The influence of water on reproductive success and chemical composition of laboratory reared populations of Daphnia magna

The purpose of this study was to examine the effect of two types of natural water and one processed water on the reproductive success of Daphnia magna. It was also of interest to discover whether the chemical composition of the water or that of the food was more important in determining the chemical...

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Bibliographic Details
Published in:Water research (Oxford) 1986-01, Vol.20 (3), p.317-323
Main Authors: Cowgill, U.M., Emmel, H.W., Hopkins, D.L., Applegath, S.L., Takahashi, I.T.
Format: Article
Language:English
Subjects:
chemical composition
demography
Lake Huron
processed water
reproductive success
Tittabawassee River
zooplankton
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Summary:The purpose of this study was to examine the effect of two types of natural water and one processed water on the reproductive success of Daphnia magna. It was also of interest to discover whether the chemical composition of the water or that of the food was more important in determining the chemical composition of the organisms. To achieve this purpose 50 neonates per water type were reared to maturity. Their progeny were enumerated every other day. The study lasted 4 1 2 weeks. In addition, neonates were batch cultured in each water for 4 weeks. These random aged populations, with no individual older than 28 days, were analyzed for their elemental content. Sodium, K, Cu, Mg, Ca, Zn, P, S, Se, Mo, Cl, Fe, Mn, Co and Ni were measured in random populations of D. magna grown in each of the three waters, neonates and adults reared in processed and one natural water and finally, in the three waters themselves. Linear correlation coefficients were calculated among all the variables. Partial correlation coefficients showed that the chemical composition of the organisms is determined by the chemical composition of the rearing water. The largest number of broods, the greatest total number of neonates, the largest mean brood size, the greatest number of neonates per female, occurred among populations reared in lake water. The poorest demographic results were obtained from daphnids reared in processed water. Suggestions are offered for ways in which processed water could be improved as a rearing medium for daphnids.
ISSN:0043-1354
1879-2448
DOI:10.1016/0043-1354(86)90079-5