Sunday 9 August 2020

House Guest - House Pest?

With apologies to Richard Jones for borrowing the title of his book (ISBN 9781472906236).
I recently stayed in Big St Johns, one of the Lundy properties, while enjoying two week's holiday. Most of the time was spent out of doors, observing and recording nature. There were a couple of days when the weather was not very good when we had short walks and spent more time in doors.
We found durng the current pandemic that you can enjoy nature in your own garden or by venturing only quite locally from home. Bur, how many of us have had a good look around indoors? I'd like to persuade you that you don't necessarily need to go out to observe nature.
The first species I found in Little St Johns was under the box of groceries we had delivered from the Lundy Shop - a Banded Centipede (Lithobius variegatus). We usually manage to see some of these, but I've not often found them indoors. It is easy to determine this species with their diagnostice purple-striped legs. They are predators feeding on other insects, perhaps those detailed below.
Banded Centipede Lithobius variegatus
One of the most frequent species found most mornings when we began making breakfast is the Pill Woodlouse (Armadillidium vulgare) . These were easily the most common and two or three could be found during each day. We don't make much mess, but any crumbs were no doubt being hoovered up by them as they feed on organic matter.
Pill Woodlouse Armadillidium vulgare
Another myriapod we recorded, but only once, was the Common Shiny Woodlouse (Oniscus aselluswith its attractive yellow markings on each segment.
Common Shiny Woodlouse Oniscus asellus
In the corner of each room you could guarantee to find at least one Cellar Spider (Pholcus phalangioides). Their characteristic very long legs earns them their other name, Daddy Long-legs Spider. These are good guests to have as they prey on other spiders. So tolerate these and you might not see any other spiders in your accommodation.
Cellar Spider with egg sac Pholcus phaliongioides
We must have made some crumbs as we did find a couple of Silverfish, Lepisma saccharina. They feed on sugars and starches as their scientific name suggests. They are fast though and were a little challenging to photograph.
Silverfish Lepisma saccharina
I observed a solitary wasp continually flying against the window in the bathroom. I manage to persuade it out through the open window, but each morningh, it was back again. Eventually I identified it as Ancistrocerus sp. a Potter Wasp. When I read up on the species I found that they lay eggs in holes in wood then provision each egg with grubs which it paralyses so its developing larvae can feed on them. This wasp was seen one day head first in a redundant window fitting hole. Once it had completed this task it did not reappear. This is the second year I have seen this performance and now look forward to next year's sighting.
A Potter Wasp, Ancistrocerus sp.

The final species was an appearance late in the evening of a Pygmy Shrew (Sorex minutus). An insectivore, the previous listing, particularly of the Woodlice might explain what it was doing there. These are tiny and extremely active zooming around the skirting boards like a clockwork toy. It certainly had plenty of invertebrates to feed its high metabolic life-style. I was not quick enough to grab a picture so have used an early photograph taken outside on Lundy.

A Pygmy Shrew Sorex minutus

Seven species without venturing outside is a lockdown triumph.