West Weald Landscape Project Conference: Pearl-bordered fritillaries

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Presentation from West Weald Landscape Project Conference 22 May 2014

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West Weald Landscape Project Conference: Pearl-bordered fritillaries

  1. 1. South Downs National Park Authority A species on the brink Pearl-bordered Fritillary Dan Hoare Butterfly Conservation
  2. 2. 70% of butterflies are in decline Thomas, J.A. et al. 2004, Science 303, 1879. Datasets from last 20-40 years
  3. 3. Habitat specialists (blue) and wider countryside species (red)
  4. 4. Woodland (green) and farmland (brown)
  5. 5. Woodland butterflies by habitat 0 50 100 150 200 250 1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 2009 Index(1985=100) Rides Clearings Mature All -80%
  6. 6. Pearl-bordered Fritillary
  7. 7. Declining abundance • 66% population decline since 1976 • 46% decline from 1995-9 to 2005-9
  8. 8. Declining distribution • 61% distribution decline 1970-2004 • 43% decline in occupied 10km squares in 10 years
  9. 9. South East colonies since 1995
  10. 10. South East colonies • 12 established sites (more than 50 extinctions since 1990s) • 2 recent colonisations on chalk grassland • 3 ongoing reintroductions
  11. 11. Landscape boundary Woodland sites Landscape-scale species conservation
  12. 12. Landscape boundary Unmanaged 2007 Managed 2007 Tytherley Woods 2007
  13. 13. Landscape boundary Unmanaged 2007 Managed 2007 Pearl-bordered Fritillary 2007 Pearl-bordered Fritillary 2007
  14. 14. Landscape boundary Unmanaged 2007 Managed 2007 Pearl-bordered Fritillary 2007 2km focal area around colonies Targeted management 2007-11
  15. 15. Landscape boundaryLandscape boundary Unmanaged 2010 Managed 2010 Pearl-bordered Fritillary 2007 2km focal area around colonies Targeted management 2007-11
  16. 16. Pearl-bordered Fritillary colonisations 2008-2011 Landscape boundary Unmanaged 2010 Managed 2010 Pearl-bordered Fritillary 2007 2km focal area around colonies Colonisations 2008-11
  17. 17. South East colonies • species can be brought back from the brink with targeted effort • species responses demonstrate the success of habitat management • but it takes a lot of effort...
  18. 18. Biological Records Centre

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