Spatial Changes in the Wetlands of Lagos/Lekki Lagoons of Lagos, Nigeria

Obiefuna, Jerry; Nwilo, Peter C.; Atagbaza, Ajiri O.; Okolie, Chukwuma J.

doi:10.5539/jsd.v6n7p123

Cited by 36 publications

(33 citation statements)

References 14 publications

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“…The Lagos Lagoon, located between 6°26′N, 3°23′E and 6°38′N, 3°43′E, is the largest of the lagoons in the southern lagoon system of Nigeria with a maximum length of 50 km, maximum width of 13 km and a surface area of 6354.7 km 2 (Obiefuna, Nwilo, Atagbaza, & Okolie, ). It is separated from the Atlantic Ocean by a long sand spit 2–5 km wide, which has swampy margins on the lagoon side and is characterized by a clearly defined wide expanse of open water zone and littoral zone (Ajao, ); its intricate and diverse ecological profile compared to other lagoons within the southern lagoon system is hinged on its salinity gradient, which allows the co‐existence of a wide variety of freshwater and marine species (Ajagbe, Osibona, & Otitoloju, ; Ajao & Fagade, )Two parts of the lagoon were chosen for this study; the mid‐lagoon (6°31′30.30′N, 3°28′0.07′E) in the open water zone of the lagoon and the littoral or inter‐tidal zone of the lagoon at Ajah (6°28′17.8′N, 3°32′55.8′E).…”

Section: Methodsmentioning

confidence: 99%

Sex‐specific affinity for redox‐active metals influences antioxidant responses of Callinectes amnicola (blue crab) populations in littoral and open water habitats of a tropical coastal lagoon

Jerome

Hassan

Chukwuka³

2017

Marine Ecology

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The critical role of ecological preferences and opportunity in determining contaminant uptake and adaptive responses of sexes in the wild is still poorly understood. This ecological relationship was investigated by measuring metal bioaccumulation and antioxidant activity in male and female blue crab populations from open water habitat and the littoral/inter‐tidal zone of the Lagos Lagoon. A total of 741 samples of blue crab (littoral zone: 263 females, 137 males; open water zone, 230 females, 111 males) was collected monthly over 24 months (January 2010–January 2012) from each site and the measurements of morphometric features (wet weight, carapace length, carapace width) were recorded; condition index, metal (redox active: Cu, Zn, redox inactive: Pb, Cd) concentration in tissues (gills, hepatopancreas, gonads and muscle) and antioxidant activity (superoxide dismutase, reduced glutathione, glutathione peroxidase, catalase and malondialdehyde) were measured for each sex. Monthly sediment samples for both habitats were also analysed for metals using standard methods. Female crabs were significantly larger (p < .05) with a better condition index than the male crabs across sites and seasons, while higher oxidative damage was recorded in male crabs in the littoral zone compared to the open water zone. The results show that there was a negative association between antioxidant activity and lipid peroxidation; a negative relationship between concentrations of redox‐inactive metals (Pb and Cd) and antioxidant activity in male crab tissues; and a positive relationship between uptake of a redox‐active metal (Cu) and antioxidant activity in female crab tissues. Although these trends suggest sex‐specific toxicity, they also associate redox‐inactive metals with the downregulation of antioxidant activity and oxidative stress. Furthermore, the higher condition index of females corroborates the possibility of sex‐specific toxicity, while the larger‐sized females compared to males suggests size‐sexual dimorphism in the blue crab populations. The site‐specific oxidative damage between sexes may be attributed to the different complexity of both habitats, which affords different ecological opportunities for the sexes.

