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To connect or not to connect?: floods, fisheries and livelihoods in the Lower Rufiji floodplain lakes, Tanzania

Hamerlynck, Olivier; Duvail, Stephanie; Vandepitte, Leen; Kindinda, Kassim; Nyingi, Dorothy W.; Paul, Jean-Luc; Yanda, Pius Z.; Mwakalinga, Aggrey B.; Mgaya, Yunus D.; Snoeks, Jos. 2011 To connect or not to connect?: floods, fisheries and livelihoods in the Lower Rufiji floodplain lakes, Tanzania. Hydrological Sciences Journal, 56 (8). 1436-1451. 10.1080/02626667.2011.630002

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Abstract/Summary

For seven years, village-based recorders monitored fish catches and water levels in seven floodplainassociated lakes of the Lower Rufiji, Tanzania. The lakes differ in the number of days and volume of inflows from the river, and thus provide a natural experiment to explore the links between catch composition, income per hour of fishing (IPHF) and hydrological connectivity, and to analyse the response of the users. The fishers adapt their fishing mode and equipment to achieve a rather constant IPHF of between 0.2 and 0.8 US$/fisher/hour. In situations of low connectivity, during a series of drought years, the less well-connected lakes lost many species and became a virtual monoculture of Oreochromis urolepis. Only in one extreme case was average fish size significantly reduced, indicating a high fishing pressure. Catch was therefore highly resilient to shifts toward illegal, non-selective and active fishing techniques. Fish diversity and lake productivity were quickly re-established when the larger lakes reconnected. The potential impacts of changes in the flood hydrograph (through dams, increased abstraction or climate/land-use changes) are assessed, and management options discussed.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1080/02626667.2011.630002
Programmes: CEH Topics & Objectives 2009 onwards > Water > WA Topic 2 - Ecohydrological Processes > WA - 2.3 - Assess the responses of river, lake and wetland ecosystems to ecohydrological drivers
CEH Sections: Acreman
ISSN: 0262-6667
Additional Keywords: floods, floodplains, tropical fisheries, ecosystem services, livelihoods, participatory monitoring
NORA Subject Terms: Ecology and Environment
Hydrology
Date made live: 05 Jan 2012 14:38
URI: http://nora.nerc.ac.uk/id/eprint/16238

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