Macroinvertebrate community of a post lindane treated stream flowing through derived savannah in southern Nigeria

Olomukoro, John Ovie; Dirisu, Abdul-Rahman

doi:10.4314/tfb.v21i1.6

Cited by 7 publications

(11 citation statements)

References 4 publications

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“…Detailed descriptions of this locality have been previously published [10][11][12]. A descriptive summary of the sampling stations, type of water body, coordinates and sediment types is presented in Table 1.…”

Section: Description Of the Study Areamentioning

confidence: 99%

Physico-chemical trends in the sediments of Agbede Wetlands, Nigeria

Dirisu

Olomukoro

Ezenwa

2017

Materials and Geoenvironment

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This study assessed the physico-chemical status of sediments in the Agbede Wetlands with the aim to create a reference archive for the Edo North catchment and to further identify the characteristics mostly influenced by the natural and anthropogenic activities going on at the watershed. Nutrients, zinc, nickel and lead were identified to be mostly of anthropogenic origin, while alkali metals and alkaline earth metals were from both anthropogenic and natural sources. The clustering of stations 1 and 4 indicates that the sediment quality in the lentic systems was not completely excluded from the lotic system, suggesting that principal component analysis (PCA) and cluster analysis (CA) techniques are invaluable tools for identifying factors influencing the sediment quality. The mean values of the particle size distribution were in the following order across the ecosystems: sand (61.86-80.53%) > silt (9.75-30.34%) > clay (7.83-13.89%). The contamination of the water bodies was primarily derived from agricultural run-offs and through geochemical weathering of the top soils. Therefore, our analysis indicates that the concentrations of cations, anions and nutrients in the sediments of the lotic and lentic ecosystems in Agbede Wetlands are not at an alarming level. PovzetekRaziskava obravnava fizikalnokemično stanje sedimentov v agbedskih mokriščih z namenom izdelati primerjalni arhiv severnega dela porečja Eda in natančneje opredeliti njegove značilnosti, na katere vplivajo naravni in antropogeni procesi v porečju. Ugotovili so, da so hranila, cink, nikelj in svinec pretežno antropogenega porekla, alkalne in zemeljskoalkalne kovine pa iz naravnih in antropogenih virov. Lega postaj 1 in 4 v razvrščevalnem diagramu nakazuje, da kakovost sedimenta v lentičnih sistemih ni povsem izključena iz lotičnega sistema, iz česar sledi, da so metode PCA in CA (metoda glavnih komponent in metoda razvrščanja v skupine) zelo uporabne za prepoznavanje faktorjev, ki odločajo o kakovosti sedimenta. Srednje vrednosti porazdelitve zrnavosti v ekosistemih so naslednje: pesek (61.86-80.53%), > melj (9.75-30.34%), > glina (7.83-13.89%). Viri onesnaženja vodnih teles so predvsem v izpiranju obdelovalne zemlje in geokemičnem preperevanju vrhnjih tal. Iz opravljene raziskave sledi, da ugotovljene koncentracije kationov, anionov in hranil v sedimentih lotičnih in lentičnih ekosistemov v agbedskih mokriščih niso kritične.

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Section: Description Of the Study Areamentioning

confidence: 99%

Physico-chemical trends in the sediments of Agbede Wetlands, Nigeria

Dirisu

Olomukoro

Ezenwa

2017

Materials and Geoenvironment

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“…At each sampling station composite water samples for physical and chemical analyses were collected from the sub-surface into appropriate sample containers and preserved as appropriate for laboratory analysis according to standard procedures (APHA, 2005). Air and water temperatures were measured in-situ using mercury -in -glass thermometer calibrated from 0 -100 º C (Krisson model-59) (Olomukoro & Dirisu, 2012). Air temperature was usually measured before that of water at each station.…”

Section: Sampling Techniques and Samples Analysesmentioning

confidence: 99%

“…Air temperature was usually measured before that of water at each station. The floatation method earlier used by Olomukoro and Dirisu (2012) was adopted to determine the velocity of flow and the current was calculated in meters per seconds (ms -1 ). The water level at specific points in the study stations were measured using a straight stick; which was actually measured using a field tape calibrated in meters (Ogbeibu & Victor, 1995).…”

Section: Sampling Techniques and Samples Analysesmentioning

confidence: 99%

“…Similarly, despite the numerous lentic and lotic systems in Agbede wetlands, studies on the chemical hydrology are quite few (Olomukoro & Dirisu, 2012;Dirisu & Olomukoro, 2015). This study seeks to document the limnochemical conditions of the selected lotic and lentic ecosystems with a view to assessing the effects of land use on the quality of the water bodies.…”

Section: Introductionmentioning

confidence: 99%

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Dirisu¹,

Olomukoro²,

Imoobe³

2018

Turk. J. Fish. Aquat. Sci.

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Investigation of the physical and chemical characteristics of selected lotic and lentic ecological systems in Agbede wetlands were under taken between December, 2012 and May, 2014 to assess the quality status of the water bodies. Water samples were collected monthly from seven stations which comprised one stream with three sampling points and three ponds with four sampling points. Thirty two (32) physical and chemical characteristics were determined using standard methods. Application of principal component analysis (PCA) revealed that total dissolved solids; total suspended solids and cadmium were the sources of variations among the parameters in the sampled stations owing to the strong component factors. All the physical and chemical characteristics in the surface waters had their mean values within the set limits by Federal Ministry of Environment of Nigeria (FMEnv.) except for turbidity whose value was > 5 NTU, copper (> 1 mgL -1 ) and zinc (> 1 mgL -1 ). It can be inferred that the selected surface water bodies were in a semi-pristine condition.

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“…The major agricultural purposes include seed and soil treatment and wood, and non-timber treatment (WHO, 1989;Ezemonye et al, 2008). Ezemonye et al (2008) Olomukoro and Dirisu (2012), and Olomukoro et al (2013) in their various studies on the benthic macroinvertebrates of lentic and lotic water bodies in Agbede wetlands, attributed the impairment and the low diversity of macrofauna to the application of Lindane in the water 999 bodies. They asserted that the purpose was to harvest fish for human consumption which has since become a common practice within the localities.…”

Section: Introductionmentioning

confidence: 99%