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Table 1 Radio tracking details of northern wheatears in Wales (AK) in autumn 2010

From: Stopover optimization in a long-distance migrant: the role of fuel load and nocturnal take-off time in Alaskan northern wheatears (Oenanthe oenanthe)

Ind. [ring number] Date of capture Night of departure Departure time [min after local sunset] Sun elevation at departure [°] Departure direction [°] Tracking information
179106207 11.8. - - - - - loss of signal during the night on 12./13.8.
- tracked until 40 min after sunset*
179106208 11.8. 18/19.8. 83 -6.68 219  
179106210 12.8. 18/19.8. 103 -7.87 194  
179106211 12.8. 12/13.8. 85 -6.17 201  
179106212 12.8. 17/18.8. 114 -8.33 204  
179106214 12.8. 17/18.8. 124 -8.80 209  
179106215 13.8. - - - - - loss of signal during the night on 13./14.8.
- tracked until 305 min after sunset*
179106224 14.8. 18/19.8. 68 -5.70 239  
179106229 14.8. - - - - - loss of signal during the night on 20./21.8.
- tracked until 165 min after sunset*
179106236 14.8. - - - - - no tracking during the night of 14./15.8. due to strong gale and rain - likely disappeared during the day of 14.8. (transient)
179106242 15.8. 18/19.8. 128 -9.14 219  
179106257 19.8. - - - - - loss of signal during the night on 19./20.8.
- tracked until 220 min after sunset*
179106259 19.8. - - - - - disappeared during the day
- tracked until the morning of 20.8., but not relocated during the day
179106261 20.8. 20/21.8. 76 -6.37 219  
179106262 20.8. 26/27.8. 95 -8.11 277  
179106263 21.8. - - - - - loss of signal during the night on 21./22.8.
- tracked until 270 min after sunset*
179106264 21.8. 26/27.8. 55 -5.49 264  
179106265 22.8. 26/27.8. 99 -8.47 274  
179106266 22.8. 25/26.8. 29 -3.47 - - departure direction could not be determined
179106271 22.8. - - - - - disappeared during the night on 22./23.8.
- tracked until 195 min after sunset*
179106275 22.8. - - - - - disappeared during the night on 22./23.8.
- tracked until 165 min after sunset*
179106276 22.8. 26/27.8. 48 -4.92 269  
179106277 23.8. 26/27.8. 114 -9.45 274  
179106286 26.8. - - - - - disappeared during the day (transient)
- not relocated on the evening of 26.8.
179106297 29.8. - - - - - disappeared during the day (transient)
- not relocated on the evening of 29.8.
179106298 29.8. 29/30.8. 87 -7.90 204  
179106299 29.8. - - - - - disappeared during the day (transient)
- not relocated on the evening of 29.8.
181108935 29.8. 29/30.8. 54 -5.60 234  
181108944 31.8. - - - - - disappeared during the day (transient)
- not relocated on the evening of 31.8.
181108945 31.8. - - - - - disappeared during the day (transient)
       - not relocated on the evening of 31.8.
  1. Departure time was defined as time when birds actually set off from the ground, as signal strength increases dramatically due to good reception of the signal. Departure direction was corrected for local declination (+11.19°, see Methods section). If departure could not be tracked, circumstances of last tracking are given. Even after loss of signal birds’ specific frequencies were checked throughout the night to detect whether birds reappeared or departed. Birds leaving the study area before the evening of their day of capture were transients. * = Bird rested in stony mountain. Signal vanished without prior increase in signal strength.