preliminary data indicate Station C to have had the highest concen- 

 tration of oil in water during the acute phase. But the samples also 

 indicate relatively high amounts of aromatic hydrocarbons in the tissues 

 of My t i 1 li s from Station G. Together with data from sediment traps and 

 Ma coma halthica , this shows that Tsesis oil must be considered widely 

 spread in the area. Station G can thus not be considered as a "non- 

 affected" station, even though the samples of the Fucus fauna showed no 

 clear reduction of the fauna. 



The data presented here clearly demonstrates drastic effects on the 

 animal life of the Fucus community. On the other hand recolonization at 

 several stations started soon after the acute phase. 



7.2.5 References 



Blumer, M. , Sanders, H.L., Grassle, J.F., and Sass, J. 1971. A small 

 oil spill. Environment 13(2): 1-12. 



Dybern, B.I., Ackefors, H., and Elmgren, R. (Eds.). 1976. Recommenda- 

 tions on methods for marine biological studies in the Baltic sea. 

 Baltic Marine Biologists Publ. 1: 1-98. 



Guterstam, B. 1977. An in situ study of the primary production and 



metabolism of a Baltic Fucus vesiculosus community. In: Keegan, 

 B.F., P. O'Ceidigh and P.J.S. Boaden (Eds.): Biology of Benthic 

 Organisms. Pergamon Press, Oxford, 311-319. 



Haage, P. 1969. Bl9st§ngsbaltet . Zoologisk Revy 31:21-22. (In Swedish). 



Jansson, A.M. 1974. Community structure modelling and simulation of the 

 Cladophora ecosystem in the Baltic sea. Contrib. Asko Lab. Univ. 

 Stockholm 5:1-129. 



Jansson, B.O. and Wulff, F. 1977. Ecosystem analysis of a shallow 

 sound in the northern Baltic - A joint study by the Asko group. 

 Contrib. Asko Lab., Univ. Stockholm 18:1-160. 



Lee, R.F. 1977. Accumulation and turnover of petroleum hydrocarbons in 



marine organisms. In: Wolfe, D.A. (ed.). Fate and effects of petroleum 

 hydrocarbons in marine organisms and ecosystems. Pergamon Press. New 

 York, 60-70. 



Linden, 0. 1976. Effects of oil on the amphipod Gammarus oceanicus . 

 Environ Pollut. 10:239-250. 



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