Biological Environmental Impact Studies. Theory and Methods by Diana Valiela Ward

By Diana Valiela Ward

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1973). " Ann A r b o r Sei. , A n n A r b o r , M i c h i g a n . G o l l e y , F . B . ( 1 9 6 0 ) . Ecol. Monogr. 30, 187-206. H a r t e , J . , a n d L e v y , D . ( 1 9 7 5 ) . In " U n i f y i n g C o n c e p t s i n E c o l o g y " ( W . Η . v a n D o b b e n a n d R. Η . ), p p . 2 0 8 - 2 2 3 . J u n k , T h e H a g u e . H e a l d , E . J . ( 1 9 6 9 ) . T h e p r o d u c t i o n o f o r g a n i c d e t r i t u s in a s o u t h F l o r i d a e s t u a r y . P h . D . Thesis, Univ. of Miami, Coral Gables, Florida.

C h a n g e s in these indices can be o f value as an indication o f structural a n d p e r h a p s o f functional c h a n g e s in a c o m m u n i t y in r e s p o n s e to perturbations. , by various a u t h o r s ) is in s o m e ways similar to the concept o f ecological d o m i n a n c e . It has b e e n u s e d to refer to a species that h a s a strong influence o n m o s t other o r g a n i s m s in the community a n d , if r e m o v e d , would drastically c h a n g e the community characteristics (Paine, 1969; Dayton, 1971).

T h e g r o u p i n g of organisms with similar f o o d sources constitutes trophic grouping; detailed species studies a r e often u n n e c e s s a r y if t r o p h i c g r o u p s a r e fairly h o m o g e n e o u s . , little food specificity), a n d that the salt m a r s h e x p o r t s a b o u t 4 5 % o f its net production to the estuary by tidal flushing (see Fig. 4). A l t h o u g h s o m e o f these conclu­ sions have been somewhat modified since T e a l ' s study, it is obvious that T e a l was formulating ecologically i m p o r t a n t hypotheses, a n d that these were possible b e c a u s e o f the b r e a d t h o f the study.

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