Floristic evidence for alternative biome states in tropical Africa.

The idea that tropical forest and savanna are alternative states is crucial to how we manage these biomes and predict their future under global change. Large-scale empirical evidence for alternative stable states is limited, however, and comes mostly from the multimodal distribution of structural aspects of vegetation. These approaches have been criticized, as structure alone cannot separate out wetter savannas from drier forests for example, and there are also technical challenges to mapping vegetation structure in unbiased ways. Here, we develop an alternative approach to delimit the climatic envelope of the two biomes in Africa using tree species lists gathered for a large number of forest and savanna sites distributed across the continent. Our analyses confirm extensive climatic overlap of forest and savanna, supporting the alternative stable states hypothesis for Africa, and this result is corroborated by paleoecological evidence. Further, we find the two biomes to have highly divergent tree species compositions and to represent alternative compositional states. This allowed us to classify tree species as forest vs. savanna specialists, with some generalist species that span both biomes. In conjunction with georeferenced herbarium records, we mapped the forest and savanna distributions across Africa and quantified their environmental limits, which are primarily related to precipitation and seasonality, with a secondary contribution of fire. These results are important for the ongoing efforts to restore African ecosystems, which depend on accurate biome maps to set appropriate targets for the restored states but also provide empirical evidence for broad-scale bistability.

'What kind of life is this?' Diabetes related notions of wellbeing among adults in eastern Uganda and implications for mitigating future chronic disease risk.

BACKGROUND: Effective prevention and care for type 2 diabetes requires that people link healthy behaviours to chronic disease-related wellbeing. This study explored how people perceive current and future wellbeing, so as to inform lifestyle education. METHODS: Eight focus group discussions and 12 in-depth interviews were conducted in Iganga and Mayuge districts in rural Eastern Uganda among people aged 35-60 years in three risk categories (1) People with diabetes, (2) people at higher risk of diabetes (with hypertension or overweight) and (3) community members without diabetes. RESULTS: People define wellbeing in three notions: 1) Physical health, 2) Socio-economic status and 3) Aspirational fulfilment. Most people hold the narrower view of wellbeing that focuses on absence of pain. Most overweight participants did not feel their condition as affecting their wellbeing. However, for several people with hypertension, the pains they describe indicate probable serious heart disease. Some people with diabetes expressed deep worry and loss of hope, saying that 'thoughts are more bothersome than the illness'. Wellbeing among people with diabetes was described in two perspectives: Those who view diabetes as a 'static' condition think that they cannot attain wellbeing while those who view it as a 'dynamic' condition think that with consistent treatment and healthy lifestyles, they can be well. While many participants perceive future wellbeing as important, people without diabetes are less concerned about it than those with diabetes. Inadequate knowledge about diabetes, drug stock-outs in health facilities, unaffordable healthier food, and contradictory information were cited as barriers to future wellbeing in people with diabetes. CONCLUSIONS: To make type 2 diabetes prevention relevant to healthy people, health education messages should link current lifestyles to future wellbeing. Diabetes patients need counselling support, akin to that in HIV care, to address deep worry and loss of hope.

Factors influencing adherence to exclusive breast feeding among HIV positive mothers in Kabarole district, Uganda.

OBJECTIVE: To identify the factors influencing adherence to exclusive breast feeding (EBF) among HIV positive mothers in Kabarole district, Uganda. DESIGN: Cross-sectional study. SETTING: Kabarore district, western Uganda. SUBJECTS: HIV infected women attending for psychosocial support that adhered or did not adhere to EBF. MAIN OUTCOME MEASURES: We compared personal factors, influence from other people, barriers and supports towards adherence to EBF among 139 HIV infected women who adhered and among 139 women who did not adhere to EBF using univariate and multivariate analyses. RESULTS: The independent predictors of adherence to EBF are: having formal education (Adjusted Odds Ratio [AOR] 2.21, 95% confidence interval [CI] 1.01-4.84), knowledge of EBF as a method of preventing mother to child transmission of HIV (AOR 2.53, CI 1.11-5.75), attending at least four antenatal infant feeding counselling sessions (AOR 3.86, CI 1.82-8.19), attending at least six postnatal counselling sessions (AOR 12.52, CI 3.89-40.30), health workers being consulted for breastfeeding problems (AOR 13.11, CI 3.75-45.81), mothers thinking that they are able to produce enough milk (AOR 3.92, CI 1.74-8.84), initiation of breastfeeding within one hour of birth (AOR 10.17, CI 4.52-22.88), getting support from the father to EBF (AOR 5.27, CI 1.87-14.81) and getting support from the family to EBF (AOR 4.54, CI 2.09-9.84). CONCLUSION: In order to improve adherence to EBF there is need to: involve the family especially fathers in infant feeding counselling and education, target less educated mothers for more intense infant feeding counselling using appropriate methods, intensify education on benefits of EBF and on how to produce enough milk and to encourage mothers to attend regularly for ante-natal and post-natal care.