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Feeding ecology of Common Guillemots on Lundy: parental attendance
Feeding ecology of Common Guillemots on Lundy
Summary

Parental attendance is the amount of time spent by both adults on the breeding ledge. There is at least one adult with the chick in normal conditions. In this study, parental attendance is time that both adults are present within the two linked 60 minute observation sessions. It is measured from the second that the arriving bird lands on the ledge, to the second that the departing bird leaves the ledge. It can be expressed either as a time in minutes and seconds, or as a percentage of that time within the 120 minute observing session.

Time when neither adult is at the ledge is expressed as a negative time.

Departure is usually intentional, the departing bird may look towards the sea several times before leaving, interspersed with interactions with its partner. It is not known if communication with the chick influences the adult's decision to leave the nest.

Sometimes departure is unintentional, either the result of an accidental fall, or the result of the fight between two adults. It is assumed that a departure is unintentional if the adult returns to the ledge without a fish within 5 minutes. In this study, the shortest time that an adult returned with a fish was 6m25s. If an adult falls from the ledge but takes longer to return it



min	  2012	  2013	  2014	  2015

-55	  1.01%	  0.00%	  0.00%	  0.00%
-25	  2.02%	  0.00%	  0.00%	  0.00%
  5	 64.65%	 53.78%	 45.13%	 59.09%
 15	 79.80%	 70.59%	 56.64%	 74.55%
 25	 86.87%	 80.67%	 69.03%	 86.36%
 35	 88.89%	 84.87%	 76.11%	 89.09%
 45	 92.93%	 88.24%	 84.07%	 91.82%
 55	 94.95%	 89.92%	 86.73%	 93.64%
 65	 95.96%	 91.60%	 91.15%	 95.45%
 75	 96.97%	 94.12%	 92.92%	 97.27%
 85	 98.99%	 95.80%	 95.58%	 98.18%
 95	 98.99%	 96.64%	 97.35%	 99.09%
105	100.00%	 98.32%	100.00%	 99.09%
115	100.00%	100.00%	100.00%	100.00%

N = 	  99	 119	 113	 110


min	1213	12-14	12-15	13-14	13-15	15-14

-55	 1.0%	 1.0%	 1.0%	 0.0%	 0.0%	 0.0%
-25	 2.0%	 2.0%	 2.0%	 0.0%	 0.0%	 0.0%
  5	10.9%	19.5%	 5.6%	 8.6%	-5.3%	14.0%
 15	 9.2%	23.2%	 5.3%	14.0%	-4.0%	17.9%
 25	 6.2%	17.8%	 0.5%	11.6%	-5.7%	17.3%
 35	 4.0%	12.8%	-0.2%	 8.8%	-4.2%	13.0%
 45	 4.7%	 8.9%	 1.1%	 4.2%	-3.6%	 7.7%
 55	 5.0%	 8.2%	 1.3%	 3.2%	-3.7%	 6.9%
 65	 4.4%	 4.8%	 0.5%	 0.4%	-3.9%	 4.3%
 75	 2.9%	 4.0%	-0.3%	 1.2%	-3.2%	 4.4%
 85	 3.2%	 3.4%	 0.8%	 0.2%	-2.4%	 2.6%
 95	 2.4%	 1.6%	-0.1%	-0.7%	-2.5%	 1.7%
105	 1.7%	 0.0%	 0.9%	-1.7%	-0.8%	-0.9%
115	 0.0%	 0.0%	 0.0%	 0.0%	 0.0%	 0.0%

