South-eastern Tanzania Research Articles

Towards Canine Rabies Elimination in South-Eastern Tanzania: Assessment of Health Economic Data.

An estimated 59000 people die annually from rabies, keeping this zoonosis on the forefront of neglected diseases, especially in the developing world. Most deaths occur after being bitten by a rabid dog. Those exposed to a suspect rabid animal should receive appropriate post-exposure prophylaxis (PEP) or risk death. However, vaccination of dogs to control and eliminate canine rabies at the source has been implemented in many places around the world. Here, we analysed the vaccination and cost data for one such campaign in the area surrounding and including Dar es Salaam, Tanzania and estimated the cost per dog vaccinated. We also estimated the cost of human PEP. We found that the cost per dog vaccinated ranged from $2.50 to $22.49 across districts and phases, with the phase average ranging from $7.30 to $11.27. These figures were influenced by over purchase of vaccine in the early phases of the programme and the significant costs associated with purchasing equipment for a programme starting from scratch. The cost per human PEP course administered was approximately $24.41, with the average patient receiving 2.5 of the recommended four vaccine doses per suspect bite. This study provides valuable financial insights into programme managers and policymakers working towards rabies elimination.

The seismotectonics of Southeastern Tanzania: Implications for the propagation of the eastern branch of the East African Rift

Seismicity patterns and focal mechanisms in southeastern Tanzania, determined from data recorded on temporary and permanent AfricaArray seismic stations, have been used to investigate the propagation direction of the Eastern branch of the East African Rift System southward from the Northern Tanzania Divergence Zone (NTDZ). Within the NTDZ, the rift zone is defined by three segments, the Eyasi segment to the west, the Manyara segment in the middle, and the Pangani segment to the east. Results show that most of the seismicity (~75%) extends to the south of the Manyara segment along the eastern margin of the Tanzania Craton, and at ~6–7° S latitude trends to the SE along the northern boundary of the Ruvuma microplate, connecting with a N–S zone of seismicity offshore southern Tanzania and Mozambique. A lesser amount of seismicity (~25%) is found extending from the SE corner of the Tanzania Craton at ~6–7° S latitude southwards towards Lake Nyasa. This finding supports a model of rift propagation via the Manyara segment to the southeast of the Tanzania Craton along the northern boundary of the Ruvuma microplate. However, given the limited duration of the seismic recordings used in this study, the possibility of another zone of extension developing to the south towards Lake Nyasa (Malawi) cannot be ruled out. Focal mechanisms along the boundary between the Victoria and the Ruvuma microplates and offshore southeastern Tanzania show a combination of normal and strike slip faulting indicating mainly extension with some sinistral motion, consistent with the mapped geologic faults and a clockwise rotation of the Ruvuma microplate.

Preliminary Report on Early Settlements and Archaeological Materials from Lindi Rural District, Lindi Region, Southeastern Tanzania

This paper presents a preliminary report based on a reconnaissance survey so as to create the basis for further archaeological research works. The reconnaissance was conducted along areas in Mipingo ward north of Lindi town in Lindi Rural district, Lindi Region, Southeastern Tanzania. The reconnaissance work’s main objective was to pinpoint Iron Working, Neolithic and stone industrial techno-complexes (for example, Later Stone Age, Middle Stone Age and Sangoan-like traditions). Specifically, the reconnaissance works sought to identify cultural traditions such as Iron Working, Neolithic as well as Stone Age sequences/facies; to document other cultural heritage resources (movable and immovable, fauna or flora) in the areas; and later on, as a long-term goal after a fully-fledged research is done (after several years of works), to undertake community involvement for conservation as well as carry out presentation of the cultural heritage assets in form of a satellite museum/museums to be linked with the University of Dares Salaam Museum under the Department of Archaeology and Heritage. Normal archaeological survey strategies were employed in the area. The spotted materials were collected and GPS locations were noted. The area showed some potential archaeological remains that merit intensive archaeological research works. Such archaeological materials include ruins, tombs, stone tools and two pieces of pottery. In terms of cultural traditions, there is evidence pointing to Stone Age people from early Stone Age represented by Acheulian Industrial techno-complex followed by Middle Stone Age and Later Stone Age people. Furthermore, though two pieces of pottery were recovered, further intensive works may help to justify Iron Working people lived there. Moreover, remains of a house foundation reported to have been a store of slaves implying to the fact that slavery was not only practiced in Bagamoyo, Zanzibar and other places already reported in Tanzania, but also as far as Southeastern Tanzania, in particular, at Mchinga II and Mchinga II village in Lindi region. The tomb at Namihodi hamlet, Mchinga I village and graves close to the house foundation at Mchinga II villages also justify stay of foreign people, possibly Persians and/or Arabs. Presence of remains of Mosques at Mchinga I and Mchinga II implied that Islam was practiced there about three hundred thousand years ago, a pattern firmly established at other places along coastal Tanzania areas like Kaole, Bagamoyo, Kunduchi, Mbweni, Kilwa and many more places. In addition, indigenous people still undertake their rituals in the area as shown at Mchinga II village and Kilangala A village. The reported ruins at Mchinga I, Mchinga II and Kilangala villages need further research so as to get further insights and undertake community conservation as desired by the proponent.

