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Seasonal concentration, turnover and mode of accumulation of ³²P by the juvenile starry flounder Platichthys stellatus (Pallas) in the Columbia River Estuary

ScholarsArchive at Oregon State University

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Title Seasonal concentration, turnover and mode of accumulation of ³²P by the juvenile starry flounder Platichthys stellatus (Pallas) in the Columbia River Estuary
Names Bolen, John Joseph (creator)
Lyford, John H. (advisor)
Date Issued 1971-10-14 (iso8601)
Note Graduation date: 1972
Abstract The seasonal concentration, turnover and mode of accumulation
of ³²P by the juvenile starry flounder in Alder Slough, a small eco-system in the Columbia River Estuary, was examined during 1969 and
1970.
Levels of ³²P and concentrations of total P were measured to
permit computation of specific activities (nCi³²P/g total P). Seasonal fluctuations of ³²P in flounder collected from Alder
Slough were characterized by spring and summer highs and fall and
winter lows with the difference between the least and most radioactive
fish being approximately 500 pCi/g.
The seasonality of ³²P in flounder
can be attributed to low-high temperature effects on rates of metabolism and food intake.
Concentrations of ³²P
in fall and winter were
primarily regulated by the temperature regime while the higher levels during spring and summer were modified by the
annual spring
freshet and subsequent oceanic influence on estuarine temperature and
salinity structure.
Uptake studies conducted in Alder Slough with caged fish and
the
use of an exponential model failed to produce a
meaningful ³²P
biological half-life for starry flounder.
Failure of the model to describe ³²P accumulation is believed to be due to the assumptions inherent in
its use.
Retention experiments with flounder held in a sea water tank
at Newport, Oregon and caged flounder in the Yaquina River
yielded
effective half-lives equal to or greater than the radionuclide's physical
half-life.
Large differences between the ³²P content of individual fish resulted in biological half-lives with large error terms and
prevented drawing definite conclusions from these studies.
The main pathway of ³²P accumulation by the juvenile flounder
was determined by maintaining fish in Columbia
River water and
feeding radioactive and non-radioactive amphipod-isopod mixtures in
the presence and absence of active sediment.
Flounder populations
fed active food, and active food with active sediment present accumulated 3.3 and 3.7 times the activity of flounder receiving ³²P
from
water alone.
Radioactive sediment did not appear to contribute to the ³²P body burden of the fish.
Phosphorus-32 uptake from water
averaged 24% of that from food plus water.
Flounder fed the radio-active amphipod-isopod mixtures assimilated an average of 16% of the
ingested ³²P.
Genre Thesis/Dissertation
Topic Radioactive pollution of water
Identifier http://hdl.handle.net/1957/46015

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