Ecological assessment of a coastal shallow lagoon in Lagos, Nigeria: A bio-indicator approach

Balogun, KJ; Ladigbolu, I. A.; Ariyo, AA

doi:10.4314/jasem.v15i1.65673

Cited by 8 publications

(10 citation statements)

References 9 publications

(12 reference statements)

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“…The island is a coastal terrain and is surrounded by rural and urban development, only accessible by boats. Reports have shown that there has been an increase in the discharge of domestic, municipal and industrial effluents, as well as contaminants associated with sand mining, oil and gas industrial tank farms and shipping activities, threatening the ecosystem services that Lagos Lagoon provides (Balogun, Ladigbolu, & Ariyo, 2011;Amaeze, Egonmwan, Jolaoso, & Otitoloju, 2012;Alani, Drouillard, Olayinka, & Alo, 2012;Sogbanmu et al, 2016) Ajagbe et al (2012 recommended the need for more studies to establish the state of pollution in the Lagos Lagoon and the levels of pollutants that are detrimental to the ecosystem health and to humans due to the consumption of contaminated fish. Department of Petroleum Resources (DPR) has described Lagos Lagoon as an important economic and sensitive estuarine ecosystem.…”

Section: Study Areamentioning

confidence: 99%

Bioaccumulation of polycyclic aromatic hydrocarbons, histopathological alterations and parasito-fauna in bentho-pelagic host from Snake Island, Lagos, Nigeria

Akinsanya

Adebusoye

Alinson

et al. 2018

JoBAZ

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Objective: This study investigates the bioaccumulation of polycyclic aromatic hydrocarbons, trophic microbial biomass, parasite prevalence, antioxidant enzyme responses and histological alterations in assessing anthropogenic impacts in Snake Island, Lagos, Nigeria. Methods: Two sample locations were chosen based on the type and nature of human activities: Ilase (fishing-based) and Ibasa (petroleum industry-based) communities. Fifteen PAH congeners were analysed from water, sediment, benthic invertebrates, three species of bentho-pelagic fishes and their parasito-fauna using GC/FID. Also, estimated from these samples were trophic microbial biomass, stress enzymes and histopathological alteration index of the fish gill. Results: A significant proportion of PAHs was found in sediments originating from Ilase and Ibasa communities compared to all other samples analysed. Percentage distribution in the various compartments of the former was water, 2.67%; sediment, 91.28%; benthos, 1.19%; fish, 3.15%; and parasite, 1.71%. The corresponding PAH values obtained for Ibasa were 57.83%, 40.07%, 0.00%, 0.01% and 0.01% respectively for water, sediment, benthos, fish, and parasite. Biota-sediment accumulation factor (BSAF) for benthos, fish, and parasite were 0.01, 0.03 and 0.02, respectively, whereas the proportions of hydrocarbon utilizing bacteria in both sediment and water columns of Ilase were 0.18% and 17.6%, respectively, and those obtained from Ibasa were 0.001% and 0.03%. Among the PAH residues, naphthalene had the highest concentration. Ibasa had greater hydrocarbon utilizers and parasitic protozoa prevalence. This location had higher gill-induced malondialdehyde, catalase, glutathione peroxidase, glutathione and glutathione S-transferase. Also, it showed greater Histopathological Alteration Index (HAI) of 28.0 compared to Ilase community with HAI of 11.0. Generally, the sum of PAH concentrations in the sediment and water columns in both study sites fell within the EPA regulated limit (< 1000 ng/g). Conclusion: This indicates that the sediment and water on both sites were of moderate ecological risk. PAH residues accumulated in sediments, as well as in benthic invertebrates, get into bentho-pelagic host food chain and food webs; these could pose a significant risk to human health. As a result of this, continuous monitoring is highly advised.

