Phytoplankton of the seasonal surveys of 1977, and further pre- vs. post-operational comparisons at Cook Nuclear Plant / John C. Ayers, Susan J. Wiley.

observations have been computed and are given in Table 4.

TABLE 4. Means, standard errors, and numbers of observations of phytoplankton
forms by seasons, depth zones, and inner and outer station groups in Cook Plant
seasonal surveys 1977. Previous years are reported by Ayers, Southwick, and
Robinson (1977) and Ayers (1978).
1977
14 April 1l July 14 October
Zone 0, Inner
Mean 57.17 57.33 66.50
S. E. 2.74 4.86 3.91
N 12 12 12
Outer
Mean 51.60 54.00 63.10
S. E. 1.63 6.78 4.84
N 10 9 10
Zone 1, Inner
Mean 57.67 42.67 68.00
S. E. 9.17 5.33 6.43
N 3 3 3
Outer
Mean 54.00 48.25 71.25
S. E. 6.37 3.04 9.76
N 4 4 4
Zone 2, Inner
Mean 61.00 42.00 61.50
S. E. 4.00 2.00 0.50
N 2 2 2
Outer
Mean 46.75 40.50 45.50
S. E. 5.44 1.33 2.85
N 44 4
Time plots of mean numbers of forms by seasons, depth zones, and inner and
outer station groups are presented in Figure 5. Also included in the figure
are, for each year, three-seasonal averages of mean numbers of forms at inner
and outer stations; these are plotted in July of each year and are connected

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