11. ECOLOGY OF DISTRIBUTION
331
O O
Ir)
OO
0
0
n
0
0
u)
0
0
(31
0
0
0
0
W
Is
I
I
I
1
I
I
3
0
rn
0
0
0
2
0
C
u1
0
C
80'
70
60
goo
6 Oo
30"
0"
30°
c Y
--.\ I
800
70°
60°
90'
60'
3 0 '
3 0 '
FIG. 122. Illustration of the possible methods of populating northern areas by dispersion of larvae from the breeding centres of Meganyctiphanea norwegica (broken lines and arrows) ; superimposed are breeding centres of Thysanoessa inermis (crosses), T . Zongicaudata
(vertical hatching), and Euphausia krohnii (horizontal hatching). (Data on Meganyctiphanes norwegica from Einarsson, 1945.)
331
O O
Ir)
OO
0
0
n
0
0
u)
0
0
(31
0
0
0
0
W
Is
I
I
I
1
I
I
3
0
rn
0
0
0
2
0
C
u1
0
C
80'
70
60
goo
6 Oo
30"
0"
30°
c Y
--.\ I
800
70°
60°
90'
60'
3 0 '
3 0 '
FIG. 122. Illustration of the possible methods of populating northern areas by dispersion of larvae from the breeding centres of Meganyctiphanea norwegica (broken lines and arrows) ; superimposed are breeding centres of Thysanoessa inermis (crosses), T . Zongicaudata
(vertical hatching), and Euphausia krohnii (horizontal hatching). (Data on Meganyctiphanes norwegica from Einarsson, 1945.)