Sierra Nevada Butterflies - June 2024 Part 1

On 17^th June I went on my traditional butterfly pilgrimage to the Sierra Nevada. It is a 200 kilometre drive in both directions from the villa we were staying in, but well worth the effort. There are four places I always visit there, which I know offer a great variety of butterflies. Initially I drive right up to the main ski resort at Hoya de la Mora and leave the car in the car park before the road barrier. From here I take the path down to the San Juan stream.

This is mostly quite rocky and barren, but there are a lot of little Alpine-type plants between the rocks.

Down by the stream there are a few areas of damp grassland, where amazing Gentian grow along with Tirana, which has sticky leaves for catching insects.

Almost as soon as I started walking I saw a Painted Lady drinking from a damp area below a patch of snow. I saw a few more of them on my walk down the hill.

A little further on and a blue butterfly landed ahead of me, which turned out to be a male Escher’s Blue. And further down the slope I saw a couple more, but those were the only Escher’s Blue I saw. Quite different from my visits in early July when they are quite common.

Small Tortoiseshells were dotted along the route and I saw about ten of them.

More numerous were Wall Browns which flew rapidly among the rocks and seemed to disappear when they landed!

As with everywhere else on my trip Small Whites were very numerous. It is always worth checking each white butterfly, as two of them turned out to be Bath Whites!

I saw this one, beautifully marked, Safflower Skipper.

As the ground became a little damper and more vegetated there were a few Nevada Blues about. I was very pleased to see these as I didn’t expect that they would be flying until July.

There were about five Clouded Yellows on this walk. Most of those I saw were the pale form, helice.

I returned to the car park and continued up the closed road beyond the barrier. My intention was to see if any Zullich’s Blues were flying yet. I met a group of about ten butterfly enthusiasts with big lenses who were patrolling the area. They told me that there had been a Zullich’s Blue photographed there the day before. Sadly, none of us saw one that day. However, I did see a Spanish Argus.

There were also a few Nevada Blues flying there and Queen of Spain Fritillaries.

I could have spent so much longer walking these areas, but I had quite a tight itinerary and two more exciting locations to visit.

Back to Sierra Nevada

When I visited the Sierra Nevada on 4th July I had been disappointed to see so few butterflies in the mountains because of the high winds. I was delighted to see so many species in a lower meadow, but it seemed a shame to be in Spain and miss the opportunity to see some very special butterflies that live high in the Sierra Nevada.

So, on 10th July I drove back to take another look. I was very relieved when I arrived that it was a lovely sunny, still day, so I set of up the mountain from the Hoya de la Mora car park.

Initially, I didn’t see many butterflies, but suddenly I found myself in the middle of a colony of Nevada Blues, Polyommatus golgus. There were at least 20 of these beautiful butterflies catching the morning sun in a sheltered area.

A little further up the mountain I noticed a subtle change in the shade of blue and realised that I was now walking amongst Escher’s Blues, Polyommatus escheri. I was interested to notice that they were in discrete colonies, whereas on previous occasions I have seen these two species sharing the same space.

I continued up the mountain to an area where I had seen Zullich’s Blues, Agriades zullichi, in the past. I spent some time searching the area, with little luck. The ground seemed quite churned up, as if cattle had been grazing there on the very sparse vegetation. Certainly when I look back at pictures taken in the same area two years ago, it was a lot greener then.

I found some Spanish Argus, Aricia morronensis, which look quite similar.

And two or three Painted Ladies, Vanessa cardui.

There were also a few Spanish Brassy Ringlets, Erebia hispania, but as usual they were really difficult to approach without disturbing them.

Finally, I saw a Zullich’s Blue. They are very difficult to follow, as they fly low and blend into the background. Those that I saw looked very worn, but just as I was about to leave I saw a fresher-looking female. I was delighted to see this lovely butterfly again, but it is a little concerning that I only saw five individuals. Two years ago I estimate seeing more than 15 in this same location.

