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210 T. KRÜGER & S. GARTHE Atlantic <strong>Seabird</strong>s 3(4)<br />
Fli ght alti tude<br />
Fli ght alti tude<br />
very high<br />
high<br />
medium<br />
low<br />
very high<br />
Red-throated Diver (n = 247)<br />
high<br />
medium<br />
low<br />
very high<br />
medium<br />
Eider (n = 14,405)<br />
Common Scoter (n = 6,754) Shelduck (n = 1,013)<br />
high<br />
-100 -50 0 50 100<br />
low<br />
Number of birds [%]<br />
-100 -50 0 50 100<br />
Number of birds [%]<br />
-100 -50 0 50 100<br />
Number of birds [%]<br />
headwind<br />
tail wind<br />
headwind<br />
tail wind<br />
headwind<br />
tail wind<br />
very high<br />
medium<br />
very high<br />
medium<br />
-100 -50 0 50 100<br />
Sandwich Tern (n = 959) Common/Arctic Tern (n = 271)<br />
Flight altitude<br />
Fl ight al titude<br />
very high<br />
high<br />
medium<br />
low<br />
high<br />
-100 -50 0 50 100<br />
low<br />
high<br />
low<br />
Number of birds [%]<br />
-100 -50 0 50 100<br />
Number of birds [%]<br />
Number of birds [%]<br />
headwind<br />
tail wind<br />
headwind<br />
tail wind<br />
headwind<br />
tail wind<br />
Figure 3. Relative frequency of westward moving coastal birds, grouped according to<br />
flight altitude and wind direction.<br />
Figuur 3. Relatieve verdeling van westwaarts vliegende kustvogels, gegroepeerd naar<br />
vlieghoogte en windrichting.
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