Progress Against an Invader

Thursday at Blashford is volunteer day and we had a good turn out of fourteen for our first Himalayan balsam pull of the year. After many years of pulling this plant we have very significantly reduced the population and it is nowhere the dominant plant. The advantage of doing the first sweep early in the season is that we remove a significant number of plants but also get an idea of where the main problem areas are and so where to concentrate on our later visit. Pleasingly we found no more than a couple of hundred plants on about half the length of the stream, enough to suggest that there is still a seed source upstream  somewhere but not so many that it is having a serious impact on native wildlife.

The common terns are finally taking some interest in the rafts on Ivy Lake, although they are still not really taking control of any in numbers sufficient to deter the black-headed gulls. I tried putting out another raft during the afternoon in the hope that a new one might tempt them in. The gulls often just loaf around on the rafts, but have the annoying habit of bringing reeds and sticks and leaving them scattered  over the surface. I suspect they are mostly young adults, as the older birds started nesting a couple of weeks ago, a few may eventually build a proper nest, but in the meantime their practice efforts are putting off the terns.

Generally things were quite across the reserve, most of the birds are now nesting or getting ready to do so. Our visitor form North America, the Bonaparte’s gull is still to be seen, although it does not now attract more than the occasional admirer. I did manage to get a slightly better picture of it, which does show a couple of the differences from black-headed gull. You can see the slightly smaller size and overall thinner, more “pointed” look. Now that it is getting a summer plumage hood you can also see that this is blacker than that of black-headed gull, which is actually chocolate brown.

Bonaparte's gull

Bonaparte’s gull (right)

A very noticeable feature of the past week has been the huge increase in the numbers of damselflies around the reserve. Common blue and azure damselflies are now out in numbers, but the large red damselfly, typically the commonest spring species is very hard to find, perhaps due to the very poor April weather last year.

 

 

It’s Good to have a Hobby

And even better to have two! Which is what we saw today hunting insects over Ivy Lake when we went to put out another of the tern rafts. These sickle-winged falcons winter south of the Sahara and fly north to breed along with their favourite prey, swallows and martins. Watching them swooping to catch flying insects is a fantastic experience, you can only marvel at their mastery of the air, one of the great sights of summer.

The tern rafts are gradually being deployed, so far the terns have looked interested but failed to occupy any of the rafts before they have been dominated by pairs of  black-headed gull. It is always a problem getting the timing right and this is why I deploy the rafts one or two at a time, at some point the terns must surely be ready to take control of one.

preparing the tern raft

Preparing a tern raft

There have been at least 30 common tern around regularly and they have been doing courtship flights and bringing food, so I think they should be ready to settle soon. So far there has been little sign of much tern passage, apart from a few beautiful black tern, the biggest group so far being 5 on Sunday afternoon. Little gull are usually birds of passage that stay at most a day or so , which makes the fine adult that has been frequenting  Ibsley Water for several days something of an exception. It was there again today, although I don’t think anyone saw the Bonaparte’s gull. Other birds have included a few dunlin and common sandpiper and last week a bar-tailed godwit.

Barwit

Bar-tailed godwit

In recent posts we have featured a number of pictures of lapwing chicks, sadly I don’t think any of them have survived. This season has been a good one for the number of pairs and in general hatching success has been quite good, but the chicks have been disappearing fast. I think a combination of dry weather and predators is the cause. Dry conditions mean the chicks get brought to the lakeshore to seek food, as all their favoured puddles are gone, unfortunately the shore is regularly patrolled by fox and other predators, as it regularly has washed up food in the shape of dead birds and fish. The foxes may not be actively seeking the chicks but they will not refuse one should they come across it. Sadly a similar lack of success is befalling the little ringed plover, but at least they will continue to try and may yet succeed before the summer is out.

LRP

Little ringed plover near Tern hide.

The cold winds are making moth trapping a slow business, with few species flying, although we have caught an eyed hawk-moth and a couple of poplar hawk-moth recently.

poplar hawk

Poplar hawk-moth

Spring Between the Showers

On Thursday the volunteers were working out on the shore of Ibsley Water putting out fresh shingle patches for nesting little ringed plover and oystercatcher. Now that the old concrete block plant has been removed and the site opened up to the lakeshore there is a much larger area of suitable habitat for these species and for lapwing, so we have high hopes for the coming nesting season.

plover-patches

“Plover patches” small areas of fresh shingle ideal for nesting little ringed plovers.

It turned out we were just in time as on Friday the first little ringed plover of the season was seen! They are usually one of the first of the spring migrants along with sand martin. There are lots of other signs of approaching spring around the reserve now, the hazel catkins and flowers are out.

hazel-catkins

Hazel catkins, these are the familiar male flowers that produce lots of pollen.

The tiny female flowers are easily overlooked and very different, each tree will have both the catkins and female flowers, you just need to look closely to see them.

hazel-flower

Female flower of hazel.

It is not just hazel that has catkins, those of alder are also out now and rather similar to look at.

alder-catkins

Alder catkins, with last year’s seed cones.

I was also working with the volunteers today, although in less benign conditions, it rained and hailed and we took shelter by the Centre and made nest boxes. However Jim had thought to put out the moth trap and I was quite impressed to find it contained five moths, 2 twin-spot Quaker, a small Quaker, an oak beauty and a yellow-horned, so we got to see a little wildlife at least.

yellow-horned

Yellow-horned moth, the first of the season.

I did get lucky as I was opening up the Ivy North hide as the bittern was in the open beside the “pool” just below the western end of the hide, it must surely be thinking of going soon. At the end of the day I took a quick look at the gull roost, now mostly smaller gulls with about 3000 black-headed gull, only 21 common gull and just a single Mediterranean gull.

