Meiofauna Occurrence and Distribution in Different Substrate Types of Bonny Brackish Wetland of the Niger Delta

Chindah, AC; Braide, SA

doi:10.4314/jasem.v5i1.54937

Cited by 5 publications

(6 citation statements)

References 12 publications

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“…Values of pH have been found to decrease with the growth of aquatic macrophytes (Kikuchi et al, 1976). Also, comparable pH range has been reported by Chindah and Braide (2001) for Bonny Brackish wetland and Ezekiel et al (2011) in Sombreiro River. pH fluctuated between 5.90 (slightly acidic) -7.35 (slightly alkaline) in Ponds of Agbede flood plain (Olomukoro et al, 2013).…”

Section: Resultssupporting

confidence: 87%

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Physicochemical Characteristics of the Okomu Wetland, Edo State, Nigeria

Ogbeibu

Ehiorobo

2020

Nig. J. Env. Sci. & Tech.

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Water quality assessment was carried out within the 202 km2 Okomu National Park located within the 1,082km2Okomu Forest Reserve between January 2017 and December 2018. Water sampling was carried in ten compartments of approximately 1.6km2 each, covering Ponds, Stream and River, based on easy accessibility. No such study has been carried out for the Okomu Wetlands in the past three decades. Sampling protocols, laboratory analysis and quality control/quality assurance measures followed standard procedures. All physicochemical parameters showed significant (P < 0.001) spatial variations. The maximum and minimum values obtained for physicochemical parameters of the Okomu Wetland are 23.6 and 38.0°C air temperature; 21.0 – 38°C water temperature; 0.15 – 1.02m water level; 16.7 – 150.7mg/l total dissolved Solids (TDS); 0.5 – 18.8mg/l total suspended Solids (TSS); 0.2 – 14.8mg/l turbidity; 40. 0 – 307.4µS/cm electrical conductivity (EC); 4.4 – 6.7 pH; 0.02 – 0.14mg/l salinity; 0.7 – 5.5mg/l dissolve oxygen (DO); 0.5 – 3.8mg/l biochemical oxygen demand (BOD); 1.5 – 120.2mg/l chemical oxygen demand (COD); 23.8 – 593.6mg/l bicarbonates (HCO3); 69.9 – 245.3mg/l Chlorine (Cl); 0.02 – 0.59mg/l nitrite (NO2); 0.11 – 2.34mg/l nitrate (NO3); 0.04 – 2.11mg/l ammonium-nitrogen (NH4N); 0.05 – 2.96mg/l sulphate (SO4); 0.09 – 9.2mg/l phosphorus (P); 0.20 – 2.72mg/l sodium (Na), 0.03 – 1.32mg/l potassium (K); 0.88 – 5.88mg/l calcium (Ca); 0.13 – 3.1mg/l magnesium (Mg); 5.8 – 18.9mg/l iron (Fe); 0.04 – 1.1mg/l manganese (Mn); 0.02 – 0.09mg/l copper (Cu); 0.93 – 6.0mg/l zinc (Zn); 0.01 – 2.9mg/l lead (Pb); 0.01 – 0.18mg/l cadmium (Cd); 0.06 – 4.0mg/l chromium (Cr); 0.01 – 0.15mg/l nickel (Ni); 0.01 – 11mg/l vanadium (V). Air and water temperatures were mostly influenced by forest canopy cover. pH levels indicate that the water bodies within the forested wetland are slightly acidic. Higher DO values were recorded in the Arhakhuan Stream and Okomu River (Agekpukpu and Iron bridge) than in the temporary ponds. BOD levels of greater than 1mg/l were observed which is indicative of slight levels of organic pollution. Higher concentrations of TDS, TSS, turbidity, EC, Colour, HCO3, NH4N, NO2, NO3, P, Na, K, Ca Mg and heavy metals were recorded in the temporary ponds than in the Stream and River. Research on water bodies within wetlands should be carried out routinely in order to monitor changes in the water conditions that could occur overtime whether natural or anthropogenic. This becomes even more pertinent in the light of glaring impacts of climate change and increasing environmental modifications.

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Section: Resultssupporting

confidence: 87%

“…In this study, the variations of phosphate levels reflected spatial variations. The mean concentrations of ammonium-N and nitrate for this study were higher than that recorded by Chindah and Braide (2001) at Bonny Brackish Wetland of the Niger Delta. The WHO's permissible limit of nitrate is 50 mg/l.…”

Section: Resultscontrasting

confidence: 75%

Physicochemical Characteristics of the Okomu Wetland, Edo State, Nigeria

Ogbeibu

Ehiorobo

2020

Nig. J. Env. Sci. & Tech.

