Summary


Presentation Outline

  1. Video: Normal feeding 17th June 2012
    Discuss behaviour and methods of recording data.
  2. Slide: Recordable data
    • Provisioning rates
    • Parental attendance
    • Feeding-trip duration
    • Chick diet
    • Productivity

  3. Slide: Transcribing data
    Discuss
  4. Slide: Lundy data early 2012
  5.  Date          Chick.hours	Both adults     Both adults
                                    at nest (time)  at nest (%)
    11/06/12	 8:00:00	  :53:14	11.09%
    13/06/12	20:00:00	 2:35:20	12.94%
    
    17/06/12	22:00:00	 5:19:06	24.17%
    
    	Bravo      :  :     : 2:56    =    2m56s
    	Charlie    :  :     :  :      =       0s
    	Echo       : 6:58   :18:29    =   25m27s
    	Foxtrot    :  :     :  :      =       0s
    	Hotel      :  :     :43:11    =   43m11s
    	India      :  :     :39:05    =   39m05s
    	November   :  :     : 2:23    =    2m23s
    	Oscar      :17:18   :27:33    =   44m51s
    	Papa       : 8:27   :47:49    =   56m16s + 52.5s
    	P or Q     : 1:45
    	Quebec     :  :     :17:34    =   17m34s + 52.5s
    	Sierra     :25:38  1:00:00    = 1h25m38s
    
    18/06/12	22:00:00	 2:18:30	10.49%
    20/06/12	22:00:00	 2:25:51	11.05%
    

  6. Video: Abandonment 2nd July 2012
    Discuss food shortages North Sea
  7. Slide: Lundy data early vs late 2012
  8.  Date          Chick.hours	Both adults     Both adults
                                    at nest (time)  at nest (%)
    27/06/12	18:00:00	  :22:37	 2.09%
    28/06/12	18:00:00          :-4:17        -0.40%
    29/06/12	18:00:00	  :22:00	 2.04%
    30/06/12	18:00:00	 3:41:04	20.47%
    01/07/12	18:00:00	 1:47:48	 9.98%
    
    02/07/12	14:00:00         -:22:41        -2.70%
    
    	Bravo      :  :     :  :  
    	Foxtrot    :  :     :  :  
    	India      :  :     :  :  
    	November   :  :    -:22:41
    	Oscar      :  :     :  :  
    	Quebec     :  :     :  :  
    	Sierra     :  :     :  :  
    
    

  9. Slide: Lundy data 2012-2016
  10. Time	2012E	2012L	2013	2014	2015    2016
    (mins.)
    -55	 0	 1	 0	 0	 0       0
    -25	 0	 1	 0	 0	 0       0
      5	25	37	64	51	65      68
     15	 8	 7	20	13	17       8
     25	 4	 3	12	14	13       6
     35	 2	 0	 5	 8	 3       6
     45	 4	 0	 4	 9	 3       5
     55	 1	 1	 2	 3	 2       1
     65	 0	 1	 2	 5	 2       2
     75	 1	 0	 3	 2	 2       6
     85	 2	 0	 2	 3	 1       2
     95	 0	 0	 1	 2	 1       0
    105	 0	 1	 2	 3	 0       0
    115	 0	 0	 2	 0	 1       1
    
    N=	47	52	119	113	110     105
    
    PA=     14.37%  5.55%   15.19%  19.94%  12.29%  14.04%
    
    p=		<.05		<.01	     
    
    

  11. Parental attendance
    Reasons for variation
    • Ledge size
    • Predation
    • Food availability
    • Time budgets

  12. Slide: Global colonies (Gaston 1998)
    Discuss links between food abundance and parental attendance
  13. Slide: Cook Inlet colonies (Harding et al. 2007)
    Discuss variation in attendance
  14. Slide: Celtic Sea colonies (Seabird 2000)
    Discuss differences between Skomer and Lundy
  15. Slide: Feeding ecology Skomer vs Lundy (Hatchwell et al. 1992)
    Discuss variation in feeding rates and fish sizes
    Discuss lack of attendance data
  16. Slide: Time budgets (Cairns et al. 1987)
    Discuss flexibility in time budgets
  17. Slide: Wing loading
    Discuss costs of flying and diving
  18. Slide: Buoyancy (Watanuki et al. 2006), drag (Lovvorn et al. 2001), and temperature (Daunt et al. 2003)
    Discuss costs of diving
  19. Slide: Energetic costs of searching (Thaxter et al.2013)
    Discuss
  20. Slide: Ashmole's Halo (Birt et al. 1987)
  21. Slide: Celtic Sea stratification (Hickman et al. 2012)
  22. Slide: Celtic Sea Front (Miller & Christodoulou 2014)
  23. Slide: Chlorophyll (from SeaWiFS)
  24. Slide: Seasonal changes (1)
    Zooplankton in Bristol Channel (Collins & Warwick 1982)
    Phytoplankton in Celtic Sea (Joint et al. 1986)
    Seasonal stratification (Miller & Christodoulou 2014)
  25. Slide: Seasonal changes (2)
    Guillemots on Lundy (Perry 1940)
    Sprats in "the vicinity of South Wales" (Williams 1984 quoted in Hatchwell 1991)
    Sandeels in Langstone Harbour (Reay 1973 quoted in Hatchwell 1991)
    Zooplankton in Bristol Channel (Collins & Warwick 1982)
  26. Slide: Conclusions
    • Parental attendance in late 2012 was significantly lower than other years.
    • Low parental attendance has been linked to poor food availability at several Common Guillemot colonies around the world.
    • There was no evidence of poor feeding amongst Guillemots at Skomer in 2012 (although Kittiwake productivity was low)
    • Local sea conditions around Lundy make it more susceptable to variations in fish stocks
    • Poor weather in April 2012 may be a factor


References

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