. 2024 Feb 28;14:4884. doi: 10.1038/s41598-024-55501-y

Table 2.

Parameters of spring and autumn migratory journeys of adult grey plovers wintering in Guinea-Bissau, Portugal and France, as well as 2nd calendar year individuals (non-breeders) wintering in Guinea-Bissau.

	Guinea-Bissau	Portugal	France	Guinea-Bissau (2nd calendar year)
Departure date	129 ± 3.2 (9 May) [127–133]	215 ± 15 (3 Aug) [202–236]	129 ± 3.2 (9 May) [127–133]	222 ± 1.2 (10 Aug) [220–223]	125 ± 21.3 (5 May) [94–140]	207 ± 3.8 (26 Jul) [204–212]	134 ± 5.7 (14 May) [127–140]	266 ± 30 (23 Sep) [244–300]
Arrival date	162 ± 9.3 (11 June) [149–176]	298 ± 33 (25 Oct) [251–325]	158 ± 5.5 (7 June) [152–163]	261 ± 4.9 (18 Sep) [257–264]	157 ± 2.1 (6 June) [155–159]	239 ± 10.7 (27 Aug) [229–254]	161 ± 5.9 (10 June) [155–169]	276 ± 42 (3 Oct) [248–324]
Mean number of stopovers	4.7 ± 1.2 [3–6]	4.8 ± 1.3 [3–6]	2.7 ± 1.5 [1–4]	3.5 ± 0.7 [3–4]	3.8 ± 1.0 [3–5]	3.3 ± 1.5 [2–5]	2.3 ± 0.5 [2–3]	0.7 ± 1.2 [0–2]
Mean stopover duration (days) (n = stopovers)	5.3 ± 3.4 [1.1–14.7] (n = 47)	15.8 ± 24.5 [1.1–95.8] (n = 19)	7.4 ± 7.4 [1.3–19.4] (n = 8)	9.7 ± 11.1 [1.6–24.1] (n = 6)	6.8 ± 12.4 [1.1–48.5] (n = 15)	8.0 ± 6.9 [1.5 – 19.5] (n = 13)	8.3 ± 4.9 [1.2–15] (n = 9)	8.0 ± 3.4 [5.6–11.9] (n = 3)
Mean number of stationary periods	2.0 ± 2.5 [0–8]	2.0 ± 2.4 [0–5]	0.3 ± 0.6 [0–1]	0	8.3 ± 3.7 [4–13]	3.5 ± 2.6 [1–7]	1.0 ± 0.8 [0–2]	1
Mean stationary duration (days)	0.6 ± 0.2 [0.2–1] (n = 20)	0.6 ± 0.2 [0.3–1] (n = 8)	0.6 (n = 1)	–	0.3 ± 0.2 [0.0–0.8] (n = 33)	0.4 ± 0.3 [0.1–1] (n = 14)	0.7 ± 0.2 [0.6–1] (n = 4)	0.3 (n = 1)
Total migration duration (days)	33.7 ± 5.9 [24.5–39]	83.1 ± 29.0 [45.5–116]	28.1 ± 2.8 [24.9–30.2]	34.4	32.4 ± 20.2 [18.8–62.2]	31.9 ± 7.4 [25–42.3]	23.9 ± 3.2 [20.3–26.8]	9.7 ± 10.0 [3.4–21.2]
Migration distance (km)	11,476 ± 431 [10907–12067]	11,013 ± 392 [10578- 11436]	8094 ± 922 [7419–9144]	7324 ± 614 [6889–7758]	6411 ± 306 [6198–6858]	6632 ± 589 [6099–7466]	7009 ± 124 [6894–7182]	7003 ± 206 [6698–7129]
Migration speed (km/day)	355 ± 68 [282–445]	148 ± 59 [97–233]	294 ± 27 [264–319]	200	242 ± 99 [110–338]	213 ± 36 [177–263]	294 ± 38 [257–330]	1148 ± 854 [328–2139]

Guinea-Bissau

Portugal

France

Guinea-Bissau (2nd calendar year)

