Chaffinch - 2008 winter

Fringilla coelebs

Chaffinch numbers have been boosted during the winter months when the sedentary breeding population has been joined by immigrant continental birds. Bertram Lloyd (1939) considered the small groups he found around farm rickyards and dungyards to be local birds but the larger flocks in the more open countryside were continental birds.

Since then the farmyard groups have largely disappeared in the absence of spilled grain and dung heaps, which have largely given way to slurry pits. Groups in the wider countryside have varied in size and distribution dependent on the nature of changing agricultural practices. Those areas proving attractive to Chaffinches have been barley stubbles, seeded turnips, unharvested linseed and crops like sunflowers planted for the benefit of Pheasants. Beech mast has also been exploited but the quantity available is cyclical and the trees are local and sparsely distributed in the county.

The size of most winter flocks has been between 50 to 300 birds, with some larger gatherings on record. 500 were at Longhouse on the 6th February 2004 and Castle Martin on the 15th January 2007, 600 at St Florence on 31st December 2005, 750 at Angle on the 23rd December 2008, 900 at Marloes on the 25th January 1993, 2,000 at St Florence on 29th January 2006 and 3,000 at Hubberston on the 5th January 2006. 

Graham Rees. (Covers records up to and including 2008)
References: LLOYD. B. 1929-1939 Diaries, National Museum of Wales.

Chaffinch - 2008 migration

Many Chaffinches from northern Europe, particularly Scandinavia, migrate in the autumn down the Continental west coast, crossing either over the southern North Sea or the English Channel to winter in Britain. Some continue through Britain to Ireland.

Lockley et al (1949) described Chaffinch migration of tens of thousands coming down over Cardigan Bay to strike the northern and western coasts of the county during October.

Betts (1992) noted large movements through Skokholm in October and November, including 3,200 passing on the 22nd October 1966 and 2,000 grounded in fog on the 26th October 1988.

A total of 11,600 were logged passing Strumble Head during 12 days of observation between the 16th October and the 22nd November 1981. Peak passage involved 2,160 on the 24th October and 2,590 on the 1st November.

The Pembrokeshire Bird Report for 1986 recorded many thousands passing Strumble Head between the 4 October and the 12 December. It added it would have taken an army of observers to count the visible birds but many more were heard that were too high to see.

The volume of passage during October to November diminished thereafter. Peak autumn totals at Strumble were 2,405 in 1999 and 2,711 in 2007. Peaks at Skomer were 3,500 in 1993 and 4,850 in 2008.

At least 1,000 passed over the St David’s peninsula on the 24th October 2002. 1,000 coasted at Pen Anglas on the 15th November 2007. 1,350 passed Pencarnan in half an hour on the morning of the 23rd October 2009.

Flocks have sometimes temporarily accumulated in coastal regions during autumn passage time e.g. 400 at Marloes on the 24th November 1991 which soon moved on.

Fragmentary as the available records are, they evidently indicate that considerably fewer migratory Chaffinches have been reaching Pembrokeshire since the massed movements of the1940’s to 1980’s period.

Lockley (1957) described a strong return passage during March and April but this has not been detected since, other than a few Chaffinches appearing on the offshore islands at this season.

Graham Rees.
(Covers records up to and including 2008)

References
BETTS. M. 1992. Birds of Skokholm, BioLine, Cardiff.
LOCKLEY. R. M, INGRAM. C. S. and SALMON. H. M.1949. The birds of Pembrokeshire, West Wales Field Society.
LOCKLEY. R. M. (1957). Pembrokeshire, Robert Hale, London.
REES. G. H. (Ed). Pembrokeshire Bird Reports, 1981 – 1986, West Wales Naturalists Trust.

Chaffinch - breeding

The Chaffinch breeds throughout Europe eastwards to western Asia and south to North Africa and the Canary Islands. It is resident and migratory.

Mathew (1894) classed the Chaffinch as a “common resident” and Lockley et al (1949) considered it an “abundant resident” but also noted it was a passage migrant and a numerous winter visitor. Donovan and Rees (1994) agreed with the latter assessment but also plotted breeding distribution in the county using a tetrad grid and attempted to estimate the size of the breeding population. The original breeding distribution survey was conducted between 1994 and 1988 and a repeat survey using the same methods was made between 2003 and 2007.

Breeding survey period	1984 - 1988	2003 - 2007
Breeding distribution Red = confirmed Orange = probable Yellow = possible White = no records
Total tetrads where found	448	446
Confirmed breeding	209	155
Probable breeding	214	278
Possible breeding	25	13

Little change in distribution was detected between the two surveys. Chaffinches take up territory in late winter but do not normally lay eggs until early May. With such a long period of song it seems unlikely that many were overlooked, even in marginal tetrads.

 The population estimate accompanying the 1984 – 88 survey was based on census results from reserves which were mostly woodland plots. The resultant value of 120 pairs per tetrad was applied to the whole county. However, woodland in the county represents only about the equivalent of 11 tetrads, the remainder being mostly farmland which carries smaller densities of Chaffinches. A reappraisal required an assessment which accommodated farmland.

 The New Atlas of 1988 – 91, which was not available at the time of the 1984 – 88 assessment, supplied an average density for the UK. If this is applied to the 1984 – 88 distribution, a revised estimate for Pembrokeshire at that time was about 38,000 pairs. It is likely there has been a decrease since then because of the effects of eradicating field headlands and clear felling many tree plantations. Climate change may also have reduced the availability of invertebrate food.

 The BBS noted a decrease of 13 % in Wales between1994 – 2007, which if applied to the earlier estimate, suggests a breeding population of 29,000 pairs in Pembrokeshire at the end of 2007.

In Pembrokeshire Chaffinches nest in trees and bushes, being found in woodland, hedgerows, parks and gardens, being absent in the county only from the tops of Mynydd Preseli and most of the offshore islands. It has normally bred on the partly wooded Caldey Island and has nested on Ramsey Island, most recently in 2006.

 Graham Rees.

(Covers records up to and including 2008)

References

DONOVAN. J and REES. G. 1994. Birds of Pembrokeshire, Dyfed Wildlife Trust.

GIBBONS.D. W, REID. J. B. & CHAPMAN. R. A. 1993. The New Atlas of Breeding Birds in Britain and Ireland, 1988 – 91, Poyser, London.

LOCKLEY. R. M, INGRAM. C. S. and SALMON. H. M.1949. The birds of Pembrokeshire, West Wales Field Society.

MATHEW. M. 1894. The birds of Pembrokeshire and its islands, R. H. Porter.

RISELY. K, NOBLE. D. G. & BAILLIE.S. R. 2008. The Breeding Bird Survey 2007, BTO Research Report 508, British Trust for Ornithology, Thetford.