Distribution, abundance and diversity of macrozoobenthos in Aiba Reservoir, Iwo, Nigeria

Atobatele, O. E.; Ugwumba, O. A.

doi:10.2989/16085914.2010.543121

Cited by 12 publications

(12 citation statements)

References 12 publications

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“…Only a few studies of this type have been conducted, most of them descriptive (Timms, 1979;McLachlan andMcLachlan, 1971, Sibaja-Cordero andUmaña-Villalobos, 2008) while others considering only the shallow, littoral areas of deep lakes (Tudorancea and Harrison, 1988). However, the few studies conducted in deep tropical lakes show low densities of zoobenthos; this seems to be a common phenomenon of deep tropical lakes, a characteristic that is in sharp contrast to the high densities recorded in the northern deep temperate lakes (Atobatele and Ugwumba, 2010 ) of profundal benthic invertebrates in Lake Alchichica were low compared to the results of a similar study of the temperate and sub-arctic lakes Esrom, Mývatn and Thingvallavatn: the density and biomass in these lakes reached 200,000 ind·m -2 and 5.3 g C m -2 , respectively (Jónasson et al, 1990). Moreover, the density (874,829 ind m -2 ) and biomass (1745.6 mg C m -2 ) of the zoobenthos of Alchichica's littoral area are 731 and 108 times higher, respectively, than the same variables in the deep zone of the lake (Alcocer, 1995;Hernán-dez, 2001).…”

Section: Species Richness and Densitymentioning

confidence: 99%

“…The great mobility of chironomids enables them to recolonize sites suitable for larval development and to rebuild their numbers quickly (Atobatele and Ugwumba, 2010). The juvenile chironomids move to the deep zone in search of food when there is DO available, which occurs during the circulation period (Cleto-Filho and Arcifa, 2006).…”

Section: Adaptation To Profundal Life In Alchichicamentioning

confidence: 99%

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Profundal benthic invertebrates in an oligotrophic tropical lake: different strategies for coping with anoxia

et al. 2014

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Section: Species Richness and Densitymentioning

confidence: 99%

Section: Adaptation To Profundal Life In Alchichicamentioning

confidence: 99%

Profundal benthic invertebrates in an oligotrophic tropical lake: different strategies for coping with anoxia

et al. 2014

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“…The significance of headwater streams in freshwater systems cannot be overemphasized but is unfortunately often ignored in limnological studies. For instance, Aiba Reservoir has been copiously studied (e.g., [6,15,16]) but with little or no attention on its adjacent streams. Not until recently were studies carried out in the downstream section of the reservoir [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Water Physicochemistry and Zooplankton Fauna of Aiba Reservoir Headwater Streams, Iwo, Nigeria

Akindele

Olutona

2014

Journal of Ecosystems

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The physicochemical water condition and zooplankton fauna of the two main inflows of Aiba Reservoir were assessed over an annual hydrological cycle (May 2013-March 2014. The concentrations of total solids (TS) and total suspended solids (TSS) in the two streams were unusually higher in the dry season for typical inland waters of Nigeria and showed a decrease from the upper reaches towards the lower reaches (reservoir's inlet). Dissolved oxygen, NO 3 − , and PO 4 3− recorded their highest concentrations at the reservoir's inlet. A total of 37 species of zooplankton were recorded in the study, comprising 5 species of Protozoa, 14 species of Rotifera, 10 species of Copepoda, 4 species of Ostracoda, and 4 species of Insecta. Aiba stream recorded higher number of zooplankton species and abundance than Onikan stream. While number of zooplankton species and abundance showed an increase from the upper reaches to the lower reaches of both streams, species diversity and equitability generally showed a decrease. Correlation and regression analysis suggests that the concentration of TS and TSS played a major role in determining the zooplankton community structure of the streams. PO 4 3− concentrations as well as the community structures of zooplankton faunas of the two streams were indicative of a polluted freshwater system with unstable habitat structure.

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“…A detailed account of the characteristics of Aiba Reservoir has been given by Atobatele and Ugwumba (2010). Location A is North-east of the reservoir, near source of inflow (upstream) with little human activity such as occasional washing/bathing ( Figure 1); Location B is South-east and drains land used as forest reserve and for agricultural activities; Location C is North of the reservoir and drains an area with rapid residential and occupational encroachment; while Location D is South of the reservoir, close to outflow (downstream) with high human activity such as swimming, bathing, domestic washing and removal of fish intestines.…”

Section: Methodsmentioning

confidence: 99%

Distribution of Arsenic (As) in Water, Sediment and Fish from a Shallow Tropical Reservoir (Aiba Reservoir, Iwo, Nigeria)

Atobatele¹,

Olutona²

2015

Journal of Applied Sciences and Environmental Management

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ABSTRACT:The status of arsenic in Aiba Reservoir, Iwo, Nigeria was assessed to determine its levels and distribution in water, sediment and tissues of fish. Total arsenic was estimated by atomic absorption spectrophotometry. The mean levels detected for reservoir water (1.50 ± 0.22ppb) and sediment (2.00 ± 0.17ppb) were below the World Health Organization recommended limit of 0.01mg/L (10ppb) for drinking water. Arsenic in sediments significantly followed (r = 0.588, p = 0.002, n = 24) the level of contamination of water. The distribution of arsenic in reservoir water shows significant spatial and temporal heterogeneity; while that for sediment shows temporal homogeneity. Mean As levels for fish kidney (15.72 ± 4.14ppb) and liver (12.04 ± 2.73ppb) were significantly higher than levels for fish gills (2.03 ± 0.34ppb) and muscle (1.46 ± 0.13ppb). The first and second Canonical Variate showed 49.82% and 34.75% between-species variation respectively. This report suggests that fish at the lower level of the food web have higher levels of As compared to those at a higher trophic status. The current low levels of arsenic in the abiotic component of the reservoir suggest that contamination is mainly from anthropogenic rather than from natural sources. This report suggests seasonal, municipal and agricultural sources of arsenic contamination of Aiba Reservoir. ©JASEM http://dx

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Distribution, abundance and diversity of macrozoobenthos in Aiba Reservoir, Iwo, Nigeria

Cited by 12 publications

References 12 publications

Profundal benthic invertebrates in an oligotrophic tropical lake: different strategies for coping with anoxia

Profundal benthic invertebrates in an oligotrophic tropical lake: different strategies for coping with anoxia

Water Physicochemistry and Zooplankton Fauna of Aiba Reservoir Headwater Streams, Iwo, Nigeria

Distribution of Arsenic (As) in Water, Sediment and Fish from a Shallow Tropical Reservoir (Aiba Reservoir, Iwo, Nigeria)

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