nd
Assuming, as these results indicate, that activities in
coarse and fine meshes do not differ, the ratio of coarse to
fine should be unity. The ratios in Table 9 were used to
determine variability on the wet as opposed to the ash basis.
On the ash basis, variance was only half as great as on the
wet basis,
thus, ash is considered the better basis.
Con-
version to logarithms was necessary to normalize the skewed
(with peak toward the left) frequency distribution of the two
arrays of ratios.
Figure 12 shows
90, 0001"
the decline for
MIKE CRATER
plankton samples at
6 localities on a
wet weight basis
using the data of
Table 7, with the
two values for paired
tows averaged.
Except at the
Mike crater and Vera
the declines were
steep, ranging from
average for all locali-
ties combined of -1.96,
wet basis, and -1.74 on
the ash basis.
The
WIDE PASSAGE
d/m/g x 103 wet
-1.8 to -2.61 as seen
from Table 1, with an
10,000
1000,-
gradual decline (-1.0)
at the Mike crater could
be the result of continu-
ous leaching of radioiso-
topes, from the crater
into the water, thereby
maintaining the activity
of the plankton.
At
Vera the trend is too
F
O.IF
100
1.
1000 10
—L.
too
DAYS AFTER MAY /4,1954
poorly defined (P > 10%)
to permit comparisons.
Fig. 12
1000 10
1
100
*
i000