• Provisioning rates Preliminary provisioning rate of 0.29 feeds per chick hour
    (61 feeds / 214 chick.hours = 1.14 feeds per chick per 4 hours).
  • Parental attendance Mean time that both parents were at nest site was 20.17% (=46h47m21s/232h00m00s). There was only one case of a chick being left unattendended by both parents - on 3rd July "Neolithic" was left for 4m34s after a fight dislodged it's parent from the ledge.
  • Feeding-trip duration 31 timed feeds out of 77 (40.26%). Mean duration of timed feeds = 32m55s, median duration = 23m10s.
  • Chick diet in 2014
  • Productivity In 2014 there were 16 focal sites on my St Philip's Stone survey ledge. 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%
  • Pre-breeding attendance 2013-2014

 2014  20   21   29   30   01   02   03   04   06   08 | total
05h45 .... 1/10 .... .... 2/11 .... .... .... 1/11 ... |  4/33
06h00 .... 3/10 .... .... 1/11 1/11 0/12 .... 2/11 2/8 |  9/63
06h15 .... 1/10 .... 1/11 1/11 2/11 2/12 0/12 1/11 0/8 |  8/86
06h30 3/10 .... .... 1/11 0/11 0/11 0/12 1/12 2/11 0/8 |  7/86
06h45 0/10 0/10 .... 1/11 .... .... 1/12 1/12 .... ... |  3/55
07h00 0/10 0/10 0/11 .... 2/11 1/11 .... .... 1/11 0/8 |  4/72
07h15 .... 0/10 2/11 0/11 0/11 1/11 1/12 0/12 2/11 1/8 |  7/97
07h30 0/10 .... 0/11 2/11 0/11 0/11 2/12 1/12 0/11 0/8 |  5/97
07h45 1/10 .... .... 0/11 .... .... 0/12 0/12 .... ... |  1/45
08h00 0/10 .... 0/11 .... .... .... .... .... .... ... |  0/21
08h15 .... .... 0/11 .... .... .... .... .... .... ... |  0/11
08h30 .... .... 0/11 .... .... .... .... .... .... ... |  0/11


Methods

The ledge was monitored using a Canon XL2 video camera with a Canon 100-400mm L lens. This camera records Standard Definiton 25p PAL video on to 60 minute miniDV tapes, in practice these tapes produce just over 62 minutes of usable video. Between 5th June and 17th July, 38 tapes were recorded over 20 days (one tape on the 13th June, one on the 17th July, two tapes on the other 18 days). The tapes were captured onto computer using Sony Video Capture 6.0e and edited using Sony Vegas Pro 8.0b. Corrupt video at the beginning or end of a recording was deleted. For those measurements where a standard length of time is needed (provisioning rate, parental attendance, etc.) only the first 60 minutes of video was used.

Focal sites were identified by the presence of an incubating or brooding adult, or by the presence of a pair of birds. Pairs were identified by mutual interactions; particularly mutual preening, or displays. For transcription purposes, adults were noted with their focal site letter and a number. For each day, the initially brooding bird was number 1, and the non-brooding bird was number 2.



2014 Transcripts

  • G140721 4 adults, no chicks, no eggs, from binoculars
  • G140717 07h15m55s - 08h18m26s: 1 chick, no feeds
  • 14/07/14 Summary 1 chick, 4 feeds.
  • G140714A 06h24m04s - 07h26m35s: 2 feeds
  • G140714B 07h28m17s - 08h31m03s: 2 feeds
  • 11/07/14 2 chicks, 4 feeds. Stereo audio
  • G140711A 06h24m35s - 07h27m05s: 1 feed
  • G140711B 07h28m32s - 08h31m07s: 3 feeds
  • 08/07/14 8 chicks, 4 feeds. Stereo audio
  • G140708A 05h47m56s - 06h50m26s: 2+1 feeds
  • G140708B 06h50m57s - 07h53m31s: 1 feed
  • 06/07/14 11 chicks, 9 feeds. Stereo audio
  • G140706A 05h44m56s - 06h47m26s: 6 feeds
  • G140706B 06h48m13s - 07h50m48s: 3 feeds
  • 04/07/14 12 chicks, 7 feeds. Stereo audio
  • G140704A 06h04m50s - 07h07m20s: 4 feeds
  • G140704B 07h08m02s - 08h10m37s: 3 feeds
  • 03/07/14 12 chicks, 7 feeds. Stereo audio
  • G140703A 05h57m49s - 07h00m19s: 3 feeds
  • G140703B 07h00m53s - 08h03m26s: 4 feeds
  • 02/07/14 11 chicks, 5 feeds. Stereo audio
  • G140702A 05h49m24s - 06h51m54s: 3 feeds
  • G140702B 06h52m27s - 07h54m59s: 2 feeds
  • 01/07/14 11 chicks, 7 feeds. Stereo audio
  • G140701A 05h43m17s - 06h45m47s: 5 feeds
  • G140701B 06h46m17s - 07h48m50s: 2 feeds
  • 30/06/14 11 chicks, 7 feeds. Stereo audio
  • G140630A 06h03m44s - 07h05m59s: 4+1 feeds
  • G140630B 07h07m22s - 08h09m54s: 2 feeds
  • 29/06/14 11 chicks, 2 feeds. Stereo audio
  • G140629A 06h50m32s - 07h53m07s: 2 feeds
  • G140629B 07h53m48s - 08h56m20s: no feeds
  • 21/06/14 10 chicks, 10 feeds. Stereo audio
  • G140621A 05h33m22s - 06h35m57s: 8+2 feeds
  • G140621B 06h36m28s - 07h39m00s: no feeds
  • 20/06/14 Summary 10 chicks, 7 feeds. Stereo audio
  • G140620A 06h20m56s - 07h23m30s: 5 feeds
  • G140620B 07h24m11s - 08h26m44s: 2 feeds
  • 18/06/14 At least 6 chicks, 6 feeds. Stereo audio
  • G140618A 06h24m27s - 07h27m02s: 2 feeds
  • G140618B 07h28m00s - 08h30m33s: 3+1 feeds
  • 16/06/14 First 3 chicks (one seen), first two feeds. Stereo audio
  • G140616A 06h09m24s - 07h09m24s: 1 feed
  • G140616B 07h09m24s - 08h12m29s: 1 feed
  • G140613A 06h45m57s - 07h48m31s from video
  • 11/06/14 Summary
  • G140611A 06h10m02s - 07h12m37s from video
  • G140611B 07h13m20s - 08h15m53s from video
  • 09/06/14 Summary
  • G140609A 06h12m54s - 07h15h29s from video
  • G140609B 07h16m26s - 08h18m58s from video
  • 08/06/14 Summary
  • G140608A 06h42 - 07h44 from video
  • G140608B 07h45 - 08h47m43s from video
  • 05/06/14 Summary
  • G140605A 06h04 - 06h39 from video
  • G140605B 06h41 - 07h44 from video
  • G140601T 06h41 - 07h42 from telescope
  • G140529T 07h00 - 08h00 from telescope
  • G140527T 06h40 - 08h40 from telescope
  • G140525T 07h50 - 09h15 from telescope
  • G140523T 08h25 - 08h30 from telescope

Other years


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