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By Diana Valiela Ward

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Alternatively a n d m o r e directly, it is possible to m e a s u r e the reproduction a n d growth o f the animals in question, since production is d u e to both o f these p r o ­ cesses. , V a n H o o k a n d D o d s o n , 1974). In m a k i n g the extrapolations, it is important to k e e p in m i n d the fact that a population usually consists o f several a g e classes o f varying energy b u d g e t s , growth rates, a n d reproductive rates. y 1975) unless only o n e a g e class enters into the questions being investigated.

R e s . Div. M o n o g r . N o . 3, p p . 1 8 1 - 1 9 4 . V P I , B l a c k s burg, Virginia. H o b b i e , J . E . , C r a w f o r d , C . C , a n d W e b b , K . L . ( 1 9 6 8 ) . Science H o l l i n g , C . S . ( 1 9 7 3 ) . Annu. Rev. J e f f r i e s , H . P .

However, the phytoplankton c o m p o s i ­ tion c h a n g e d (Ryther, 1954) from the n o r m a l mixture o f diatoms, green flagellates, a n d dinoflagellates to almost all small g r e e n flagel­ lates (Nannochlons a n d Stichococcus, neither o f which was d o m i n a n t previously). T h e shift in species composition was apparently b e c a u s e SYSTEM FUNCTIONAL STUDY 41 the a d d e d nutrients were in organic f o r m (which the new species could readily utilize but which the "normal" species could not) a n d because there was a low nitrogen to p h o s p h o r u s ratio (which also favored the new d o m i n a n t species).

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