?
Paris
Aisne
N
0
60 km
Rouen
?
?
?
?
Second half of the 19 th century
Confirmed presence
?
Possible presence
To be confirmed
?
?
Situation around 1970
N
0
6 0 k m
?
Possible presence
To be confirmed
Fig. 3 Change in the distribution range of allis shad in the Seine River basin since the
mid-nineteenth century
308
J. Belliard et al.
Paris
Aisne
N
0
60 km
Rouen
?
?
?
?
Second half of the 19 th century
Confirmed presence
?
Possible presence
To be confirmed
?
?
Situation around 1970
N
0
6 0 k m
?
Possible presence
To be confirmed
Fig. 3 Change in the distribution range of allis shad in the Seine River basin since the
mid-nineteenth century
308
J. Belliard et al.