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

Su, Fa), and I or 0 indicating which station group had the greater mean

density of cells. Cases
Coccoid blue-greens
Filamentous blue-greens
Coccoid greens
Filamentous greens
Flagellates
Centric diatoms
Pennate diatoms
Desmids
Other algae
Total algae

in operational years are underlined.

75.Z2. Fa.
75. Z1.Su, q
70,Z2,Su,I
71,Z1,Su,O
76,Z2.,Fa,
72,Z1,Sp,0
70,Z1,Su,O
71,Z1,Su,0
71,Z1,Sp,O
74,Z2,Sp,I
72,ZO,Sp,0

75. Z2..Fa.
71,Z2,Su,I
72,Z2,Sp,C
77.Z__.Su.C
72,Z2,Fa,I
71,Z2,Su,C
71,Z2,Su,I
73,ZO,Sp,]
77.Z2.Fa,
72,Z2,Sp,C

L 76.2.Su,
76.Z2.Fa.I
None
)73,Z1,Fa,O
77 Z1..a.
_75,Z1.Fa.I
73,Z1,Sp,0
73,Z1,Sp,I

772. Za.,Su..
77.Z2.Su.I
74,Z2,Fa,0
75.Z2,Fa.I
75.Z2.Fa.I
73,Z2,Fa,I

)

76. Z1.SD.O

Summarized by years the cases of significant difference were:
1970 (2 seasons) 2 cases 1974 2 cases
1971 6 1975 _
1972 5 1976 4
1973 5 1977 _
It is noted that the six cases of difference in operational 1975 and 1977 are
not greater than the six that occurred in preoperational 1971; it is also
noted that the four in operational 1976 are less than the five that occurred
in preoperational 1972 and 1973. The numbers of cases by years appears to
be within the natural range of variation, and no effect of plant operation
is evident.
Summarized by depth zones, with the station group having the greatest
density of algae indicated and with operational year cases underlined, the
cases of significant difference were:

70