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T h e a r e a h a d p r e ­ viously s u p p o r t e d a considerable oyster population, which was u s e d commercially. When the phytoplankton composition c h a n g e d , the oysters a n d other shellfish starved to death in spite o f c o n s u m i n g the small g r e e n flagellates in large quantities. T h e oysters were a p p a r ­ ently unable to digest the new phytoplankton species. T h e oysters a n d several other shellfish d i s a p p e a r e d from the area, a n d reintroduction attempts failed.

1 9 6 9 ) . Ecology 49, B e r n a r d , J . M . ( 1 9 7 4 ) . Ecology 55, 350-359. 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 .

VQs. 6 ' - =6 1 1 Η log 5 4 3 ο "·χ 1 f ~/\T^""—-°—? 1 / \. · · e //=-2/°ι logy°i| Ii 2 July 4 6 8 10 September 12 Weeks Fig. 2 . 2 . A n e x a m p l e o f l o w e r e d s p e c i e s diversity i n d e x in r e s p o n s e to a n insecticide stress. T h e insecticide Sevin was a p p l i e d to a millet field, which was sampled for ar­ t h r o p o d s (a m a t c h e d c o n t r o l a r e a w a s a l s o s a m p l e d ) . T h e l o w e r g r a p h s h o w s t h e e f f e c t s o f the stress o n a g e n e r a l i n d e x o f total diversity (//, the S h a n n o n - W e a v e r index).

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