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Section: Study Areamentioning

confidence: 99%

Bioaccumulation of polycyclic aromatic hydrocarbons, histopathological alterations and parasito-fauna in bentho-pelagic host from Snake Island, Lagos, Nigeria

Akinsanya

Adebusoye

Alinson

et al. 2018

JoBAZ

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“…Even though lagoons are shallow water bodies, the Lagos Lagoon that is the lagoon for consideration in this chapter (our research) has some parts around the inlets that are deep (12-17 m) as a result of continuous dredging either for the purpose of sand mining and reclamation or for channel navigation. Likewise, it is considered too brackish during the dry season and a fresh water lagoon during the raining season [50,51].…”

Section: Lagoon Stratificationmentioning

confidence: 99%

Morphodynamics in a Tropical Shallow Lagoon: Observation and Inferences of Change

Alademomi¹,

Manning²,

Abbott³

et al. 2020

Lagoon Environments Around the World - A Scientific Perspective

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The Lagos Lagoon system and its adjacent tidal basins exhibit dynamics that are significantly different on both spatial and temporal scales. As urbanisation and human activities around the lagoon have intensified, the volume of sediment deposited into the basin is increasing on a daily basis. Changes on the lagoon bed over a 6-year time scale using repeated bathymetric data (2008, 2014) are presented, and the related data acquisition technique is explained. Data reduction is followed by analysis of the lagoon water bed dynamics using abstracted profile lines from the bathymetric data within a GIS environment. The results of the significant accretion and erosion within the lagoon system were analyzed spatially to quantify the volume of sediment gain or loss on the lagoon bed. The findings partly show that over 6 years, an average height of 0.16 m was gained by the lagoon. This amount translates into an annual accretion rate of 0.026 m. These findings enhance the prospect of verifying in the long term whether the Lagos Lagoon is gradually disappearing. To the best of the author's knowledge, this research reveals for the first time the complex evolutionary changes (channel movement, accretion, erosion, infill and movement of shoal) on the Lagos Lagoon bed.

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“…The low abundance of majority of the sea stars, composition and diversity recorded in this study may be attributed to stress imposed by indiscriminate anthropogenic activities (Ajao et al, 1996) such as industrial effluent discharge, oil wastes, domestic waste, and sewage discharges among others as human related activities are capable and presently destroying the sensitive coastal environment (Balogun et al, 2011).…”

Section: Species Compositionmentioning

confidence: 99%

Species Diversity of Sea Stars Along the Intertidal Zones of Selected Areas in Davao Gulf, Philippines

Juico¹

2014

ENRR

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This study was undertaken to provide biological information on the species distribution and abundance of sea stars as well as the physico-chemical status of the seawater of selected intertidal zones of Davao Gulf for sustainable use of marine resources. This study was conducted along the 10 selected intertidal zones of Davao Gulf specifically in Davao City, Philippines. Results showed a total of 2357 individuals identified. These species belong to 8 genera and 4 families of sea stars. Of these, 1842 species belong to family Astropectinidae, 484 species are under the family of Ophidiasteridae, 30 species for family Oreasteridae, and 1 species in the family of Acanthasteridae.Sampling was done from September 2010 to March 2011. The study revealed a diversity index of 28.45% using Shannon-Weiner showing low species richness and evenness. Majority of the sampling area (80%) are composed of sandy substrate while 20% have silty and muddy substrate. Of the sandy substrate, 30% of which have coral rubble, 40% have sea grasses and only 10% were observed with living corals. Species richness generally increases with increasing water quality, habitat diversity and or habitat suitability and is expected to decrease with human induced disturbance. Although statistics revealed there were no significant relationship between the number of sea star species and the physico-chemical parameters except for the BOD which recorded a much lower value compared to the criteria set by the government. Literature readings cites the possibility that the temperature might be the cause of the sudden change of BOD since temperature affects the rate of photosynthesis of plants, the metabolic rate of aquatic animals, rates of development, timing and success of reproduction, mobility, migration patterns and the sensitivity of organisms to toxins, parasites and diseases.

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Ecological assessment of a coastal shallow lagoon in Lagos, Nigeria: A bio-indicator approach

Cited by 8 publications

References 9 publications

Bioaccumulation of polycyclic aromatic hydrocarbons, histopathological alterations and parasito-fauna in bentho-pelagic host from Snake Island, Lagos, Nigeria

Bioaccumulation of polycyclic aromatic hydrocarbons, histopathological alterations and parasito-fauna in bentho-pelagic host from Snake Island, Lagos, Nigeria

Morphodynamics in a Tropical Shallow Lagoon: Observation and Inferences of Change

Species Diversity of Sea Stars Along the Intertidal Zones of Selected Areas in Davao Gulf, Philippines

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