References
Effeithiau newid yn yr hinsawdd ar adar Cymru
Cyfeiriadau
Llyfrau a Chyhoeddiadau
Books & Publications
Birds in Wales. 1994. Lovegrove, Williams & Williams. Poyser.
Birds in Wales 1992-2000. 2002. Green, J. Welsh Ornithological Society.
Welsh Bird Reports. Shrubb, M, then Green, J. Welsh Ornithological Society.
Pembrokeshire Bird Reports
Web sites
RSPB – rspb.org.uk
“State of the Birds in Wales”.
BTO – www.bto.org.uk
Breeding bird Survey – Population changes for Species in Wales
Bird Trends
Breeding birds in the wider countryside
Migratory Birds and Climate Change
The effect of Climate Change on Birds
Climate change and egg-laying dates
The Wetland Bird Survey
Wader shift their winter distributions
Photos
All photographs are copyrighted by their respective photographers.
Those of Hobby, Fieldfare, Redwing and Balearic Shearwater are taken from Google.
Acknowledgements
Andy Musgrove, from the BTO, WEBS data.
Dr. R.B. Wynn, from the National Oceanography Centre, for extra information on seabird changes in relation to the food chain.
Several charts are taken from the BTO website.
The various photographers, who have allowed the use of their material.


