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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.
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