Management of fever among under-fives and utility of malaria rapid diagnostic test under reduced malaria burden in Rufiji District, Southeastern Tanzania

ABSTRACT Objective To investigate case management of fever among under-fives, performance and utility of malaria rapid diagnostic test (mRDT) under reduced malaria burden in Rufiji District, Southeastern Tanzania. Methods A quantitative cross sectional study was conducted at primary health facilities in Rufiji District from April to May 2012. Information on socio-demographic characteristics, history and duration of fever, fever measurement, clinical diagnosis and drugs prescribed were recorded. Parasitological malaria confirmation was done by mRDT and microscopy. Performance of mRDT and utility of mRDT results to guide on the management of malarial and non-malarial fevers were assessed. Results Of the 466 under-fives with fever, 111 (23.8%) were mRDT positive and 100 (21.5%) were microscopically positive for malaria. Sensitivity and specificity of mRDT were 90% [95% confidence interval (CI): 82.6%–94.5%] and 94.3% (95% CI: 91.4%–96.2%) respectively; overall diagnostic accuracy was 93.3% (95% CI: 91.1%–95.6%). A total of 130 (28.5%) under-fives received an antimalarial. Among them, 109 (83.8%) were mRDT positive while 21 (16.2%) were negative. Of the 100 under-fives with microscopic parasitaemia, 34 had counts > 200 000/µL an indication for quinine but only 5/34 (14.7%) received quinine prescription. Five under-fives with parasitaemia > 200 000/µL had negative mRDT results. Being mRDT negative was significantly associated with receipt of an antibiotic prescription (χ2 = 162.2, P Conclusions Use of mRDT reduced unnecessary antimalarial use by 71.5%. However, this had the potential for over prescribing an antibiotic for non-malarial fevers. The diagnostic performance of mRDT was still high despite decline in malaria burden.

Prevalence and social drivers of HIV among married and cohabitating heterosexual adults in south-eastern Tanzania: analysis of adult health community cohort data

BackgroundIn sub-Saharan Africa, the prevalence of HIV among married and cohabiting couples is substantial. Information about the underlying social drivers of HIV transmission in couples is critical for the development of structural approaches to HIV prevention, but not readily available. We explored the association between social drivers, practices, and HIV status among stable couples in Ifakara, Tanzania.DesignUsing a cross-sectional design, we analyzed data from a sample of 3,988 married or cohabiting individuals, aged 15 years and older from the MZIMA adult health community cohort study of 2013. Sociodemographic factors (sex, income, age, and education), gender norms (perceived acceptability for a wife to ask her partner to use a condom when she knows he is HIV positive), marriage characteristics (being in a monogamous or a polygamous marriage, being remarried), sexual behavior practices (lifetime number of sexual partners and concurrent sexual partners), health system factors (ever used voluntary HIV counseling and testing), and lifestyle patterns (alcohol use) were used to explore the odds of being HIV positive, with 95% confidence intervals.ResultsPrevalence of HIV/AIDS was 6.7% (5.9% males and 7.1% females). Gender norms, that is, perception that a woman is not justified to ask her husband to use a condom even when she knows he has a disease (adjusted odds ratio AOR=1.51, 95% CI 1.06–2.17), marital characteristics, that is, being remarried (AOR=1.49, 95% CI 1.08–2.04), and sexual behavior characteristics, that is, lifetime number of sexual partners (2–4: AOR=1.47, 95% CI 1.02–2.11; 5+: AOR=1.61, 95% CI 1.05–2.47) were the main independent predictors of HIV prevalence.ConclusionsAmong married or cohabiting individuals, the key social drivers/practices that appeared to make people more vulnerable for HIV are gender norms, marriage characteristics (being remarried), and sexual behavior practices (lifetime number of sexual partners). Married and cohabiting couples are an important target group for HIV prevention efforts in Tanzania. In addition to individual interventions, structural interventions are needed to address the gender norms, remarriage, and sexual practices that shape differential vulnerability to HIV in stable couples.

