Pyrethroid and etofenprox resistance in Anopheles gambiae and Anopheles coluzzii from vegetable farms in Yaounde, Cameroon: dynamics, intensity and molecular basis

Previous studies have indicated widespread insecticide resistance in malaria vector populations from Cameroon. However, the intensity of this resistance and underlying mechanisms are poorly known. Therefore, we conducted three cross-sectional resistance surveys between April 2018 and October 2019, using the revised World Health Organization protocol, which includes resistance incidences and intensity assessments. Field-collected Anopheles gambiae s.l. populations from Nkolondom, Nkolbisson and Ekie vegetable farms in the city of Yaounde were tested with deltamethrin, permethrin, alpha-cypermethrin and etofenprox, using 1x insecticide diagnostic concentrations for resistance incidence, then 5x and 10x concentrations for resistance intensity. Subsamples were analyzed for species identification and the detection of resistance-associated molecular markers using TaqMan(R) qPCR assays. In Nkolbisson, both An. coluzzii (96%) and An. gambiae s.s. (4%) were found together, whereas only An. gambiae s.s. was present in Nkolondom, and only An. coluzzii was present in Ekie. All three populations were resistant to the four insecticides (<75% mortality rates-MR1x), with intensity generally fluctuating over the time between mod-erate ( /=98%-MR10x) and high (76-97%-MR10x). The kdr L995F, L995S, and N1570Y, and the Ace-1 G280S-resistant alleles were found in An. gambiae from Nkolondom, at 73%, 1%, 16% and 13% frequencies, respectively, whereas only the kdr L995F was found in An. gambiae s.s. from Nkolbisson at a 50% frequency. In An. coluzzii from Nkolbisson and Ekie, we detected only the kdr L995F allele at 65% and 60% frequencies, respectively. Furthermore, expression levels of Cyp6m2, Cyp9k1, and Gste2 metabolic genes were highly upregulated (over fivefold) in Nkolondom and Nkolbisson. Pyrethroid and etofenprox-based vector control interventions may be jeopardized in the prospected areas, due to high resistance intensity, with multiple mechanisms in An. gambiae s.s. and An. coluzzii

Community Capacity for Implementing Clean Development Mechanism Projects Within Community Forests in Cameroon

There is a growing assumption that payments for environmental services including carbon sequestration and greenhouse gas emission reduction provide an opportunity for poverty reduction and the enhancement of sustainable development within integrated natural resource management approaches. Yet in experiential terms, community-based natural resource management implementation falls short of expectations in many cases. In this paper, we investigate the asymmetry between community capacity and the Land Use Land Use Change Forestry (LULUCF) provisions of the Clean Development Mechanism within community forests in Cameroon. We use relevant aspects of the Clean Development Mechanism criteria and notions of “community capacity” to elucidate determinants of community capacity needed for CDM implementation within community forests. The main requirements are for community capacity to handle issues of additionality, acceptability, externalities, certification, and community organisation. These community capacity requirements are further used to interpret empirically derived insights on two community forestry cases in Cameroon. While local variations were observed for capacity requirements in each case, community capacity was generally found to be insufficient for meaningful uptake and implementation of Clean Development Mechanism projects. Implications for understanding factors that could inhibit or enhance community capacity for project development are discussed. We also include recommendations for the wider Clean Development Mechanism/Kyoto capacity building framework

British ‘Colonial governmentality’: slave, forced and waged worker policies in colonial Nigeria, 1896–1930

“This is an Accepted Manuscript of an article published by Taylor & Francis in Management & Organizational History on 22 Apr 2019, available online: https://doi.org/10.1080/17449359.2019.1578669

Balancing politics, economics and conservation: the case of the Cameroon forestry law reform

The formulation of Cameroon's 1994 Forestry Law was influenced by the World Bank, the Government of Cameroon and French politicians, as well as by logging companies and individual Cameroonian politicians. Development objectives, direct material interests and political concerns motivated their actions. However, as the result of a flawed formulation process, conflicting interests and weak government administrative capacity, the law has not been fully implemented and may not be. An analysis of the 1994 Forestry Law suggests that the success of future policies will depend on the willingness of actors to defend their interests, the balance of power at the time, and the ability of the Executive Branch to mediate among the different interests in each case

Making the law of the jungle: the reform of forest legislation in Bolivia, Cameroon, and Indonesia

The debates over sustainable development put environmental issues squarely on the policy agendas of nations around the world. Throughout, the fate of the forest occupied center stage, and domestic and international pressure induced many developing nations to reform their forest policy, which frequently culminated in new forest legislation. Yet the process that generated those new forest laws has not received much attention and a number of questions remain unanswered. What factors determine whether governments reform forest laws in the first place? What conditions influence the direction of reform? What role does expert advice play in the process? This paper applies a political economy framework that focuses on the interplay between international structure, domestic structure and ideas to answer those questions. It argues that this approach offers the best tools for analyzing the actors and interests involved in the policy process and their power resources. Among the most significant findings are that the World Bank is not as influential in the end as is commonly perceived. Moreover, in democratic developing countries organizations that focus almost exclusively on cultivating their relationship with state ministries to influence forest policy reform usually see their efforts flounder because the legislature, especially legislative committees, is a more significant policy making arena than had been considered here before

