The phytoplankton of the Cook Plant monthly minimal surveys during the preoperational years 1972, 1973, and 1974 / by John C. Ayers.

TABLE 3 continued.

Station Number of Mean number of Standard Student's
Month group observations cells per ml error t
1974
Apr I 3 1,440 279
0 5 1,399 349 0.08 n.s.l
May I 4 2,069 823
0 5 608 86 2.00 n.s.
Jun I 4 1,763 856
0 5 862 107 1.18 n.s.
Jul I 4 1,664 212
0 5 1,192 373 1.02 n.s.
Aug I 4 1,500 260
0 5 1,015 118 1.83 n.s.
Sep I 3 1,292 249
0 5 786 188 1.63 n.s.
Oct I 4 1,791 177
0 5 1,602 87 1.02 n.s.

n.s.: not significant (p >.05). The null hypothesis was
means in the inshore and offshore regions were equal.

that the population

this connection it is noted that the numbers of unidentified "sp."
categories decreased from 48 in 1973 to 38 in 1974.

and "spp."

NUMBERS OF PHYTOPLANKTON FORMS, 1972 THROUGH 1974
Table 4 gives by station and month the total numbers of cells per ml, the
total numbers of forms recognized, and the mean numbers of cells per form in
the short survey collections at Cook Plant during 1974. Similar tables for
the collections of 1972 and 1973 are given in Ayers and Seibel (1973,
p. 42-43) and Seibel and Ayers (1974, p. 171).
Inspection of the table suggests that there may be a seasonal pattern in
the numbers of forms: the numbers of forms at inshore and offshore stations
being similar in April and October but with numbers of forms offshore being

30