30 Days Wild – Day 5

You may have got the impression from yesterday’s three pictures of Tortrix moths that they are all grey or at best black and white, but nothing could be further from the truth and to prove it here is a very different one.

Agapeta zoeganaAgapeta zoegana

This one was in my garden moth trap, the caterpillar eats the roots of knapweed and probably field scabious, both of which I have growing in my garden mini-meadow.

My journey to work takes me across the New Forest and from time to time I see interesting wildlife on my way. This morning’s top spot went to a hawfinch which flew low over the road in front of me.

By contrast things at Blashford were pretty quiet today, the patchy weather perhaps not helping, with several showers and the wind pretty strong at times too. One surprise though was a pair of gadwall on the Education Centre dipping pond when I was emptying the moth trap. I have often seen mallard on there, but gadwall I had not expected.

Towards the end of the afternoon I went down to Ivy South to check on the common terns nesting on the raft. With the iffy weather I knew all the birds with clutches would be sure to be sitting tight. In addition the wind meant the rafts were swinging a bit so I could see from slightly different angles, with luck I hoped to get a good count of the sitting birds.

terns on raft 4x3

Nesting terns on Ivy Lake raft

I concluded there are certainly 23 nests on this raft, probably 24, and possibly 25, there is also one gull nest. In addition there is another on the other raft along with several black-headed gull and an additional pair which don’t seem to have settled yet. So the total is a minimum of 25 pairs and perhaps up to 27. There also appears to be one pair still milling around on Ibsley Water. The density of nests on this raft is amazing, it is only 2.4m x 2.4m (8ft x 8ft) so the total area is 5.75 square metres, there are at least 24 nests which gives each pair just under a quarter of a square metre each (50cm x 50cm).

Although our tern colony is not large but it is important as over the years it has been one of the most productive in the country, sometimes fledging over two chick for each nesting pair, typically productivity is between 0.5-1.0 chicks per pair on average across a colony. So you could say it is as important as perhaps a 100 strong colony might be elsewhere. Terns live a long time, 20 years and more, so the chicks produced at Blashford over the years will probably be out there in colonies all over southern England. One thing that is certain is that few return to us, if they did our colony would be in the low hundreds of pairs by now!

Overall, so far at least, this seems to be a good breeding season for lots of species. The fine weather suited most of the small birds, with perhaps only the thrushes not liking the dry conditions, The coot and moorhen have done well, they will have benefited from the good weather but their success also suggests we do not have a significant issue with mink on the reserve just now.

young moorhen

young moorhen

A successful early brood is doubly important for moorhens, as once full grown the offspring of the first brood will help to rear the next. This helps the parents, meaning the second brood can be larger but it also means the young will have experience in what it takes to rear a brood, making them more likely to succeed when they first nest themselves next spring.