full breeding plumage, with the head cap now so black you cannot easily pick out its eye. In contrast the white lenticels on the dark alder bark show out very clearly indeed:

The Grey Sallows, Salix cinerea, there are getting going. The male catkins are now starting to protrude their anthers, and the male trees stand out brightly in the otherwise slightly dull landscape.

Big Bud on Hazel

The buds of Hazel, Corylus avellana, are sometimes slightly pointed but are still characteristically Hazel, including the slightly fringed scales to the bud.

This bud is infected with Phytoptus avellanae, the Hazel Big Bud Mite, an Eriophyid mite. The highlights in this picture have been darkened a trifle. On the twig I think you can see the two types of hair found on Hazel shoots and petioles, the bases remaining of the silky silvery hairs, together with the stiffer, more bristly, maybe glandular, reddish hairs. The bud still has the silky fringes to the scales characteristic of Hazel. According to Wikipedia, two forms of P. avellanae exist, a gall causer and a vagrant form that has a more complex life-cycle and does not form galls