“Analysis of the Effects of Urban Expansion on Wetland Ecosystems in Makurdi, Benue State

CHAPTER ONE

1.0 Introduction

Urban expansion is one of the major drivers of environmental change in many developing countries. As cities grow, natural ecosystems such as wetlands are often converted into residential, industrial, and commercial areas. Wetlands provide essential ecological services, including flood control, groundwater recharge, and biodiversity support. However, rapid urban development has led to the degradation and loss of these valuable ecosystems.

In Makurdi, the capital city of Benue State, population growth and urbanization have increased significantly over the past two decades. The demand for land for housing, roads, and infrastructure has caused encroachment on wetland areas. As a result, many wetlands that once supported diverse plant and animal species are now under threat. Understanding how urban expansion affects these ecosystems is important for promoting sustainable city development and environmental protection.

1.1 Background to the Study

Wetlands are transitional ecosystems that exist between terrestrial and aquatic environments. They perform several ecological functions such as water purification, flood regulation, and habitat provision for wildlife. Moreover, they serve as sources of livelihood for communities through fishing, farming, and harvesting of natural materials. Despite their importance, wetlands remain one of the most threatened ecosystems globally due to human activities (Mitsch & Gosselink, 2015).

In Makurdi, the expansion of residential and commercial areas has accelerated since the early 2000s. Construction activities often involve land reclamation, drainage alteration, and vegetation clearance. Consequently, wetlands have experienced reduced water retention capacity, soil compaction, and loss of biodiversity. According to Ake & Ayuba (2021), the decline of wetlands in Makurdi has contributed to increased flooding and a reduction in groundwater recharge rates.

Urbanization changes land use patterns, increases impervious surfaces, and alters hydrological processes. Therefore, analyzing how these changes affect wetland ecosystems helps in planning sustainable land use. This study investigates the relationship between urban expansion and wetland degradation in Makurdi, highlighting the ecological and socio-economic implications of this transformation.

1.2 Statement of the Problem

Rapid urbanization in Makurdi has placed intense pressure on natural ecosystems. Wetlands that once absorbed floodwaters and supported biodiversity are now being converted into built-up areas. Consequently, flooding has become more frequent, and water quality has declined. In addition, soil erosion and loss of vegetation have worsened environmental instability.

Although several studies have examined urban growth in Benue State, few have specifically focused on its effects on wetland ecosystems. Without adequate knowledge of these impacts, urban planning policies may continue to overlook the ecological value of wetlands. Therefore, there is a need to analyze the effects of urban expansion on wetland ecosystems in Makurdi and provide data that can guide effective environmental management.

1.3 Aim and Objectives of the Study

The main aim of this study is to analyze the effects of urban expansion on wetland ecosystems in Makurdi, Benue State.

The specific objectives are to:

1. Identify the major factors driving urban expansion in Makurdi.

2. Map the spatial extent of wetland loss between 2005 and 2025 using satellite imagery.

3. Examine the ecological effects of urban development on wetland habitats and biodiversity.

4. Recommend strategies for the sustainable management and protection of wetlands in Makurdi.

1.4 Research Questions

1. What are the main drivers of urban expansion in Makurdi?

2. How has the extent of wetland coverage changed over time?

3. What ecological impacts has urban development caused on wetland habitats and species?

4. What strategies can ensure the sustainable management of wetlands in Makurdi?

1.5 Significance of the Study

This study provides valuable insights into how urban growth affects natural ecosystems, particularly wetlands. The findings will help environmental planners, policymakers, and city authorities understand the importance of integrating wetland conservation into urban development policies. Moreover, the research contributes to achieving Sustainable Development Goals (SDGs) 11 and 15, which focus on sustainable cities and the protection of terrestrial ecosystems.

In addition, the study raises public awareness about the ecological and economic value of wetlands. It also provides a scientific basis for decision-making on land allocation and urban design in Makurdi. By identifying areas of severe degradation, the study encourages restoration efforts and the adoption of environmentally friendly urban practices.

1.6 Scope of the Study

This study focuses on selected wetlands within Makurdi metropolis, including areas along the River Benue floodplain. It examines changes in land use patterns and wetland extent over a 20-year period using remote sensing and geographic information system (GIS) techniques. The research also evaluates the ecological impacts of urban activities such as construction, waste disposal, and deforestation on wetland environments. Other environmental factors, such as air quality or groundwater contamination, are beyond the scope of this study.

1.7 Definition of Key Terms

• Urban Expansion: The process by which urban areas grow outward into surrounding rural or natural lands.

• Wetland Ecosystem: A land area that remains saturated with water, supporting aquatic plants and diverse organisms.

• Land Use Change: The transformation of natural landscapes into human-dominated environments such as residential or commercial zones.

• Biodiversity: The variety of plant and animal species within a specific ecosystem.

• Sustainable Management: The responsible use of natural resources to ensure environmental stability for future generations.

References

Ake, M. J., & Ayuba, H. K. (2021). Urban growth and wetland degradation in Makurdi, Nigeria. Nigerian Journal of Environmental Studies, 19(2), 71–85.
Mitsch, W. J., & Gosselink, J. G. (2015). Wetlands. John Wiley & Sons.
Onoja, P. I., & Ali, S. E. (2022). The impact of urban development on wetland ecosystems in Benue State. Journal of Geography and Environmental Management, 13(3), 94–108.