Classical mechanisms of volcanic eruptions mostly involve pressure buildup and magma ascent towards the surface1. Such processes produce geophysical and geochemical signals that may be detected and interpreted as eruption precursors1–3. On 22 May 2021, Mount Nyiragongo (Democratic Republic of the Congo), an open-vent volcano with a persistent lava lake perched within its summit crater, shook up this interpretation by producing an approximately six-hour-long flank eruption without apparent precursors, followed—rather than preceded—by lateral magma motion into the crust. Here we show that this reversed sequence was most likely initiated by a rupture of the edifice, producing deadly lava flows and triggering a voluminous 25-km-long dyke intrusion. The dyke propagated southwards at very shallow depth (less than 500 m) underneath the cities of Goma (Democratic Republic of the Congo) and Gisenyi (Rwanda), as well as Lake Kivu. This volcanic crisis raises new questions about the mechanisms controlling such eruptions and the possibility of facing substantially more hazardous events, such as effusions within densely urbanized areas, phreato-magmatism or a limnic eruption from the gas-rich Lake Kivu. It also more generally highlights the challenges faced with open-vent volcanoes for monitoring, early detection and risk management when a significant volume of magma is stored close to the surface.

AbstractWe track the effects of the COVID-19 pandemic on mental health in eight Low and Middle Income Countries (LMICs) in Asia, Africa, and South America utilizing repeated surveys of 21,162 individuals. Many respondents were interviewed over multiple rounds pre- and post-pandemic, allowing us to control for time trends and within-year seasonal variation in mental health. We demonstrate how mental health fluctuates with agricultural crop cycles, deteriorating during pre-harvest “lean” periods. Ignoring this seasonal variation leads to unreliable inferences about the effects of the pandemic. Controlling for seasonality, we document a large, significant, negative impact of the pandemic on mental health, especially during the early months of lockdown. In a random effects aggregation across samples, depression symptoms increased by around 0.3 standard deviations in the four months following the onset of the pandemic. The pandemic could leave a lasting legacy of depression. Absent policy interventions, this could have adverse long-term consequences, particularly in settings with limited mental health support services, which is characteristic of many LMICs.

Food security is challenged by low agricultural productivity in eastern Democratic Republic of Congo (DRC). This study aimed at contributing to food security of rural households in South-Kivu by valorizing residues of four staple crops, including cassava, maize, banana, and common bean. The study was conducted in two steps: (1) monitoring of farmers' fields throughout the cropping season to record weight of crop residues and yields, and (2) assessment of the potential of staple crop residues for mushroom ( Pleurotus ostreatus ) production. Results showed that the four major staple crops had low yields and low biomass productivity in the study area. Residues of these staple crops were mainly used by farmers as fodder, compost, incinerated, or left on the farm for nutrient recycling. In addition to target plant parts (tubers or grains), cassava and common bean leaves were harvested for household consumption (as vegetables) or traded at local markets for income generation. Substrates based on maize residues, combined with cow manure as additive, gave the highest yield of P. ostreatus (2.4 kg kg −1 ) compared to residues of other three staple crops. In contrast, substrates from banana leaves had consistently lowest yields, regardless of used additives (1.1 and 1.2 kg kg −1 with soybean flour and cow manure, respectively). This study showed that valorizing residues of staple crops could help improve households’ food security and income in rural areas of eastern DRC. This practice should, therefore, be encouraged and scaled across the country and other parts of the world facing food shortages and poverty. • Food insecurity and poverty in rural South-Kivu are mainly linked with low crop productivity. • Options for valorizing crop residues could be instrumental for food security and poverty alleviation. • Mushroom production is a cost-effective and profitable option in valorizing staple crops residues. • Scaling mushroom production would economically empower rural households and reduce pressure on natural resources in South-Kivu.

Despite calls forincreased mental health programming in low-resource and humanitarian contexts and effectiveness trials of psychotherapy in these settings, little research exists on the extent to which providers and recipients continue to practice skills learned during trials of these programs. To understand if and how providers continued to use mental health intervention skills without ongoing institutional support following the completion of randomized controlled trials (RCTs), we analyzed data from semistructured interviews with six of seven providers who participated in an RCT of cognitive processing therapy (CPT) in the Democratic Republic of Congo 7 years prior. Provider interviews revealed continued knowledge of and, in some cases, the practice of core CPT skills as well as efforts to keep meeting with women in the community and a strong desire to learn new skills. Although financial limitations sometimes prohibited providers from formally convening CPT groups with women in need, participants maintained knowledge and skill use. Providers also reported feeling more valued in their communities, and they continued providing services beyond the planned intervention period despite a lack of ongoing support. In addition, participants described a strong desire to continue psychosocial interventions for trauma and learn more about this type of intervention. Reframing the evaluation of psychological interventions as program development and maintaining a strong working relationship with community partners may allow for increased sustainability of mental health services beyond the end of academic research studies in low-resource contexts.

