THE CONCENTRATION AND ACCUMULATION OF RADIOACTIVE PHOSPHORUS BY AN AQUATIC FOOD CHAIN
The food chain consisted of green algae, Ankistrodesmus falcatus var acicularis (A. Br.) West; microcurstaceans, Daphnia magna Straus; and Green Sunfish, Lepomis cyanellus Rafinesque. Differences in concentration and accumulation of radioactive phosphorus due to variations in temperature, radioactive and non-radioactive phosphorus content, and combination of organisms were determined. The average accumulation by all Daphnia at 25 deg C was 2.0 times that at 10 deg C. The Concentration Factor was 1.8 times the 10 deg C value at 25 deg C. The accumulation value for algae at 25 deg C was 2.1 times that at 10 deg C while the Concentration Factor was 3.1 times greater. The data indicate that the presence of algae provided a small increase in the amount of available phosphorus for Daphnia in the first 24 hours. However, over longer periods of time the algae apparently directly and/or indirectly reduced the amount of available phosphorus. The accumulation values for algae ranged from 0.2 to 1937 mu c/gm, and for Daphnia from 0.85 to 574 mu c/gm. The Concentration Factors for algae ranged from 136 to 626,976 and from 286 to 1,002,926 for Daphnia. The data indicate that the amount of P/sup 32/ accumulated and concentrated by Daphnia may be influenced by the surface area available for adsorption of phosphorus. An increase in the number of algae cells increased the surface on which bacteria could grow. It was noted that Green Sunfish acquired the most radioactive phosphorus from a diet of Daphnia and algae, less from Daphnia alone, still less from a diet of algae alone, and none from a non-algae, non-Daphnia diet. It appears that direct and indirect interspeciftc competition may have occurred for phosphorus within the food chain. (auth)
- Research Organization:
- Colorado State Univ., Fort Collins
- NSA Number:
- NSA-16-028732
- OSTI ID:
- 4795920
- Journal Information:
- Dissertation Abstr., Vol. Vol: 23; Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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