One of the principles guiding the conduct of Nigeria’s foreign policy is Afrocentrism. The concept of Nigeria’s Afrocentric policy embodies two intertwined ideas. First, it is designed to advance the interest and wellbeing of African countries through different intra and extra-African diplomatic channels. Second, the reason for embracing a representative function on behalf of Africa in global forums and the enormous sacrifices undertaken in the process is to enhance Nigeria’s status as Africa’s undisputed leader. The exploits and sacrifices in the pursuit of the policy notwithstanding, Nigeria has had to endure some disappointments and inconveniences. Going forward, this article contends that the philosophies underlying the policy must be reconsidered. In the uncertain world of diplomacy where empathy and benevolence are not always rewarded, Nigeria must embrace an ‘imperialistic’ agenda in its foreign policy calculations towards Africa.
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Arsenic (As), iron (Fe), and manganese (Mn) contents were measured in sediment nodules and associated pore waters obtained from sediment cores collected from a salt marsh on Pólvora Island (southern Brazil). Sediment cores were obtained when brackish water dominated the estuary, at two different environments: an unvegetated mudflat colonized by crabs (Neohelice granulata), and a low intertidal stand vegetated by Spartina alterniflora. We determined the percentage of nodules in each depth interval of the cores, along with redox potential, and As, Fe, and Mn contents of the nodules. The mineralogy of the nodules was investigated, and results showed they are mainly composed by quartz, phyllosilicates, and amorphous Fe–Mn oxides/oxyhydroxides. Pore water results showed that bioturbation by local crabs supports oxygen penetration to depths of ca. 25 cm below the salt marsh surface, with lower Fe contents in pore water associated with the brackish period. However, S. alterniflora growth appears to have a greater impact on sediment geochemistry of Fe, Mn, and possibly As due to sulfate reduction and the associated decrease in pore water pH. Higher Fe concentrations were observed in the pore waters during the period of brackish water dominance, which also corresponded to the S. alterniflora growth season. The study demonstrates that differences in geochemical conditions (e.g., Fe content) that can develop in salt marsh sediments owing to different types of bioirrigation processes (i.e., bioirrigation driven by crabs versus that related to the growth of S. alterniflora) play important roles in the biogeochemical cycling of As.
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