Satellite-Based Assessment of the Extent and Changes in the Mangrove Ecosystem of the Niger Delta

James, Godstime K.; Adegoke, Jimmy; Saba, Ekechukwu; Nwilo, Peter C.; Akinyede, J. O.

doi:10.1080/01490410701438224

Cited by 114 publications

(50 citation statements)

References 15 publications

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“…2). Other studies in the Niger Delta (e.g., James et al, 2007) have also reported similar result. Though both studies had differences in changes in the total area of mangroves, their outcome still reflects a slow and steady decline over the years.…”

Section: Landscape Pattern and Changesupporting

confidence: 76%

“…Though both studies had differences in changes in the total area of mangroves, their outcome still reflects a slow and steady decline over the years. Our study had a 4% decrease in mangroves, while James et al (2007) had less than 5% decrease. Other global studies have shown a general decline in the total area of mangroves (Finlayson et al, 1999;Giri et al, 2011;Spalding et al, 1997;Valiela et al, 2001).…”

Section: Landscape Pattern and Changementioning

confidence: 99%

“…Pollution in the study area causes the yellowing and defoliation of leaves, suffocation and death of propagules, trees and other mangrove ecosystem inhabitants (e.g., fish, crabs and periwinkle). Previous studies have attributed the loss of 210 km 2 of mangrove as a result of urbanization, dredging and oiling activities (James et al, 2007). Therefore, landscape change is an estimate of the direct or indirect impact of oil and gas exploration, which is a combination of both chemical pollution and physical disturbances.…”

Section: Effect Of Oil and Gas Explorationmentioning

confidence: 99%

“…This, in turn, results in other negative environmental impacts like dredging of wetlands, road and channel constructions, deforestation, increased soil and water pollution. In the Niger Delta, James et al (2007) reported that 210 km 2 of mangroves forest had been removed as a result of oil and gas exploration. Beside pollution, Nypa palm (Nypa fruticans, Wurmb) invasion is a major threat to mangrove in the Niger Delta (CEDA, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…Some studies have used Landsat to calibrate spatio-temporal disturbancemediated changes in mangroves (Anwar and Takewaka, 2014;James et al, 2007) at different spatial scales. In the Niger Delta, the impact of hydrocarbon pollution on mangroves has been done at both small (Snowden and Ekweozor, 1987;Osuji et al, 2004) and large (James et al, 2007) scale levels. We used spatial statistics to quantitatively determine the relationship between oil and gas exploration and mangrove and between mangrove and nypa palm.…”

Section: Introductionmentioning

confidence: 99%

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Long-Term Changes in Mangrove Landscape of the Niger River Delta, Nigeria

Wang¹,

Numbere²,

Camilo³

2016

American Journal of Environmental Sciences

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Abstract:The Niger Delta mangrove is the third largest in the world and the largest in Africa. Since the 1960s oil and gas exploration has become an important economic activity, resulting in significant alteration of the landscape via pollution, urbanization and invasion. Landsat images of six different years (1984, 1986, 2000, 2003, 2005 and 2007) were used to determine land cover across 3, 700 km 2 . Landscape was segregated between areas with oil and gas exploration and those without. Two forest types were identified namely mangrove and mixed, which were further decomposed into high (Mang 1) and low (Mang 2) density mangroves and palms. A total of 145 landscape square samples, each 6.76 km 2 were randomly selected in each map and statistically analyzed and modeled. The results showed that the kappa coefficient for the six years were all >0.9, (i.e., 0.93, 0.07, 0.94, 0.93, 0.90 and 0.94) indicating high classification accuracy. Also great change in mangrove landscape occurred in the last decade. Locations with increased oil and gas activities had significantly decreased amount of mangrove and palm forests. Also mixed forests increased over time and had a significant negative relationship with mangrove, Mang 1 and Mang 2. Even though the total area of mangrove forest did not change significantly (p>0.05), the total biomass of mangrove decreased (p<0.01). Nypa palm abundances increased over time, yet, it is negatively affected by the exploration. Increase in mixed forest and urban region has negatively affected the mangrove forest in the Niger's delta landscape. High density mangrove forest withstood better the impacts of oil and gas exploration compared to mixed forest, but low density mangrove forest was the opposite. This suggests complex landscape level effects among different forest types.

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Section: Landscape Pattern and Changesupporting

confidence: 76%

Section: Landscape Pattern and Changementioning

confidence: 99%

Section: Effect Of Oil and Gas Explorationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Long-Term Changes in Mangrove Landscape of the Niger River Delta, Nigeria

Wang¹,

Numbere²,

Camilo³

2016

American Journal of Environmental Sciences

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Economic Valuation of Mangroves in the Niger Delta

et al. 2011

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Today, the concept of an interdisciplinary approach to research has gained tremendous attention, both because it is an antithesis to the conventional divisions of knowledge-based research, and because complex problems in applied research almost always span various disciplines. This study explores one interdisciplinary approach to research, which addresses the problem of equitable mangrove valuation for the sustainable management of the resource in the Niger Delta region of Nigeria. By integrating results from satellite remote sensing analysis and socioeconomic surveys, the economic value of mangroves in the Niger Delta, discounted over a 30-year period at 20% discount rate, ranges from $640-2,825ha. The variation in economic value is attributed to the variation in the socioeconomic characteristics of the communities that participated in the study.

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