Risk factors for placental malaria and associated adverse pregnancy outcomes in Rufiji, Tanzania: a hospital based cross sectional study.

Prevention and treatment of malaria during pregnancy is crucial for reduction of malaria in pregnancy and its adverse outcomes. The spread of parasite resistance to Sulphadoxine-Pyrimethamine (SP) used for Intermittent Preventive Treatment for malaria in pregnancy (IPTp), particularly in East Africa has raised concerns about the usefulness and the reliability of the IPTp regimen. We aimed to assess the effectiveness of two doses of SP in treating and preventing occurrence of adverse pregnancy outcomes. The study was an analytical cross sectional study which enrolled 350 pregnant women from Kibiti Health Centre, South Eastern Tanzania. Structured questionnaires were used to obtain previous obstetrics and medical history of participants and verified by reviewing antenatal clinic cards. Maternal placental blood samples for microscopic examination of malaria parasites were collected after delivery. Data was analyzed for associations between SP dosage, risk for PM and pregnancy outcome. Sample size was estimated based on precision. Prevalence of placental maternal (PM) was 8% among pregnant women (95%CI, 4.4-13.1%). Factors associated with increased risk of PM were primigravidity (P<0.001) and history of fever during pregnancy (P= 0.02). Use of at least 2 doses of SP for IPTp during pregnancy was insignificantly associated with reducing the risk PM (P=0.08), low birth weight (P=0.73) and maternal anemia (P=0.71) but associated significantly with reducing the risk of preterm birth (P<0.001). Two doses of SP for IPTp regime are ineffective in preventing and treating PM and adverse pregnancy outcome. Hence a review to the current IPTp regimen should be considered with possibility of integrating it with other malaria control strategies.

Community Knowledge and Perceived Effectiveness of Interventions to Reduce Malaria: Implications for Sustained Use of Malaria Interventions in Rufiji District, Southeastern Tanzania.

Insecticides treated-nets (ITNs) and artemether-lumefantrine (ALu), crucial for malaria elimination, depend on perceived effectiveness in reducing malarial fevers. We examined community knowledge and perceived effectiveness of ITNs and ALu for reducing malaria in Rufiji district. Heads of households were interviewed on causes of fever in underfives, fever history, and antimalarial use during the last 2 weeks, perceived effectiveness of, and willingness to continue using ALu and ITNs. A total of 1,885 respondents were interviewed, a majority (88.2%) females. Illnesses with fever (malaria-76.1% and respiratory conditions-58.9%) were major health problems. There was a very high recognition of fever as malaria symptom (95.1%). There were mixed perceptions on effectiveness of ALu and ITNs: ALu (52.8%) and on ITNs as highly effective (48.1%). Both ALu and ITNs were judged partially effective. Reorientation of social marketing to increase demand for ALu and ITNs for malaria control consolidation is crucial.

