The seasonal biological surveys of 1971 / John C. Ayers, Samuel C. Mozley, John A. Stewart.

Search for Riverine Species. E. F. Stoermer (Great Lakes Research Division, Univ. of Michigan) has provided the following list of phytoplankton
species and groups which, if heavily dominant in a station collection, could
be taken as evidence of the presence of river water at that station.
Amphora ovalis Navicu a costulata
Amphora sp. Navicula gastrum
Cyclotella meneghiniana Navicula sp.
Melosira granulata Nitzschia acicularis
Melosira granulata v. angustissima Nitzschia sp.
Navicula capitata yjnedra ulna
Navicula decussis
Each station collection species list in Appendix B was searched for the
presence and degree of dominance of each of these organisms. Of the total
990 species or groups collected at all stations during the April survey, only
21 were of these riverine forms; of 1,799 total species or groups taken at
all the stations of the July survey, only 51 were riverine forms; of 1,589
total forms taken during the September survey, only 35 were riverine forms;
in November 985 species and groups were captured at all the stations of the
survey, of these only 51 were riverine forms.
In no case did the riverine forms achieve dominant or codominant abundance; in practically all the appearances of these forms they comprised less
than 1% of the station population. During the seasonal surveys of 1971 the
phytoplankton showed no evidence of substantial presence of river water.
A.5 STUDY OF ZOOPLANKTON
METHODS
On 15 April, 9 July, 2 September, and 8 November 1971 zooplankton were
collected in major coverages of the Cook survey grid. Zooplankton were collected with a 0.5 m diameter #10-mesh net (158p aperature) towed vertically
from near the bottom to the surface. A flowmeter mounted in the net mouth
measured the volume of water passing through the net. Each sample was preserved with Koechies fluid, labeled, and then transported to the laboratory
for examination.
Two methods were used to count the samples, the two methods giving

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