Table 1 Flight details of Cory’s shearwater fledglings grounded by artificial lights on Tenerife, Canary Islands.

From: GPS tracking for mapping seabird mortality induced by light pollution

Variables

First flights

Second flights

P-value

 

Mean ± SD

range

Mean ± SD

range

 

Timing (min)

224.52 ± 192.32

100.20–560.90

136.86 ± 137.28

34.20–479.60

0.297

Duration (min)

8.78 ± 4.66

3.20–16.10

93.50 ± 110.65

8.90–340.83

0.071

Length (m)

6325.8 ± 3054.2

2337–10296

26151.5 ± 24625.2

4195–93044

0.074

Straight length (m)

4092.2 ± 2943.6

706–9038

5717.6 ± 4921.3

1690–15597

0.307

Tortuosity

0.226 ± 0.200

0.064–0.554

0.664 ± 0.229

0.184–0.959

0.002**

Speeda (km/h)

44.79 ± 12.55

35.59–66.60

29.61 ± 4.93

19.02–37.85

<0.001***

Light pollution levels

 max. level

31.79 ± 18.96

6.13–51.33

41.43 ± 32.34

18.93–103.64

0.542

 mean level

14.68 ± 8.75

2.18–26.19

18.71 ± 9.52

10.01–44.67

0.444

colony/grounding place ratio

0.241 ± 0.359

0.011–1.313

0.037 ± 0.012

0.012–0.049

<0.001***

  1. Variables in bold were calculated from information provided by GPS data loggers (sample sizes: n = 5 for first flights, n = 13 for second flights). The sample size for the remainder variables is 12 and 20 for first and second flights, respectively (total sample equals 32). *** and ** indicate P-values <0.001 and <0.01, respectively. a until birds rest on the sea surface.
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