N* = 	54.04	52.77	52.11	57.96	57.16	55.74




 2016          Chick-hours	Both adults     Both adults
                                at nest (time)  at nest (%)

17/06/16	18:00:00	02:52:27	15.97%
19/06/16	20:00:00	03:32:51	17.74%
22/06/16	20:00:00	03:30:32	17.54%
24/06/16	20:00:00	00:45:50	 3.82%
26/06/16	18:00:00	00:46:01	 4.26%
27/06/16	18:00:00	00:55:13	 5.11%
28/06/16	18:00:00	02:16:57	12.68%
30/06/16	18:00:00	04:18:56	23.98%
01/07/16	18:00:00	02:00:34	11.16%
02/07/16	18:00:00	03:04:15	17.06%
03/07/16	18:00:00	04:34:59	25.46%

2016	       204:00:00	28:38:35	14.04%



 2015          Chick-hours	Both adults     Both adults
                                at nest (time)  at nest (%)

15/06/15	 24:00:00	04:34:15	19.05%
18/06/15	 24:00:00	02:28:14	10.29%
21/06/15	 24:00:00	01:28:44	 6.16%
23/06/15	 24:00:00	03:22:46	14.08%
24/06/15	 24:00:00	03:08:57	13.12%
25/06/15	 24:00:00	03:55:42	16.37%
27/06/15	 24:00:00	03:14:39	13.52%
29/06/15	 26:00:00	03:30:53	13.52%
02/07/15	 26:00:00	01:17:50	 4.99%
			
                220:00:00	27:02:00	12.29%



 2014          Chick-hours	Both adults     Both adults
                                at nest (time)  at nest (%)
18/06/14	12:00:00	03:31:45	29.41%
20/06/14	20:00:00	05:11:05	25.92%
21/06/14	20:00:00	06:01:54	30.16%
29/06/14	22:00:00	01:45:55	 8.02%
30/06/14	22:00:00	02:21:58	10.76%
01/07/14	22:00:00	03:11:38	14.52%
02/07/14	22:00:00	03:14:34	14.74%
03/07/14	24:00:00	06:25:09	26.75%
04/07/14	24:00:00	04:27:26	18.57%
06/07/14	22:00:00	05:46:08	26.22%
08/07/14	16:00:00	03:06:39	19.44%
			
               226:00:00	45:04:11	19.94%



 2013          Chick-hours	Both adults     Both adults
                                at nest (time)  at nest (%)
19/06/13	12:00:00	03:22:18	28.10%
20/06/13	12:00:00	01:51:43	15.52%
24/06/13	16:00:00	01:39:52	10.40%
25/06/13	16:00:00	00:45:13	 4.71%
26/06/13	16:00:00	01:27:46	 9.14%
27/06/13	16:00:00	01:25:42	 8.93%
28/06/13	16:00:00	01:19:50	 8.32%
02/07/13	18:00:00	02:48:28	15.60%
03/07/13	18:00:00	01:48:08	10.01%
05/07/13	18:00:00	01:31:40	 8.49%
06/07/13	16:00:00	04:26:15	27.73%
07/07/13	14:00:00	00:34:52	 4.15%
08/07/13	14:00:00	07:01:28	50.17%
09/07/13	14:00:00	03:18:38	23.65%
10/07/13	12:00:00	00:30:38	 4.25%
11/07/13	10:00:00	02:16:04	22.68%
			
               238:00:00	36:08:35	15.19%



 2012          Chick-hours	Both adults     Both adults
                                at nest (time)  at nest (%)
11/06/12	08:00:00	00:53:14	11.09%
13/06/12	20:00:00	02:35:20	12.94%
17/06/12	22:00:00	05:19:06	24.17%
18/06/12	22:00:00	02:18:30	10.49%
20/06/12	22:00:00	02:25:51	11.05%
27/06/12	18:00:00	00:22:37	 2.09%
28/06/12	18:00:00       -00:04:17        -0.40%
29/06/12	18:00:00	00:22:00	 2.04%
30/06/12	18:00:00	03:41:04	20.47%
01/07/12	18:00:00	01:47:48	 9.98%
02/07/12	14:00:00       -00:22:41        -2.70%

               198:00:00	19:18:32	 9.75%


Articles on the parental attendance of Lundy's Common Guillemots


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