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The Water-fern Salvinia molesta in the Sepik River, Papua New Guinea

Published online by Cambridge University Press:  24 August 2009

David S. Mitchell ,
Tomislav Petr  and
Anthony B. Viner
David S. Mitchell
Affiliation:
Respectively: FAO Consultant, Environmental Manager, and Visiting Scientist, Office of Environment and Conservation, Central Government Offices, Waigani, Port Moresby, Papua New Guinea.
Tomislav Petr
Affiliation:
Respectively: FAO Consultant, Environmental Manager, and Visiting Scientist, Office of Environment and Conservation, Central Government Offices, Waigani, Port Moresby, Papua New Guinea.
Anthony B. Viner
Affiliation:
Respectively: FAO Consultant, Environmental Manager, and Visiting Scientist, Office of Environment and Conservation, Central Government Offices, Waigani, Port Moresby, Papua New Guinea.
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Extract

Since 1977 the Sepik River backwaters between Pagwi and Angoram in Papua New Guinea have become increasingly covered by the exotic water-fern Salvinia molesta. By May 1979, Salvinia covered about 80 km2. Water chemical analyses for dissolved substances give no evidence that nutrients in the Sepik River and ‘lagoons’ might become limiting enough to affect the Salvinia population. The physical impact of the plant is reflected especially in the decline of the fisheries for Saltfish Tilapia (Sarotherodon mossambicus), crocodile hunting, collection of sago-palm, and in the slowing down or complete elimination of water transport. As a consequence, people in a number of villages are unable to reach markets and children cannot go to schools.

A programme of management has been formulated which will involve the United Nations, central and provincial governments, and local inhabitants. However, it should be understood that there is little chance of complete elimination of the weed from Sepik River backwaters.

Type
Main Papers
Information
Environmental Conservation , Volume 7 , Issue 2 , Summer 1980 , pp. 115 - 122
Copyright
Copyright © Foundation for Environmental Conservation 1980

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References

REFERENCES

Chiaudani, G. & Vichi, M. (1976). Comparison of different techniques for detecting limiting or surplus nitrogen in batch cultures of Selenastrum capricomutum. Water Res., 10, pp. 725–9.CrossRefGoogle Scholar
Cook, C. D. K. & Gut, B. J. (1971). Salvinia in the state of Kerala, India. Pest. Artic. & News Summ. (PANS), 17, pp. 438–47.Google Scholar
Denton, J. (1965). Relationships Between the Chemical Composition of Aquatic Plants and Water Quality. M.S. thesis, Auburn University, Auburn, Alabama 38830: [not available for checking].Google Scholar
Farrell, T. P. (1979). Control of Salvinia molesta and Hydrilla verticillata in Ixike Moondarra, Queensland. Australian Water Resources Council Seminar on Management of Aquatic Weeds, Canberra 15–16 02, pp. 57–71 (mimeogr.).Google Scholar
Gaudet, J. J. (1973). Growth of a floating weed, Salvinia, under standard conditions. Hydrobiologia, 41, pp. 77–106.CrossRefGoogle Scholar
Mitchell, D. S. (1970). Autecological Studies of Salvinia auriculata Aubl. Ph.D. thesis, University of London: 669 pp. incl. App., illustr. (typescript).Google Scholar
Mitchell, D. S. (1979). The Incidence and Management of Salvinia molesta in Papua New Guinea. Office of Environment and Conservation, and Department of Primary Industry, P.O. Box 2417, Konedobu, Papua New Guinea: v + 51 pp., illustr., + 2 tables + ‘Annexure’ + ‘Flow-chart of Action Plan for the Management of Salvinia in Papua New Guinea’.Google Scholar
Mitchell, D. S. & Rose, D. J. W. (1979). Factors affecting fluctuations in extent of Salvinia molesta on Lake Kariba. Pest. Artic. & News Summ. (PANS), 25, pp. 171–7.Google Scholar
Mitchell, D. S. & Tur, N. M. (1975). The rate of growth of Salvinia molesta (Salvinia auriculata auct.) in laboratory and natural conditions. J. Appl. Ecol., 12, pp. 213–25.CrossRefGoogle Scholar
Petr, T. (Ed.) (1977). Workshop 6 May 1977: Purari River (Wabo) Hydroelectric Scheme Environmental Studies Vol. 1. Office of Environment and Conservation, Waigani, and Department of Minerals and Energy, Konedobu, Papua New Guinea: 70 pp.Google Scholar
Petr, T. (Ed.) (1977). Workshop 6 May 1977: Purari River waters of two planned major engineering projects in Papua New Guinea. Environmental Conservation, 6(4), pp. 281–6, 7 figs.CrossRefGoogle Scholar
Richards, A. H. (in press). Decline of the Tilapia (Sarotherodon mossambicus) fishery in the Sepik River of Papua New Guinea, due to the spread of water-fern (Salvinia molesta). Papua New Guinea Agric. J.Google Scholar
Thomas, K. J. (1979). The extent of Salvinia infestation in Kerala (S. India): its impact and suggested methods of control. Environmental Conservation, 6(1), pp. 63–9, 11 figs.CrossRefGoogle Scholar
Thorp, J. P. (1979). Inland Fisheries. East Sepik Rural Development Project, Annual Report 01–12 1978: 18 pp., (cyclostyled).Google Scholar
Viner, A. B. (1979). The Status and Transport of Nutrients Through the Purari River. Purari River (Wabo) Hydroelectric Scheme Environmental Studies Vol. 9. Office of Environment and Conservation, Waigani, and Department of Minerals and Energy, Konedobu, Papua New Guinea: 52 pp., 7 figs.Google Scholar