Continuing on from my previous post..
The
first Small Heath was seen on the 17th May. They weren't seen in high numbers
in 2023, possibly because not as many people were recording along the coast
where they are most commonly seen. Apparently, there are two generations a
year, but it is difficult to separate the generations because they overlap and
vary according to each site along the coast and in the hills.
2023 could
certainly not be described as a Painted Lady year. I only received 46 records
and it was the first year, since I started recording butterflies in the 1990s
that I didn't see one myself. The first record received was on 29th May and the
maximum number seen in a week was 8 in August, indicating that they had managed
to breed. It is interesting that the other migratory butterfly, the Red
Admiral, did so well, but not so the Painted Lady.
The
first Meadow Brown was recorded on the 4th June. They had the best year since I
have been collating the butterfly records with 2565 butterflies recorded.
Almost every year they are our most numerous butterfly recorded.
In
contrast, the Common Blue had its worst year since I have been collating the
records! The first record was on the 12th June and I only received records of
252 butterflies, with the average number over the previous ten years being 465.
The Large
Skipper is a fairly recent arrival in East Lothian and is still seen in
relatively small numbers. The first record I received was on the 13th June and
I only received a total of 17 records. They have spread their range across the
county, being seen along much of the coast and the foothills of the
Lammermuirs. I suspect that it often goes unrecorded, being quite tricky to
identify as it whizzes between flowers.
Ringlets
were another species that had a poor year. In fact the worst year in the last
ten years, not counting 2020, when we were in lockdown. The first record was on
the 15th June and initially they seemed to do well, but just didn't peak in
July as they normally would.
The Dark
Green Fritillary also didn't do well in 2023 with the number of records being
about a third of what we would normally expect. The first record was on the 18th
June. The caterpillars feed on various species of Violets. I wonder if these
plants didn't do well the previous summer with the dry weather we experienced.
On the 21st
June I went into the Lammermuirs in search of Northern Brown Argus at a well
known site for them. I managed to see five, which wasn't too bad for a short
visit. They are only know to occur in a few small colonies in East Lothian and
there have been no records from a couple of those sites in recent years.
However, they were spotted on two occasions on the Barns Ness transect, so it
would seem that there is a colony there, too. Also eggs have been found in a
couple of locations north of Traprain Law, so there are probably more colonies
than we realise.
I saw
five Small Pearl-bordered Fritillaries when I was looking for Northern Brown
Argus. They were the only records that I am aware of this year. It is a rare
butterfly in East Lothian, which has only been recorded from a couple of sites.
The
final species to be recorded in 2023 was the Grayling on 3rd July. There is a
well-established colony on the pyramid at Meadowmill. I am aware of them being
seen in an east Lammermuir Dean and I hear that they are often seen at the old
power station site at Cockenzie. This year there was one seen at Levenhall,
which is very exciting. Maybe our re-location project is going to be a success
after all!
Sadly,
there were no Brimstones seen in East Lothian in 2023, having had a few records
in 2021 and 2022. We normally rely on the odd migrant flying in and I suspect
that until we have more food plants available for them, they will not be able
to maintain a presence in East Lothian.
I
didn't receive any records of the Green Hairstreak in 2023. They are known to
occur in a few remote locations in East Lothian, so we rarely get records of
them. I saw some just over the border at Soutra, where they appeared to be
doing well, so hopefully they are doing as well in their colonies in East
Lothian.
Similarly,
the recently discovered Purple Hairstreak occurs in a few small colonies in
East Lothian. I didn't receive any records in 2023, but I am sure they would
still have been at their covert colonies in the eastern Lammermuirs
There are 25 species
of butterflies known to breed in East Lothian, with two or three additional
species that are occasional visitors to the area. In 2023 I received 2244 ad
hoc records, totalling 7737 butterflies. These were in addition to the transects,
which recorded another 6025 butterflies. In addition to these, there are other
places that butterflies are recorded such as iRecord, iNaturalist and the Big
Butterfly Count. We are never going to get close to recording every single
butterfly that is in East Lothian, but I think we have a pretty consistent
recording method that gives us a good idea of what has been going on in East Lothian
over the last few years.
I am very grateful to all
of the Countryside Rangers and volunteers who contributed records and I am always keen for anyone else to send me details of butterflies they see in East Lothian. All of the records I
receive are passed on to Butterfly Conservation.