Table 3 Summary of Barrow’s goldeneye arrival, departure, and length of stay between stages
From: Dispersal of juvenile Barrow’s goldeneyes (Bucephala islandica) mirrors that of breeding adults
Variable | Juvenile males | Juvenile females | Adult males | Adult females | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Median | 1st/3rd quartile | Range | Number of birds | Median | 1st/3rd quartile | Range | Number of Birds | Median | 1st/3rd quartile | Range | Number of birds | Median | 1st/3rd quartile | Range | Number of BIRDS | ||
Hatch or Breed | Depart | Sep 23 | Sep 06/Oct 11 | Aug 13–Nov 01 | 26 | Oct 06 | Sep 12/Oct 24 | Aug 18–Nov 01 | 16 | Jun 12 | Jun 06/Jun 17 | May 22–Jul 02 | 39 | Aug 08 | Aug 01/Aug 10 | Jul 29–Aug 15 | 9 |
Moult | Arrive | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | Jul 01 | Jun 18/10-Jul | Jun 08–Aug 01 | 39 | Aug 09 | Aug 05/Aug 12 | Aug 01–Aug 16 | 9 |
Depart | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | Oct 03 | Sep 24/ Oct 13 | Aug 29–Aug 01 | 25 | Oct 06 | Oct 01/Oct 14 | Sep 20–Oct 28 | 8 | |
LOS (days) | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | 92 | 75/113 | 55–154 | 25 | 61 | 57/66 | 51–74 | 8 | |
Winter | Arrive | Nov 2 | Oct 25/ Nov 05 | Oct 01–Nov 23 | 21 | Nov 01 | Oct 29/Nov 03 | Oct 24–Nov 07 | 11 | Nov 01 | Oct 28/Nov 05 | Oct 12–Nov 10 | 20 | Nov 03 | Oct 29/Nov 07 | Oct 25–Nov 14 | 8 |
Depart | May 10 | May 05/May 13 | Apr 12–May 14 | 7 | May 11 | May 06/May 21 | Apr 30–Jun 07 | 4 | Apr 18 | Apr 10/Apr 22 | Mar 24–May 03 | 11 | Apr 13 | Apr 07/Apr 15 | Mar 24–Apr 21 | 7 | |
LOS (days) | 171 | 168/178 | 168–205 | 7 | 176 | 164/182 | 141–186 | 4 | 199 | 192/204 | 186–215 | 11 | 205 | 196/212 | 192–236 | 7 | |
Breed | Arrive | May 14 | May 11/May 24 | May 07–May 25 | 5 | May 27 | May 09/Jun 14 | May 07–Jun 14 | 4 | Apr 30 | Apr 19/May 08 | Apr 11–Jun 12 | 9 | Apr 17 | Apr 15/Apr 18 | Apr 09–Apr 22 | 6 |
Depart | Jun 20 | Jun 16/22-Jun | Jun 05–Jun 24 | 4 | Jul 17 | Jul 04/Aug 19 | Jun 21–Sep 22 | 3 | May 29 | May 25/Jun 08 | May 23–Jun 11 | 9 | Jul 14 | Jul 13/Jul 25 | Jul 10–Aug 17 | 6 | |
LOS (days) | 36 | 29/42 | 23–47 | 4 | 44 | 39/73 | 34–101 | 3 | 43 | 30/59 | 14–64 | 9 | 113 | 112/116 | 104–119 | 6 | |
Moult | Arrive | Jul 17 | Jul 04/Aug 21 | Jun 11–Sep 23 | 4 | Jul 18 | Jul 05/Aug 21 | Jun 22–Sep 23 | 3 | Jun 23 | Jun 08/Jul 12 | May 25–Jul 17 | 9 | Jul 25 | Jul 16/Aug 09 | Jul 11–Aug 23 | 6 |
Depart | Oct 24 | Oct 07/Oct 26 | Oct 03–Oct 27 | 3 | Oct 12 | Sep 28/Oct 27 | Sep 13–Nov 11 | 2 | Oct 03 | Sep 08/Oct 07 | Jun 05–Oct 17 | 9 | Oct 03 | Sep 28/Oct 05 | Sep 28–Oct 13 | 5 | |
LOS (days) | 81 | 58/104 | 34–127 | 3 | 67 | 59/76 | 50–84 | 2 | 99 | 54/119 | 32–139 | 9 | 67 | 62/70 | 44–80 | 5 | |