4-6 



spectrophotometrically according to Strickland and Parsons (1972) . 



After acidification with HCl, phaeophytin was determined and chlorophyll 



3 

 a concentrations (mg/m ) were computed for each sample. 



Following preservation with either formalin or Lugol ' s Iodine 

 solution, aliquots were prepared from each phytoplankton sample and 

 allowed to settle prior to enumeration, according to the Utermohl tech- 

 nique (1958) . Prior to May 1974, phytoplankton taxa were generally 

 identified only to major group; these data appear in earlier reports 

 (NAI, 1973, 1974a, b) . Beginning in May 1974, phytoplankton were iden- 

 tified to genus and species where possible, and abundance estimates 

 (cells/1) were computed for each taxon. 



An index of dominance (Sanders, 1960) was computed by ranking 

 (from 10 to 1) mean abundances of individual phytoplankton taxa over all 

 stations and tides during each month. Monthly ranks were summed for 

 each taxon to yield yearly biological index values. Taxa were then 

 ordered by biological index value as an indicator of overall dominance 

 within each year. 



The following phytoplankton species/taxa were selected for 

 detailed discussion: 



Skeletonema costatum Thalassiosira/Cgclotella sp. 



Thalassionema nit zschio ides Leptocylindrus minimus 

 Heterocapsa triguetra Cryptophyceae 



Zooplankton 



Two-minute daytime plankton tows were collected monthly on 

 both ebb and flood tides at near-surface and near-bottom water levels. 

 From May 1971 through June 1976, collections were made at Stations 3, 6, 

 8, 18 and 20 utilizing a Clark-Bumpus (CB) sampler fitted with a 76pm 

 mesh net; Station 11 was added to this sampling scheme in May 1975 



