The decline of water hyacinth on Lake Victoria was due to biological control by Neochetina spp.

Wilson, J.R.U. and Ajuonub, O. and Center, R.D. and Hill, M.P. and Julien, M.H. and Katagira, F.F. and Neuenschwander, P. and Njoka, S.W. and Ogwang, J. and Reeder, R.H. and Van, T. (2007) The decline of water hyacinth on Lake Victoria was due to biological control by Neochetina spp. Aquatic botany, 87 (1). pp. 90-93. ISSN 0304-3770

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Official URL: http://dx.doi.org/10.1016/j.aquabot.2006.06.006

Abstract

There has been some debate recently about the cause of the decline of water hyacinth on Lake Victoria. While much of this evidence points to classical biological control as the major factor, the El Niño associated weather pattern of the last quarter of 1997 and the first half of 1998 has confused the issue. We argue first that the reductions in water hyacinth on Lake Victoria were ultimately caused by the widespread and significant damage to plants by Neochetina spp., although this process was increased by the stormy weather associated with the El Niño event; second that increased waves and current on Lake Victoria caused by El Niño redistributed water hyacinth plants around the lake; and third that a major lake-wide resurgence of water hyacinth plants on Lake Victoria has not occurred and will not occur unless the weevil populations are disrupted. We conclude that the population crash of water hyacinth on Lake Victoria would not have occurred in the absence of the weevils, but that it may have been hastened by stormy weather associated with the El Niño event.

Item Type:Article
Additional Information:Short Communication
Uncontrolled Keywords:Eichhornia crassipes;, Neochetina bruchi, Neochetina eichhorniae, water hyacinth, Lake Victoria
Subjects:Y Unknown > Subjects to be assigned
Divisions:Faculty > Faculty of Science > Zoology & Entomology
ID Code:477
Deposited By: Mrs Eileen Shepherd
Deposited On:05 Jun 2007
Last Modified:06 Jan 2012 16:18
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