Abstract
InSalvinia molesta Mitchell growth rate was uniform among the various size groups except in the proliferating floating stage in which it was faster. An average increase of about 25% weight occurred during a period of 5 days under laboratory condition. In general fresh set of leaves developed at an average interval of 4·5 days but this period may vary under different environmental conditions. In low salinities the growth of the fern showed retardation while in higher salinities it underwent complete destruction. Salinities above 7‰ was harmful for the weed while it completely withered in salinities 11‰ and above. Minimum period required for the total withering of the weed in salinities 34‰ and 11‰ were 30 min and 20 h respectively. These results are of value in the effective control of the weed by flushing them into brackish water lakes during monsoon.
Similar content being viewed by others
References
Bennet F D 1972Current status of the biological control of Salvinia in Africa; presented at the Int. Cong. of Entomol. Canberra
Blackman G E 1960Responses to environmental factors by plants in the vegetative phase in growth of living systems, ed. M X Xarrow (New York: Basic Books) pp 525–556
Bowmaker A P 1969 A study of the hydrobiology of Sinamwenda river and “ Estuary ” Lake Kariba;The Nuffield Lake Kariba Research Station Report 1962–63, pp 15–17
Gaudet J and Koh D 1968 Effect of various growth regulators onSalvinia rotundifolia in sterile culture;Bull. Torrey Bot. Club 95 92–102
Gaudet J J 1973 Growth of a floating aquatic weed,Salvinia, under standard conditions;Hydrobiologia 41 77–106
Gaudet J J 1974 Report to the Kerala State Electricity Board on the present status of the aquatic weed, African pyle (Salvinia molesta);Dept. Biol. Sciences, Kenyata University College, Nairobi
Gopal B 1976 A note on the growth and ecology ofSalvinia molesta Mitchell; inAquatic weeds in South East Asia eds C K Varshney and J RzoskaProceedings of a Regional Seminar on Noxious Aquatic Vegetation, New Delhi, 12, 17 December 1973
Kam Wing L and Furtado J I 1977 The chemical control ofSalvinia molesta Mitchell and some related toxicological studies;Hydrobiologia 56 49–62
Mitchell D 1970The autecology of Salvinia auriculata on Lake Kariba; Ph.D. Thesis; Univ. London, London
Mitchell D S 1960 Report on incidence ofSalvinia auriculata on Lake Kariba;Fed. Sci. Teacher’s J. 1 39–46
Mitchell D S 1963 The biological explosion ofSalvinia auriculata on Lake Kariba; Cyclostyled paper read at the 1963Conference of the South African Inst tute of Sewage Purification in Salisbury
Mitchell D S 1965 Research onSalvinia auriculata;Lake Kariba Fish. Res. Inst. Symp.,Kariba Turn, 1965
Mitchell D S 1967Salvinia auriculata in the Estuaries of Lake Kariba;Abstr. Proc. 1stRhod. Sci. Congr. p. 64
Mitchell D S 1969 The ecology of vascular hydrophytes on Lake Kariba;Hydrobiologia 34 448–464
Mitchell D S 1976 The growth and management ofEichhornia crassipes andSalvinia spp. in their native environment and in alien situations; inAquatic weeds in South East Asia eds C K Varshney and J RzoskaProceedings of a Regional Seminar on Noxious Aquatic Vegetation, New Delhi 12–17 December 1973
Samuel S, Mathew K and Antony 1975 Observations on the African weed,Salvinia auriculata Aublet with special reference to salinity tolerance;Bull. Dept. Mar. Sci. Univ. Cochin 7 913–917
Schelpe E A C L E 1961 The ecology ofSalvinia auriculata and associated vegetation of Kariba Lake;J. S. Afr. Bot. 27 181–187
Thomas K J 1975 Biological control ofSalvinia by the snailPila gl obosa. Swainson;Biol. J. Linn. Soc. 7 243–247
Zurshi D P 1968Ecology of some Kashmier lakes; Ph.D. thesis, Jammu and Kashmir University, Srinagar
Zutshi D P and Vass K K 1971 Ecology and production ofSalvinia natans in Kashmir;Hydrobiologia 38 303–320
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Divakaran, O., Arunachalam, M. & Nair, N.B. Growth rates ofSalvinia molesta Mitchell with special reference to salinity. Proc. Indian Acad. Sci. 89, 161–168 (1980). https://doi.org/10.1007/BF03046199
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF03046199