Another source of information I am currently seeking is old Bird Observatory reports - pre 1977. Thus far I have managed to source reports for Rathlin Island BO and Tory Island BO from the 60's and a large portion from Copeland BO reports. I have also received a full record for Cape Clear BO from Birdwatch Ireland going back to the 60's. I have yet to get any feedback for Saltee BO, Loop Head BO and Malin Head BO, so if you have any contacts, please let me know.
As the data, pre 1975, is limited, I will only focus only scarcities and rarities in that period. The current Irish ringing species list I have accrued stands at over 270 species, although a few sub species need removing and there a few new species to add, particularly yanks.
The data of course is not perfect, with overlooked late submissions, altered records, missing data, mistakes by previous editors and my own mistakes. This is unlikely to change for the foreseeable, until the BTO finally track back and digitise all the historic ringing data.... which might take a decade or two. Where possible, I have tried to remove old records that have since been deemed unacceptable by the IRBC, particularly for the likes of Greenish, Bonelli's and Olivaceous Warblers.
The data should therefore be taken at face value - it isn't perfect but is representative and fit for purpose.
I will try and graph the 'All Ireland' totals from 1975, with North and South separate from 1977. At this stage I will focus on passerines, near passerines and birds of prey. I will also map the recoveries of these groups coming into and out of Northern Ireland, for the species with many recoveries and all Ireland for those with few (but omitting most inter Irish movements).
The data will go in someway to present the population trends in some species but for some species it is flawed. Changes in techniques, improved equipment, the use of tape lures, the number of ringers & their effort, the closure of Bird Observatories, BTO periodic species targets (i.e. Swallow Roosts, Sedge Warblers in Ireland) and changes in birds behaviour (Finch species visiting feeders for example) etc. all have a huge affect, meaning it is not truly representative.
The BTO has national standardised programmes in place such as Constant Effort Site (CES) scheme and Retrapping Adults for Survival (RAS) scheme which are fantastic for assessing population dynamics, along with the Nest Record Scheme (NRS).
I will update the list below as I gradually filter out the species, post by post!
Species Links
Barn Owl
http://causewaycoastrg.blogspot.co.uk/2016/01/irish-bird-ringing-data-owls.html
Long-eared Owl
http://causewaycoastrg.blogspot.co.uk/2016/01/irish-bird-ringing-data-owls.html
Short-eared Owl
http://causewaycoastrg.blogspot.co.uk/2016/01/irish-bird-ringing-data-owls.html
Goldcrest
http://causewaycoastrg.blogspot.co.uk/2015/12/irish-bird-ringing-data-crests-and-tits.html
Firecrest
http://causewaycoastrg.blogspot.co.uk/2015/12/irish-bird-ringing-data-crests-and-tits.html
Blue Tit
http://causewaycoastrg.blogspot.co.uk/2015/12/irish-bird-ringing-data-crests-and-tits.html
Great Tit
http://causewaycoastrg.blogspot.co.uk/2015/12/irish-bird-ringing-data-crests-and-tits.html
Coal Tit
http://causewaycoastrg.blogspot.co.uk/2015/12/irish-bird-ringing-data-crests-and-tits.html
Bearded Tit
http://causewaycoastrg.blogspot.co.uk/2015/12/irish-bird-ringing-data-crests-and-tits.html
Long-tailed Tit
http://causewaycoastrg.blogspot.co.uk/2015/12/irish-bird-ringing-data-crests-and-tits.html
Blackcap
http://causewaycoastrg.blogspot.co.uk/2016/02/irish-bird-ringing-data-tree-grass-and.html
Garden Warbler
http://causewaycoastrg.blogspot.co.uk/2016/02/irish-bird-ringing-data-tree-grass-and.html
Barred Warbler
http://causewaycoastrg.blogspot.co.uk/2016/02/irish-bird-ringing-data-tree-grass-and.html
Lesser Whitethroat
http://causewaycoastrg.blogspot.co.uk/2016/02/irish-bird-ringing-data-tree-grass-and.html
Whitethroat
http://causewaycoastrg.blogspot.co.uk/2016/02/irish-bird-ringing-data-tree-grass-and.html
Subalpine Warbler
http://causewaycoastrg.blogspot.co.uk/2016/02/irish-bird-ringing-data-tree-grass-and.html
Grasshopper Warbler
http://causewaycoastrg.blogspot.co.uk/2016/02/irish-bird-ringing-data-tree-grass-and.html
Icterine Warbler
http://causewaycoastrg.blogspot.co.uk/2016/02/irish-bird-ringing-data-tree-grass-and.html
Melodious Warbler
http://causewaycoastrg.blogspot.co.uk/2016/02/irish-bird-ringing-data-tree-grass-and.html
Ring Ouzel
http://causewaycoastrg.blogspot.co.uk/2015/12/irish-bird-ringing-data-thrushes.html
Blackbird
http://causewaycoastrg.blogspot.co.uk/2015/12/irish-bird-ringing-data-thrushes.html
Fieldfare
Song Thrush
http://causewaycoastrg.blogspot.co.uk/2015/12/irish-bird-ringing-data-thrushes.html
Redwing
http://causewaycoastrg.blogspot.co.uk/2015/12/irish-bird-ringing-data-thrushes.html
Mistle Thrush
http://causewaycoastrg.blogspot.co.uk/2015/12/irish-bird-ringing-data-thrushes.html
Spotted Flycatcher
http://causewaycoastrg.blogspot.co.uk/2015/11/irish-bird-ringing-data-pied-red.html
Red-breasted Flycatcher
http://causewaycoastrg.blogspot.co.uk/2015/11/irish-bird-ringing-data-pied-red.html
Pied Flycatcher
http://causewaycoastrg.blogspot.co.uk/2015/11/irish-bird-ringing-data-pied-red.html
Greenfinch
http://causewaycoastrg.blogspot.co.uk/2015/11/irish-ringing-data-goldfinch-and.html
Goldfinch
http://causewaycoastrg.blogspot.co.uk/2015/11/irish-ringing-data-goldfinch-and.html
Other ringed species without focus:
Scops Owl - See Owls
Snowy Owl - See Owls
Little Owl - See Owls
Ruby-crowned Kinglet - See Crests
Dartford Warbler - See Sylvia Warblers
Pallas's Grasshopper Warbler - See Grass Warblers
Booted Warbler - See Tree Warblers
Eastern Olivaceous Warbler - See Tree Warblers
White's Thrush - See Thrushes
Grey-cheeked Thrush - See Thrushes
Collard Flycatcher - See Flycatchers
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