AbstractFreshwater ecosystems provide many services such as moderation of the local microclimate and a source of water and food for riparian communities. It is also a preferred habitat for many organisms such as plankton, benthic macroinvertebrates and fish. However, these ecosystems are among the most affected by various anthropogenic threats that modify water quality and ecological processes, thus affecting biodiversity. The objective of this study was the spatio‐temporal characterization of physico‐chemical littoral water parameters and the assessment of anthropogenic disturbance on the littoral zone by a water quality index (WQI). Physico‐chemical water quality data including temperature, dissolved oxygen, conductivity, pH, TDS, turbidity, SiO2, PO43−, NO2−, and NH4+ were collected from January to December 2018. They were used to calculate the WQI to assess water quality according to aquatic life, using limits values of Canadian Council of Ministers of the Environment (CCME), United States Environmental Protection Agency (USEPA) and Australian and New Zeland Environment and Conservation Council (ANZECC). PO43− is out of range in all the stations while NO2− and Turbidity are out of range in some of the anthropized stations according to ANZECC, CCME, and USEPA recommended values for aquatic life. The WQI values range from medium to good and the high WQI values obtained in the non‐anthropized stations that reflect the negative influence of human disturbance on water quality in the Lake littoral zone. The results suggest the need for an integrated lake watershed management system in order to maintain the ecological functions of the lake and support livelihoods from the lake.

The boom of the humanitarian and development industry in eastern Democratic Republic of the Congo (DRC) and the demand for qualitative and quantitative research that has accompanied it have created a novel political economy of academic research in the region. An array of research associations and private data collection firms have emerged to respond to the international demand by Western universities and research projects. Like many industries operating on the continent, academic research has a racial dimension, which is rarely reflected upon, in part because it is often invisible to white Western researchers. This paper reflects on the creation and evolution of a non-profit association specialized in the collection of data in conflict-affected areas of eastern DRC. The research association was conceived by its Congolese and European founders as an enclave against the racism that pervades professional relations in the region, an experiment upheld by a collective commitment to academic research and an egalitarian ethos. Written from the perspective of three of its founding members, this paper analyses how racialized discursive repertoires and cognitive biases (re)appeared within the organization. We argue that these repertoires and biases serve to activate a particular mode of production, based on racial and geographic inequalities in working conditions and prospects. We interrogate the relationship between race and the system of production underpinning contemporary research, and show that, far from solely being a remnant of the colonial era, race constitutes a resource that can be tapped into, particularly in a context where empirical data, competition for funding, and ‘value for money’ are increasingly becoming the norm.

BackgroundEctomycorrhizal (EcM) fungi constitute a source of income as well as proper food with considerable nutritional value. Although edible EcM fungi are highly diverse and expected to host considerable nutritional attributes, only few studies focus on their use and promotion in the province of Tshopo (DR Congo). This study provides original ethnomycological and diversity data on edible ectomycorrhizal rainforest fungi from the Man-and-Biosphere reserve of Yangambi and the reserve of Yoko.MethodsThe list of edible fungi follows the current taxonomy. Taxa were collected in plots situated in different types of rainforests. Each taxon is supported by herbarium reference specimens. Ethnomycological data on locally consumed EcM fungi were collected from randomly selected people living near the Man-and-Biosphere reserve of Yangambi and the Yoko reserve. People were interviewed using a semi-structured questionnaire. The interview campaign involved 160 informants, all randomly selected from 6 different ethnic communities.ResultsThe results reveal that rainforests from the Yangambi Biosphere reserve and Yoko forest reserve provide a relatively high number of edible fungi, more than local people actually use. Mixed forest stands hold the highest diversity in saprotrophic edible fungi (p value < 0.001) while no significant difference (p value > 0.05) was observed in the number of saprotrophic and EcM fungi within monodominant forests. In spite of being accessible, this renewable natural resource is underexploited. Although a wide array of EcM fungi is available in primary forests dominated by ectomycorrhizal trees, local people’s major interest goes to the saprotrophic fungi from areas with degraded mixed forests.ConclusionThe lack of local interest for EcM fungi is probably related to the considerable distance people have to cover to collect them. As a result, the edible EcM fungi from the Tshopo area represent a potentially interesting but underutilized resource.

