The Benthic Macro-Invertebrate Fauna of Owalla Reservoir, Osun State, Southwest, Nigeria

Aduwo, Adedeji Idowu; Adeniyi, I. F.

doi:10.21608/ejabf.2019.67372

Cited by 4 publications

(3 citation statements)

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“…Also, widespread and persistent practice of rotational bush farming, couple with the widespread cultivation of cash crops such as cocoa, kolanuts, platin around this waterbody has led to the destruction original vegetation [18]. At the upstream of the reservoir, the major human activities include: farmers, fishermen, washing and bathing, cattle graze, traders of agricultural products and pisciculture or fish farming is pronounced in this region of the reservoir which involves commercial breeding of fish, in fish tanks or artificial enclosures such as fish ponds [24,25]. At Mid-basin of the reservoir, the major human activities include: farming, fishing and washing activities, construction of bridge linking Eko-Eden and Oba was on going in this area, and there was means water transportation by canoe to cross to the neighbouring town.…”

Section: Study Areamentioning

confidence: 99%

“…At Mid-basin of the reservoir, the major human activities include: farming, fishing and washing activities, construction of bridge linking Eko-Eden and Oba was on going in this area, and there was means water transportation by canoe to cross to the neighbouring town. At the downstream there is lesser human activities because it is deepest part except fishing activities [24][25][26]. The reservoir has great potential to become a major tourists' attraction, in the state due possibilities of engaging in various water sports and activities.…”

Section: Study Areamentioning

confidence: 99%

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Assessing the impact of anthropogenic influences on the sediment quality of Owalla Reservoir, Southwest, Nigeria

Aduwo,

Adesakin,

Oyewale

et al. 2023

PLOS Water

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The study aims to investigate the impact of anthropogenic influences within the catchment areas on the sediment physico-chemical quality of Owalla Reservoir in Osun State, Nigeria with the primary aim of creating baseline information on the aspect of limnology. Twenty sampling stations were established along the reservoir representing, its three different sections and two zones. The sampling was conducted for a period of two years to cover both seasons of the year in the area. The sediment samples were collected using a Van-Veen grab of 0.04 m2 area (0.2m × 0.2m) from the waterbed at each sampling locations; labelled, kept in cooler at 4°C and transported to the laboratory for the analysis. The reservoir sediment was mainly clayey-sand in texture, while the particle size distribution was in this order: sand (73.1%) > clay (17.4%) > silt (9.4%). The exchangeable cations order of dominance was in this order: Mg2+ > Ca2+ > H+ > Al3+ > K+ >Na+ and anions in this order: PO34- > SO42- > NO3-> Cl-. The highest mean values for water depth, transparency, air temperature, water temperature and sediment temperature (5.28 ± 0.40 m, 1.60 ± 0.05 m, 31.90 ± 0.29°C, 30.6 ± 0.18°C and 27.6 ± 0.23°C) were recorded during the dry season compared with the rainy season. The results obtained from this study, shows that Owalla Reservoir is fairly clean and not contaminated with toxic pollutants. The sediment pH is within acidic range, and enriched with nutrients due to the anthropogenic activities around this reservoir catchment areas. However, if the organic enrichments and siltation in this reservoir is not controlled, it could lead to the future eutrophication of this waterbody, which can cause water quality degradation, alter the aquatic biota and natural ageing process of this reservoir making it unsuitable for its purposes.

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Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Assessing the impact of anthropogenic influences on the sediment quality of Owalla Reservoir, Southwest, Nigeria

Aduwo,

Adesakin,

Oyewale

et al. 2023

PLOS Water

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“…Owalla reservoir is utilized for domestic, industrial and agricultural usages. The reservoir was designed for the primary purpose to supply water to major towns in the state (Oladejo, 2021), but also for fishery development and agriculture in the state (Aduwo and Adeniyi, 2019). The reservoir is said to contribute significantly to fish production in Osun State, Nigeria and it is known to contain many freshwater fishes (Taiwo, 2010).…”

Section: Introductionmentioning

confidence: 99%

Species Composition and Abundance of the Cichlid Fishes in Owalla Reservoir, Osun State, Nigeria