Spring

Autumn

Spring

Autumn

Spring

Autumn

Spring

Autumn

Departure date

129 ± 3.2

(9 May)

[127–133]

215 ± 15

(3 Aug)

[202–236]

129 ± 3.2

(9 May)

[127–133]

222 ± 1.2

(10 Aug)

[220–223]

125 ± 21.3

(5 May)

[94–140]

207 ± 3.8

(26 Jul)

[204–212]

134 ± 5.7

(14 May)

[127–140]

266 ± 30

(23 Sep)

[244–300]

Arrival date

162 ± 9.3

(11 June)

[149–176]

298 ± 33

(25 Oct)

[251–325]

158 ± 5.5

(7 June)

[152–163]

261 ± 4.9

(18 Sep)

[257–264]

157 ± 2.1

(6 June)

[155–159]

239 ± 10.7

(27 Aug)

[229–254]

161 ± 5.9

(10 June)

[155–169]

276 ± 42

(3 Oct)

[248–324]

Mean number of stopovers

4.7 ± 1.2

[3–6]

4.8 ± 1.3

[3–6]

2.7 ± 1.5

[1–4]

3.5 ± 0.7

[3–4]

3.8 ± 1.0

[3–5]

3.3 ± 1.5

[2–5]

2.3 ± 0.5

[2–3]

0.7 ± 1.2

[0–2]

Mean stopover duration (days)

(n = stopovers)

5.3 ± 3.4

[1.1–14.7]

(n = 47)

15.8 ± 24.5

[1.1–95.8]

(n = 19)

7.4 ± 7.4

[1.3–19.4]

(n = 8)

9.7 ± 11.1

[1.6–24.1]

(n = 6)

6.8 ± 12.4

[1.1–48.5]

(n = 15)

8.0 ± 6.9

[1.5 – 19.5]

(n = 13)

8.3 ± 4.9

[1.2–15]

(n = 9)

8.0 ± 3.4

[5.6–11.9]

(n = 3)

Mean number of stationary periods

2.0 ± 2.5

[0–8]

2.0 ± 2.4

[0–5]

0.3 ± 0.6

[0–1]

8.3 ± 3.7

[4–13]

3.5 ± 2.6

[1–7]

1.0 ± 0.8

[0–2]

Mean stationary duration (days)

0.6 ± 0.2

[0.2–1]

(n = 20)

0.6 ± 0.2

[0.3–1]

(n = 8)

0.6

(n = 1)

–

0.3 ± 0.2

[0.0–0.8]

(n = 33)

0.4 ± 0.3

[0.1–1]

(n = 14)

0.7 ± 0.2

[0.6–1]

(n = 4)

0.3

(n = 1)

Total migration duration (days)

33.7 ± 5.9

[24.5–39]

83.1 ± 29.0

[45.5–116]

28.1 ± 2.8

[24.9–30.2]

34.4

32.4 ± 20.2

[18.8–62.2]

31.9 ± 7.4

[25–42.3]

23.9 ± 3.2

[20.3–26.8]

9.7 ± 10.0

[3.4–21.2]

Migration distance (km)

11,476 ± 431

[10907–12067]

11,013 ± 392

[10578- 11436]

8094 ± 922

[7419–9144]

7324 ± 614

[6889–7758]

6411 ± 306

[6198–6858]

6632 ± 589

[6099–7466]

7009 ± 124

[6894–7182]

7003 ± 206

[6698–7129]

Migration speed (km/day)

355 ± 68

[282–445]

148 ± 59

[97–233]

294 ± 27

[264–319]

200

242 ± 99

[110–338]

213 ± 36

[177–263]

294 ± 38

[257–330]

1148 ± 854

[328–2139]

Mean ± SD are presented in bold and range in square brackets. Sample size (n) for stopover (i.e., stops > 24h) and stationary (i.e., stops < 24h) duration is also given in parenthesis. Departure and arrival dates refer to the first and last days of migration and are expressed as the number of days elapsed since the 1st of January. Only complete migrations were considered (see sample size in Table 1).