Effects of drought ? altered seasonality and low rainfall ? in net ecosystem carbon exchange of three contrasting Mediterranean ecosystems

International audienceDroughts cause reductions in gross primary production (GPP) and also in net ecosystem exchange (NEE), contributing to most of the inter-annual variability in terrestrial carbon sequestration. In seasonally dry climates (Mediterranean) droughts result from reductions in annual rainfall and from changes in rain seasonality. In western Iberia, the hydrological-year (i.e., from October to September) of 2004?2005 was extremely dry, with precipitation 50% below the long-term mean (691 mm in 1961?1990), but 2005?2006 was normal. We compared the carbon fluxes measured by the eddy covariance technique from three contrasting ecosystems in southern Portugal: an evergreen oak woodland (savannah-like) with ca. 21% tree cover; a Mediterranean C3/C4 grassland; and a coppiced eucalyptus plantation. During the dry hydrological-year of 2004?2005, NEE was lowest, the highest sink strength was in the eucalypt plantation (NEE = ?399 g C m ?2 year?1) as compared to the oak woodland (NEE = ?88 g C m ?2 year?1), and the grassland (NEE = +49 g C m ?2 year ?1). The latter was a source of carbon dioxide. The NEE values of the dry year were, however, much lower than those for wetter years, e.g. NEE = ?861 g C m?2 year ?1 in 2002?2003 in the eucalypt plantation. The NEE of the grassland and the oak savannah in the 2005?2006 hydrological-year, with annual precipitation above the long term mean, were ?190 and ?120 g C m ?2 year?1, respectively. All ecosystems studied increased their rain-use efficiency (GPP per unit of rain volume) increased in dry years. In the case of annual vegetation ? grassland and low tree density woodland, however &ndash, rain-use efficiency decreased with severe drought. However, this was more pronounced in the eucalypt plantation due to greater GPP and the use of deep soil water resources. Although both calendar years of 2004 and 2005 had equally low rainfall, the effect of drought on the eucalypt plantation was delayed until the second dry year. This suggests that the effects of water deficits on Mediterranean forests are exacerbated by prolonged droughts when long-term soil water reserves are depleted. The grassland, however, was more vulnerable and responded faster to water deficits. This effect of drought was less pronounced in the oak woodland due to the sparse tree cover

Net ecosystem carbon exchange in three contrasting Mediterranean ecosystems ? the effect of drought

International audienceDroughts reduce gross primary production (GPP) and ecosystem respiration (Reco), contributing to most of the inter-annual variability in terrestrial carbon sequestration. In seasonally dry climates (Mediterranean), droughts result from reductions in annual rainfall and changes in rain seasonality. We compared carbon fluxes measured by the eddy covariance technique in three contrasting ecosystems in southern Portugal: an evergreen oak woodland (savannah-like) with ca.~21% tree crown cover, a grassland dominated by herbaceous annuals and a coppiced short-rotation eucalyptus plantation. During the experimental period (2003?2006) the eucalyptus plantation was always the strongest sink for carbon: net ecosystem exchange rate (NEE) between ?861 and ?399 g C m?2 year?1. The oak woodland and the grassland were much weaker sinks for carbon: NEE varied in the oak woodland between ?140 and ?28 g C m?2 year?1 and in the grassland between ?190 and +49 g C m?2 year?1. The eucalyptus stand had higher GPP and a lower proportion of GPP spent in respiration than the other systems. The higher GPP resulted from high leaf area duration (LAD), as a surrogate for the photosynthetic photon flux density absorbed by the canopy. The eucalyptus had also higher rain use efficiency (GPP per unit of rain volume) and light use efficiency (the daily GPP per unit incident photosynthetic photon flux density) than the other two ecosystems. The effects of a severe drought could be evaluated during the hydrological-year (i.e., from October to September) of 2004?2005. Between October 2004 and June 2005 the precipitation was only 40% of the long-term average. In 2004?2005 all ecosystems had GPP lower than in wetter years and carbon sequestration was strongly restricted (less negative NEE). The grassland was a net source of carbon dioxide (+49 g C m?2 year?1). In the oak woodland a large proportion of GPP resulted from carbon assimilated by its annual vegetation component, which was strongly affected by the shortage of rain in winter. Overall, severe drought affected more GPP than Reco leading to the deterioration of NEE. Although the rain-use efficiency of the eucalyptus plantation increased in the dry year, this was not the case of evergreen oak woodland, which rain-use efficiency was not influenced by drought. Recovery after drought alleviation, i.e., beginning with heavy rain in October 2005, was fully accomplished in 2006 in the oak woodland and grassland, but slow in the eucalyptus plantation

The Effect of a Surgery Residency Program and Enhanced Educational Activities on Trauma Mortality in Sub-Saharan Africa

