Abstract
The growth of C. consobrina of the White Nile near Khartoum was studied during March-December, 1977 from material collected from fish guts every two months. It was found that the growth season extends from February to July in correlation with the rise in temperature. Food was abundant and the concentration of the dissolved calcium in the river water was also increasing.
During the flood season from July to October, the clams entered a resting state as a result of the annual siltation and consequently growth was arrested. Growth rings were found to be formed as a result of the siltation-induced resting state.
There is evidence that little growth occurred during the cooler months from October to December. The development of the false rings on the shells is possibly a result of the changes in the water levels.
Analysis of the growth of the adult clams showed that there is a clear size-time relation; there was close agreement between the calculated maximum sizes and the actual data collected from the field.
Other examples from Sudanese inland waters were also discussed. The role of the annual hydrological cycles in regulating the populations activities and hence the growth of the individuals was found to be important.
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References
Adam, M. E., 1981. Ecological Studies on the Pelecypod Molluscs of the White Nile near Khartoum. M.Sc. Thesis, University of Khartoum.
Abu Gideiri, Y. B., 1969. Observations on Zooplankton distribution at the ‘Mogran’ Khartoum. Rev. Zool. Bot. afr. 79: 1–2.
Beadle, L. C., 1974. The Inland Waters of Tropical Africa. Longmans, London, 360 pp.
Berrie, A. D., 1970. Snail problems in African schistosomiasis. Adv. Parasit. 5: 43–96.
Boss, N. J., 1974. Oblomovism in Mollusca. Trans, am. microsc. Soc. 93: 460–481.
Chamberlin, T. C., 1931. Annual growth of freshwater mussels. Bui. Bur. Fish. Wash. 76: 713–739.
Comfort, A., 1957. The duration of life in molluscs. Proc. malac. Soc. Lond. 32: 219–241.
Crowley, T. E., 1957. Age determination in Anodonta. J. Conch. London 5, (24): 201–207.
Cummins, K. W., 1975. Macroinvertebrates, pp. 170–188. In: M. Owens & B. A. Whitton (eds.), River Ecology, Blackwell Scientific Publications, London.
Entz, B. A. G., 1973. Morphology of Lake Nasser, Working Paper No. 2, Lake Nasser Development Centre, ARE.
Hammerton, D., 1972. The River Nile: A Case History, pp. 171–214. In: R. T. Oglesby, C. A. Carlson & J. A. McCann (eds.), River Ecology and Man, Academic Press, New York and London.
Haskin, H. H., 1954. Age determination in mollusca. Trans. N.Y. Acad. Sci. 16: 300–314.
Holme, H. A. & McIntyre, A. D., 1971. Methods of Study of Marine Benthos. IBP handbook No. 16, Blackwell Scientific Publications, Oxford.
Hurst, H. E., 1952. The Nile. Constale, London, 2nd ed.
Hynes, H. B. N., 1970. The Ecology of Running Waters. Liverpool University Press.
Johnston, P. L., 1979. Growth rings in Dinosour teeth. Nature 278: 235–236.
Lévêque, C., 1971. Equation de von Bertalanffy et croissance des mollusques du lac Tchad, Cah. O.R.S.T.O.M. Ser. Hydrobiol.
Loosanof, V. L. & Engel, J. B., 1947. Feeding of oysters in relation to microorganisms. Science 105: 260–261.
Moghraby, A. I. el, 1977. A study of diapause in Zooplankton in a tropical river: The Blue Nile. Freshwat. Biol. 7: 207–212.
Negus, C. L., 1966. A quantitative study of growth and production of unionid mussels in the River Thames at Reading. J. anim. Ecol. 35: 513–532.
Okland, J., 1963. Notes on population density, age, distribution, growth and habitats of Anodonta piscinalis (Nills) Mollusca, Lamellibranchiata in eutrophic Norwegian lake, Nytt. Mag. Zool. 11: 19–43.
Prowse, G. A. & Talling, J. F., 1958. The seasonal growth and succession of plankton algae in the White Nile. Limnol. Oceanogr. 2 (3): 222–238.
Purchon, R. D., 1977. The Biology of Mollusca. Pergamon Press, 2nd ed.
Russel-Hunter, W. D., 1964. Physiological aspects of ecology in non-marine mollusca. In: K. M. Wilbur & C. M. Yonge (eds), Physiology of Mollusca, 1: 83–126, Academic Press, New York.
Rzoska, J. (ed.), 1976. The Nile, Biology of an Ancient River, Monogr. Biol. 28.
Sinada, F. A., 1972. Ecological and Productivity Studies on the, Phytoplankton of the Blue and White Nile at Khartoum. M.Sc. Thesis, University of Khartoum.
Talling, J. F., 1957. The longitudinal succession of water characteristics in the White Nile. Hydrobiologia 11: 73–89.
Talling, J. F. & Rzoska, J., 1967. The development of plankton in relation to hydrological regime in the Blue Nile. J. Ecol.: 637–662.
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el Moghraby, A.I., Adam, M.E. (1984). Ring formation and annual growth in Corbicula consobrina Caillaud, 1827 (Bivalvia, Corbiculidae). In: Dumont, H.J., el Moghraby, A.I., Desougi, L.A. (eds) Limnology and Marine Biology in the Sudan. Developments in Hydrobiology, vol 21. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6557-7_24
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DOI: https://doi.org/10.1007/978-94-009-6557-7_24
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