Colour-ringed Sanderling

Keep an eye out for colour rings on these Daz-whites as they dash along the tideline. 

On the 10th of September, three colour ringed Sanderling were spotted among a flock of 208 on Sandymount Strand, doing the usual Sanderling thing – zipping along right in front of the waves, like clock-work toys in fast-forward. All three birds were ringed in Iceland in 2011, and have wintered in Ireland every year since!

Overview of Sanderling re-sighting locations in Dublin and Iceland. 

G1RWGR was ringed on the 18^th May 2011 in Sandgerði, and was last seen in Iceland on the 25^th May 2011. He was picked up again in Poolbeg in Dublin Bay on the 31^st July 2011, where he spent the winter, having his rings read numerous times between then and the 24^th April 2012. The next sighting of G1RWGR was on the 30^th July 2012, back in Poolbeg once again.

G1RWGR John Fox

Sanderlings don’t breed until they are two years old, so this guy wouldn’t have made the trip all the way the breeding grounds in Greenland or Canada in 2012. It’s likely that he did breed this year however, having last being seen in Dublin Bay on the 25^th February and not being picked up again until the 10^th September. 

Here's a quick summary of the re-sightings for the other two birds.

G2WWYG 

G2WWYG John Fox

22^nd May 2011 - ringed in Sandgerði in Iceland

13^th August 2011 – first spotted in Poolbeg, north Sandymount Strand

2011/12 winter – numerous sightings on Sandymount Strand

20^th February 2012 – last seen in Booterstown Strand, Dublin

15^th May 2012 – in Sandgerði harbour, Iceland

20^th August 2012 – back in Poolbeg, north Sandymount Strand again

2012/13 winter - numerous sightings on Sandymount Strand

25^th February 2013 – last Dublin sighting

10^th September – picked up on Sandymount Strand once again

G2WGGW John fox

G2WGGW 

30^th May 2011 - ringed in Sandgerði in Iceland

15^th September 2011 – first spotted in Booterstown, south Dublin Bay

2011/12 winter – numerous sightings on Sandymount Strand

15^th May 2012 – last seen in Poolbeg, Ireland

19^th May 2012 – in Sandgerði harbour, Iceland (1,500 km in 4 days!!)

26^th July 2012 – back in Poolbeg, north Sandymount Strand

2012/13 winter – numerous sightings on Sandymount Strand

12^th February 2013 – last Dublin sighting in Booterstown

10^th September – picked up on Sandymount Strand once again

Diamonds in the rough

Little Egrets, Grey Plovers and Black-tailed Godwits

The numbers of waterbirds in Dublin Bay are still building, but as we wait for the big numbers to arrive, we shouldn't overlook what’s already here.

Just north of the Bull Island causeway, you’ll often find an aggregation of Little Egrets – we've had up to 31 while out doing surveys recently. With their beautiful white plumage and diagnostic yellow ankle-socks, these small herons are the better looking cousin of the better known and more widespread Grey Heron.

Little Egret. John Fox.

These guys are recent arrivals from the Continent– 20 years ago such an aggregation would have resulted in hundreds of birders racing to see them – but we’re getting used to them now. That said, the Little Egret’s beautiful white plumage and their characteristic little chases after prey in our wetland pools are well worth stopping to take a look at.

Grey Plover. Richard T. Mills.

Also worth looking out for are the beautifully contrasting summer plumaged Grey Plovers – spotted black and white upperparts and black underparts with a white border. As their winter plumage takes over in the coming weeks, the drab factor will increase, and we’ll just be looking out for their black “armpits” (if you know what I mean!) to distinguish them in flight.

Black-tailed Godwits. Clive Timmons

And how can I talk about beautiful summer plumaged waders without mentioning Black-tailed Godwits! This rusty-orange plumage stands out wonderfully from the browns and greys of the mudflats. Enjoy this beauty when you can, because like the Grey Plover and the others, it will soon fade.

Don’t worry though; a host of colourful ducks have just arrived to provide another splash of colour to the mudflats.

A Black-Tailed Godwit in winter plumage, with a Wigeon.

Colum Clarke.

The boys are back in town

  

They say that one Swallow doesn't make it summer, but, for me anyway, the arrival of the Brent Geese does make it winter.

And this week, 800 of them have been reported in Strangford Lough, Co. Down, so it’s official! Birders in north county Dublin report that there are no geese present on the Rogerstown or Broadmeadow/Swords estuaries just yet, but that a single pioneering goose has been seen just inside the county border on Gormanston beach. As more and more of these birds arrive in Ireland from their breeding grounds in the Canadian Arctic, they will filter down along the east coast and into Dublin Bay.

Colour-ringed Brent Goose “CNRY” (right leg inscription, left leg 
inscription, right leg ring colour, left leg ring colour). Paddy Dwan. 