Introduction: To address the need for more surgical providers in low-resource settings, a collaboration to create a surgical residency-training program for local Malawian physicians was established in 2009. This study sought to describe the short-term independent effect of a surgical residency program on trauma mortality at a tertiary trauma center in sub-Saharan Africa. Methods: We conducted a retrospective analysis of all patients recorded in the trauma surveillance registry of Kamuzu Central Hospital in Lilongwe, Malawi, from 2009 (three residents) through 2014 (11 residents). Log-binominal regression modeling was used to compare the risk ratio of death compared to the referent year of 2009, when the program was started, after adjusting for relevant covariates. Primary injury type was used as a surrogate for injury severity. Results: In total, 82,534 patients were recorded into the KCH Trauma Registry during the study period. Mean age was 23.1 years (SD 15.7) with a male preponderance (72.1%). Trauma patient volume increased from 8725 patients in 2009 to 15,998 patients in 2014. Each year had a significantly decreased risk of death compared to 2009 when adjusted for primary injury type, age, and gender, with an adjusted risk ratio of 0.73 (95% CI 0.58, 0.90) in 2010 and 0.52 (95% CI 0.43, 0.62) in 2014. Conclusion: The global burden of surgical diseases cannot be attenuated in the presence of an inadequate surgical workforce. After institution of a surgery residency program, adjusted injury-associated mortality decreased each year despite substantial increases in trauma patient volume. In low-resource settings, establishment of a surgical residency program significantly improves trauma-associated outcomes

Paediatric road traffic injuries in Lilongwe, Malawi: an analysis of 4776 consecutive cases

This was a retrospective review of all children aged ≤16 who were treated in the casualty department at the central hospital in Lilongwe, Malawi, between 1 January 2009 and 31 December 2015. A total of 4776 children were treated for road traffic injuries (RTIs) in the study period. There was an increase in incidence from 428 RTIs in 2009 to a maximum of 834 in 2014. Child pedestrians represented 53.8% of the injuries, but 78% of deaths and 71% of those with moderate to severe head injuries. Pedestrians were mostly injured by cars (36%) and by large trucks, buses and lorries (36%). Eighty-four (1.8%) children were brought in dead, while 40 (0.8%) children died in the casualty department or during their hospital stay. There has been a drastic increase of RTIs in children in Lilongwe, Malawi. Child pedestrians were most affected, both in terms of incidence and severity

Wildfire alters the structure and seasonal dynamics of nocturnal pollen‐transport networks

Wildfires drive global biodiversity patterns and affect plant–pollinator interactions, and are expected to become more frequent and severe under climate change. Post-fire plant communities often have increased floral abundance and diversity, but the effects of wildfires on the ecological process of pollination are poorly understood. Nocturnal moths are globally important pollinators, but no previous study has examined the effects of wildfire on nocturnal pollination interactions. We investigated the effects of wildfire on nocturnal pollen-transport networks. We analysed the abundance and species richness of moths and flowers, and the structure of these networks, at three burned and three unburned sites in Portugal for two years, starting eight months after a large fire. Nocturnal pollen-transport networks had lower complexity and robustness following the fire than at nearby unburned sites. Overall, 70% of individual moths carried pollen, and moths were found to be transporting pollen from 83% of the flower species present. Burned sites had significantly more abundant flowers, but less abundant and species-rich moths. Individual moths transported more pollen in summer at burned sites, but less in winter; however, total pollen transport by the moth assemblage at burned sites was just 20% of that at unburned sites. Interaction turnover between burned and unburned networks was high. Negative effects of fire upon moths will likely permeate to other taxa through loss of mutualisms. Therefore, if wildfires become more frequent under climate change, community resilience may be eroded. Understanding the responses of ecological networks to wildfire can inform management that promotes resilience and facilitates whole-ecosystem conservation

Characterization of Mine Wastes as a Potential Source of Heavy Metals Propagation to Nearby Soils (Case of the Former Kipushi Concentrator)

This paper is the result of a research study to characterise the tailings piles of the former Kipushi concentrator in D. R. Congo, stocked for more than 50 years in an opened park, as a potential source for the dissemination of heavy metals in the surrounding soils

Etiology of major limb amputations at a tertiary care centre in Malawi

Introduction Amputations in low-and middle-income countries (LMICs) represent an important cause of disability and economic hardship. LMIC patients are young and suffer from preventable causes, such as trauma and trauma-related infections. We herein studied the etiology in amputations in a Malawian tertiary care hospital over a 9-year period. Methods Operative and anaesthesia logs at Kamuzu Central Hospital (KCH) in Lilongwe, Malawi, were reviewed for 2008–2016. Baseline demographic and clinical variables and type of amputation performed were collected. Only major limb amputations, defined as above or below the knee, above or below the elbow, and above the wrist, were included in this study. Results A total of 610 patients underwent 630 major amputations during the study period. Of these, 170 (27%) patients were female, and the median age of the cohort was 39 (interquartile range [IQR] 25–55). Of these patients, 345 (54.8%) had infection or gangrene recorded among the indications for amputation, 203 (32.2%) had trauma, 94 (14.9%) had cancer and 67 (10.6%) had documented diabetes. Women underwent diabetes-related amputations more often than men (37 out of 67, or 56.1%), and were significantly younger when their amputations were due to diabetes (median age 48 vs 53 years old, P=0.004) or trauma (median age 21 vs 30 years old, P=0.02). The commonest operative procedures were below the knee amputations, at 271 (43%), and above the knee amputations, at 213 (33.8%). Conclusion Amputations in Malawi affect primarily the young, in the most economically productive time of their lives, in contrast to amputees in high-income countries. Preventable causes, such as infection and trauma, lead to the majority of amputations. These etiologies represent an important primary prevention target for public health efforts in LMICs

