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MASTER THESIS
Academic year:
2002
Course title
:
Diploma / M.Phil. in Fisheries Biology and Fisheries Management
BIBLIOGRAPHY FOR DISTRIBUTION ON WEB:
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Mandatory
Surname
:
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Songore
First name
:
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Newman
Gender
:
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-Select-
University degree:
M.Phil.
Year of graduation:
2002
Nationality
Zimbabwe
Thesis title
*
:
Fish diversity devlopment in Lake Kariba, Zimbabwe, from 1960 to 2001
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560 - Marine and Freshwater Biology
Abstract
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:
(maximum 450 words)
The objectives of this study were to describe the fish species diversity changes over the four-decade period the man made Lake Kariba has been in existence and to relate the observed changes to biotic and abiotic factors in order to possibly understand the mechanisms behind the dynamics. The findings are compared with earlier predictions and theoretical attributes for the measuring ecological succession and stability.
Time series data, covering the period 1960 to 2001, which is included experimental gill net, hydrological and air temperature data were used in this study.
Succession in Lake Kariba with regards to fish diversity apparantly took approximately three decades to finalize. While certain fish species disappeared from the lake basin itself already at an early stage, many more species have become established, some of which have been introduced by man. The general notion that man-made reservoirs may reduce species diversity seems not to hold for the fish community in Lake Kariba.
Diversity changes in Lake Kariba are significantly negatively correlated to mean annual lake level changes and the abundance predator of Hydrocynus vittatus and these can be regarded as disturbing agents of the system that play a regulatory factor.
According to some of the ecological attributes put forward as indicators of maturity of a system, the Lake Kariba system with regards to fish species diversity is now a maturing system.
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Registered by: Berit Reidun Øglænd. Last saved: 13.02.2003 13:00:04.