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“…El comportamiento de las densidades mensuales de nemátodos en la playa San Luis CUADRO 1 Datos acerca de la toma de muestras, separación de la meiofauna, número de grupos (N) y densidad (ind./m 2 ) de la meiofauna en algunas localidades tropicales americanas* concuerda con los resultados obtenidos por Albuquerque et al (2007) y por Chindah & Braide (2001), mientras que el de los copépodos contrasta con lo manifestado por estos autores, al señalar que nemátodos y copépodos son más abundantes en los meses lluviosos y contradice lo observado por Guzmán-Espinal et al (1987), quienes observaron que estos grupos son más numerosos en la época de sequía. La evolución del promedio de la densidad mensual no permite apreciar una clara relación con las condiciones climáticas, aunque se observó una tendencia a la reducción de la densidad desde octubre hasta febrero, esto es, desde el final de la época de lluvias hasta la parte media de la época de sequía, y los valores más bajos en julio y agosto, en pleno periodo lluvioso, lo cual se asemeja parcialmente a los resultados obtenidos por Chindah & Braide (2001), quienes manifiestan que las mayores abundancias de la meiofauna se presentaron en el periodo seco; aunque señalan que algunos táxones fueron abundantes en un periodo mientras otros lo fueron en otro, relacionando esas diferencias con el incremento de nutrientes durante la estación sea y con interacciones inter e intraespecíficas. Por su parte, Coull (1970) manifestó que en regiones tropicales se puede apreciar cierta estacionalidad, con las mayores abundancias durante el periodo más cálido.…”

Section: Discussionunclassified

Variación espacio-temporal de la meiofauna submareal en una playa arenosa nororiental de Venezuela

Arana

Ojeda

Amaro

2013

RBT

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Spatio-temporal variation of subtidal meiofauna in a sandy beach from Northeastern Venezuela. Meiofauna organisms that play an important role in the trophic ecology of soft bottom benthos, have short life cycles and they respond quickly to disturbance and pollution. The present study shows the spatio-temporal variation of subtidal meiofauna (metazoans passing a 500µm sieve but retained on meshes of 40-63µm) in four shallow subtidal stations. Samples were taken in the sandy beach of San Luis, in the Northeastern coast of Venezuela, from October 2005 until September 2006. For this, three replicate sediment core samples (4.91cm 2), were collected monthly to a depth of 10cm into the sediment, and preserved in 6% formalin stained with rose Bengal. Specimens of 14 meiofaunal groups (Foraminifera excluded) were collected, being the nematodes, ostracods and harpacticoid copepods the most abundant. Monthly density was comprised between 64 and 503ind./10cm 2 , and mean density of stations between 173 and 449ind./10cm 2. There is a trend of low densities from October to February (end of the rainy season until the middle of the dry season). The San Luis beach control of the meiofaunal community is shared by climatic conditions and by the biology of the species found. The meiofauna mean density in San Luis beach (263ind./10cm 2) was low when compared to other studies in tropical areas. Rev. Biol.

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“…Until recently, man has tended to take this abundant natural resource for granted [1]. The increased concern on the rapid ecological changes in the natural environment has provided major challenges to the scientific community [2]. The emerging empirical facts have shown the susceptibility and sensitivity of ecological assemblages which have been ignored especially the open water body dwelling communities in brackish and other waters of Niger Delta.…”

Section: Introductionmentioning

confidence: 99%

Physico-Chemistry of Elechi Creek in the Upper Bonny Estuary, Rivers State, Nigeria

Ngah¹,

Braide²,

Dike³

2017

GEP

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The physico-chemistry of tidal Elechi Creek in the upper Bonny Estuary was investigated to assess the toxicity of the water body as this could have adverse effects on the native organisms that form part of the ecosystem and to evaluate the extent and magnitude of petroleum hydrocarbon and heavy metal concentration in the water body. Standard field procedures were adopted in sample collection while laboratory analysis was carried out also following standard methods. Parameters measured include pH, temperature, dissolved oxygen (DO), biological oxygen demand (BOD), electrical conductivity, salinity and total dissolved solids (TDS). Heavy metals namely Copper (Cu), Lead (Pb), Zinc (Zn), nitrate (NO 3 ), sulphate (SO 4 ), Ammonia (NH 4 ), and Total Hydrocarbon Concentration (THC) in the surface water body were also determined on samples collected from five (5) sampling stations spread along the creek in both dry and wet seasons. The results showed that the surface water body is oligohaline with low acidity, pH values ranging from 6.2 to 7.6. Temperature varies from 27˚C to 30˚C. Dissolved Oxygen (DO) concentration ranges from 2.9 to 7.5 mg/l which is adequate for aquatic organism with Biological Oxygen Demand (BOD) values varying from 0.45 to 7.0 mg/l. The values of total dissolved solids (TDS) vary from 11,700 mg/l to 26,250 mg/l with the highest mean value obtained at the study station located downstream. The mean nutrient concentration showed that the study area is not eutropic. Anthropogenic activities were very high at the sites throughout the period of the study and may have resulted in the stress conditions of the area. Pollution trend along the study stations showed that no one station is unpolluted. The study recommends the introduction of enforceable and stringent waste management plans to highlight and discourage direct discharge of untreated waste and storm water runoff into an aquatic environment.

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Meiofauna Occurrence and Distribution in Different Substrate Types of Bonny Brackish Wetland of the Niger Delta

Cited by 5 publications

References 12 publications

Physicochemical Characteristics of the Okomu Wetland, Edo State, Nigeria

Physicochemical Characteristics of the Okomu Wetland, Edo State, Nigeria

Variación espacio-temporal de la meiofauna submareal en una playa arenosa nororiental de Venezuela

Physico-Chemistry of Elechi Creek in the Upper Bonny Estuary, Rivers State, Nigeria

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