Maternal Output in Polar Fish Reproduction
47
:?
10 8
10 8
'"
Pelagic
Demersal
II: 10 7
--10 7
""
• -
Q,I
10 6
10 6
0
c..
-
-- - -
0
0
'"
0
-
OJ) 10 5 ~~
10 5
OJ)
0
0
Q,I
00
8
..
0 10 4
10 4 80 00
-
=
0
'-'
0
~
-
.0 10 3
10 3
-
;.s
= 10 2
I_ Boreal I 10 2
l- Boreal I
=
Col
o Polar
0
o Polar
Q,I
10'
10 '
r..
0
500
1000
1500 2000
0
500
1000
1500
2000
Body length (mm)
Body length (mm)
Fig. 2. Scatter plots showing fecundities and body lengths of boreal and polar fish species
with pelagic and demersal spawning modes. Note the logarithmic scale for fecundity
Maternal Output
Maternal output, i.e. the product of individual egg volume and fecundity,
increases with body length irrespective of zoogeography and mode of
oviposition (Fig. 3; Table 2). Moreover, there are no zoogeographic
differences in maternal output within modes of oviposition.
,-, 10 8
10 8
.c:
o Pelagic
Demersal
0
'"
II: 10 7
•
0
~
10 7
""
-
Q,I
c.. 10 6
- •
~
-
10 6
8
0
o-e..
000_
! 10 5 ~cf
10 5
0
t -
....
= 10 4
10 4
c..
....
~~
= 10 3
10 3
0
-;
-
= 10 2
I_ Boreal I 10 2 0
I_ Boreal I
"" Q,I
o Polar
o Polar
....
~
10 '
10 '
~
0
500
1000
1500
2000
0
500
1000
1500
2000
Body length (mm)
Body length (mm)
Fig. 3. Scatter plots showing maternal outputs and body lengths of boreal and polar fish
species with pelagic and demersal spawning modes. Maternal output is defined as the
product of individual egg volume and number of eggs. Note the logarithmic scale for
maternal output