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The enhancing effect of spawning on elimination of a persistent polychlorinated biphenyl from female yellow perch
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pro~on activity in t h e l a k e H a t e r . Since this property is also function of primary production• a negative feed-back mechanism can be postulated for ~he b i o t a / m e S a interaction. If t h e ~Ho me~als exceed a certain ~hreshold value, ~he b i o t a adapts i~sel primarily on the level o f ~he p r i m a r y producers This ada ~ion results ;n a phytoplank~on community having a reduced cap:city ~o a s s i m i l a t e ~race metals.
T h e HERL m e s o c o s m a p p r o a c h for s~udying sedimen~-Ha~er in~erac~ions and eco~oxicology San~schi PH EAHAG, S H i s s F e d e r a l Institute for Technology, CH-8600 Dubendor~ • SHitzerland ENVIRON. TECHNOL. L E T T . ; 6 / 8 ( 3 3 5 - 3 5 0 ) / 1 7 8 5 / The m o s o c o s m s o f ~he N a r i n e Ecosystems Research Laboratory of Narragansett, R.I., USA h a v e b e e n s h o N n ~o s i m u l a t e biological and geochemical processes occurring i n ~he N a r r a g a n s e ~ B a y . Th~ s ~ u d z e s i n ~ h e s e m e s o c o s m s a n d ~he f i e l d and single process characterization experiments on l a b o r a t o r y scale which are offer n e e d e d ~o v a l i d a t e or verify experimental results are discussed in ~erms of hen relevan~ ~he e x c h a n g e o f p a r t i c l e s , carbon, nutrients, oxygen, ~race me~als or ~race contaminants a c r o s s ~h( sedimen~-wa~er in~erface is for the understanding of biological and chemical processes occurring in coastal marine ecosystems, and for the function of the ecosystem itself.
The e n h a n c i n g effec~ o f s p a n n i n g on e l i m i n a t i o n of a persis~en~ polychlgrina~ed biphenyl from female yelloN perch voazonik NJ~ P a t e r s o n RE Depar~mon~ of Pharmacology and Toxicology, Hedical College of Hisconsin, NilHaukee, NI 53ZZ6, United S~a~es of America FUNDAN. APPL. T O X I C O L . ; 5 / 4 ( 7 7 0 - 7 7 6 ) / 1 9 8 5 / Distribution and elimination of 2,5,2',5'~e~rachloro(sup 1sup ~C)biphenyl ( ~ - C B ) H e r e s ~ u d i e d f o r 6 m~h a f t e r exposing sexually ma~ure female yelloH p e r c h ~o ~he c o m p o u n d i n H a ~ e r a n ( transferring ~hem ~o f l o H i n g ~-CB-free Namer. Perch tha~ Nero e x p o s e d i n J a n u a r y s p a n n e d xn H a y , a n d t h e s ~ u d y Has ~ e r m i n a ~ e d in June. During ~he f i r s ~ ~ . 5 m~h a f t e r exposure, ~he ~ . S f o r ~hole-body elimination Has 22 ~ k , p r i m a r i l y by elimina*ion of ; - C B f r o m ~he v i s c e r a and carcass. During spanning, enhanced elimination (*.5 < 0 . 7 N k ) Has d u e ~o t h e v o i d i n g of eggs containing ~-CB. After spanning, Nhole-body elimxna*ion returne( to a sloNer ra~e (*.5 = 16.3 NK). Prior * o ~he enhancemen~ i n ;-CB elimination ra~e during spanning, ~ h e r e Has a redistribution o f ~-CB r e s i d u e s N i ~ h x n ~he b o d y o f ~he p e r c h ~hich ~as characterized by a *ransfer o f ~-CB r e s i d u e s from )rimarily the carcass and viscera ~o e g g s . THe H o o k s a f t e r exposure, 30~ o f ~he i n i t i a l ~ - C B b o d y ~ u r d e n Has d i s ~ r i b u * e d t( t h e e g g s . H h e r e a s ~us~ ~ r i o r ~o s p a N n z n g , a b o u t 50~ Has p r o s e n ~ ~n ~ h x s t i s s u e . These fxndings demonstrate ~ha~ e g g m a t u r a t i o n and s p a n n i n g resul~ in a significan~ reduction i n ~he b o d y )urden of a porsisten~ polychlorina~ed biphenyl in a lean-fish species.
~ffec~ of commercial formulation of four organophosphorus Lnsec~icides on t h e o v a r i e s of a freshwater ~eleos~, Hys~us ri~a~us (Bloch). A histological and his~ochemical s~udy (aider S; Upadhyaya N )apartment of Zoology, Banaras Hindu University, Varanasi ZZ1 105, I n d i a I . ENVIRON. S C I . HEALTH / PART B P E S T I C . FOOD C O N T A H I N . ; 2.0/3 3Z1-340)/1985/ the chronic effeck of an exposure ~o a s u b l e t h a l concentration )f commercial formulation of 6 organophosphorus insecticides,
pro~on activity in t h e l a k e H a t e r . Since this property is also function of primary production• a negative feed-back mechanism can be postulated for ~he b i o t a / m e S a interaction. If t h e ~Ho me~als exceed a certain ~hreshold value, ~he b i o t a adapts i~sel primarily on the level o f ~he p r i m a r y producers This ada ~ion results ;n a phytoplank~on community having a reduced cap:city ~o a s s i m i l a t e ~race metals.