Goma city, at the eastern border of DRCongo, is highly exposed to natural hazards, especially from Nyiragongo volcano, located directly North of it. In January 2002, the city centre of Goma was devastated by lava flows and several thousands of people were temporarily displaced. Defining and quantifying population vulnerability to natural hazards, and lava flow hazards in particular, is a crucial element to evaluate and manage the risk. This paper aims at assessing the vulnerability of the population facing volcanic hazards in Goma, and its spatial variation across the city, in order to support volcanic risk prevention and management at the local levels. In this data scarcity context, two parallel methodologies are tested based on data collected through a large-scale household survey: the Social Vulnerability Index (SoVI) as defined by Cutter et al. (2003) based on a statistical data reduction; the other using fewer significant indicators in order to develop an Operational Vulnerability Index (OVI). Results show that the spatial distribution of the vulnerability levels with both approaches is quite similar, but the construction of an OVI can help to communicate the message more easily to political authorities for risk management actions – e.g., to target neighborhoods where to develop priority prevention programs – but also in terms of spatial urban planning – e.g., to identify areas where to act. Population vulnerability assessment, together with the lava flow hazard invasion probability and population exposure, is one of the crucial steps towards the lava flow risk assessment.

BackgroundWild mushrooms constitute an important non-timber forest product that provides diverse substances and services, especially food and income for local communities from many parts of the world. This study presents original ethnomycological documentation from the dense rainforests of the Democratic Republic of the Congo.MethodsEthnomycological surveys were made within local communities near the biosphere reserve of Yangambi and the Yoko forest reserve. The interviews involved 160 informants from six different ethnic communities (Bakumu, Turumbu, Topoke, Lokele, Ngelema, and Ngando). Specific reported use (RU), the relative importance (RI), and the cultural significance (CS) of wild edible fungi were calculated using quantitative data from enquiries.ResultsThe people from Tshopo use 73 species of wild mushrooms either for food (68 species), as medicine (9 species), in a recreational context (2 species), or related to myths and beliefs (7 species). Women are more involved in harvesting and are the main holders of cultural aspects related to fungi. The results show that knowledge of useful mushrooms differs between ethnic groups. The Ngando people have the highest ethnomycological expertise, which is expressed in their extensive cultural and practical use of fungi. Pleurotus tuber-regium is the most important species (MCSI = 1.9 and p value < 2.2e−16) as it is being used for food, as a medicine, and more. Daldinia eschscholtzii is the most important (MUI = 0.86 and p value < 2.2e−16) for medicinal applications, while Schizophyllum commune, Auricularia cornea, A. delicata, Marasmius buzungolo, and Lentinus squarrosulus are mostly appreciated for food. The latter five species are all wood-decaying saprotrophs.ConclusionDespite the presence of edible ectomycorrhizal taxa in the dense rainforests of Tshopo, local people only seem to have an interest in saprotrophic taxa. Some mushroom pickers deliberately cut down host trees to promote the development of saprotrophic taxa. Inducing forest degradation is considered beneficial as it promotes the development of saprotrophic taxa. The domestication of locally appreciated saprotrophic lignicolous fungi is proposed as a mitigating measure against fellings.

Anemia is a worldwide public health concern especially in preschool children in developing countries and iron deficiency (ID) is generally assumed to cause at least 50% of the cases. However, data on this contribution are scarce. To close this gap, we determined in 2013 the contribution of ID in the etiology of anemia and measured others factors associated to noniron deficiency anemia (NIDA) in 900 preschool children randomly selected during a two-stage cluster nutritional survey in the Miti-Murhesa health zone, in eastern Democratic Republic of the Congo. In these children, we collected sociodemographic, clinical, and biological parameters and determined the nutritional status according to the World Health Organization 2006 standards. Anemia was defined as altitude-adjusted hemoglobin < 110 g/L and ID was defined as serum ferritin < 12 μg/L or < 30 μg/L in the absence or presence of inflammation, respectively. Median (interquartile range) age was 29.4 (12-45) months. The prevalence of anemia was 46.6% (391/838) among whom only 16.5% (62/377) had ID. Among children without signs of inflammation, only 4.4% (11/251) met the ferritin-based (unadjusted) definition of ID. Logistic regression analysis identified ID, history of fever during the last 2 weeks and mid-upper arm circumference < 125 mm as the only independent factors associated to anemia. In conclusion, anemia is a severe public health problem in the Miti-Murhesa health zone, but NIDA is mostly predominant and needs to be further studied. Control of infections and prevention of acute undernutrition (wasting) are some of appropriate interventions to reduce the burden anemia in this region.