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Feeding ecology of Common Guillemots on Lundy: chick diet
Feeding ecology of Common Guillemots on Lundy
Summary

The only published data on chick diet on Lundy comes from Hatchwell et al. (1992) & Anderson et al. (2014).


Table 1: Species composition of fish fed to chicks on Lundy (Preliminary data)

	No of   % of    No of   % of    
        Sprat  Sprat    Sandeel Sandeel

2014	
2013	
2012	
2011	
2010	
2008	

2006-11  9      33%      18     66%     Anderson et al. (2014)

1986	86	52%	 78     48%     Hatchwell, et al. (1992)
1985	44      19%     190     81%	Hatchwell, et al. (1992)


Table 2: Size composition of fish fed to chicks on Lundy (Preliminary data)

	No of   % of    No of   % of    No of   % of 
        Small   Small   Medium  Medium  Large   Large

2014	
2013	
2012	
2011	
2010	
2008	

1986	76      46%      88     54%      0      -       Hatchwell, et al. (1992)
1985	44      19%     130     56%     60      26%     Hatchwell, et al. (1992)

Prey size classes (Hatchwell, et al. 1992):
Clupeids: Small 80-100mm, Medium 100-120mm, Large 120-140mm
Sandeels: Small 80-110mm, Medium 110-140mm, Large 140-170mm



Articles on the chick diets of Lundy's Common Guillemots

  • Anderson, H.B., Evans, P.G.H., Potts, J.M., Harris, M.P. & Wanless, S. (2014) "The diet of Common Guillemot Uria aalge chicks provides evidence of changing prey communities in the North Sea" Ibis 156:23-34
    [notes]
    http://dx.doi.org/10.1111/ibi.12099
  • Hatchwell, B.J., Birkhead, T.R., Goodburn, S.F., Perrins, J.M. & Jones, S.E. (1992) "Chick diets and food intake of nestling Common Guillemots Uria aalge: an inter-colony comparison" Seabird 14:15-20
    • Summary The feeding ecology of Common Guillemot chicks at two colonies, Skomer and Lundy Islands, situated 75km apart in the south Irish Sea was compared over two years. The diets of chicks varied significantly between colonies, with Lundy chicks fed on smaller prey than those on Skomer. However, chicks were fed more frequently on Lundy so the estimated daily energy intake was similar at both colonies. Parents on Lundy made shorter foraging trips than on Skomer. Chick diet and foraging ranges indicated little overlap in foraging areas. Fish fed to chicks were generally of higher quality than those used for display.
    • [notes]

  • Birkhead, T.R., Goodburn, S.F. & Hatchwell, B.J. (1986) "Feeding Ecology of Common Guillemot Chicks on Lundy" Annual Report of the Lundy Field Society 1985 36:25-26
    • Summary Following a long period of decline, several guillemot Uria aalge populations in the south Irish Sea have recently shown an upward trend in numbers. At present the reason for this change in fortunes is not known, but one possibility is that a change in the marine environment has made food more available to guillemots. As part of an attempt to examine this, we have compared several aspects of the guillemot's feeding ecology at three Irish Sea colonies during the chick rearing period. Information has been collected from Skomer Island, Dyfed, Great Saltee, Co. Wexford and from Lundy. Here we present the results from Lundy made between 17th-28th June 1985 about 100m south of St Mark's Stone on the west coast of the island. All observations were made between 1400-1800h BST.
    • [notes]

  • More articles on Lundy's Common Guillemots

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