Journal Design Science Quartz
African Rural Development Studies (Interdisciplinary - | 10 April 2023

Socio-ecological Dynamics of Inland Valley Swamp Development and Malaria Transmission in Northern Sierra Leone

A Scoping Review
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Socio-ecological systemsMalaria transmissionAgricultural hydrologyScoping review
Positive association between IVS development and increased malaria vector breeding habitats
30-50% higher vector density in developed vs undeveloped swamps during rainy season
Evidence shows considerable heterogeneity with confidence intervals frequently crossing zero
Fragmented evidence base lacks longitudinal, interdisciplinary health impact studies

Abstract

{ "background": "Inland valley swamps (IVS) are critical agro-ecosystems for rice cultivation in sub-Saharan Africa, yet their development alters local hydrology and ecology, potentially influencing malaria transmission dynamics. The socio-ecological interplay between agricultural intensification in these wetlands and vector-borne disease risk in adjacent communities remains inadequately synthesised, particularly for the Northern Region.", "purpose and objectives": "This scoping review aims to map and synthesise existing evidence on the socio-ecological linkages between IVS rice development and malaria incidence in the Northern Region's farming communities, identifying key knowledge gaps and proposed intervention pathways.", "methodology": "The review followed the Joanna Briggs Institute framework. A systematic search of peer-reviewed and grey literature was conducted across multiple electronic databases. Studies were screened and charted by two independent reviewers. Data were analysed thematically, and a socio-ecological systems framework guided the synthesis. The relationship between environmental covariates and malaria incidence was modelled using a generalised linear mixed model of the form $\\log(E(Y{it})) = \\beta0 + \\beta1 X{1it} + ... + ui + \\epsilon{it}$, where $u_i$ represents random effects for study location.", "findings": "The available evidence, while limited, consistently indicates a positive association between IVS development and increased malaria vector breeding habitats, though the strength of association shows considerable heterogeneity (95% confidence intervals for key parameters frequently cross zero). A prominent theme is the modification of larval habitat persistence and Anopheles species composition. One study reported a 30-50% higher vector density in developed versus undeveloped swamps during the rainy season.", "conclusion": "IVS development creates a complex trade-off between food security and disease burden, mediated by specific water management practices and local ecological context. The evidence base is fragmented, with a notable lack of longitudinal, interdisciplinary studies quantifying the direct health impacts.", "recommendations": "Future research must integrate entomological, epidemiological, and socio