Participatory forest carbon assessment in south-eastern Tanzania: experiences, costs and implications for REDD+ initiatives

AbstractThe aim of this study was to determine the changes in forest carbon in three village forests in Tanzania during 2009–2012 using participatory forest carbon assessment, and to evaluate the capability of the local communities to undertake the assessment, and the costs involved. The results show that forest degradation is caused not only by disturbance as a result of anthropogenic activities; other causes include natural mortality of small trees as a result of canopy closure, and the attraction of wild animals to closed-canopy forests. Thus, mechanisms are required to compensate communities for carbon loss that is beyond their control. However, an increase in the abundance of elephantsLoxodonta africanaand other fauna should not be considered negatively by local communities and other stakeholders, and the importance of improved biodiversity in the context of carbon stocks should be emphasized by those promoting REDD+ (Reduced Emissions from Deforestation and Forest Degradation). This case study also shows that the cost per ha of USD &lt; 1 for participatory forest carbon assessment is less than that reported for Tanzania and elsewhere (USD 3–5); this is attributed to the large area of forest studied. However, the cost of data analysis and reporting in 2012 (USD 4,519) was significantly higher than the baseline cost (USD 1,793) established in 2009 because of the involvement of external experts.

How long-distance truck drivers and villagers in rural southeastern Tanzania think about heterosexual anal sex: a qualitative study

ObjectiveTo explore ideas of truck drivers and villagers from rural Tanzania about heterosexual anal sex (HAS) and the associated health risks.MethodsQualitative study using 8 in-depth interviews (IDIs) and 2 focus...

"It is the medicines that keep us alive": lived experiences of diabetes medication use and continuity among adults in Southeastern Tanzania.

BackgroundDiabetes is a chronic condition which requires many patients to use medications for the remainder of their lives. While this regimen is demanding, little research has been done on the experiences individuals have with diabetes medication use and the continuity of use, especially patients from rural areas of Tanzania. This study explores the lived experiences of diabetes medication use and the continuity of use among adult diabetes patients from rural communities with limited access to diabetes medicines.MethodsWe conducted 19 in-depth interviews to explore patients’ experiences with diabetes medication use and the continuity of use. We employed the 5As of access to care to situate the behavioral practices surrounding diabetes medication use in the study settings. The data analysis followed grounded theory principles, and was conducted with the help of NVivo 9.ResultsStudy participants expressed positive attitudes toward the use of diabetes medicines, but also concerns about affordability. The patients employed two main strategies for dealing with the cost. The first was to increase their available funds by spending less money on family needs, selling household property, asking family and friends for money, or borrowing cash. They also reported sourcing medicines from pharmacies to save on consultation and laboratory costs. Second, participants reported using less than the recommended dosage or skipping doses, and sharing medicines. The geographic accessibility of diabetes service providers, the availability of medication, and the organization of the diabetes services were also cited as barriers to taking medications and to using them continuously.ConclusionsThe strategies employed by the people in this study illustrate their resilience in the face of poverty and failing health care systems. More comprehensive strategies are therefore needed to encourage consistent medication use among people with chronic conditions. These strategies could include the reduction of prices by pharmaceuticals, the strengthening of community risk-pooling mechanisms and sustained health campaigns aimed at patients and the community.

"In a situation of rescuing life": meanings given to diabetes symptoms and care-seeking practices among adults in Southeastern Tanzania: a qualitative inquiry.

BackgroundDiabetes mellitus is an emerging public health problem in Tanzania. For the community and the health system to respond adequately to this problem, it is important that we understand the meanings given to its symptoms, and the care-seeking practices of individuals.MethodsTo explore collective views on the meanings given to diabetes symptoms, we conducted nine focus group discussions with adult diabetes patients and members of the general community. To gain a better understanding of how the meanings in the community inform the care-seeking practices of individuals, 19 in-depth interviews were conducted with diabetes patients. The data were analyzed using principles of grounded theory and applying cultural schema theory as a deductive framework.ResultsIn the communities and among the patients, knowledge and awareness of diabetes are limited. Both people with diabetes and community members referred to their prevailing cultural meaning systems and schemas for infectious diseases to interpret and assign meaning to the emerging symptoms. Diabetes patients reported that they had initially used anti-malarial medicines because they believed their symptoms—like headache, fever, and tiredness—were suggestive of malaria. Schemas for body image informed the meaning given to diabetes symptoms similar to those of HIV, like severe weight loss. Confusion among members of the community about the diabetes symptoms instigated tension, causing patients to be mistrusted and stigmatized. The process of meaning-giving and the diagnosis of the diabetes symptoms was challenging for both patients and health care professionals. Diabetes patients reported being initially misdiagnosed and treated for other conditions by medical professionals. The inability to assign meaning to the symptoms and determine their etiologies informed the decision made by some patients to consult traditional healers, and to associate their symptoms with witchcraft causes.ConclusionThe meanings given to diabetes symptoms and the care-seeking practices described in the study are shaped by the prevailing cultural schemas for infectious diseases and their treatments. Efforts to educate people about the symptoms of diabetes and to encourage them to seek out appropriate care should build on the prevailing cultural meaning system and schemas for diseases, health and illness.Electronic supplementary materialThe online version of this article (doi:10.1186/s12889-015-1504-0) contains supplementary material, which is available to authorized users.

