396 



R. J. Barsdate et al. 



TABLE 9-3 Rates of Photosynthesis of the Benthic Algae on 16 August 1971 

 in Ponds E, C and J 



Source: D. Stanley (personal communication). 



The general results from spills in lakes in arctic Alaska are similar to 

 the pond results. For example, Jordan et al. (1978) found no significant 

 increases in numbers (direct counts) in the water or sediment of a lake one 

 year after the addition of oil (0.25 liters m ~ ^ or 0. 1 8 ml liter ~ ' ). They also 

 found that glucose uptake rates were unaffected by the oil but that the 

 uptake of hexadecane and napthalene increased drastically over controls 

 (but only after 1 10 hours of incubation). Another study by Horowitz et al. 

 (1978) measured high numbers of hydrocarbon-utilizing organisms in the 

 sediments of a lake near Barrow 7 years after a large gasoline spill. From 

 these and other studies it appears that large numbers of hydrocarbon- 

 utilizing microbes are present only when there are continual additions of 

 oil or gasoline. 



E 

 w 



(0 



o 



E 

 o 



800 - Pond E 



400 



lO 



'e 



E 



w 



o 



E 

 o 



1200 



800 



400- 



10 20 

 Jun 



1971 



FIGURE 9-5. Bio mass of 

 phytoplankton algae (mg 



Sep H-er weight m'^) in Ponds E 



~ and C. 