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Section: Methodsmentioning

confidence: 99%

Sex‐specific affinity for redox‐active metals influences antioxidant responses of Callinectes amnicola (blue crab) populations in littoral and open water habitats of a tropical coastal lagoon

Jerome

Hassan

Chukwuka³

2017

Marine Ecology

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“…Ibeju-Lekki represents one of the rapidly urbanising peri-urban settlements in Lagos in terms of residential development and population growth (Obiefuna, Nwilo, Atagbaza & Okolie, 2013 …”

Section: Ibeju-lekki Local Government Areamentioning

confidence: 99%

Assessment of housing quality in Ibeju-Lekki periurban settlement, Lagos State, Nigeria

Adedire

Adegbile

2018

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This article assesses housing quality in IbejuLekki, a peripheral settlement outside Lagos metropolitan region. Using purposive sampling, 370 housing units from clusters of 16 periurban settlements constituted the sample size. Primary data was sourced through structured questionnaires, interview (with local planning personnel) and observation schedules administered through a field survey. Using Statistical Package for Social Sciences, data analysis was done using descriptive analysis to generate frequen cies and percentages on socio-economic profile, neighbourhood quality, locational quality, dwelling quality, and building materials used. Tests of correlation were conducted on the mean of variables of neighbourhood quality, locational quality and building materials, derived through recoding of variables by means of Transform statistical tool, to establish the factors influencing housing quality in the study area. The findings show a significant positive correlation between household income and housing quality. The latter is found to be influenced by respondents' socio-economic attributes, building materials, neighbourhood quality, and locational quality in the study area. It can be concluded that socio-economic characteristics, predominantly income of households, play a major role in the level of housing quality that can be accessed in the study area. It is, therefore, recommended that the state government and private developers should promote alternative building materials, in order to enhance housing affordability by the low-income group. This will reduce the spread of informal housing development. In addition, the state govern ment should align urban policy to eliminate disparity in

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“…Some of the major conclusions emerging from these studies show that significant sprawl and development in residential and industrial or commercial land classes are progressively taking place. There has been also been increasing pressure on arable lands (Akpomrere and Nyorere, 2012) and depletion of wetlands, mangroves, and swamps are significant issues (Obiefuna et al, 2013). The associated migration of people into Lagos city from other rural communities and states in Nigeria escalates residential needs and challenges.…”

Section: Exposurementioning

confidence: 99%

Review article: A review and critical analysis of the efforts towards urban flood risk management in the Lagos region of Nigeria

Nkwunonwo

Whitworth

Baily

2016

Nat. Hazards Earth Syst. Sci.

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Abstract. Urban flooding has been and will continue to be a significant problem for many cities across the developed and developing world. Crucial to the amelioration of the effects of these floods is the need to formulate a sound flood management policy, which is driven by knowledge of the frequency and magnitude of impacts of these floods. Within the area of flood research, attempts are being made to gain a better understanding of the causes, impacts, and pattern of urban flooding. According to the United Nations office for disaster reduction (UNISDR), flood risk is conceptualized on the basis of three integral components which are frequently adopted during flood damage estimation. These components are: probability of flood hazard, the level of exposure, and vulnerabilities of elements at risk. Reducing the severity of each of these components is the objective of flood risk management under the UNISDR guideline and idea of "living with floods". On the basis of this framework, the present research reviews flood risk within the Lagos area of Nigeria over the period 1968-2012. During this period, floods have caused harm to millions of people physically, emotionally, and economically. Arguably over this period the efforts of stakeholders to address the challenges appear to have been limited by, amongst other things, a lack of reliable data, a lack of awareness amongst the population affected, and a lack of knowledge of flood risk mitigation. It is the aim of this research to assess the current understanding of flood risk and management in Lagos and to offer recommendations towards future guidance.

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Spatial Changes in the Wetlands of Lagos/Lekki Lagoons of Lagos, Nigeria

Cited by 36 publications

References 14 publications

Sex‐specific affinity for redox‐active metals influences antioxidant responses of Callinectes amnicola (blue crab) populations in littoral and open water habitats of a tropical coastal lagoon

Sex‐specific affinity for redox‐active metals influences antioxidant responses of Callinectes amnicola (blue crab) populations in littoral and open water habitats of a tropical coastal lagoon

Assessment of housing quality in Ibeju-Lekki periurban settlement, Lagos State, Nigeria

Review article: A review and critical analysis of the efforts towards urban flood risk management in the Lagos region of Nigeria

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