Kolawole,

Adegoke,

Siji

et al. 2024

dujopas

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Fish production plays crucial roles in enhancing food security and alleviating poverty of many people in Nigeria. As demand for fish increases steadily over the years, production becomes inadequate. One of the ways in which adequate fish production could be met is adequate conservation efforts. This study was conducted with a view of providing a more recent catalogue and update of species composition and abundance of cichlid fishes in Owalla reservoir. Sampling for cichlids fishes in the reservoir was done monthly for 24 weeks with the use of dugout canoe. Four experimental gillnets, each measuring 2 by 30 m, with various stretched mesh sizes (25.4, 38.1, 50.8 and 63.5 mm) were designed to sample various sizes of the fishes. Other sampling techniques adopted include the use of cast net, fish traps and hook and line. The six species of cichlid fishes identified during study are Hemichromis fasciatus (SL=7.35±0.12 cm; mean weight=15.58±9.01g), Sarotherodon galilaeus (SL=11.77±3.12 cm; mean weight=89.48±14.17 g), Oreochromis niloticus (SL=8.35±1.90 cm; mean weight=36.11±10.02 g ), Tilapia zilli (SL=9.95±1.09 cm; mean weight=88.03±16.04 g ), Tilapia mariae (SL=9.83±1.07 cm; mean weight=57.81±14.01 g ) and Tilapia dageti (SL=11.12.±2.01 cm; mean weight=85.30±20.01 g). The fish species were adequately represented, well distributed and occurred frequently in both wet and dry seasons, though the occurrence was higher in the wet season. The mean values of length and weight recorded for the fishes were small when compared with the values of cichlids from similar Nigerian inland waters and was attributed to the indiscriminate use of gillnets with unregulated mesh sizes. Overfishing by the artisanal fishermen could not be ruled out due to lack of regulations on the reservoir. Therefore, regular qualitative and quantitative information on cichlid fishes in the reservoir is necessary for enhancement of management and appraisal of the fisheries potential of the reservoir becomes essential.

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Assessment of the ecological status of an ancient reservoir using macroinvertebrate assemblage and water quality parameters

Amusan,

Adeleke,

Koleosho

2024

JoBAZ

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Background Atori Reservoir, located in the heart of southwestern Nigeria, is a tribute to the region's historical significance and natural splendor. Its establishment as a reservoir in 1935 marked a water resource management watershed in the region, transforming Atori into one of Nigeria’s oldest and most important waterbodies. Despite its ancient age and indisputable importance, the exact ecological state of Atori Reservoir has been shrouded in mystery for decades. This study was necessitated by a paucity of information on the ecological status of Atori Reservoir. Results The study identified 953 macroinvertebrates belonging to four classes, distributed across nine orders and nineteen families within Atori Reservoir. Among these, the class Insecta exhibited the highest diversity, while Melanoides tuberculata, a member of the Mollusca class, emerged as the dominant species. Despite the diverse macroinvertebrate community, the physicochemical parameters of the water raised concerns. Elevated values of total dissolved solids and conductivity indicated poor water quality, which was further reflected in the predominance of pollution-tolerant species and the absence of pollution-sensitive ones. Canonical correspondence analysis highlighted potential correlations between macroinvertebrates and water quality variables, yet statistical significance was lacking, as demonstrated by the Monte Carlo permutation test. Conclusion This study sheds light on the ecological state of Atori Reservoir, revealing a diverse macroinvertebrate community but highlighting concerns regarding water quality. The study also emphasizes the pressing need for improved management practices to safeguard the ecological health of Atori Reservoir, given the critical role it plays in the region's ecosystem and local communities.

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The Benthic Macro-Invertebrate Fauna of Owalla Reservoir, Osun State, Southwest, Nigeria

Cited by 4 publications

References 15 publications

Assessing the impact of anthropogenic influences on the sediment quality of Owalla Reservoir, Southwest, Nigeria

Assessing the impact of anthropogenic influences on the sediment quality of Owalla Reservoir, Southwest, Nigeria

Species Composition and Abundance of the Cichlid Fishes in Owalla Reservoir, Osun State, Nigeria

Assessment of the ecological status of an ancient reservoir using macroinvertebrate assemblage and water quality parameters

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