Table 1.—List of taxonomic groups and total numbers of specimens collected by station and zone. 
Station and zone 
Taxonomic group 1 4 6 7 8 10 Stations combined 
Sie S} Ce S} Ce Ss} G2 Si (ee S3 (CH S} (Cx 
Phylum Annelida: 480 292 1,631 234 399 174 281 309 S19 ees (*) 275 3,110 2,465 
Class Polychaeta: 
Family: 
Nereidae 3 0 ul 3 28 20 68 40 36 247 ee) 15 142 102 
Terebellidae 0 0 3 1 i 2 3} 6 8 IP ©) 2 21 23 
Capitellidae 432) 2905 136015 9 9229 348 148 204 241 268 ~~ 1,100 + 1G) 188 2,853 2,196 
Maldanidae 0 0 0 0 0 0 2 0 0 6) 1G): 0 2 6 
Arenicolidae 0 0 0 0 7 0 0 2 3 0 (3) 0 10 D 
Unidentified 45 D: 20 1 9 4 4 20 4 39 (°) 70 82 136 
Phylum Arthropoda: 197 16 11 34 967 123 240 235 322 333 (°) 4 1,737 745 
Class Crustacea: 
Family: 
Ampeliscidae 0 0 9 32 318 98 92 228 64 313 (3) 4 483 675 
Corophiidae 186 0 1 D) 257 17 18 5 62 qf (°) 0 524 31 
Pinnotheridae 2 0 0 0 0 0 0 0 0 ): 1 0) 0 2 0 
Unidentified 9 16 1 0 392 8 130 2 196 13 (°) 0 728 39 
Phylum Mollusca: 4 0 33 24 13 2 4 4 9 82 (°) 38 63 150 
Class Pelecypoda: 
Family: 
Tellinidae 0 0 8 18 3 0 0 2 0 Si) 6 11 34 
Solecurtidae 3 0 4 0 7 0 4 0 6 64 (3) 0 24 64 
Mactridae 1 0 0 0 0 0 0 0 0 Oe ©) 0 1 0 
Mytilidae 0 0 0 0 2 0 0 0 0 OWN Fe) 0 2 0 
Solenidae 0 0 0 0 0 0 0 0 0 Oi) 8 0 8 
Semelidae 0 0 21 6 1 2 0 2 3 10 () 24 25 44 
Phylum Nemertinea: 14 0 10 6 19 8 14 14 29 105° 1@) 3 86 4] 
Shore. 
1 
2 Center of waterway. 
3 No sampling. 
were dominant comprising 66.4% of the number and 
44.0% of the volume of organisms caught (Fig. 6). 
Crustaceans (Arthropoda) were second in number 
(29.6%) but lowest in volume (4.4%). Third in abun- 
dance (2.5%), but second in volume (40.8%), were cal- 
cified pelecypods (Mollusca). Nemerteans (Nemer- 
tinea) were lowest in number (1.5%) and third in vol- 
ume (10.7%). 
The average number of organisms of each phylum 
collected and the results of statistical comparisons of 
the data by zone and station are shown in Tables 2 and 
3. Abundance values were compared between zones at 
each station with a paired t-test and between stations 
within each zone with a two-way analysis of variance. 
The average of two samples was used as the observa- 
tion. 
Average total catch (all phyla combined) was higher 
in the shore zone than in the center zone, but this 
difference was not consistent for all phyla or stations 
(Fig. 6, Table 2). In the canals (stations 1 and 4), the 
average catches for each phylum were greater along 
shore than in the center zone with the exception of 
crustaceans at station 4. Only 5 of the 16 differences, 
however, were statistically significant. Differences in 
average catch between zones in the marsh varied 
greatly among stations. At station 6 all phyla were 
caught in greater numbers along shore, significantly so 
for polychaetes and crustaceans. At station 7, average 
catches for each phyla were about the same in each 
zone. At station 8 the average numbers of polychaetes 
and pelecypods were significantly greater in the 
center, whereas nemerteans were significantly more 
abundant along shore. 
Staustically significant differences in abundance be- 
tween stations were found for each taxonomic group in 
each zone except nemerteans in the shore zone (Table 
3). In the shore zone, average catches were highest at 
station 4 for polychaetes and pelecypods, at station 6 
for crustaceans, and at station 8 for nemerteans. In the 
center zone, average catches were highest at station 8 
for all groups except nemerteans, for which average 
catch was greatest at station 7. 
In general, catches of polychaetes and nemerteans 
exhibited only slight seasonal variations; crustaceans 
