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Aquatic assessment in the Lake Tumba landscape, DRCongo

fish diversity and conservation

Mputu, Adèle (2013). Aquatic assessment in the Lake Tumba landscape, DRCongo. Uppsala : Sveriges lantbruksuniv. ; 2013
ISBN 978-91-576-9132-3
[Licentiate thesis]

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Abstract

The 80,000 km² Lake Tumba Landscape (LTL) is the only one of the 12 UN Priority
Conservation Areas in Africa with a focus on freshwater ecosystems. Surprisingly little
though is known about fish in this area. The objective of this thesis is to increase
knowledge of fish occurrence in the LTL.

The first paper uses catch statistics to quantify the fish populations in three LTL
streams against the background of their physical and chemical environments (Paper I).
All the species caught represented 23% of the known Congo Basin fish species. The
Lebomo stream had higher catches during the dry than wet season, but this was not the
case for the Bambou and Bongo streams. Significant differences in fish species
composition between the streams were found, but this probably related more to pH and
nutrient status than land use. These streams yield too little fish to be a regular part of
the local diet, but the streams may be important reservoirs of biodiversity in the
landscape, and also serve as ”sentinels” of change for larger downstream aquatic
ecosystems.

The aim of the second paper was to characterize the breeding sites of Tilapia congica
in order to guide the zoning process for fishery management in Lake Tumba. For this
purpose, the nest depths, distances from the shoreline, exposure to sunlight and habitat
types were measured. Four extensive groups of breeding sites were located near where
tributary rivers entered the lake. All nest sites were exposed to the sun and 90% of sites
were within 51-250m of the shoreline. The breeding substrates for T. congica are sandy
and under hippo grass (Vossia cuspidata) (48%) or water lilies (Nymphaea stellata)
(39%). Tilapia congica shared 42% of its nesting sites with other fish species, so
protecting the breeding habitat of T. congica would likely help other species.

The major overall findings of this thesis are that there is much diversity in the
running waters of the LTL, and that knowledge of the location as well as the
seasonality of fish breeding patterns can inform better fish management. At this point,
it is not clear what effect land use/land cover has on the fishery, but better monitoring
can establish a baseline against which eventual changes can be defined in relation to
changes in land use and even climate.

Authors/Creators:Mputu, Adèle
Title:Aquatic assessment in the Lake Tumba landscape, DRCongo
Subtitle:fish diversity and conservation
Alternative abstract:
LanguageAbstract
EnglishUNSPECIFIED
Year of publishing :6 May 2013
Volume:2013
Number of Pages:40
Papers/manuscripts:
NumberReferences
I.Mputu, D.A., Willén, E., Bishop, K., Wilander, A., Inogwabini, B.I. (2013). Fish populations and catch statistics in running waters of the Lake Tumba Landscape, DR Congo 2007–2011 (manuscript).
II.Inogwabini, B.I., Mputu, D.A., and Zanga, L. (2009). The use of breeding sites of Tilapia congica (Yhys & van Audenaerde 1960) to delineate conservation sites in the Lake Tumba, Democratic Republic of Congo: toward the conservation of the lake ecosystem. African Journal of Ecology 48(3), 800-806, doi: 10.1111/j.1365-2028.2009.01180.x.
Place of Publication:Uppsala
Publisher:Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
ISBN for printed version:978-91-576-9132-3
Language:English
Publication Type:Licentiate thesis
Full Text Status:Public
Agris subject categories.:M Aquatic sciences and fisheries > M01 Fisheries and aquaculture - General aspects
M Aquatic sciences and fisheries > M40 Aquatic ecology
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Fish and Aquacultural Science
Agrovoc terms:lakes, rivers, aquatic communities, tilapia congica, animal population, population structure, freshwater ecology, biodiversity, democratic republic of the congo
Keywords:streams, fish community composition, lake tumba, breeding sites, lake tumba landscape, DRC, fish community structure
URN:NBN:urn:nbn:se:slu:epsilon-e-1452
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-1452
ID Code:10436
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
External funders:Swedish Institute
Deposited By: Adѐle Mputu
Deposited On:13 May 2013 10:47
Metadata Last Modified:04 Mar 2015 13:50

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