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Birds' interactions with the landscape - BTO research from global to local

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Talk of Andy Clements, director of the BTO, on the Landelijke Dag 2013.

Talk of Andy Clements, director of the BTO, on the Landelijke Dag 2013.

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  • Blue line shows unsmoothed (annual) trend and the red line shows the smoothed trend, with confidence limits
  • The use of this stop-over occurs during a period when recent drought-breaking rains associated with the northward advance of the Inter-tropical Convergence Zone (ITCZ) have created a burst of invertebrate availability.
    Since the timing of the rainfall associated with the ITCZ is determined by global climatic systems & ultimately by astronomical events, rather than by local or regional conditions, use of this stop-over has the potential to constrain arrival time advancement by early breeding populations needing to respond to local warming on the breeding grounds.
  • The sub-Saharan sections of the migrations of several species of Afro-Palaearctic migrants breeding in Britain and wintering in central and southern Africa have been very poorly known until recently, due to low numbers of and biases in ringing recoveries, together with incomplete appreciation of the seasonal distribution of several species. The tracking of individual migrants with geolocators and satellite radio-tags has illuminated the movements of several species south of the Sahara, providing new and unexpected insights.
  • It’s not just migrants that are showing these striking patterns.
    Fascinating increase in abundance in Ireland.
    Atlas data valuable for understanding past drivers of change and making predictions, the comprehensive nature of the atlas really comes into their own because they include results across all species.
  • Transcript

    • 1. Birds’ interactions with the landscape – BTO research from global to local Dr Andy Clements, BTO
    • 2. Not just counting birds • Impartial evidence • Professionals + 50,000 volunteers • Extensive data + intensive research • International Photo: Chris Wernham
    • 3. Declining migrants Net population changes during the period 1967-2005. BTO BBS data 1967-2005. In Newton 2010. Photo: Jill Pakenham
    • 4. What 100 years of ringing tells us Photo: Amy Lewis
    • 5. Satellite tracking Unbiased information Complete annual cycle Actual migration track – route, stop-overs and wintering destinations Interactions between conditions and events Photo: Phil Atkinson
    • 6. Cuckoo population trends Data: BTO/RSPB/JNCC Breeding Bird Survey. Photo: Amy Lewis
    • 7. Where are they now? Photo: Phil Atkinson
    • 8. Photo: Juan Pablo Moreiras / Fauna & Flora International
    • 9. African coast NW Morocco Northern Italy Southern France NorthernSpain 60 50 40 30 20 10 0 Sussex/Antwerp Number of days How long did they stop over? Arid Zone 51 45 39 33 27 21 15 9 Degrees North Photo: Amy Lewis Humid Zone 3 -3
    • 10. 2011 2012 7 June – 10 July 16 June – 3 July 8-13 April 7 – 20 July 10-29 April 19 July – 19 August 16 March – 1 April 25 July – 1 October 28 August – 17 September 16 March – 2 April
    • 11. Timing of pre-Sahara crossing stopovers of Common Cuckoos in West Africa Mean Duration 13.7 (7.8 sd) days Mean Total Duration 29.1 (8.2 sd) days <              FEBRUARY              ><                    MARCH                    ><                  APRIL                     >     1 2 3 4                                         2012                                                                                                                                                                                                                                                       2013 5 6 2 7 8                                                                                                                                                                                                                                                                                                                                                       00 0 00 0 1 1 11 22 1 1 1 11 1 1 2 2 1 2 2 22 33 3 3 3 12 35 6 66 7 5 5 55 67 7 7 7 88 8 7 7 7 77 7 77 66 52 4 55 54 4 43 3 1 1 11 11 1 1 0 00 0 0 0 0 00 Photo: Amy Lewis
    • 12. Spring
    • 13. Timing of pre-Sahara crossing stopovers of Common Swifts in West Africa 23Mar  2011 1 2 3 4 5 6 7 8 9 10Apr  12Apr  14Apr  16Apr    18Apr  20Apr  22Apr  24Apr  26Apr  28Apr  02Ma y  30Apr  04Ma y  06Ma y                                                                                                                                                                              14Ma y     12Ma y      10Ma y      08Ma y                                        N O N E 2012 6 10 11 8 4                                                                                         N O N E   2013 12 13 14 15 16 N N                                                                                                                                                                                 1 1 1 1 1 1 2 2 3 5 5 5 9 10 11 13 13 14 15 15 13 14 13 12 12 12 11 9 4 3 3 2 2 2 2 2 0
    • 14. ITCZ and rainfall mid-winter
    • 15. ITCZ and rainfall late March
    • 16. Rainfall late February Photo: Amy Lewis
    • 17. Rainfall late March Photo: Amy Lewis
    • 18. Rainfall late April Photo: Amy Lewis
    • 19. • Use of previously unsuspected stop overs in West Africa by several species • Use of this stop over occurs when droughtbreaking rains associated with ITCZ cause a burst of insect availability • Spring migration strategies of particular importance as they have the potential to strongly influence arrival times of the earlybreeding British populations
    • 20. Arrival dates Difference in median arrival date (days) Difference in median arrival date between Inland Observation Points (1963–66) and BirdTrack / Migration Watch (2002–10) Data: Newson in prep. Photo: John Harding
    • 21. We did it! Dawn Balmer et al.
    • 22. Headline statistics • c.40,000 observers • c.19 million records • >3,850 10-kms • >182,000 TTVs • >50,000 tetrads • >500 species Photo: John Harding
    • 23. Header (title of slide) Main body text Source: xxxxxxx
    • 24. Header (title of slide) Main body text Source: xxxxxxx
    • 25. Change in abundance averaged across migrants
    • 26. Change in abundance averaged across raptors
    • 27. Wetland birds Ducks, geese & swans
    • 28. Farmland birds •Large range contractions 1970 – 1990 •No marked recent range expansions •Continued range contractions in some species Photo: Jill Pakenham
    • 29. B=-56% I=-100%
    • 30. B=-17% I=-53%
    • 31. Change in abundance averaged across waders
    • 32. B=+25% I=+249%
    • 33. Photo: Edmund Fellowes
    • 34. Photo: Chas Holt and Edmund Fellowes
    • 35. Deer and Nightingales Habitat available Habitat used Coppice >9 years (unprotected) Young coppice with deer Young coppice deer excluded ????. Photo: Chris Hewson Photo: Edmund Fellowes
    • 36. The spread of Muntjac 1996 Data: BTO/RSPB/JNCC Breeding Bird Survey. Photo: Mike Toms 2007
    • 37. Happy Birthday Sovon Thanks to: Sovon for the invitation to speak Professor Ian Newton, FRS; Professor Tim Birkhead, FRS BTO staff: Graham Appleton; Phil Atkinson; Dawn Balmer; Rob Fuller; Chris Hewson; Chas Holt; Dario Massimino; Nick Moran; Andy Musgrove; Nancy Ockenden; James Pearce-Higgins; Nicki Read; Paul Stancliffe; Mike Toms Mike McCarthy Cornell Lab of Ornithology, Ithaca NY USA Ghana Wildlife Society; Naturama; RSPB; BirdWatchIreland; Scottish Ornithologists Club Essex & Suffolk Water, BBC Wildlife Fund, Mark Constantine & The Sound Approach, and all our individual Cuckoo sponsors Our fabulous BTO volunteers who have collected all the data And to all of you for coming. Photo: Rebecca Nason