Table 17. Numbers of species collected within 

 major taxa and depth strata. 



Depth strata 



Polychaeta 



Crustacea 



Mollusk 



Other 



Total 

 (all taxa) 



Intertidal 



3-7-meter 



6-1-meter 



18 

 34 

 46 



23 

 44 

 43 



5 

 14 

 27 



10 

 13 

 15 



56 

 105 

 131 



TOTAL 



(all depths; 



not additive) 



56 



64 



29 



21 



170 



Table 18. Average abundance and number of species per sample 

 as a function of intertidal stratum and depth 

 during the Imperial Beach study. ' 





INTliRTIDAL 



SUBTIDAL 



Depth strata 



Upper 



Mid 



Lower 



3 



7 meters 



6.1 meters 



Number of 

 surveys 



13 



13 13 





13 11 



Number of 











animals 

 per sample 



1.54 



sig. 

 .05 7.15 4.55 



sig. 

 .05 



27.35 30.59 



Number of 











species 

 per sample 



0.76 



sig. 

 .05 1.70 1.79 



sig. 

 .05 



8.70 10.35 



^All within-depth stations from different sampling dates were 

 combined; sample unit = 8-centimeter diameter by 10-centimeter 

 depth. Differences between successive strata or depths sig- 

 nificant at 5-percent level are indicated by sig. 



.05. 



79 



