At Belle Island the amounts of radioactivity in specimens of algae
from different areas of the intertidal zone (Fig. 4) collected on the
same day were compared.
Table 4.
An example is presented in Table 4.
Gross beta activity of four species of algae collected
from different areas of Belle Island on May 22, 1954.
Values are expressed as thousands of d/m./g of wet
tissue at time of collection.
Species
Area
E-1
E-2
F-1
F-2
G
Halimeda opuntia
478
375
633
674
621
Caulerpa urvilliana
735
-
704
455
503
Udotea indica
-
2040
1320
1170
2060
Microdictyon sp.
-
361
208
285
593
This table and similar data from other collection dates showed
that the radioactivity of the algae from different areas was essentially
the same.
The variability in the radioactivity of five to ten specimens of
Halimeda sp. from the same area was also determined for eighteen
collections.
The coefficient of variation, C (C = standard deviation ~
mean), varied from 12 to 65 per cent, the average being 35 per cent,
an indication of great variability in the amounts of radioactivity in the
samples collected from the same area.
Similar conclusions were reached