Archive for the ‘Garden Warbler’ Tag

Late July – early August 2015: the start of the autumn ringing season and a birthday on a boat.   Leave a comment

I haven’t uploaded anything to the blog since I reported on our week in East Anglia, Leeds and Derbyshire as I have been very busy preparing for the main bird ringing season.

Although we ring birds throughout the year, the maximum activity both from the birds and from the ringers is in the ‘autumn’ period from mid July to mid November. Many people roll their eyes when you describe late July as ‘autumn’ with comments like ‘we haven’t even had summer yet’ but if you’re to describe the northbound birds in March, April and May as being on spring migration, then the south bound movement which can start as early as June and is well underway by mid to late July must be the autumn migration. Indeed in early June late northbound migrants like Sanderling and some Reed Warblers can overlap with southbound ones like Green Sandpipers.

As July progresses local breeders leave their natal area and disperse and the first long distant passerine migrants like Sedge and Willow Warblers reach our sites. To continue to monitor the numbers and movements of these birds we need to be ready.

IMG_6258 FLC net ride1

The first thing that needs to be done is to clear all our ringing areas of several months of bramble, black thorn, fern, gorse and nettle growth. In some locations a strimmer can be used in others local regulations mean it has to be done with a pair of shears. This net ride is at our Fleets Lane site in Poole.

IMG_6269 Garden Warbler 3

July/August is the most fascinating time of the year for the ringer as young birds have either to start/are undergoing/or have completed the post-juvenile moult and adults are undergoing a full or partial moult depending on moult strategy of the species concerned. This 1st year Garden Warbler has undergone it’s partial post-juvenile moult before migrating and will undergo a complete moult during the winter in Africa. This species is very much the exception in the Sylvid babblers (members of this genus have been shown to be babblers and are not related to other warblers at all) as adults also have a complete moult in Africa. In almost all of the other Sylvias adults have a complete moult before migrating and hence have fresh plumage just like 1st year birds, making ageing more tricky.

IMG_6273 juv male Blackcap

Another common Sylvid babbler is the Blackcap. Juveniles of both sexes have dark brown crowns and the black cap of the male only appears during the post-juvenile moult. This is thought to be an evolutionary strategy that prevents the adult male treating his own sons as rivals.

IMG_6263 juv Blackcap wing

A partial post-juvenile moult means that the bird replaces body feathers on the head, body and on some or all of the wing coverts but not the primaries, secondaries or tail. Often the primary coverts and one or more of the outer greater coverts remain unmoulted as can be seen in this Blackcap. After the moult is complete careful evaluation of the contrast between (in this case) the single unmoulted outer greater covert and the new inner ones will allow this bird to be aged as a 1st year until it has a full moult at this time in 2016.

IMG_6254 Gt Spot juv wing

To show how complicated this moult business is, take a look at this juvenile Great Spotted Woodpecker (you will have to take my word that it has the red crown of a juvenile). Although it is only a few months old it is already undergoing a full moult with four outer primaries still to be replaced, the 5th growing and the rest completed. Strangely in its 1st year this species moults either none or some (but not all) of its primary coverts, so in the spring the primaries are fresh and the coverts are abraded.

IMG_6337 Lytchett Bay

This time of year is by far the best for ringing at our rather muddy site at Lytchett Bay. Reed and Sedge Warblers are present in abundance and there is always a remote possibility of the ringing the globally endangered Aquatic Warbler that passes through in very small numbers.

IMG_6261 Kingfisher

As well as Acrocepahalus warblers we also ring small numbers of Kingfishers every autumn. These birds move down the rivers to the estuaries after breeding. Usually only one or two are present at the site but up to twelve are been ringed annualy showing an ongoing migration. We often catch a bird we have ringed in previous years and one of our birds was re-trapped in Totten, Southampton.

IMG_6339 Kingfisher

Kingfishers can be aged by the colour of the upper surfaces of their (tiny) feet, smoky in 1st years, orange in adults. The colour of the base of the lower mandible can be used to sex them, orange tones in females (in this photo) and black in males (as in the previous photo), although this difference is more marked in adults.

IMG_6340 Lytchett fields

The RSPB has been managing some of the fields at Lytchett Bay and has built a view-point overlooking one of the ponds and has just installed an information board ….

IMG_6341 no pubic access

…. on exactly the same day that Wessex Water put up this sign on the lane that leads to the viewpoint (and to their water treatment works). Talk about a lack of joined up thinking!

IMG_6276 Bearded Tit LH

On the other side of Lytchett Bay is Lytchett Heath, an area owned by Dorset Wildlife Trust. We have permission to ring on the heath and nearby reedbeds. A busy morning last week resulted in the capture of over 100 birds including this male Bearded Tit. This is another bird of uncertain affinities, it certainly isn’t a tit, it has been allied with the Asian parrotbills, but now resides in a family of its own. It’s English name is also controversal, not a tit, so the name Bearded Reedling has been used, but it’s not ‘bearded’ either. I suppose Moustached Reedling would be a step too far.

IMG_6278 juv Redstart

The most surprising bird at our Lytchett Heath session was this Common Redstart in full juvenile plumage. Birds are not thought to migrate until they have almost completed their post-juvenile moult, so this bird probably hatched nearby. Although relatively numerous in the New Forest, this is a scarce breeder in Dorset, for example the 2011 Dorset Bird Report mentions just three sites, seven singing males and four fledged young for the whole county.