Influence of biotic vs abiotic processes on the genesis of non-marine carbonates along the Cameroon Volcanic Line (Cameroon) and palaeofluid provenance

Continental spring carbonates are perfect examples of the interaction of biotic and abiotic processes, and they preserve evidence of the velocity of the flow and the chemical composition of the spring water. This study focuses on non-marine carbonates from fossil and active springs from the Bongongo and Ngol areas along the Cameroon Volcanic Line in South-West Cameroon. Here, hydrothermal fluids reach the surface giving rise to small thermal springs, with temperatures between 31 and 49°C, and streams creating waterfalls, terracettes and barrage carbonate deposits. Petrographic analyses of these carbonates revealed that they are made up of stacked laminae of fibrous coarse crystals of low-Mg calcite and laminae of alternate microsparite and micrite. The fibrous coarsely crystalline calcite, often with feather-like fabric, grows from thin layers of micrite and peloids. Filaments of putative microbial origin are preserved within this peloidal micrite. The laminated microsparite and micrite microfacies is characterised by an intricate mesh of hollow filaments of microbial origin. The long feather-like crystals of calcite formed in fast-flowing water where the enhanced CO2 degassing has favoured the precipitation of CaCO3. The laminated micrite and microsparite, on the other hand, are probably formed in ponds where degassing and CO2 removal was lower and the calcite precipitation was fostered by microbial activity. The fast-forming carbonates show higher Ce contents and very low total rare earth elements, revealing a preferential uptake of Ce with respect to other rare earth elements. This process would explain the positive or null Ce anomaly in continental spring carbonates elsewhere. The geochemical composition of these carbonates can be used as proxy for the characterisation of fluid/rock interactions between the groundwater and the substratum and for the characterisation of the sources of calcium and other elements that constitute tufa and travertines. The samples from Ngol are characterised by light rare earth element enrichment while those from Bongongo are overall enriched in heavy rare earth elements. Carbonates from both localities have a strong positive Eu anomaly (&gt;4), suggesting a contribution from deep-seated, hydrothermal, crustal fluids in contact with volcanic rocks and the breakdown of plagioclase from the Cameroon Volcanic Line alkali basalts

Organic petrography and trace element geochemistry of organic black shales in the Kribi Campo sub-Basin, West Africa: Implication for petroleum source rock evaluation and depositional environment

The aim of this study was to characterise the maceral properties, depositional environment and petroleum source rock properties of black shales deposits of the lower Mundeck Formation of the Douala Kribi Campo sub-basin from organic petrography and trace element geochemical studies. The study showed that the Kribi Campo shales are typically dominated by the liptinite group of macerals, followed by vitrinite and the inertinite group respectively. The liptinite group is primarily represented by lamalginite, bituminite and solid bitumen, while vitrinite consists primarily of collotelinite, vitrodetrinite, and corpogelinite. The inertinite maceral group is the least abundant and is represented by fusinite, semifusinite, pyrolytic carbon, funginite and inertodetrinite. The constituents of the maceral in the shales point to a type II and III kerogen which are proficient of generating oil and gas. Based on vitrinite reflectance, the shales may be classified as being subbituminous A/B to subbituminous and A/high volatile bituminous C in rank. In terms of petroleum production, these shales are regarded as thermally immature with an indicated Tmax temperature (from programmed pyrolysis) of 421 °C.Trace element ratios of Sr/Ba for the studied shales shows values between 0.18 to 0.34 indicating that the shales were deposited in both fresh water and estuary environment. The estuary environment may have resulted from marine contamination to fresh water environment as this is seen only in one shale sample. The V/Ni and V/V+Ni ratio of the studied shales is >1 and ranges from 0.60–0.94 respectively, revealing their deposition in an anoxic environment

Politico-Economic Determinants of Forestry Policy in Cameroon

Factors that influence the policy choices of forest and environmental policy-makers in developing countries are yet to be completely understood. The study reported in this paper seeks to contribute to efforts addressed to promoting knowledge of these factors. It does so by analyzing the forest and environmental policy and policy field of Cameroon. The field is shown to be crowded, involving entities and individuals with disparate goals. The state emerges as the most powerful stakeholder in the field. It is argued that despite their seemingly inconsistent and contradictory nature, major provisions of Cameroon’s forestry and environmental policy have a unified purpose, viz., to serve the interests of powerful domestic and international stakeholders. It is concluded that the interests of these stakeholders, rather than the country’s national development goals, constitute the major determinant of the policy choices of its forest and environmental policy-makers