402 



R. J. Barsdate et al. 



TABLE 9-5 Sequence of Disappearance of Zooplankton Species from Pond 

 Omega Following the Experimental Oil Spill on 9 July 1975* 



Species Observed 



Observed presence after spill 

 7/10 7/11 7/12 7/14 7/16 7/18 7/21 7/23 7/29 



*An "X" indicates that a representative of that species or group of species was found 

 alive on that day. An "O" indicates that no individual of that species or group was 

 found alive on that day. 

 Source: O'Brien 1978. 



TABLE 9-6 Numbers per Liter of Four Groups of Crustaceans in Ponds 

 C and E June through August 1971 



Daphnia middendorffiana 

 E 0.0 0.1 



C 0.0 0.1 



0.0 0.0 0.0 0.0 0.0 0.0 0.0 

 3.0 1.8 3.6 1.2 3.9 1.4 1.7 



Source: R. Stross (personal communication). 



TABLE 9-7 Zooplankton Production in Ponds B, C and E in 

 1971, 1972 and 1973 



Pond 



1971 



Year 

 1972 1973 



X 



E (Oil) 



B (Control) 



C (Control) 



Source: R. Stross (personal communication). 