I then headed back down the mountain towards a stream that I have visited a few times in the past. It was interesting to see the difference in the butterflies I saw this time. The numbers were certainly lower than I had previously seen. There were the occasional Nevada Blue and Escher’s Blue, but the Common Blue, Polyommatus icarus, was more numerous.

There were very few Silver-studded Blues, Plebejus argus, in amongst the low-growing junipers. On previous visits there were a lot more numerous.

Occasionally I would see a Small Tortoiseshell, Aglais urticae, or Wall Brown on the more rocky slopes.

Down at the stream and along the wet grassy areas, where last year I had seen several Meadow Fritillaries, there were surprisingly few butterflies this year. I crossed the stream and searched a scrubby area, which had looked good from a distance, but amazingly there were no butterflies there, other than a couple of Small Coppers, Lycaena phlaeas.

The highlight for me was a beautiful Cardinal Fritillary, Argynnis pandora, that was sun bathing on a rock in the stream.

On my way back to the car I saw a couple of Small Whites and a long chase eventually allowed me to identify a Bath White. These white butterflies reminded me that I hadn’t seen any Apollos this trip. Just as I thought that, one flew past me and glided down the hill side. What a difference from two years ago when I saw so many.

Towards the end of my walk, I was surprised to find a snow bank blocking my route. I diverted around it and rejoined the path on the other side, which was wet with snowmelt. I was delighted to see some butterflies puddling on the path.

There were two Cardinals, two Small Tortoise shells and three blues.

The blues turned out to be a Common Blue, a Nevada Blue and an Escher’s Blue, demonstrating nicely the subtle differences between the species.

Had this been my first visit to the Sierra Nevada I would have thought that there were a lot of butterflies, but having visited previously I noticed that numbers were a lot lower than on previous visits. It is interesting to speculate why this would be.

Certainly, there was a lot more snow around, so possibly it had been cooler than in previous years. I also noticed that there were more cattle and goats than I had seen in previous years. Possibly they had grazed more of the wild flowers.

It is good to know that there are a lot of researchers working in the Sierra Nevada monitoring grazing and climate change and their impacts on invertebrates. It would be very interesting to talk to them and find out more about the long-term trends.

Sierra Nevada Butterflies - July 2016 (3)

I retraced my steps towards the car park, but took a shortcut below the observatory as I wanted to head towards a stream in the valley below. I noticed that a small cloud had developed above the valley and it appeared to be stuck there. As I entered into its shade I saw a lovely female Escher's Blue, Agrodiaetus escheri, waiting for the sun to come out again. I decided to wait with it to see if I could get a photo of the upper side of its wings.

Thankfully, when the sun came back out it opened up its wings. I have taken many pictures of female Lycaenidae, which I find almost impossible to identify from the upper wing shots. I hope that this picture may help me to identify other female Esher's Blues.

As I walked down the feint path in the mountain side I came across several Spanish Brassy Ringlets, Erebia hispania. They were quite obliging as they sat against the rocks warming up once the cloud had passed.

It is difficult to say which blue butterfly was the most common on the way down to the stream. There were probably equal numbers of Escher's Blues, Common Blues, Polyommatus celina, and Nevada Blues, Plebicula golgus. With almost every step another would fly into view.

Common Blue

Nevada Blue

The cloud also slowed the Apollos, Parnassius apollo nevadensis,  down a bit. I remember on my previous visit watching them for ages drifting up and down the mountain side without stopping. On my descent they were all on the ground, only flying when they were disturbed.

On the short grass by a spring I saw this lovely Safflower Skipper, Pyrgus carthami nevadensis.

This beautiful female Knapweed Fritillary, Melitaea phoebe, briefly stopped next to the path. This is the first time I have seen this butterfly.

When I reached the grassy area next to the stream I saw a few larger fritillaries. They all turned out to be Dark Green Fritillaries, Argynnis aglaja. A butterfly that I haven't seen in the Sierra Nevada before.