Water, Water

Everywhere! Rainwater ran through the main car park and all through the woodland, and topped up the lakes. Since Friday we have had over 70mm of rain! I went to retrieve a trailcam I put out on Friday, and the lake had risen right up to it although I had set it at least 30cm above the water at the time. I am not sure if the water had actually reached the camera – it was certainly wet, but after all the rain everything was. Fortunately the flash card still had the pictures on it. It turns out that Ivy Lake is very popular with teal after dark.

night-time-teal

Teal on Ivy lake after dark

Perhaps not surprisingly I also caught the great white egret.

gwe-on-trailcam

great white egret

There was also a little egret, but I only got it in reflection.

reflected-little-egret-on-trailcam

little egret in reflection

You can see it is a little egret as the yellow feet are clearly visible.

I saw very little until the very end of the day today when locking up I saw the great white egret perched on a branch in the Ivy Silt Pond; it then flew over the trees to Ivy Lake. Almost immediately a bittern flew up and circled the pond twice before also flying over to Ivy Lake.

Lastly and when it was near enough dark, I could just see over Ibsley Water where there were lots of gulls, but curiously very few lesser black-backed gull. Usually the most numerous, there were fewer than 500. By contrast there were 7000 or more black-headed gull, more than usual – presumably the stormy weather, or flooding, has prompted a change in roosting behaviour.

 

Dirty Work

Working in a nature reserve sounds great and, to be fair, often is, but it can have a less appealing side too. On Monday night someone had a concerted effort to break into our tool store, they used a disc-cutter to try and cut their way in, both from the side and by cutting off the door hinges. Their efforts failed, the store is connected to an alarm system and they left the scene empty-handed. The only bright sparks present were the ones that set fire to the contents of the store. Luckily the fire burned itself out before it did too much damage, but the burning polypropylene rope and other material managed to coat everything with thick black soot. So after we had got the hinges welded up there remained the filthy job of taking everything out of the store and cleaning it and then washing down the whole of the inside. It took all day and this was with the help of the famous Blashford volunteers in the morning and Emily all afternoon, all in all, I would say it would have taken me at least four days work on my own, except that it had to be done in one go so it would have actually been impossible to do alone. Our tools remain useable, although all with a rather dark patina, what I think is termed “smoke damaged”.

Of course doing this meant that we did not all get out to do work that would actually benefit the reserve, or at least not as much as we would have done. Luckily the volunteer team on Thursday is large enough that we were still able to deploy some people to cut the vegetation in front of Ivy North hide to improve the view and cut part of the sweep meadow.

Incidents like this are very frustrating, diverting resources to doing things that don’t benefit wildlife or visitors and take valuable time away from positive activity. Recent visitors will probably also have seen the caravan dumped in the entrance, something else that will cost money to get removed, hopefully it will go in the next few days.

Meanwhile, out on the reserve there was some wildlife. The great white egret was on Ivy lake for much of the day and the male stonechat was still on the shore of Ibsley Water, just west of the Tern hide. When I was locking up the Tern hide at the end of the afternoon the gull roost already contained about 1500 black-headed gull, about the same number of lesser black-backed gull, about 275 herring gull and at least 7 adult yellow-legged gull.

3o Days Wild – Day 23

Another Thursday and we decided to tackle what is without doubt the volunteers least favourite task of the year, ragwort control around Ibsley Water. When I first started at the reserve ragwort was the dominant plant around large areas of the shore, often to the exclusion of all other plants. Over the years we have cut and pulled it to try and establish a more mixed and predominantly grassy sward. It has been back breaking work, but it finally seems to be paying off. Walking the eastern shore it is now no more that occasional and forms part of an increasingly varied sward including sedges, bee orchid and much more.

Ragwort is actually a valuable nectar source and present in small amounts in grassland that is not used for hay does not present any real risk to livestock. Although poisonous few animals will eat it when growing. Fortunately at Blashford the grassland has many other nectar sources so loss of some ragwort  probably has minimal impact upon nectaring insects. As we worked we saw a good range of butterflies, despite the overcast conditions including lots of meadow brown.

meadow brown pair

Meadow brown pair mating

I also saw my first small skipper of the year, although a few have been seen on the reserve by others.

small skipper

small skipper

The day was not entirely positive though. Arriving at the reserve and looking out onto Ibsley Water it was clear that the black-headed gull pairs with chicks and single common tern pair that had just started sitting on the small island neat Tern hide had been lost overnight, probably to a predatory mammal. Fox is probably likely, but they often get the blame when others are actually the culprit and I cannot rule out badger, mink or otter.

black-headed gulls

black-headed gull pair

I got a real surprise at the end of the day when I closed up the Tern hide I realised there was a female common scoter floating around with the tufted duck flock. There was also a black-necked grebe reported in the hide diary, although I could not find it.

 

 

3o Days Wild – Day 20

A very wet day, it rained for the whole morning and showers continued in the afternoon until quite late. I was watching the skies quite closely as we had a plan to go out to the gull nesting island to ring some young black-headed gulls, but we needed it to be dry. Our luck was in, after four o’clock the rain stopped and the sun even came out, so the trip was on.

approaching the island

Approaching the island

Due to poor weather we were rather later than usual this year and as a result most of the gull chicks had already flown or just swan into the lake and watched us from a safe distance. We have been ringing some each year for a while now, but only in the last few have we been colour-ringing them, this enables the ring to be read in the field and results in a lot more records. It also means that we don’t need to catch so many birds to get results. The rings are large and easy to see with a telescope or even binoculars if the bird is close.

colour ringing the gull chicks

gull chick with a new colour-ring

Although most of the black-headed gull chicks were large there were a few nests with eggs or very tiny chicks, these nests were probably relays, that is second attempts by pairs that lost their first clutch.