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Feeding ecology of Common Guillemots on Lundy: productivity
Feeding ecology of Common Guillemots on Lundy
Summary

The published data on Guillemot productivity on Lundy comes from five years: 2007 (Dalrymple, S. 2008), 2008 (Wheatley, S. & Saunders, N. 2010), 2009 and 2010 (Wheatley, S. & Saunders, N. 2011), and 2013 (MacDonald, R. 2014)


Table 1: Productivity on Lundy from this study (Preliminary data)

        Focal   Active  Regular Young   Produc- Colony                  
        Sites   Sites   Sites   Raised  tivity
2015    19      17      1       13      (0.68)  St Philip's Stone       
2014    16+     15      1+      12      (0.75)  St Philip's Stone       
2013    17+     14      3+      10      (0.59)  St Philip's Stone
2012    17+     11      6+      11      (0.65)  St Philip's Stone
2011    17+     15      2+      12.5    (0.74)  St Philip's Stone
2010    17+                     8       (0.47)  St Philip's Stone
2008    17+                     9       (0.53)  St Philip's Stone

Table 2: Productivity on Lundy from published sources

        Breeding Young  Produc- Colony          Source    
        Attempts Raised tivity

2013    27       19     0.70    St Mark's Stone MacDonald (2014)
2013    13        7     0.59    Inland of St Mark's Stone MacDonald (2014)

2010    45       32     0.71    Long Roost      Wheatley & Saunders (2011)
2010    34       22     0.65    Aztec Bay       Wheatley & Saunders (2011)

2009                    0.69    Long Roost      Wheatley & Saunders (2011)
2009                    0.55    Aztec Bay       Wheatley & Saunders (2011)

2008    57       20     0.35    Long Roost      Wheatley & Saunders (2010)

2007    72       24     0.33    St Mark's Stone Dalrymple (2008)
2007    70       17     0.24    Long Roost      Dalrymple (2008)


  • Productivity in 2016
  • Productivity in 2015 In 2015 there were 19 focal sites on my St Philip's Stone survey ledge. There were 17 active sites and 2 regular sites. 13 sites produced chicks that either fledged, or were of fledging age (+15days old) when last seen. This gives a productivity of 68%. Of these 13 chicks, at least one failed post fledging.
  • 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%.

Articles on the productivity of Lundy's Common Guillemots

  • MacDonald, R. (2014) "Lundy Warden's Report" Annual Report of the Lundy Field Society 2013 63:14-15
    [notes]
    Annual Report of the Lundy Field Society 2013 63
  • Wheatley, S. & Saunders, N. (2011) "Cliff nesting Seabird Productivity on Lundy 2010" Annual Report of the Lundy Field Society 2010 60:67-74
    • Abstract The productivity of Black-legged Kittwake (Rissa tridactyla), Common Guillemot (Uria aalge), and Northern Fulmar (Fulmaris glacialis) was surveyed at six sites on Lundy in 2010. Average Kittiwake productivity was 0.67 per pair, average Guillemot productivity 0.68, and average Fulmar productivity 0.52. Increases in productivity were noted for all species in comparison to previous years.
    • [notes]

  • Wheatley, S. & Saunders, N. (2010) "Cliff nesting sea bird productivity on Lundy 2008" Journal of the Lundy Field Society 2:85-90
    • Abstract The productivity of Black-legged Kittwake [Rissa tridactyla], Common Guillemot [Uria aalge], and Northern Fulmar [Fulmaris glacialis] was surveyed at four sites on Lundy in 2008. Average Kittiwake productivity was 0.13 per pair, average Guillemot productivity 0.35, and average Fulmar productivity 0.3 with little variation in species productivity between each study site. Predation was seen at two sites and rainfall was high suring the season.
    • [notes]

  • Dalrymple, S. (2008) "Cliff nesting sea bird productivity on Lundy 2007" Journal of the Lundy Field Society 1:41-46
    • Abstract The productivity of Black-legged Kittiwake (Rissa tridactyla), Common Guillemot (Uria aalge), and Northern Fulmar (Fulmaris glacialis) was surveyed at four sites on Lundy in 2007. Average kitttiwake productivity was 0.3 per pair, average guillemot productivity 0.27, and average fulmar productivity 0.54 but there were some differences between each study site. There was little evidence of food shortages, but high predation was seen at one site and weather conditions were poor throughout the season.
    • [notes]
    • Journal of the Lundy Field Society 1

  • More articles on Lundy's Common Guillemots

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