AVERAGE NUMBER 
AVERAGE VOLUME (ML) 
SHORE =] 
CENTER= 
POLYCHAETA CRUSTACEA PELECYPODA NEMERTEA 
Figure 6.—Average numbers and volumes (stations combined) of or- 
ganisms caught per sample by taxonomic group and zone, March- 
October 1969. 
Table 2.—Comparisons between zones by taxon and station of the 
mean numbers of organisms collected (paired-comparison /-test). 
Zone 
Taxon Station Shore Center d.f. t 
--— Mean number ---- 
Polychaeta 1 15.00 9.12 14 1.97 
4 50.97 7.31 15 18.46 
6 12.47 5.44 15 3} 117) 
q/ 8.78 9.66 15 —0.67 
8 9.97 36.91 15 1—6.36 
Crustacea 1 6.15 0.50 4 1.05 
4 0.34 1.06 5 —1.38 
6 30.22 3.84 11 22.53 
7 7.50 7.34 10 0.05 
8 10.06 10.41 9 —0.06 
Pelecypoda 1 0.12 0.00 3 16.13 
4 1.03 0.75 10 0.90 
6 0.40 0.06 5 1.89 
7 0.12 0.12 3 0.00 
8 0.28 2.56 14 22.31 
Nemertinea 1 0.44 0.00 8 16.42 
4 0.31 0.19 8 0.77 
6 0.59 0.25 9 1.36 
a 0.44 0.44 9 0.00 
8 0.91 0.32 12 9D) 
1% significance level. 
5% significance level. 
1 
2 
Table 3.—Comparisons between stations by taxon and zone of the mean numbers of organisms collected (two-way analysis of variance). 
Station F-values 
Zone Taxon nn 
1 4 6 7 8 10 Block Treatment 
wana nnn anne nnn nanan nena nee Mean number ----------------------------- 
Shore Polychaeta 15.00 50.97 12.47 8.78 9.97 (3) 1.19 197.75 
Crustacea 6.15 0.34 30.22 7.50 10.06 (3) 13 225 1 4.62 
Pelecypoda 0.12 1.03 0.40 0.12 0.28 (©) 22.02 1 4.75 
Nemertinea 0.44 0.31 0.59 0.44 0.91 () 0.61 1.68 
Center Polychaeta 9.12 7.31 5.44 9.66 36.91 8.59 1.06 18.11 
Crustacea 0.50 1.06 3.84 7.34 10.41 0.12 12.40 2 2.30 
Pelecypoda 0.00 0.75 0.06 0.12 2.56 1.19 13.24 1 9.93 
Nemertinea 0.00 0.19 0.25 0.44 0.32 0.09 1.08 7) shi 
1 1% significance level. 
? 5% significance level. 
and pelecypods exhibited pronounced seasonal varia- 
tion (Fig. 7-10). Catches of crustaceans and 
pelecypods were highest during spring and early sum- 
mer. The significant F-values for blocks (seasons) for 
crustaceans and pelecypods and the nonsignificant 
F-values for polychaetes and nemerteans for the 
pooled station data (Table 3) substantiate these con- 
clusions. The exception to this general pattern was the 
decline in abundance, or absence, of all groups at sta- 
tion 1 in the center zone during June through Sep- 