This population of geese is remarkably well studied, and the Irish Brent Goose Research Group have colour-ringed lots of them over the years. Ring reading, by what is now an army of dedicated amateur ring-readers, allows information on movements, site fidelity and survival to be collected. Even the social structure of this population is being studied. This will help to understand how an individual’s social standing affects its physical condition and survival.

Despite breeding in remote areas of the Arctic Canada, 
they are quite at home in the parks and pitches 
of Dublin in the winter. Matthew Silk.

Ultimately, all this work will highlight the factors that have the greatest influence on Brent Goose ecology and will feed in to future conservation actions for the species. So, when these birds turn up in Dublin Bay in the coming weeks, why not get out and see if you can see some colour-ringed ones? Any ring-reads (including the date and location) should be sent to grahammcelwaine@btinternet.com .  

What’s in a name?

Why are our chocolate brown-headed gulls called Black-headed Gulls?

Since arriving from Spain to work on this project, I’ve been puzzled by this! At home, we call them Gaviota Reidora, or laughing gulls, due to their calls...which makes a bit more sense, doesn’t it?

Black-headed Gull, breeding plumage. Ronnie Martin

Anyway, since we started the monitoring programme in Dublin Bay, we’ve counted lots and lots of them. We had a peak count of 5,917 on the low tide count on the 19^th of August. We haven’t managed to get any colour-rings just yet, but they are certainly worth looking out for. In the autumn of 2011, a colour-ringed Black-headed Gull was spotted in Booterstown. It turns out that this guy also had his colour ring read Poland in May 2010 and had flown 1,608 km to spend the winter in Dublin.

The re-sighting location and the sighting site in Poland (blue)

As it happens, the Irish Wetland Bird Survey (I-WeBS), which monitors wintering waterbirds throughout the country, is initiating a Gull Roost Survey this winter in order to get a handle on how our winter gulls are faring. If you happen to know of any places where gulls congregate at night roosts, it’d be great if you could let the I-WeBS Office at BirdWatch Ireland know. 

Black-headed Gull in winter plumage. Shay Connolly

Meet AJ - the record breaker

AJ holds project records for the longest distance travelled, the first Norwegian re-sighting, the second Norwegian re-sighting and is the (almost) record holder for the shortest bill at the time of ringing! What a bird!

Long distance record holder - AJ. Arnt Kvinnesland

AJ was re-sighted and photographed at Stavasanden, Karmøy, Rogaland, Norway on the 2^nd of April and on the 3^rd August 2013.

The re-sighting location for AJ (red) and the original ringing site (green)

AJ’s bill measured just 64 mm at the time of ringing and was beaten only by AZ (with a bill tip to feathers measurement of 63 mm). DJ, who turned up in Orkney on the 1^st May, and who happens to be the previous long distance record holder, had a bill length of 90 mm at the time of ringing, which was the longest of all 119 birds ringed.

Comparison in bill length between DJ and AJ. 
Colin Corse, Arnt Kvinnesland

Oystercatcher bill length is a result of their foraging strategies. Some opt to smash open their preferred prey – cockles and muscles – by hammering at them and blunting their bills, while others take a different approach and prise them open. Their bills are constantly growing (like our finger nails), so it’s possible for them to change in length depending on the prey they are exploiting at a particular time.

Returning Waders

This project involves year-round monitoring of Dublin Bay and the waterbirds it supports. A team of ornithologists will be surveying the area at various tidal stages and times of the day (including at night!) to chart waterbird distribution, abundance and behaviour throughout the bay. This information will allow us to build up a comprehensive representation of how the birds are using the bay for roosting and foraging (click here for more info on this) and will allow us define the most important areas.

Greenshank (right) with Redshank  John Fox 

Our first counts took place last month, and we notched up 24 different waterbird species. As expected, numbers were still low, as the majority of the northern breeders have yet to arrive. We had good numbers of Greenshank, most presumably on passage, but we didn’t manage to see any colour rings (click here for more info on colour-ringed Greenshank). Curlew, Redshank and Oystercatcher were present in decent numbers, and we had a few Whimbrel too.

Curlew Dick Coombes

It was great to be watching Bar-tailed Godwits in their “tomato soup” coloured summer plumage and Black-headed Gulls with their chocolate brown hoods while listening to House Martins and Swallows chattering overhead on their aerial pursuits. But it won’t be too long now before the summer plumage and the hirundine backing track fades, and we’re left with drab winter plumage and cold hands…

New Tern raft

You may be wondering about the new structure in the Tolka Estuary? 

In May this year, a raft was moored in the Tolka Estuary by the Dublin Port Company, with welcome assistance from members of the Clontarf Yacht and Boat Club.

Dublin Port Company’s tern raft near Clontarf. Richard Nairn

This large steel pontoon, last used for the Tall Ships’ visit to Dublin Port, has been specially adapted for breeding terns, by adding timber walls and a gravel layer, to mimic a single beach. 

Common Terns carrying fish to chicks on the tern raft. John Fox

Up to 12 Common Terns have been recorded on the raft over the summer, with one pair successfully raising young.