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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Has climate change disrupted stratification patterns in Lake Victoria, East Africa?
African Journal of Aquatic Science, Volume 38, No. 3, Year 2013
Notification
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Description
Climate change may threaten the fisheries of Lake Victoria by increasing density differentials in the water column, thereby strengthening stratification and increasing the intensity and duration of deoxygenation in the deeper waters. Between 1927 and 2008 the lake's temperature increased by 0.99 °C at the surface and by 1.34 °C at depths >50 m, with the rate of warming increasing most rapidly between 2000 and 2008. In February 2000 there were marked thermal discontinuities in the water column at a number of deep stations, with marked oxyclines at depths ranging from 30-50 m, and with all stations being anoxic from 50 m downwards. In contrast, in February 2007 the lake's temperature had risen, especially at the bottom, and both the thermal discontinuities and oxyclines were much reduced, only one station recording a dissolved oxygen concentration of <2.0 mg l-1 at 50 m. This may reflect the fact that deeper waters were warming faster, and the reasons for this are discussed. These data suggest that the impacts of warming on the thermal regime of African lakes may be highly variable and unpredictable and, in this case, may have reduced its threat to the fisheries. © 2013 Copyright © NISC (Pty) Ltd.
Authors & Co-Authors
Marshall, Brian E.
Uganda, Jinja
Lake Victoria Fisheries Organization
New Zealand, Auckland
Not Available
Ezekiel, Charles Nyarongo
Tanzania, Dar es Salaam
Tanzania Fisheries Research Institute Tafiri
Gichuki, John Wageni
Kenya, Kisumu
Kenya Marine and Freshwater Fisheries Institute
Mkumbo, Oliva C.
Uganda, Jinja
Lake Victoria Fisheries Organization
Sitoki, Lewis M.
Kenya, Kisumu
Kenya Marine and Freshwater Fisheries Institute
Wanda, Fred M.
Uganda, Jinja
National Fisheries Resources Research Institute
Statistics
Citations: 33
Authors: 6
Affiliations: 5
Identifiers
Doi:
10.2989/16085914.2013.810140
ISSN:
16085914
Research Areas
Environmental
Study Locations
Multi-countries