SCHERBA and GALLUCCI: SYSTEMATIC SAMPLING OF INFAUNA 



1-3. It was necessary to pool the winter samples 

 that were used to test for homogeneity (see Sta- 

 tistical Procedures) within each area. The samples 

 in each area were considered to be from one 

 subarea to correspond to the subareas used for the 

 spring and summer sampling. The spring and 

 summer samples were collected exclusively from 

 subareas IB, 2A, 3A, and 4A. The data in Tables 2 

 and 3 are for the species of bivalves and poly- 

 chaetes which could be identified from the 

 samples. 



Sediment 



The sediment data (Table 1) and statistical 

 analyses confirm the existence of a particle size 

 gradient from the closed (south) end to the open 

 (north) end of the bay. Subareas IB and 4A appear 

 similar in Table 1, but subarea IB is located in the 

 closed end of Garrison Bay (Figure 1) which is 

 much muddier with more fine grained particles 

 and has poorer drainage than subarea 4A. Because 

 the data suggest that subareas IB and 4A contain 

 approximately the same proportion of coarse grain 

 particles (i.e., ^1.981 mm), a qualitative descrip- 

 tion was used to supplement the quantitative 

 analysis based on grain size composition by per- 

 centage weight: the 1.981-mm sieve in samples 

 from subarea IB contained large amounts of shell 

 fragments, which will remain in suspension longer 

 due to their flattened shape, while the same sieve 

 size in subarea 4A contained mostly round pebbles, 

 which settle more rapidly, and few shell frag- 

 ments. Thus, despite their heavy weight, shell 

 fragments were carried into the quiet part of the 

 bay. 



Samples from subarea 2A often had added 

 weight in the 1.981-mm sieve in the form of rocks 

 of about 5 cm across. This is probably the result of 

 the activities of early settlers or of recent an- 

 thropoligical investigations. 



The K-S procedures (a = 0.10) confirmed the 

 existence of a north-south sediment gradient 

 between similarly numbered strata in all seasons 

 between all four subareas. All six of the null 

 hypotheses (1) of equality were rejected. 



The sources of this gradient were located by 

 using the K-S procedure (a = 0.10) to compare all 

 combinations of subarea pairs and seasons for 

 similarly numbered strata. This resulted in the 

 testing of 36 null hypotheses (1) of no difference, of 

 which 25 were rejected and the remainder accept- 

 ed. Thus, a gradient may be said to be the result of 



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