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methods

Breeding season

Relative abundance

VISIT EVERY SQUAR

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Timed Tetrad Visits

Roving Record

sSet conservation prioritiesWinter

Fou

r years

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Distribution

c.17,000 volunteer observers

Records from c.40,000 observers

19 million records received

c.3,850 10-km squares

c.50,000 tetrads

>500 species/subspecies

Fantastic participation

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Targets in coverage met

Winter

BreedingWinter

Just 0.004% of land area not surveyed in breeding season

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Target of 8 TTVs met in >96% of 10-km squares

45 concurrent local atlases Every dot shows a surveyed tetrad

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Data from many sources

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Key story 1: success for waterbirds

Has colonised and now confirmed breeder in 164 10-km squares

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Little Egret

Key story 2: mixed news for farmland birds

How does the mix of gains and losses for Tree Sparrow relate to

land management?

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61% range contraction in Ireland and 21% in Britain over 40 years 9 of 22

Yellowhammer

Key story 3: contrast for woodpeckers

Great Spotted Woodpeckers have colonised Ireland and spread

northwards in Scotland

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Green Woodpeckers have been lost from squares in Wales yet the

range has expanded in the east

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Key story 4: breeding waders mostly declining

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Key story 5: relative abundance patternsA distinct SE/NW pattern of change in relative abundance apparent for many

species over the last 20 years

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Willow Warbler

Key story 6: increasing abundance in Ireland

Blue Tits have increased in abundance in Ireland over the last 20 years

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Key story 7: long-distance migrants

Whinchats have contracted in range by 76% in Ireland and 47% in Britain over

the last 40 years

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Key story 8: non-natives increasing

There has been a 1,144% increase in the number of 10-km squares occupied by

Mandarin Ducks in the breeding season

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Key story 9: mixed news for seabirds

There has been a notable expansion of inland Common Tern colonies in England yet losses in coastal squares in Scotland,

Wales and Ireland.

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Key story 10: mostly good news for birds of prey

Buzzards are now widespread in Britain, and in much of Ireland, in the

breeding season

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The Short-eared Owl’s British breeding range has contracted by

48% over the last 40 years

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There are many surprising stories……

Blackcaps have increased in both range and abundance. The range in Ireland has expanded by 249%

over 40 years

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…...and many complex patterns to unravelChange in relative

abundance for woodland species

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The book is just the start

Thanks to our funders and volunteers we have now collected the records and produced the book.

Now begins the exciting programme of research to explain all these changes

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