Playing catch-up

The unexpectedly long period of warm weather in April brought everything on very quickly, so we're having what I can only describe as an early and 'strong' spring and early summer. I'm already seeing species that I would not expect until the end of May or start of June, and the Orange Tip butterflies have already laid their eggs:

Orange-Tip butterfly egg

The female lays a single egg (the larvae are cannibals) at the rear of the flower where the seedpod will form. The larva will feed on the seedpods as its sole food until it pupates.

The males are already sedate enough to stop for a photograph: normally they are far too flighty most of the way through May.

Male Orange Tip butterfly

Towards the end of the season - probably around 3 weeks' time - females run out of empty flowers and 'dump' their eggs on plants which already have eggs (or even larvae) in situ. These are doomed to be eaten, but the desperate females rely on the remote chance that their eggs will survive. This shows the importance of synchronisation with the sole foodplant: too early and there will be nowhere to lay; too late and all the suitable flowers will already be occupied.

Fungal rusts are also wasting no time:

Uromyces dactylidis on Creeping Buttercup

In common with most other rusts, Uromyces dactylidis requires an alternate host to live on while the primary vegetation is missing. In this case it's a range of grasses. I always find it intriguing that alternate hosts are rarely closely related to the primary host.

I'm currently working with a number of schools in the Heritage in Schools programme run by the Heritage Council in Ireland. This enables schools to book visits by heritage experts at a lower price than they would normally pay. I'm covering Natural Heritage, and this shot was taken at a visit to a school last week:

Common Frog

During a six-week period, we will count the species in a number of local habitats and draw up a biodiversity map for the local area. This will enable us to determine factors that encourage or inhibit biodiversity.

One early species found last week was the bumblebee-mimicking hoverfly Eristalis intricarius. During the early years of my local survey, this species confined to one small local area, but in recent years I have found it in more and more locations. It must be finding something that is beneficial.

The bumblebee-mimicking hoverfly Eristalis intricarius

Full steam ahead

After a wet early start, St. Patrick's day eventually brightened up and I went to an area that always provides early interest. This is the view looking north into an Ash wood with a stream along the right hand side.

View north into the Ash trees

Lesser Celandine is out all along the edge of the stream:

Lesser Celandine with Creeping Buttercup leaves to the right

No time is wasted before the fungal rusts appear. This is Uromyces dactylidis, which is common on leaves of various Ranunculus species, especially Lesser Celandine:

The fungal rust Uromyces dactylidis on Lesser Celandine 

And Puccinia lapsanae, which grows exclusively on Nipplewort. Notice that the rust has forced the leaf to grow a 'bulge', which serves to increase the available area for spore production/dispersal of the Puccinia:

Puccinia lapsanae on Nipplewort leaf

The ditch is also home for Opposite-leaved Golden Saxifrage, which has to be one of the most symmetrical plants I know:

Opposite-leaved Golden Saxifrage in flower

My last post showed an old mine of the micromoth Stigmella aurella on bramble. This leaf has at least 6 mines, some of which are currently occupied:

At least 6 mines of the micromoth Stigmella aurella on Bramble

This shot shows one of the micromoth larvae actively mining from left to right. Notice that the mine has abruptly turned right just before the margin: there must be something that the larva can detect that makes it turn before it is in danger of falling out of the leaf.

Larva of the micromoth Stigmella aurella

That shot is taken from below the leaf looking upwards, and shows light shining through the upper surface of the leaf, through the larva and through the lower surface of the leaf. Given that the leaf is no more than a millimetre thick, the larva is probably around 500 microns thick (and 3 millimetres long).

The ditch wall has many mosses and liverworts; these capsules belong to the moss Bryum capillare. Last year's capsules are still present, and the leaves of the Bryum can be seen to the bottom right of the image.

Capsules of Bryum capillare

Lastly for today, flowers of Hairy Bittercress, also known as Jumping Cress. If you want to discover the origin of the second name, just touch some ripe seedpods.

Hairy Bittercress (also known as Jumping Cress)

Hot Spot

I went to a spot that's usually very good at this time of year (south-west facing vertical banking below a hawthorn hedge) . It proved to be a good choice.

As soon as I saw this little (12mm) hoverfly, I knew she was new to me. She appears to be a female Melangyna, and a couple of microscopic features suggest Melangyna lasiopthalma. Since this would be a first Irish record, I need to go back and get some more solid evidence.

This Small Tortoiseshell was basking and feeding on the Lesser Celandines. It seems in pretty good condition, considering it has overwintered in those freezing conditions:

Common Fumitory - Fumaria officinalis - adds a splash of pink to the predominantly yellow verge:

A couple of weeks ago, I mentioned the tight threads that pull the Coltsfoot head into a downward-facing position. Here's a shot that shows the process:

Primroses were visible in a more sheltered part of the bank:

The queen bumblebees are getting very heavy already, and this B. cryptarum was clumsily crashing from flower to flower. Some appeared unable to fly at all and simply crawled from one flower to the next. I presume her nest is within walking distance!

The fungal rusts don't waste any time. The leaves are quite fresh and already the yellow spots of Uromyces dactylidis are clearly visible on Celandine leaves:

Yet another new member of the Orthosia family, the Clouded Drab - Orthosia incerta - came to light last night. Guess which pollen it eats....