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Productivity of Common Guillemots
Common Guillemot
Measures of productivity


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  • Feeding ecology of Common Guillemots on Lundy: productivity
    • Productivity in 2014 In 2014 there were 16 focal sites on my St Philip's Stone survey ledge. Site H was unoccupied this year, perhaps due to the severe storms of winter 2013-14. There were 15 active sites and one regular site. 12 sites produced chicks that either fledged, or were of fledging age (+15days old) when last seen. This gives a productivity of 75%. Of these 12 chicks, at least one failed post fledging.
    • Productivity in 2013 There were 14 active sites and at least 3 regular sites. 10 sites produced chicks that either fledged, or were of fledging age (+15days old) when last seen. This gives a productivity of no more than 59%. Of these 10 chicks, at least 3 failed after 15 days, either through chick lost or post-fledging failure.
    • Productivity in 2012 There were 11 active sites and at least 6 regular sites. 11 sites produced chicks that either fledged, or were of fledging age (+15days old) when last seen. This gives a productivity of no more than 65%. Of these 11 chicks, at least one failed after 21 days.
    • Productivity in 2011 There were 15 active sites and at least 2 regular sites. 12.5 sites produced chicks that either fledged, or were of fledging age (+15days old) when last seen. This gives a productivity of no more than 74%.
    • Productivity in 2010 There were at least 17 focal sites. 8 sites produced chicks that either fledged, or were of fledging age (+15days old) when last seen. This gives a productivity of no more than 47%.
    • Productivity in 2008 There were at least 17 focal sites. 9 sites produced chicks that either fledged, or were of fledging age (+15days old) when last seen. This gives a productivity of no more than 53%.
  • Common Guillemot

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