Doochin and Smith (1951) showed that B. amphitrite settlement and 



growth were influenced by the velocity of water currents and Weiss 

 (1948), Bertholf (1945), and Glaser and Anslow (1949) showed that 

 shock from increased temperature, salinity and copper or reduced 

 pH induced metamorphosis in barnacles and other invertebrates. All 

 of these factors were characteristic of the discharge. Probably, 

 barnacle larvae entrained in the effluent were induced to settle 

 and metamorphose because of the combination of sudden increase in 

 water velocity, temperature, salinity and copper along with the 

 decrease in pH. The high rate of siltation at most of the deeper 

 stations near the discharge prevented successful settlement of 

 barnacle larvae. Many of the test panels were heavily covered with 

 silt at Station 6B during the course of the .study and the quadrat 

 at that station was completely buried with silt. Station 5B, there- 

 fore, was the station at which most of the successful settlement of 

 the entrained barnacle larvae occurred, explaining the peak in num- 

 bers shown in Figure 44. 



Sabellid worms, Branahiomma nigromaculata, were the third most com- 

 mon invertebrate settling on the test panels. They were abundant 

 during August through October, 1970. In October and November, 1970 

 there was a mass mortality of sabellid worms in Safe Harbor. The 

 worms, which live in parchment-like tubes and feed on plankton, 

 dropped out of their protective tubes and died, beginning at the 

 desalination plant sea wall in October, and by December, reaching 

 harbor stations. This mortality was not repeated in October, 1971 

 although the total number of sabellid worms settling on the test 

 panels declined. Figure 45 shows the mean number of sabellid worms 

 settling at the biological stations in Safe Harbor from November, 

 1970 to October, 1971. A decline associated with proximity to the 

 desalination plant is evident. 



All three of the common organisms on the test panels were adversely 

 affected by high concentrations of effluent, but were much more 

 abundant in Safe Harbor than at the control stations or in adjoining 

 harbors. At the control stations, for example, a total of two B. 

 amphitrite y twenty-two B. nigromaculata, and thirty H. norvegioa 

 settled on test panels during the twelve month period. 



DIATOMETERS 



Glass microscope slides were placed in PVC pipe racks at selected 

 stations. Every two weeks, these were exchanged for a new set of 

 slides and the exposed set was examined for protozoans and diatoms. 

 Numbers of species and numbers of individuals per month were plotted 

 (Figs. 46 and 47) and the values compared. Stations 3A, 7A, and lOA 

 were shallow stations at 8 feet (24 meters), whereas Stations 3C, 7B, 

 and lOB were deep stations at 28 feet (8.5 meters). Stations lOA and 



112 



