Annex
Wetland birds counted in the study area (Sado Estuary, Portugal) between December 2012 and October 2015. For each species we
present the number of birds counted per season, in 11 sectors close to (<500 m) and 11 sectors far from (>500 m) a railway line. We
also present the proportion of birds counted in each of the three main habitats represented in the study area: rice
fields (rice), intertidal
mudflats (intertidal) and salt pans (tanks).
Species
Winter
Autumn
Spring
Summer
Total Habitat
<500 m >500 m <500 m >500 m <500 m >500 m <500 m >500 m
Rice
(%)
Intertidal
(%)
Tank
(%)
Common
shelduck
Tadorna tadorna
65
20
20
7
15
127
7
93
Ruddy shelduck
Tadorna
ferruginea
2
2
100
Mallard
Anas
platyrhynchos
142
6
6
27
37
54
6
278
9
67
24
Gadwall
Anas strepera
2
2
100
Northern shoveler Anas clypeata
490
585
1289
747
166
3277
4
96
Eurasian teal
Anas crecca
1
1
100
Black-necked
grebe
Podiceps
nigricollis
105
29
20
45
1
200
3
97
Little grebe
Tachybaptus
ruficollis
61
94
9
39
7
2
212
1
99
Great cormorant
Phalacrocorax
carbo
19
528
148
2
62
759
3
97
Western cattle
egret
Bubulcus ibis
7
14
13
61
10
3
60
320
488
93
1
6
Little egret
Egretta garzetta
38
50
96
254
25
51
103
167
784
64
11
25
(continued)
11 Assessing Bird Exclusion Effects in a Wetland Crossed …
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