Hydrology and Plankton of Eleiyele Reservoir Ibadan, Nigeria

Imevbore, A. M. A.

doi:10.1007/bf00135017

Cited by 57 publications

(41 citation statements)

References 16 publications

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“…However in consonance with this investigation, [15,43] reported rotifer maxima at the peak period of water level. They attributed the rainy season maxima to the dilution effect of salinity.…”

Section: Discussionsupporting

confidence: 86%

Zooplankton Community Responses in a Perturbed Tropical Stream in the Niger Delta, Nigeria~!2009-07-22~!2009-10-22~!2010-04-09~!

Arimoro¹,

Oganah²

2010

TOEBMJ

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Abstract:The effect of abattoir wastes and other anthropogenic activities on the distribution and abundance of zooplankton and environmental variables were investigated in Orogodo River, southern Nigeria. Samples of zooplankton were collected for a period of six months from three stations, representing upstream of the river course, effluent discharge point and downstream of the river course. A combined total of 79 species of zooplankton were encountered in the study. Station 1 recorded the highest number (78 species), station 2 with 22 taxa and station 3 with 72 representative taxa, showing recovery in terms of diversity and abundance of zooplankton. Rotifers of the order Bdelloidea dominated all the stations and were relatively high in station 2 indicating their tolerance to a wide range of impact. Generally, the cladocerans were abundant at all stations. However, Moina micrura, and Thermocylops neglectus were the only members of this group recorded in station 2. The low fauna diversity experienced in station 2 throughout the period of sampling showed strong evidence of impact arising from the abattoir waste discharge and heavy human activities at that station. Local environmental conditions (i.e. Temperature, flow velocity, depth, dissolved oxygen, alkalinity and conductivity) accounted for 69% of variation in zooplankton assemblages using canonical correspondence analysis (CCA). Seasonal trends in zooplankton community composition were also related to changes in environmental characteristics of the river. Our results indicate that the changing water quality status of the Orogodo River affected the zooplankton diversity and abundance and such measure could be used as a biomonitoring tool to determine the ecological health of the river.

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Section: Discussionsupporting

confidence: 86%

Zooplankton Community Responses in a Perturbed Tropical Stream in the Niger Delta, Nigeria~!2009-07-22~!2009-10-22~!2010-04-09~!

Arimoro¹,

Oganah²

2010

TOEBMJ

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“…Variation in amount and duration of rainfall had been found (Egborge, 1994) to affect physico-chemical parameters of water which in turn affects growth of aquatic organisms and production (Adebisi, 1981). Inverse relationship between transparency and rainfall agrees with findings by Imevbore (1967) and Egborge (1977), in some of Nigerian inland waters. They explained that as flooding occurred due to heavy rainfall and consequent rise in water levels, run-off from nutrient rich …”

Section: Figure 2 Variations Mensuelles Des Pluies (Cm) (A) Et Niveausupporting

confidence: 62%

“…Impacted changes in water quality as reflected in the biotic community structure, has been investigated (Boyd, 1981;Ezra and Nwankwo, 2001). Other studies on Nigerian aquatic ecosystem impairment have been reported (Imevbore, 1967;Smith and Powell, 1971;Azionu, 1983;APHA, 1987;Akpan and Offem, 1993a;Antia and Holzlohner, 1996). Recently, World Bank report noted that the problem associated with lack of quality freshwater in Nigeria threatens to place the health of about 40 million people at risk.…”

Section: Introductionmentioning

confidence: 92%

Dynamics of the limnological features and diversity of zooplankton populations of the Cross River System SE Nigeria

Offem

Samsons

Omoniyi

et al. 2009

Knowl. Managt. Aquatic Ecosyst.

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“…Darnell (1961) demonstrou que o zooplâncton do lago Pontchartrain, na Lousiana, EUA, alimentava-se, basicamente, da matéria orgânica rica em bacté-rias. Imevbore (1967), estudando o reservatório de Ibadan, na Nigéria, observou que o "pico" nas populações do zooplâncton era precedido por um pico no material particulado na água. Esse autor concluiu que o zooplâncton alimentava-se diretamente dos detritos ricos em bactérias, sendo pouco o alimento fornecido pelo fitoplâncton.…”

Section: Dataunclassified

Produção e consumo de carbono orgânico na comunidade planctônica da represa da Pampulha, Minas Gerais, Brasil

Araújo

Pinto‐Coelho

1998

Rev. Bras. Biol.

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Carbon production and consumption of the planktonic community from Pampulha Reservoir, Minas Gerais State, BrazilThe basic aim of the present investigation was related to the question: How important is the phytoplankton as a food resource for zooplankton in a tropical hypereutrophic reservoir? For answering this question, two different approaches were adopted. The first one included a regular monitoring program aimed to follow the composition and biomass of zooplankton as well as the major food resources, expressed in terms of C-biomass of sestonic particles. A second approach included the experimental determination of the balance between production and consumption of organic carbon in the planktonic community of Pampulha Reservoir. This was done through simultaneous determination of maximum potential primary production and assimilation rates of mesozooplankton estimated from respiration rates. The algal production was evaluated considering two different size fractions: a) nanno-(< 50 µm) and b) net phytoplankton (50-160 µm). The respiration of zooplankton community was restricted to larger organisms (mesozooplankton). These rates were determined at the laboratory under optimal conditions of illumination and temperature.Field data from the monitoring program showed that the limnetic zone of the reservoir supported a relatively low algal biomass for most parts of the seasonal cycle (< 30 µg.L -1 ). Except the short term algal (Microcystis spp.) blooming periods, chlorophyll-a concentrations in the water column remained at relatively low levels. The annual range of chlorophyll-a was 0-126 µg.L -1 . Furthermore, field data also indicated that the bulk of the sestonic carbon was concentrated on non-pigmented particles.Evidences from laboratory suggested that the carbon demand of zooplankton could not be supplied by primary producers from the limnetic zone alone. The potential primary production ranged from low to moderate values (2.0-37.3 mgC. m -3 h -1 ) and, as a consequence, assimilation rates of zooplankton remained higher than algal production (< 50 µm) for most parts of the year. Considering these evidences from field and laboratory, this study concludes that the energetic demand of (meso)zooplankton was, to a large extent, supplied by the detrital food chain.Key words: primary production, secondary production, particulate organic carbon, zooplankton. RESUMOO presente estudo tem por objetivo investigar a importância relativa do fitoplâncton como recurso alimentar para o zooplâncton em um reservatório hipereutrófico tropical. Para atingir esta meta, dois enfoques foram adotados. O primeiro deles consistiu num monitoramento regular (mensal) dos teores de biomassa do zooplâncton e das suas fontes de alimento expressas em termos de biomassa de carbono de partículas sestônicas. O segundo enfoque consistiu numa abordagem experimental com o objetivo

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Hydrology and Plankton of Eleiyele Reservoir Ibadan, Nigeria

Cited by 57 publications

References 16 publications

Zooplankton Community Responses in a Perturbed Tropical Stream in the Niger Delta, Nigeria~!2009-07-22~!2009-10-22~!2010-04-09~!

Zooplankton Community Responses in a Perturbed Tropical Stream in the Niger Delta, Nigeria~!2009-07-22~!2009-10-22~!2010-04-09~!

Dynamics of the limnological features and diversity of zooplankton populations of the Cross River System SE Nigeria

Produção e consumo de carbono orgânico na comunidade planctônica da represa da Pampulha, Minas Gerais, Brasil

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