Nilotic Lakes of the Western Rift

Green, Jim

doi:10.1007/978-1-4020-9726-3_14

Cited by 13 publications

(15 citation statements)

References 44 publications

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“…The current study reports the presence a higher variability of zooplankton in the Kigezi water bodies. Our results differed from the previous studies by Green (1965aGreen ( , 1976Green ( , 2009 who reported only one copepod species; Thermocyclops oblongatus. Green, 1965a reported that T. oblongatus dominated Lakes Bunyonyi, Mutanda and Mulehe, however, this copepod species was not reported in the current study.…”

Section: Discussioncontrasting

confidence: 99%

Status of Kigezi minor Lakes: A limnological survey in the Lakes of Kisoro, Kabale and Rukungiri Districts

Tibihika¹,

Okello²,

Barekye³

et al. 2016

Int. J. Water Res. Environ. Eng.

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A limnological survey was conducted in six Lakes: Mulehe, Mutanda, Kayumbu, Chahafi, Bunyonyi and Nakasanda, of South-Western Uganda (SWU) in September 2014. The baseline survey aimed at characterizing the high altitude water bodies for enhanced future fisheries productivity. The results indicated that Lake Nakasanda had the highest temperature (24°C). Although other physic-chemical conditions of the water bodies varied, they were within acceptable ranges for fish productivity with no extreme cases reported. Chlorophyll-a was recorded highest in Lakes Nakasanda (16.8±3.4 µgL -1 ) and Bunyonyi (14.2±9.5 µgL -1 ). Rotifers were the most dominant zooplankton taxa with a total of 16 species and Lake Mulehe had the highest abundance (2,089,423±4,511 individuals m -2 ) while the least abundance were recorded in Lakes Nakasanda (471,608±35,505 individuals m -2 ) and Chahafi (473,354±15,279 individuals m -2). Among the macro-invertebrates, Diptera was the most abundant with Lake Mutanda recording the highest species richness of 8. The recorded absence or fewer individuals of some zooplankton and macro-invertebrate species/groups in certain aquatic ecosystems were attributed to the water quality. The variation in water quality, results from human activities and this may impart negative implications on fish productivity if not remedied.

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Section: Discussioncontrasting

confidence: 99%

Status of Kigezi minor Lakes: A limnological survey in the Lakes of Kisoro, Kabale and Rukungiri Districts

Tibihika¹,

Okello²,

Barekye³

et al. 2016

Int. J. Water Res. Environ. Eng.

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“…L. Victoria and lakes Kyoga and Albert link via River Nile; L. George is associated to L. Edward via a large flowing water mass, Kazinga Channel and L. Edward to L. Albert through River Semliki (Green 2009;Byrnes 2010;Cockerton et al 2013), (also see Fig. 1).…”

Section: Study Areas/locationsmentioning

confidence: 99%

“…From the South-Western Ugandan High Altitude Lakes (satellites), Mulehe and Kayumbu (Table 1; Fig. 1), Kayumbu seems not to have any outlet but L. Mulehe connects to another satellite, L. Mutanda in the south via Mucha (a small river) which links via River Kaku to L. Edward (Green 2009;Tibihika et al 2016). Nile tilapia (ISSION 1960;Green 2009), with some reports from the Local Government archives indicating restocking continued up to the 80s.…”

Section: Study Areas/locationsmentioning

confidence: 99%

“…1), Kayumbu seems not to have any outlet but L. Mulehe connects to another satellite, L. Mutanda in the south via Mucha (a small river) which links via River Kaku to L. Edward (Green 2009;Tibihika et al 2016). Nile tilapia (ISSION 1960;Green 2009), with some reports from the Local Government archives indicating restocking continued up to the 80s. L. Turkana (previously called Rudolf), located in the Great Eastern Rift Valley is the largest freshwater body in Kenya (Kolding 1992).…”

Section: Study Areas/locationsmentioning

confidence: 99%

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Anthropogenic impacts on the contextual morphological diversification and adaptation of Nile tilapia (Oreochromis niloticus, L. 1758) in East Africa

et al. 2018

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Nile tilapia occurs naturally in East Africa where it's an economically important species. Many of the natural populations of Nile tilapia have been affected by anthropogenic activities including translocations, associated with programmes aimed at enhancing capture fisheries and aquaculture productivity. Using geometric morphometric analyses, we tested the hypothesis that such anthropogenic activities have augmented admixture among natural populations of Nile tilapia and influenced the geographical distribution of morphological variation within the species. Our expectation was that Nile tilapia shape divergent might be consistent with reportedly anthropogenic activities in nonnative environments. To test this hypothesis, we analyzed the shapes of 490 individuals from thirteen populations; three farms, six natives and four nonnative natural populations. Our analysis revealed that the most pronounced shape diversification was observed in seven populations; three nonnatives (Victoria, Kyoga and Sindi farm) and four natives (Albert, River Nile, George and Turkana). The features responsible for the observed morphotypes were mainly related to the orientation of the anterior region of the fish and may be due to diversifying selection in response to new environmental pressures (for nonnative populations), admixture or drift. Shape change in the nonnative high-altitude populations was unexpectedly conserved, suggesting recent introductions which may have not resulted in admixture or there was strong selection against change in the traits measured. On the other hand, the recorded morphotypic clusters explained the possible genetic link to their putative ancestral home. Our results were partially consistent with our prediction that the nonnative populations exhibited divergent morphotypes. We recommend further investigations with molecular genetics for followup of these findings.

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“…The nearby lakes in the Kigezi highlands, Lakes Mulehe and Bunyonyi, have only recently had Microcystis as a dominant in their phytoplankton (Green, 2009), but they both have Keratella tropica and Brachionus angularis as their top two most The relationship between the dominance modified similarity index of rotifers associated with Microcystis blooms, and latitudinal difference from Lake George. Line B, from Green (1972), compares the planktonic rotifer associations in nine localities with the rotifers of Lake Albert, Uganda, using total lists of species frequent planktonic rotifers, and they have very high similarity indices.…”

Section: Discussionmentioning

confidence: 98%

Geographical variation in rotifers associated with Microcystis blooms

Green

2010

Hydrobiologia

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Lake George, Uganda, lies on the equator and shows little variation in temperature or in the dominance of Microcystis in the phytoplankton. The dominant planktonic rotifers in Lake George are compared to those found in lakes in other parts of the world, ranging from tropical and subtropical lakes with semi-permanent blooms of Microcystis to temperate localities with summer blooms or less regular blooms at multiannual intervals. A modified Sorensen Similarity Index is used to show a latitudinal gradient in the rotifers associated with Microcystis.

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Nilotic Lakes of the Western Rift

Cited by 13 publications

References 44 publications

Status of Kigezi minor Lakes: A limnological survey in the Lakes of Kisoro, Kabale and Rukungiri Districts

Status of Kigezi minor Lakes: A limnological survey in the Lakes of Kisoro, Kabale and Rukungiri Districts

Anthropogenic impacts on the contextual morphological diversification and adaptation of Nile tilapia (Oreochromis niloticus, L. 1758) in East Africa

Geographical variation in rotifers associated with Microcystis blooms

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