OUVER ET AL.: RELATIONSHIPS BETWEEN WAVE DISTURBANCE AND ZONATION 



10000 



w 7500 



\ 



CO 



_J 



< 



ID 

 Q5000 



> 



2500 



SOUTHERN TRANSECT 



Total 



Polychaeta 



Crustacea 



Mollusca 



32 







I .■••■ 



M-l M-2 M-3 M-4 M-5 



tern) (9m) (14 m) (18 m) (24m) 



n«l08 n=l07 n»30 n=l4l n=28 



STATION 



Figure 7. — Mean number of individuals per square meter and 

 95% confidence limits of major groups along the southern tran- 

 sect in Monterey Bay, Calif, (estimates based on n can cores). 



24 



o 

 o 



o 



Q. 



8 



SOUTHERN TRANSECT 

 — Total 



Polychaeta 



Crustacea 



Mollusca 



^ M-l M-2 M-3 M-4 M-5 

 (6m) (9m) (14m) (18m) (24m) 

 n=l08 n=l07 n=30 n=l4l n=28 



STATION 



Figure 8. — Mean number of species per can core (0.018 m^) and 

 95% confidence limits of major groups along the southern tran- 

 sect in Monterey Bay, Calif. 



ent reasons (e.g., mating, food, substrate move- 

 ments). Despite these differences, almost all the 

 crustaceans in the crustacean zone were active, 

 free-burrowing species and few inhabited tubes. 



Other Animal Groups 



The polychaetes were much less abundant than 

 crustaceans in the crustacean zone (Table 2; Fig- 

 ure 7). Scoloplos armiger, Chaetozone setosa, 

 Nephtys caecoides, and Dispio uncinata were the 

 most characteristic species at the shallowest sta- 

 tion (M-l). Prionospio pygmaea and Magelona 

 sacculata maintained highly ephemeral popula- 

 tions near the surf zone (see Seasonal Patterns). 

 The uncommon onuphid Onuphus eremita was 

 only encountered at 6 m (M-l). In general, the 

 more frequent members of the polychaete as- 



1500 



YEARS 



Figure 9. — Complementary temporal variations of Eohaus- 

 torius sencillus and E. sawyeri at M-l (6 m) in Monterey Bay, 

 Calif. 



445 



