Benthic macrofauna community composition, abundance and distribution in the Tanzanian and Ugandan inshore and offshore waters of Lake Victoria

Ngupula, GW; Kayanda, Robert

doi:10.2989/16085914.2010.490978

Cited by 25 publications

(15 citation statements)

References 10 publications

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“…The zooplankton community is currently dominated by small sized cyclopoids contrasting the past situation where large sized calanoids and cladocerans dominated (Mavuti and Litterick, 1991;Mwebaza-Ndawula, 1994;Gophen et al, 1995;. Benthic macroinvertebrates have increased in abundance and is dominated by gastropods and bivalves in favour of the insects and worms (Mbahinzireki, 1994;Muli and Mavuti, 2001;Ngupula and Kayanda, 2010). Possibly, the observed impacts have magnified to the vertebrates' composition and abundance too.…”

Section: Introductionmentioning

confidence: 99%

How Does Increased Eutrophication and Pollution in the Lake Victoria Waters Impacts Zooplankton?

Ngupula

2014

JEE

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To understand how eutrophication and pollution impacts zooplankton in the Lake Victoria waters, zooplankton samples were collected during a 21 days survey conducted from 6 th to 27 th May, 2013 constituting a total of 71 sampling stations. A net of 60 μm nitex mesh was used for the purpose. The lake waters were categorized into six ecological zones with the understanding that, inshore waters are the most highly impacted as compared to nearby and far offshore. Comparing to the data collected in 2007, it can be concluded that zooplankton have decreased in abundance. The inshore waters indicated the highest abundance contrasting the far offshore. Cyclopoids dominated other zooplankton by 73% and were evenly distributed in all the waters while calanoids (18%) increased towards offshore locations. Rotifers were the least in abundance (4%), after cladocerans (5%) and were confined in the inshore waters. In regards to the fact that calanoids and cladocerans dominated the Victoria waters during 1930s and the fact that predation forces from zooplantivores fish (like Rastrineobola argentea Pellegrin 1904 (dagaa), haplochromines, and juveniles of Nile perch (Lates niloticus, L.)) are not responsible for the reversed situation, then the findings imply that increased eutrophication and pollution impacts the lake zooplankton by favouring the increase of cyclopoids and some species of rotifers while limiting the calanoids and cladocerans to mainly offshore locations. The current observed low abundance of zooplankton does not threaten the pelagic fishery of the lake.

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Section: Introductionmentioning

confidence: 99%

How Does Increased Eutrophication and Pollution in the Lake Victoria Waters Impacts Zooplankton?

Ngupula

2014

JEE

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“…Such adoption signals the growing interest and recent need for the use of macroinvertebrates based indices in the tropics to assess streams and river health status. Unfortunately, recorded macroinvertebrates in temperate, Mediterranean, arid, and semiarid regions did not sufficiently 2 Journal of Ecosystems match with those in the tropics to confirm the existence of general adopting rules among macroinvertebrates based indices from other regions [11][12][13][14]. Besides, differences in climate and altitude, combined with the longitudinal position of sites, appear to be important factors governing diversity and structure of macroinvertebrate communities among regions [11,15,16].…”

Section: Introductionmentioning

confidence: 99%

Study on Freshwater Macroinvertebrates of Some Tanzanian Rivers as a Basis for Developing Biomonitoring Index for Assessing Pollution in Tropical African Regions

Elias

Ijumba

Mgaya

et al. 2014

Journal of Ecosystems

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Macroinvertebrates and physicochemical parameters were assessed at 15 sites along five rivers in Kilimanjaro region, Tanzania, with the aim of understanding their ecological status and setting a base to the development of a biological index for tropical regions. Investigated rivers that occur within Pangani basin include Karanga, Rau, Lumbanga, Sere, and Umbwe. Sampling sites were categorized according to the level of water and habitat quality as follows: reference or least impacted (4 sites), moderately impacted (5 sites), and highly impacted (6 sites) sites. A total of 12,527 macroinvertebrates belonging to 13 orders and 48 families were recorded. The highest total abundance of 4,110 individuals per m 2 was found in Karanga river, while Umbwe river had the lowest with 1,203 individuals per m 2 . Chironomidae was the most abundant family (2,588 individuals per m 2 ) and the least were Hydridae and Thiaridae, each having 5 individuals per m 2 . High numbers of taxa were noted among the orders: Ephemeroptera (8), Odonata (8), Diptera (7), and Trichoptera (6). In conclusion, orders with greater diversity of macroinvertebrate families offer a wide range of tolerance to pollution and, thus can potentially be used to develop a biomonitoring index for evaluating pollution in tropical African rivers.

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“…The acidity of the lake in October would be linked to the nature of the water it receives from these tributaries. Indeed, the water from the Oueme River and the Sô river crossed land and agricultural land and received effluent that enriched them in different minerals and materials whose decomposition has increased the activity of bacteria and acidify the water [7] [26] [40] [48] [49]. Basic pH obtained at the Stations 5, 6 and 7 would be due to salinity in these stations because salt water usually have a higher pH [50].…”

Section: Water Quality Status Of Nokoue Lakementioning

confidence: 99%

Can Macroinvertebrate Assemblage Changes Be Used as Biological Indicator of Water Quality of the Nokoue Lake (Benin)?

Odountan¹,

Abou²

2015

JEP

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Investigations on biological capacity of water quality of macroinvertebrate community are very uncommon, and such as the amount of information available on the Nokoue Lake (the largest lake of Benin) is very limited. This information gap needs to be filled for better management of the Nokoue Lake. The goal of this study was to evaluate the possibility of using the macroinvertebrate community structures in Nokoue Lake and the environmental factors responsible for the maintenance of these structures. Nokoue Lake was studied over three months, during high flood period in which time subsurface water and macroinvertebrate samples were collected and analyzed. A study showed that the macroinvertebrate assemblages was done according to ecological gradients as pH, conductivity, TDS, salinity, chlorophyll a and probably to anthropogenic actions (nutriments). Better than the percentage of insects, the percentage of Chironomidae informed very well about macroinvertebrate assemblages. To assess the biological health of the environment, the Family Biotic Index (FBI) turns out to be more appropriate than diversity indices that do not take into account the intermediate pollution. Organic pollution revealed by the FBI probably affects the aquatic life.

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Benthic macrofauna community composition, abundance and distribution in the Tanzanian and Ugandan inshore and offshore waters of Lake Victoria

Cited by 25 publications

References 10 publications

How Does Increased Eutrophication and Pollution in the Lake Victoria Waters Impacts Zooplankton?

How Does Increased Eutrophication and Pollution in the Lake Victoria Waters Impacts Zooplankton?

Study on Freshwater Macroinvertebrates of Some Tanzanian Rivers as a Basis for Developing Biomonitoring Index for Assessing Pollution in Tropical African Regions

Can Macroinvertebrate Assemblage Changes Be Used as Biological Indicator of Water Quality of the Nokoue Lake (Benin)?

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