English

Tanzania has over 12,000 plant species, some of which are endemic and have potential to yield useful medicines. This study seeks to document such plants used as traditional medicines for treatment of malaria in Kagera region of northwestern Tanzania and Lindi region in south eastern Tanzania. The study also reports on the antiplasmodial activity against chloroquine-resistant Plasmodium falciparum (Dd2) strain of some of the documented plants using the parasite lactate dehydrogenase method. A total of 108 plant species, among which the families Compositae (14; 12.96%), Fabaceae (12; 11.11%), Euphorbiaceae (8; 7.41%), Melastomataceae (6; 5.56%) and Myrtaceae (4; 3.70%) were documented. Sixteen (16; 44.4%) of 36 extracts from 31 plant species that were tested inhibited malaria parasites growth by more than 50%. Bersema abyssinica stem bark extract was the most active with 86.67% inhibition rate followed by Bridelia micrantha stem bark extract with 71.87% inhibition rate. These results confirm the potential for plants used in traditional medicine to yield active antimalarial compounds. Further in vitro and in vivo screening supported by bioassay-guided isolation of active compounds from plants showing good safety margin is suggested. Key words: Ethnobotanical survey, medicinal plants, malaria, treatment, in vitro antiplasmodial, Tanzania.

Palaeoproterozoic volcanism and granitic magmatism in the Ngualla area of the Ubendian Belt, SW Tanzania: Constraints from SHRIMP U–Pb zircon ages, and Sm–Nd isotope systematics

Secondary ion microprobe U–Pb zircon data and Sm–Nd isotopic compositions are presented for the volcanic and associated granitic rocks in the northern part of the Lupa terrane in the Ngualla area of the Ubendian Belt, southwestern Tanzania. The U–Pb data reveals two distinct episodes of volcanism in the area: a ∼1943Ma volcanism involving the eruption of basaltic andesites and a ∼1871Ma event during which porphyritic dacites (and minor rhyolites) erupted. The data further shows that the last episode of volcanism was coeval with the emplacement of potassic granites at ∼1878Ma. An older age of ∼2682Ma was obtained from zircons inherited from the pre-existing Archaean crust in a potassic granite. The basaltic andesites exhibit ɛNd (1943Ma) values of −3.33 to −6.24 and TDM ages of 2521–2883Ma whereas the porphyry dacites show ɛNd (1871) values of −5.72 to −5.94 and TDM ages are 2546–2573Ma. These TDM ages are 600–700Ma older than the emplacement ages of both the basaltic andesites and porphyry dacites. The potassic granites exhibit the most negative ɛNd (1878) values of all the rocks (−6.00 to −11.2) in the area and their TDM ages are 2568–3283Ma, which are 700–1400Ma older than their emplacement age. The ɛNd(t) values for both the Ngualla volcanic and granitic rocks are much lower than the corresponding mantle value of +6.13 at 1871Ma.The emplacement of ∼1.87Ga coeval felsic plutonic and volcanic rocks in the Ngualla area of the Ubendian Belt is also a feature of the nearby Usagaran Belt and this corroborates previous evidence that plutonism and volcanism in both the Usagaran and Ubendian belts took place at the same time. The presence of ∼1.87Ga granites in both the Usagaran and the Ubendian belt implies that granitic magmatism of this age was a regional thermal event that covered a significant portion of the Proterozoic terranes of southeastern and southwestern Tanzania. Inherited Archaean zircon crystals coupled with Negative ɛNd and Nd model ages 600–1400Ma older than their respective emplacement ages all suggest Palaeoproterozoic crust is derived, in part, by re-worked Archaean crust at the southwest corner of the Tanzanian Craton.