IMG_6280 juv Redstart LH

The name of the 14 Old World species of redstart, is derived from the colour of their tail, the Old English for tail being ‘steort’. Pioneer ornithologists in America found an unrelated bird (now classified as a New World Warbler) with red in the tail and called it American Redstart, but the name ‘redstart’ was carried over to a multitude of related warblers in the Neotropics, all of which have white not red in the tail. Recent attempts to rename these Neotropical warblers as ‘whitestarts’ has met with ambivalence.

IMG_6282 Poole Quay

In complete contrast to my early morning and muddy ringing sessions we attended a lovely birthday celebration hosted by our friend, fellow birder and moth-er from Swanage, Phyl England.

IMG_6287 Phyl and Paul

Phyl, here seen with Paul Morton, is celebrating her 80th, yes 80th birthday!

IMG_6300 Phyl's birthday cruise

Of course, as the hired Brownsea ferry cruised around the islands of Poole Harbour, we celebrated in the traditional manner.

IMG_6294 Brownsea castle

I was expecting that we would sail around the back of Brownsea, past the castle and the lagoon and return to Poole Quay ….

IMG_6297 South Haven

…. but instead we went past the Haven Hotel and out of the harbour mouth ….

IMG_6307-Old-Harry

…. towards the rock pinnacles of Old Harry.

IMG_6309 Old Harry

Indeed we went so far past Old Harry that we wondered if Phyl and her family had arranged to be dropped off at Swanage.

IMG_6311 Moon rise

Expecting a mainly social event, I had only brought my pocket camera so I couldn’t do justice to this beautiful red moonrise.

IMG_6323 Sandbanks ferry

It was almost dark by the time we passed the Studland ferry re-entered the harbour.

IMG_6326 full moon

…. and with the full moon shining on the water ….

IMG_6329 Poole Quay at night

…. we got back to Poole Quay about 2220. Thank you very much for a lovely evening Phyl.

IMG_6350 Janis and Kitzie

And finally Margaret’s daughter Janis has been looking after this little dog, Kitzie, for a friend.

IMG_6342 M and Kitzie1

I’m not much of a dog person, but have to admit that he was quite endearing (and no, we have no plans to get one).

Late April 2015 – local birding and ringing   Leave a comment

With just a few weeks between our return from the USA and the upcoming get together with Margaret’s family in Austria for her nephew’s wedding, spring birding and ringing, has of necessity, taken a back seat. However I have managed a few trips out in the field and three ringing visits to Durlston (it would have been more but I was hampered by strong winds for much of the time). This short post highlights some of the more interesting birds ringed.

P4260336-Portland-Bill

I made two visits to Portland and later to Lodmoor and or Radipole and was able to catch up with some of the spring migrants. Here in a photo taken in spring 2014 a group of birders are scanning for seabirds/passage migrants at the Obelisk at Portland Bill. On my last visit I saw Great and Arctic Skuas, Manx Shearwater, Common Scoter, Whimbrel and Sandwich Terns passing this point as well as the commoner or resident species like Common Guillemot, Razorbill, Puffin, Shag, Gannet, Fulmar and Kittiwake.

IMG_5971-Mordon-Bog

The area round Mordon Bog in Wareham Forest is a favourite of mine and although it hasn’t delivered many new birds for my year list recently, birding here is always a pleasure. Dartford Warbler, Woodlark and breeding grebes and ducks on the nearby lake are always nice to see and a heard only Cuckoo added enjoyment. I will have to leave it until my return from the Alps to see Hobby and Tree Pipit though.

IMG_5972-Leswh

Spring ringing at Durlston has always been a hit or miss affair. Unlike Portland migrants seldom seem to linger and we get far fewer birds than in Autumn. Various hypotheses based on the geographical positions of the two headlands have been put forwards. A small number of Willow Warblers, Chiffchaffs and Blackcaps have been trapped as well as the five species shown in this post. This Lesser Whitethroat was ringed on 21/4/14 and was retrapped almost to the day and presumably breeds somewhere at Durlston.

IMG_5975-White

Common Whitethroats are as the name suggests, a much commoner birds with anywhere from 50 -100 pairs in the Park. Young birds have dark eyes but by the spring both second-calender year birds and adults have the same eye colour. A few can still be aged on the colour of the outer tail, white in adults, fawn coloured in second year birds, as having a complete moult after breeding these will be the same feathers that they migrated with in the autumn. The dark grey head is indicative of a male but many intermediates between this bird and the brown head of a typical female occur.

IMG_5993-Garwa

Garden Warblers belong to the genus Sylvia along with Common and Lesser Whitethroats (actually they are not warblers at all but babblers – but that is a different story). Unlike their congeners they undergo a partial moult post breeding and both adults and young undergo a complete moult in Africa. Thus adults are abraded when they migrate to Africa in autumn but both adults and second year birds are pristine on the return, as can be seen by the fresh pale tips to the primaries, secondaries and tertials and so cannot be aged.

IMG_5989-Common-Redstart

I was pleased to ring this female Common Redstart on the 23rd of April as we seldom trap many in the spring….

IMG_5987-Black-Restart

….but far more rewarding was its the capture of its cousin, a female Black Redstart. This was the first Black Redstart to be ringed at Durlston and the first I have seen in the hand. Common Redstarts breed in mature woodland, our migrant birds are probably heading for Wales and NW Scotland. Black Redstarts however are seen in the UK as winter visitors, summer visitors and passage migrants. They prefer rocky outcrops, cliffs, abandoned buildings, industrial sites etc to breed but are nowhere common. A pair has bred on the cliffs at Durlston for years but are never seen away from the immediate area. It is far more likely that this bird was a passage migrant.

We have fewer ringers to man the ringing site at Durlston this year but come the autumn I intend, weather permitting, to put in as much time as I can to help monitor migration at this outstanding location.