T h e HERL m e s o c o s m a p p r o a c h for s~udying sedimen~-Ha~er in~erac~ions and eco~oxicology San~schi PH EAHAG, S H i s s F e d e r a l Institute for Technology, CH-8600 Dubendor~ • SHitzerland ENVIRON. TECHNOL. L E T T . ; 6 / 8 ( 3 3 5 - 3 5 0 ) / 1 7 8 5 / The m o s o c o s m s o f ~he N a r i n e Ecosystems Research Laboratory of Narragansett, R.I., USA h a v e b e e n s h o N n ~o s i m u l a t e biological and geochemical processes occurring i n ~he N a r r a g a n s e ~ B a y . Th~ s ~ u d z e s i n ~ h e s e m e s o c o s m s a n d ~he f i e l d and single process characterization experiments on l a b o r a t o r y scale which are offer n e e d e d ~o v a l i d a t e or verify experimental results are discussed in ~erms of hen relevan~ ~he e x c h a n g e o f p a r t i c l e s , carbon, nutrients, oxygen, ~race me~als or ~race contaminants a c r o s s ~h( sedimen~-wa~er in~erface is for the understanding of biological and chemical processes occurring in coastal marine ecosystems, and for the function of the ecosystem itself.
The e n h a n c i n g effec~ o f s p a n n i n g on e l i m i n a t i o n of a persis~en~ polychlgrina~ed biphenyl from female yelloN perch voazonik NJ~ P a t e r s o n RE Depar~mon~ of Pharmacology and Toxicology, Hedical College of Hisconsin, NilHaukee, NI 53ZZ6, United S~a~es of America FUNDAN. APPL. T O X I C O L . ; 5 / 4 ( 7 7 0 - 7 7 6 ) / 1 9 8 5 / Distribution and elimination of 2,5,2',5'~e~rachloro(sup 1sup ~C)biphenyl ( ~ - C B ) H e r e s ~ u d i e d f o r 6 m~h a f t e r exposing sexually ma~ure female yelloH p e r c h ~o ~he c o m p o u n d i n H a ~ e r a n ( transferring ~hem ~o f l o H i n g ~-CB-free Namer. Perch tha~ Nero e x p o s e d i n J a n u a r y s p a n n e d xn H a y , a n d t h e s ~ u d y Has ~ e r m i n a ~ e d in June. During ~he f i r s ~ ~ . 5 m~h a f t e r exposure, ~he ~ . S f o r ~hole-body elimination Has 22 ~ k , p r i m a r i l y by elimina*ion of ; - C B f r o m ~he v i s c e r a and carcass. During spanning, enhanced elimination (*.5 < 0 . 7 N k ) Has d u e ~o t h e v o i d i n g of eggs containing ~-CB. After spanning, Nhole-body elimxna*ion returne( to a sloNer ra~e (*.5 = 16.3 NK). Prior * o ~he enhancemen~ i n ;-CB elimination ra~e during spanning, ~ h e r e Has a redistribution o f ~-CB r e s i d u e s N i ~ h x n ~he b o d y o f ~he p e r c h ~hich ~as characterized by a *ransfer o f ~-CB r e s i d u e s from )rimarily the carcass and viscera ~o e g g s . THe H o o k s a f t e r exposure, 30~ o f ~he i n i t i a l ~ - C B b o d y ~ u r d e n Has d i s ~ r i b u * e d t( t h e e g g s . H h e r e a s ~us~ ~ r i o r ~o s p a N n z n g , a b o u t 50~ Has p r o s e n ~ ~n ~ h x s t i s s u e . These fxndings demonstrate ~ha~ e g g m a t u r a t i o n and s p a n n i n g resul~ in a significan~ reduction i n ~he b o d y )urden of a porsisten~ polychlorina~ed biphenyl in a lean-fish species.
~ffec~ of commercial formulation of four organophosphorus Lnsec~icides on t h e o v a r i e s of a freshwater ~eleos~, Hys~us ri~a~us (Bloch). A histological and his~ochemical s~udy (aider S; Upadhyaya N )apartment of Zoology, Banaras Hindu University, Varanasi ZZ1 105, I n d i a I . ENVIRON. S C I . HEALTH / PART B P E S T I C . FOOD C O N T A H I N . ; 2.0/3 3Z1-340)/1985/ the chronic effeck of an exposure ~o a s u b l e t h a l concentration )f commercial formulation of 6 organophosphorus insecticides,