05 06 07 08 OQ 10 II 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 



. -i — I — I — i — I — I — I — \ — I — \ — I — I — I — I — I — I — I — I — I — \ — I — I — I — I — I — I — I — I — I — I I 1 r~i I I I I 11 I r 

 0506 07 08 0910 II 12 13 14 15 lb 17 18 19 20 2122 23 24 25 26 27 28 29 303132 33 3435 36 37 38 39 40 4142 43 44 45 46 47 



Fig. 17 

 The populations (occupied nests) of the Sandwich tern colonies of the German 

 North Sea coast (and Jordsand in Denmark) . Data mostly from H. Schulz 

 (1947), for years 1905-47. Dark shading: population. Light shading: station 



occupied but population not recorded. 



