Summary
Presentation Outline
- Video: Normal feeding 17th June 2012
Discuss behaviour and methods of recording data.
- Slide: Recordable data
- Provisioning rates
- Parental attendance
- Feeding-trip duration
- Chick diet
- Productivity
- Slide: Transcribing data
Discuss
- Slide: Lundy data early 2012
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%
- Video: Abandonment 2nd July 2012
Discuss food shortages North Sea
- Slide: Lundy data early vs late 2012
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 : : : :
- Slide: Lundy data 2012-2016
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
- Parental attendance
Reasons for variation
- Ledge size
- Predation
- Food availability
- Time budgets
- Slide: Global colonies (Gaston 1998)
Discuss links between food abundance and parental attendance
- Slide: Cook Inlet colonies (Harding et al. 2007)
Discuss variation in attendance
- Slide: Celtic Sea colonies (Seabird 2000)
Discuss differences between Skomer and Lundy
- Slide: Feeding ecology Skomer vs Lundy (Hatchwell et al. 1992)
Discuss variation in feeding rates and fish sizes
Discuss lack of attendance data
- Slide: Time budgets (Cairns et al. 1987)
Discuss flexibility in time budgets
- Slide: Wing loading
Discuss costs of flying and diving
- Slide: Buoyancy (Watanuki et al. 2006),
drag (Lovvorn et al. 2001), and temperature (Daunt et al. 2003)
Discuss costs of diving
- Slide: Energetic costs of searching (Thaxter et al.2013)
Discuss
- Slide: Ashmole's Halo (Birt et al. 1987)
- Slide: Celtic Sea stratification (Hickman et al. 2012)
- Slide: Celtic Sea Front (Miller & Christodoulou 2014)
- Slide: Chlorophyll (from SeaWiFS)
- Slide: Seasonal changes (1)
Zooplankton in Bristol Channel (Collins & Warwick 1982)
Phytoplankton in Celtic Sea (Joint et al. 1986)
Seasonal stratification (Miller & Christodoulou 2014)
- 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)
- 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
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