Short-term positive effects of wildfire on diurnal insects and pollen transport in a Mediterranean ecosystem

Climatechangeisakeydriverofincreasedwildfireactivityglobally.Whilst the recovery of plant communities after fire is generally understood, the impacts on ecological processes, such as pollen transport by insects, have received little attention. We investigated the effects of wildfire on diurnal insects and pollen transport over 2 years following a large fire in Southern Portugal. By comparing samples collected at burned and adjacent unburned sites, we examined wildfire effects on (a) abundance and species richness of insects across seasons, (b) pollen being transported, (c) three of the most abundant species: Oxythyrea funesta, Heliothaurus ruficolis (both Coleoptera), and Apis mellifera (Hymenoptera). Wildfire and season had significant, interacting effects on the abundance of insects but not species richness. Abundance and species richness increased over time at both burned and unburned sites, most notably each spring. Pollen loads, and species richness, found on individual insects were significantly higher in burned sites in the first spring only, but generally increased with time after the wildfire. The abundance of O. funesta was similar between burned and unburned sites in the spring, but in the winter was significantly higher in burned sites; there were no significant differences in summer and autumn. H. ruficolis abundance was higher in burned sites. A. mellifera abundance was unaffected. Overall, across almost all the community metrics, our results suggest that wildfire affects pollen transport by diurnal insects, at least in the short term, but with time, these become similar to unburned habitats

Experience from a community-based education program in Burkina Faso: The Tostan program

This study describes a project that tested the feasibility and effectiveness of replicating the village empowerment program (VEP) developed by the Senegalese NGO, TOSTAN, in Burkina Faso. Although originally developed for empowering women, the program implemented in Burkina Faso also involved men because of their key role in such decisions. Frontiers in Reproductive Health, with funding from USAID and the GTZ Supra Regional Project for the Elimination of FGC, supported the adaptation, implementation, and evaluation of the VEP model in 23 villages in the province of Bazega/Zoundwéogo. In the existing social climate among the Burkinabé, where there is widespread awareness of the law forbidding FGC, the education program has contributed to strengthening the existing measures and to a significant improvement in the level of awareness of human rights and reproductive health

The rise in road traffic injuries in Lilongwe, Malawi: A snapshot of the growing epidemic of trauma in low income countries

Introduction: Road traffic injuries (RTIs) and death are a major public health issue worldwide. Unless appropriate action is taken urgently, the burden of RTIs will continue to increase globally. This will be particularly pronounced in developing countries where rapid motorization is likely to continue over the next decades. Malawi is one of these countries with a population of 17.2 million and a Gross National Income per capita of 340 US$. The impact of the rising burden of injury on the health sector is considerable. However, data to demonstrate this development is lacking. Methods: This study is an analysis of data from the Kamuzu Central Hospital (KCH) Trauma Registry. KCH is a 900-bed tertiary care public hospital in Lilongwe, the capital city of Malawi. The KCH Trauma Registry was established to collect patient demographic information, clinical characteristics, and outcome data for all patients presenting to the emergency department with injuries. All patients who presented to the emergency department with injuries between January 2009 and December 2015 were included in the study. Results: A 96,967 patients with injuries between 2009 and 2015 were registered in the KCH Trauma Registry. The mean age of these patients was 23.3 years and 36.8% were children younger than 18 years. 25,193 (26.2%) patients had road traffic related injuries, of these 19,244 (76.4%) were men. There was a 62.4% rise in the number of RTI victims treated at KCH from 2447 in 2009–3975 in 2015. If this trend continues, 7997 patients will be expected to need treatment for RTIs at KCH in 2030, doubling the numbers seen in 2015 in just 15 years. The highest number of injuries occurred in pedestrians (32.3%) and cyclists (28.2%) and continually rose over the years studied. The length of hospital stay for RTIs increased from 6.4 ± 9.1days in 2009 to 15.0 ± 19.4 in 2015. Discussion: There was a rapidly growing burden of RTIs at KCH in Lilongwe, Malawi, between 2009 and 2015, and projections based on our data show that this burden will double by 2030. It is essential that surgical trauma services are scaled up to meet this challenge in Malawi. There is also a large potential for prevention of injuries involving vulnerable road users. Road traffic campaigns should focus on improved driver training, use of lights, pedestrian and cyclist visibility, and vehicle fitness. Standards should include physical separation of pedestrians and vehicles, through raised pavements or separate walk and cycle ways. The absence of a clear strategy to meet the growing epidemic of injuries in Malawi will come at a huge cost to an already strained economy, and the largest portion of the burden of injury will continue to be borne by the poorest segment of the population