CONTENTS 



TABLES 



Page 



1 Intertidal-subtidal densities of Pismo clams in 



Monterey Bay 11 



2 Tests of significant differences among densities of 



Pismo clams in different areas 12 



3 Tests of spatial dispersion of Pismo clams . . . .' 17 



4 Correlation coefficients (r ) between clams and 



sediment parameters 20 



5 Beach profile slopes (foot per foot) of beaches 



with and without clams 21 



6 Number of clams in each stage of gonadal maturity 31 



7 Temperature, chlorophyll a, phaeo-pigment and stage of 



gonadal maturity in Monterey Bay 42 



8 Calculation of Kg, the mean daily growth rate 49 



9 Comparison of average size of year classes at Monterey 



Bay Academy 53 



FIGURES 



1 Map of Monterey Bay and sampling sites 9 



2 Size-frequency distribution of Pismo clams at 



selected beaches, 1972 and 1973 • 13 



3 Vertical distribution of clams at Monterey Bay Academy .... 16 



4 Profiles of beaches with and without clams 22 



5 Female gonad in the inactive stage 28 



6 Female gonad in the early active stage 28 



7 Female gonad in the late active stage 29 



8 Female gonad in the ripe or mature stage 29 



