CONTENTS 



TABLES- -Continued 



Page 



3 Significant features of intertidal stations at Imperial 



Beach for all surveys 31 



4 Total volume of coarse sand (diameter larger than 0.5 



millimeter) retained from 90 cores (45 liters) per 



intertidal station, survey V, November 1977 35 



5 Water temperature at Imperial Beach for all stations for 



each survey date 45 



6 Calculated horizontal velocity of wave motion (meters per 



second) at the bottom for three wave energies, three depths, 



and for three wave periods 47 



7 Average number of samples needed to estimate abundance and 



species per sampling unit at precision levels of 50 and 30 



percent at a 95-percent confidence level 49 



8 Frequencies of different distribution types for abundance 



per sample and species per sample 49 



9 Precision of estimate (P) at 95-percent confidence level for 



species per sample and abundance per sample 50 



10 Intertidal organisms occurring at densities greater than 



50 per square meter 55 



11 Rank order of abundance of species from combined surveys for 



each depth 56 



12 Numbers of species sampled at beach stations and directly 



offshore at dredge disposal stations A and B and at control 

 station C 66 



13 Station similarity indices between surveys at dredge disposal 



terminus station B 67 



14 Organisms from 3.7-meter depth occurring at densities greater 



than 500 per square meter 69 



15 Organisms from 6.1 -meter depth occurring at densities greater 



than 500 per square meter 70 



16 Biomass, converted to grams wet weight per square meter at 



Imperial Beach sampling stations 76 



17 Number of species collected within major taxa and depth strata . 79 



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