By Diana Valiela Ward
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Additional info for Biological Environmental Impact Studies. Theory and Methods
However, the species diversity o f m a r s h insects was considerable, a n d it s e e m e d p r o b a b l e that this p a r a m e t e r would be affected by the treatments; therefore, this was o n e o f the many variables selected to test against the treatments. In addition to considering the various system characteristics as can didates for testing against the p r o p o s e d factor, we should decide which species should be e x a m i n e d for possible impact. In this selec tion, we can concentrate on the most "important" species, where im portance can be defined in all o f the following ways: 1.
T h e study o f energy flow begins by identification o f the major food chains or the f o o d web. S o m e o f this work is p e r f o r m e d by studying feeding relationships as outlined earlier u n d e r the system structural study. F r o m studies o f such relationships trophic g r o u p s are f o r m e d a n d f o o d web d i a g r a m s drawn. T h e n energy flow t h r o u g h each level or c o m p o n e n t is calculated. T h e energy flow (total assimilation) through a trophic level is the production plus the respiration a n d excretion p e r f o r m e d at that level.
4, 29-39. 1019-1035. Beyers, R. J . , Larimer, J . , O d u m , Η. T . , Parker, R. , a n d A r m s t r o n g , Ν. E . (1963). Publ. Inst. Mar. , Univ. Tex. 9, 454-489. B r e e n , P . Α . , a n d M a n n , Κ . H . ( 1 9 7 6 ) . Mar. Biol. 34, 137-142. Brock, T . D. (1966). " Prentice-Hall, E n g l e w o o d Cliffs, New Jersey. Brock, T . D. (1974). " Prentice-Hall, Englewood Cliffs, New Jersey. C o l e m a n , D . C . ( 1 9 7 3 ) . Oikos 2 4 , 361-366. C r o s s l e y , D . Α . , a n d H o g l u n d , M .