There were also about 20 or so smaller fritillaries. These were Meadow Fritillaries, Melitaea parthenoides, another butterfly that I haven't seen before. It is strange that they were so common this year, but two years ago I didn't see any in exactly the same location.

I spent some time down at the stream, enjoying the beautiful clear water cascading through the rocks and the many insects that live alongside it.

I was thrilled to see this cow pat, which was attracting various male blue butterflies. In this picture there are Common, Escher and Nevada Blues.

Every so often I would see a Purple-shot Copper, Lycaena alciphron gordius. I love the purple edging to their wings.

Other butterflies seen there, but not photographed were Clouded Yellows, Colias crocea, Cardinal Fritillaries, Argynnis pandora seitzi, Small Tortoiseshells, Aglais urticae, Bath Whites, Pontia daplidice and Wall Browns, Lasiommata megera.

On my way back up the mountain I saw this lovely Heath Fritillary, Melitaea athalia celadussa.

It was fantastic seeing so many butterflies and such a variety, but I had to drag myself away as I still had a couple of other places I wanted to check out.

Sierra Nevada Butterflies - July 2016 (2)

I drove up to the car park at the ski resort at Hoya De la Mora. This is as far as you can drive, although it is possible to take a mini-bus further up the mountain. As I got out of the car I saw a Bath White, Pontia daplidice. I had seen a number of similar butterflies on the drive up the hill, so it was good to confirm its identity.

I started to walk up the mountain to another area recommended by Mike Prentice. Almost immediately I saw a Purple-shot Copper, Lycaena alciphron gordius.

Then a larger butterfly caught my eye. It turned out to be a Painted Lady, Vanessa cardui. We had just experienced an influx of Painted Ladies in Scotland and evidently they were doing well here, too. I saw another one just a little further up the path.

I was delighted to see so many Apollos, Parnassius apollo nevadensis. The sub-species in the Sierra Nevada has orange, rather than red, ocelli. They seemed a lot more approachable this year and a little later when a cloud came over they all landed and on a couple of occasions I very nearly stood on one! I guess with such large butterflies they need the energy of the sun to keep them airborne.

There were a number of Small Whites, Pieris rapae, flying in the same area as the Apollos along with one or two Small Tortoiseshells, Aglais urticae.

There were also blue butterflies there, which I could only identify by photographing them and enlarging their picture on the camera. They all turned out to be Escher's Blues, Agrodiaetus esheri.

A little higher up the Small Tortoiseshells were replaced by Queen of Spain Fritillaries, Issoria lathonia. The last time I was in Sierra Nevada I very briefly saw one of these a little lower down the mountain, but this time I saw seven or eight.

My reason for climbing further up this barren-looking mountain side was because Mike Prentice had suggested some sites I could check for Zullich’s Blue, Agriades zullichi. I was amazed that there continued to be plenty of butterflies despite the apparent lack of vegetation. I didn’t spot any Zullich’s Blues at the first area he had suggested, but I was over the moon to spot one at the second location, which was at about 2,650 metres above sea level.

I think there were about 15 Zullich’s Blues there and I saw some very similar-looking Spanish Argus, Aricia morronensis, flying with them. These were both new species for me.

It was lovely to watch them with an occasional fly past of an Apollo, which looked enormous compared to the small Lycaenidae. Some Nevada Blues, Plebicula golgus, also joined the party. I spent some time at that location and sat down on a rock with a snack while watching these rare butterflies.

It seemed like such a hostile environment for these small creatures to live in. This was the height of summer, but there was still quite a wind blowing and very little shelter.

Eventually I had to drag myself away as there were so many more places I wanted to explore. However, I was quickly distracted by a Spanish Brassy Ringlet, Erebia hispania. Unlike two years earlier these ones allowed me to take a picture. I saw quite a few as I started to descend the path.

Next I wanted to head down to a green area near the stream lower down the valley ...