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

Arimoro, Francis O.; Oganah, Andrew O.

doi:10.2174/1875040001003010001

Cited by 30 publications

(16 citation statements)

References 31 publications

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“…The mean DO values (4.92-5.46 mg/L) recorded in this study all fell under the permissible limits of the Federal Ministry of Environment, but, according to Boyd (1979), the DO threshold level in the water (3-12 mg/L) has been shown to support life-forms in water. In consonance with the reports of Arimoro F. O. et al (2007), Aisien et al (2010), Arimoro and Oganah (2010), and Idise and Maduka (2011) in the same region, there was no significant difference in the DO throughout the stretch of the river under study. The COD and BOD 5 values reported in this study exceeded the Federal Ministry of Environment's permissible limits.…”

Section: Discussionsupporting

confidence: 91%

Water quality evaluation using physicochemical and biological indices to characterize the integrity of the Orogodo River in sub-Saharan Africa

Olomukoro¹,

Obi-Obueze²,

Eko-Imirianye³

et al. 2022

Front. Environ. Chem.

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The preliminary consequence of pollutants in water is to reduce the quality of water although this may not be immediately noticeable because of the self-purifying ability of some water bodies. The study on the physicochemical characteristics, bacteriological, and macrobenthic invertebrates was carried out in the Orogodo River. All the examined physicochemical characteristics of the water showed no significant difference (p > 0.05) across the stations. For the heavy metals, it was in decreasing order as follows: station 2 > station 3 > station 1. All the heavy metals except nickel had high values upstream (station 1). Bacteriological examination of the water revealed the presence of mesophilic bacteria across the stations at p < 0.01 (a highly significant difference). E. coli varied significantly (p < 0.01) across the stations. However, a further evaluation using the DMR test revealed that the population recorded at station 3 was significantly higher than that recorded at stations 1 and 2. A total of 787 macrobenthic invertebrates comprising 44 macroinvertebrates’ taxa were recorded. Most of the macrobenthic faunas observed were distributed across the three stations except the chironomids, the rat-tailed maggot (Eristalis tenax), and the family Hirudinea whose occurrence was almost restricted to station 2. This revealed an ecological impact because this species is a basic indicator of an ecosystem sentinel. Sorenson’s quotient of faunal similarity showed that macrobenthic fauna at these three stations was similar. The similarity was the highest between stations 1 and 3 (75.0%) and the lowest between stations 1 and 2 (50.0%). The biological monitoring working party (BMWP) score system showed that station 2 was moderately polluted, while stations 1 and 3 were only slightly affected. At stations 1, 2, and 3, the arithmetic WQI (water quality) values were 900.99, 1010.10, and 951.20, respectively. The high values of WQI obtained across the stations were attributable to the concentrations of Fe, Cu, Cr, Cd, Ni, Pb, V, and THC, thus reiterating the conclusion drawn from the physicochemical parameter analysis. Boiling the water before consumption is highly recommended to avoid possible human health problems, especially effects from microbial pathogens like coliforms and E. coli.

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Section: Discussionsupporting

confidence: 91%

Water quality evaluation using physicochemical and biological indices to characterize the integrity of the Orogodo River in sub-Saharan Africa

Olomukoro¹,

Obi-Obueze²,

Eko-Imirianye³

et al. 2022

Front. Environ. Chem.

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“…Little or no human activities were responsible for the high zooplankton abundance in station 2 while sand mining activities were responsible for the low abundance in station 4. Arimoro and Oganah (2010) recorded lower abundance in station 3, where sand mining occurred in contrast to station 1 (control) with no activity recorded. Station 6 showed signs of recovery after the impacts.…”

Section: Zooplankton Composition Abundance and Distributionmentioning

confidence: 84%

“…The relatively low zooplankton abundance could be attributed to anthropogenic impact exacerbated by seasonal influences. Arimoro and Oganah (2010) recorded a higher abundance (4322 individuals/1) in the Orogodo River of the Niger Delta, Nigeria, perturbed by abattoir effluent and sand mining activities. The most abundant zooplankton recorded was Daphnia pulex (Cladocera) with 175 individuals/L (5.17% of the total zooplankton abundance).…”

Section: Zooplankton Composition Abundance and Distributionmentioning

confidence: 98%

“…Station 6 showed signs of recovery after the impacts. Arimoro and Oganah (2010) observed that sensitive species usually disappears when water becomes polluted and recovers quickly downstream of the impact source while tolerant species survive stress associated with pollution and flourish. Ko et al (2020) also reported a significant recovery in the number of species and individuals after dredging operations.…”

Section: Zooplankton Composition Abundance and Distributionmentioning

confidence: 99%

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Water quality and zooplankton community of the Eme River, Umuahia, Southeast Nigeria

Anyanwu

Adetunji

Umeham

2021

LFWB

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Abstract. Aquatic ecosystems and biota are often adversely affected by anthropogenic activities. Consequently, zooplanktons have been used to monitor anthropogenic impacts because of their sensitivity to their environment. Water quality and zooplankton community of the Eme River, Umuahia, was assessed between December 2017 and November 2018. The study was carried out in six stations in relation to human activities. Human activities in the watershed were dominated by sand mining. A quantitative filtration method was used for the zooplankton sample collection while standard sample collection and analytical methods were used for the water samples. The zooplankton species recorded were 27 while the most abundant zooplankton group was Rotifera. A known pollution indicator, Daphnia pulex, had the highest number of individuals. The effects of human activities in the watershed were reflected in the results of some of the physicochemical parameters of the river. The zooplankton assemblage and community structure also reflected the effects of human activities in the river. Combined effects of human activities and season contributed to the relatively low zooplankton abundance recorded particularly in some downstream stations. The impacts of sand mining on water quality and zooplankton were more remarkable in the downstream stations (4 6) where the activity was intense while a large number of children swimming and related activities during the dry season had some impacts in station 1. The dominance of indicator and tolerant species indicated that the river was undergoing eutrophication. Sand mining among other observed anthropogenic activities was a major contributor to the nutrient enrichment in the river. The major water quality parameters influencing the zooplankton community structure was revealed by canonical correspondence analysis.

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“…As espécies R. rotatoria e L. bulla foram as que mais contribuíram em termos numéricos na condição Expostos. Essas espécies são beneficiadas por elevados índices de nutrientes e matéria orgânica, reflexo de ações antrópica (Arimoro & Oganah 2010, Begum & Harikrishna 2010, Jorge-Filho et al 2014, Arruda et al 2017, confirmando que essas espécies são tolerantes a condições de alta produtividade.…”

Section: Discussionunclassified

Rotifera De Reservatórios Com Diferentes Exposições Antrópicas Em Um Fragmento Protegido De Mata Atlântica

et al. 2019

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

Cited by 30 publications

References 31 publications

Water quality evaluation using physicochemical and biological indices to characterize the integrity of the Orogodo River in sub-Saharan Africa

Water quality evaluation using physicochemical and biological indices to characterize the integrity of the Orogodo River in sub-Saharan Africa

Water quality and zooplankton community of the Eme River, Umuahia, Southeast Nigeria

Rotifera De Reservatórios Com Diferentes Exposições Antrópicas Em Um Fragmento Protegido De Mata Atlântica

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