Variability among autumn migration patterns of Mongolian Common Shelducks (Tadorna tadorna)

Table 1 Bird information, individual and summarized autumn migration parameters of tracked Common Shelducks (Tadorna tadorna) based on tracking data retrieved on 16 March 2018

Logger	Captured date	Age	Sex	Body mass on capture (g)	Duration of tracking (days)	Start of migration	End of migration	Migration duration (days)	Migration distance (km)	Straightness index	No. stopovers	Stopover duration (days)	Mean ± SD duration of stopovers (days)	Migration speed (km/day)
2252^a	7/25/2017	2cy	Male	980	203	8/24/2017	12/6/2017	103.5	1526.5	0.9	2	90.3	45.13 ± 22.92	14.7
2247	7/26/2017	Adult	Male	1140	234	9/28/2017	9/29/2017	1.5	1070.2	1.0	0	0.0	0	734.0
2229	7/26/2017	Adult	Male	1240	233	9/10/2017	1/5/2018	116.8	1908.6	0.6	5	111.7	22.35 ± 20.99	16.3
2226^a	7/26/2017	Adult	Male	1100	186	8/25/2017	11/14/2017	80.9	1189.7	0.9	1	71.7	71.75	14.7
2224	7/26/2017	Adult	Male	960	223	8/24/2017	12/13/2017	110.6	2092.1	0.7	5	104.1	20.82 ± 13.46	18.9
2220	7/25/2017	Adult	Female	710	190	8/12/2017	1/11/2018	151.8	2114.0	0.9	5	148.1	29.62 ± 24.62	13.9
2217^a	7/26/2017	Adult	Male	1100	210	9/10/2017	11/20/2017	70.9	1320.9	1.0	1	60.3	60.29	18.6
2207^a	7/25/2017	2cy	Male	1030	208	9/16/2017	12/22/2017	97.0	2018.0	0.7	2	65.5	32.77 ± 10.75	20.8
2173^a	7/25/2017	Adult	Female	960	235	9/10/2017	12/11/2017	92.1	2396.4	1.0	2	77.3	38.65 ± 50.41	26.0
2155	7/25/2017	Adult	Female	1000	217	9/10/2017	12/11/2017	92.3	1492.8	0.9	2	89.9	44.96 ± 53.09	16.2
Mean				1022	213.9	9/5/2017	12/6/2017	91.7	1712.9	0.9	2.5	81.9	32.8	89.4
Standard deviation				134.5	17.7	13.5 days	29.6 days	38.7	450.5	0.1	1.8	38.7	25.1	226.5

“2cy” denotes the second-year bird
^amigration tracks containing data gaps, see the section “Methods” for more details

ISSN: 2053-7166