Table 2 Site fidelity during the migration period in the Yellow Sea for Bar-tailed Godwits Limosa lapponica and Great Knots Calidris tenuirostris, as measured from satellite tracking data and resighting data

Satellite tracking data

Median number of sites used per individual:

 Northward

2 (range: 1–3)

3 (range: 1–4)

 Southward

2 (range: 1–3)

2.5 (range: 1–4)

Percentage of individuals visiting the same sites during northward and southward migration

80% (n = 20)

67% (n = 12)

p = 0.43

Percentage of time spent in the repeatedly visited sites (of total staging duration in southward migration)

Median = 92%

Median = 19%

p = 0.01*

Resighting data

Percentage of individuals resighted at n Yellow Sea site(s) within a northward migration

 1 site

99.2% (132 birds)

97.7% (333 birds)

p = 0.45

 2 sites

0.8% (1 bird)

2.1% (7 birds)

 3 sites

0

0.3% (1 bird)

Percentage of individuals resighted at the same Yellow Sea site during both northward and southward migration

90.9% (n = 11)

63.6% (n = 11)

p = 0.31

Percentage of individuals resighted at the same Yellow Sea site in >  = 2 northward migrations

98.0% (n = 102)

89.5% (n = 267)

p = 0.005*