IV. RESULTS 



1. Sediments . 



The dominant sediment sizes at all stations were fine to coarse sands 

 (0.125 to 1.000 millimeter in diameter). Mean grain sizes were in the 

 medium sand category (0.25 to 0.5 millimeter in diameter), and ranged from 

 a low of 0.25 millimeter at station 2 to a high of 0.33 millimeter at sta- 

 tion 4 (Table 1) . Both borrow stations had slightly larger mean grain 

 sizes than the control stations. 



Table 1. Percent particle-size distribution, percent organic content, 

 and mean grain size of sediments at stations 1, 2, 3, and 4. 



Station 









Particle-size 



distribution 





Pet. 

 organic 

 content 



Mean 

 grain 



Granules 

 (2-4mm) 



Very 



sand 

 l-2mm) 



Coarse 

 sand 

 (0.5mm) 



Medium 



sand 



(0.25- 



0.5mm) 



Very 

 Fine fine 

 sand sand 

 (0.125- (0.063- 

 C.25miii) 0.125mm) 



Silts 



and 



clays 



« 0.063) 











1 



0.1 



0.8 



9.6 



42.3 



43.8 0.8 



2.8 



1.0 



0.25 



2 



0.2 



1.4 



9.6 



'1.3 



37.9 0.8 



R.8 



J.O 



0.25 



3 



0.3 



2.1, 



16.5 



48.9 



24.1 0.9 



6.9 



1.2 



0.30 



It 



O.A 



2.7 



18.7 



49.2 



24.8 0.9 



2.6 



1.6 



0.33 



The sediment fractions in the very coarse sand (1 to 2 millimeters in 

 diameter) category were significantly greater at the borrow stations than 

 at the control stations (ANOVA, p < 0.01). This is evident in the histo- 

 grams (Fig. 5) and cumulative frequency curves (Fig. 6). 



The organic content of the sediments was low, ranging from 1.0 to 1.6 

 percent (replicate means at each station), and showed no significant dif- 

 ferences among stations (Table 1) . 



2 . Fauna . 



Sampling of benthic fauna at the four stations through the year 

 yielded a total of 5,933 individuals comprising 224 species (Apps. A and 

 B) . The dominant taxa were polychaete annelids (86 species and 32.4 per- 

 cent of the individuals) and bivalve mollusks (33 species and 46.3 percent 

 of the individuals) . 



15 



