16/2/2016

The Cornish Trip: a ringing round-up

by Chris Heward, Wetlands Research Assistant

Today, the Woodcock Watch team are back in the office after a successful (albeit tiring) trip down to Cornwall last week. The weather did not disappoint and provided us with the typically wet, windy and wild conditions we have come to expect.

Cornwall1

Here on the Woodcock Watch blog, we regularly post updates on the progress of our Hampshire-based woodcock ringing project. The primary aim of this research is to quantify the fidelity of woodcock to particular wintering sites.

In practical terms this simply means catching and ringing as many birds as possible over several years, but the analyses we can ultimately perform with the resulting data are complex and wide-ranging. We are also able to record average woodcock densities and estimate ratios of adults to juveniles to monitor annual fluctuations.

Ringing -woodcock

The fact that each bird wears a uniquely-numbered ring means we can measure changes in body mass for known individuals during the course of a winter and between winters, calculate survival rates and estimate total population size based on the likelihood of recapturing a ringed individual. Moreover, this ringing data contributes to a national bird-ringing database co-ordinated by the British Trust for Ornithology.

We usually manage two Cornwall trips per year, enabling comparison with our Hampshire site and with other study areas, such as the mid-Wales site monitored by the Woodcock Ringing Network’s Owen Williams.

Cornwall

Our target for the week was to ring 100 new woodcock. We did manage this but only just; our 100th woodcock was the last bird I ringed on our sixth and final night. As well as these new birds we managed a handful of ‘retraps’ from previous years – including two birds wearing geolocators.

Recovering the geolocators (a type of miniature light-logger) means that we can download the data stored on-board and use it to work out the routes their wearers have flown. One of these birds was tagged last spring, meaning it has made one spring and one autumn migration since. The other was tagged in 2014 and will therefore provide us with data for two round trips. There’ll be more details on these birds in a future blog.

Overall, the number of ‘retraps’ was lower than expected given the numbers of woodcock we have ringed in previous years (c. 80 in 2015 and c. 120 in 2014). This is probably explained by the fact that a large proportion of the birds we caught this year were juveniles visiting Cornwall for the first time. As I discussed in this blog about Nastasia, it seems likely that many of Cornwall’s regular migrant visitors are absent due to milder conditions elsewhere in the UK and across Europe.

With 100 extra woodcock now ringed, and another Cornish trip scheduled for next month, we ought to have a good proportion of the local population ringed. We are hopeful that we will be seeing plenty of these woodcock for a second time in February 2017!

Related blogs

News on Ruan (probably) >

Two recaptures: the plover and the woodcock >

Please help our declining UK woodcock

Comments

Srange place to find a woodcock ?

at 17:40 on 24/02/2016 by Ken Freshwater

I December I was clearing my driveway of leaves and disturbed a woodcock hiding in a pile of leaves. Pursued by my labrador he made a beeline for my garage where he settled behind some grain bins. When disturbed again he flew off apparently uninjured. I do see the occasional single bird on the edge of woodland near to the house. My only thought is that he had been temporarily winged by a vehicle and was taking temporary cover.

Woodcock

at 18:07 on 16/02/2016 by Peter Manfield

For your woodcock survey I thought you might be interested to know, that out dog walking in my local wood near Bury St Edmunds Suffolk, my cocker spaniel flushed 2 pairs of woodcock this afternoon. This wood was originally planted with 'Fir' trees for timber, and have been mostly felled for this purpose a number of years ago. Now replanted with native Hazel, and broad leafed trees, now provides an ideal habitat for woodcock, as there are a number of boggy areas also. I don't know if these birds are resident all year, or have migrated, however it's interesting that I nearly always spot them in pairs, and rarely as single birds when flushed. I just love to see them twisting and turning through the trees as they fly, and keep up the good work in your research, as this wood would not be the same without them.

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