"The Ocean is our Farm": Marine Conservation, Food Insecurity, and Social Suffering in Southeastern Tanzania

This paper examines the social impact of a large-scale marine conservation project (Marine Park) in the coastal region of Mtwara, southeastern Tanzania, following displacement and the enforcement of restrictions on fishing and extracting marine resources. Through an analysis of interviews and focus group discussions with residents in six villages, the paper illustrates how the undesired effects of the Marine Park have become part of people’s everyday discourse regarding hardships and their experiences of the violence of everyday life. Elicited narratives provide insights into how the Marine Park, in combination with a multiplicity of factors leading to displacement, dispossession, and social dislocation, has intensified hardships, especially among female-headed households, due to their increasing poverty, marginalization, and food-related insecurity. The narratives shed light on people’s lived experiences of disempowerment, feelings of humiliation, anger, despair, low self-esteem, and extreme resentment—in essence, their social suffering. The paper makes a case for addressing the human dimensions of marine biodiversity and conservation interventions as a key step in making them genuinely collaborative and sustainable in terms of social equity and ecological effectiveness.

Using landscape characteristics to predict risk of lion attacks on humans in south-eastern Tanzania

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"We have become doctors for ourselves": motives for malaria self-care among adults in southeastern Tanzania.

BackgroundPrompt and appropriate treatment of malaria with effective medicines remains necessary if malaria control goals are to be achieved. The theoretical concepts from self-care and the health belief model were used to examine the motivations for malaria self-care among the adult population.MethodsA qualitative study was conducted through eight focus group discussions with adult community members to explore their general opinions, views and perceptions of malaria and of its treatments. These groups were followed by 15 in-depth interviews of participants with a recent malaria experience to allow for an in-depth exploration of their self-care practices. The analysis followed principles of grounded theory and was conducted using Nvivo 9 qualitative data management software.ResultsThe self-treatment of malaria at home was found to be a common practice among the study participants. The majority of the participants practiced self-medication with a painkiller as an initial response. The persistence and the worsening of the disease symptoms prompted participants to consider other self-care options. Perceptions that many malaria symptoms are suggestive of other conditions motivated participants to self-refer for malaria test. The accessibility of private laboratory facilities and drug shops motivated their use for malaria tests and for obtaining anti-malarial medicines, respectively. Self-treatment with anti-malarial monotherapy was common, motivated by their perceived effectiveness and availability. The perceived barriers to using the recommended combination treatment, artemether-lumefantrine, were related to the possible side-effects and to uncertainty about their effectiveness, and these doubts motivated some participants to consider self-medication with local herbs. Several factors were mentioned as motivating people for self-care practices. These included poor patient provider relationship, unavailability of medicine and the costs associated with accessing treatments from the health facilities.ConclusionsMalaria self-care and self-treatment with anti-malarial monotherapy are common among adults, and are motivated by both individual characteristics and the limitations of the existing health care facilities. There is a need for public health interventions to take into account community perceptions and cultural schemas on malaria self-care practices.

‘The land is now not fertile’: social landscapes of hunger in south-eastern coastal Tanzania

Based on ethnographic fieldwork in a coastal village in south-eastern Tanzania, this paper examines how social inequalities and social suffering become embodied in the lived experiences of hunger. The paper explores local meanings of food, fertility and hunger and how these concepts interconnect and materialize on a landscape impacted by two large-scale conservation and development projects, the Mtwara Development Corridor and the Mnazi Bay Ruvuma Estuary Marine Park. Fourteen in-depth interviews Sinde villagers were conducted to elicit narratives about their food experiences in addition to 24 hour food recall and pile sort to explore local taxonomies of food. One focus group discussion with six women was also conducted. The study finds displacement from resources by the conservation and development projects has exacerbated existing food security issues of irregular rains, increasing food prices and malnourished bodies. The downward cycle of food insecurity has local villagers worried about the viability of their community's future, embodied in the health of local children and their performance in school. Increasing food insecurity is internalized within the community as infertility where the health of the landscape is connected to the health of society.

Effectiveness of soil conservation measures in two contrasting landscape units of South Eastern Tanzania

RUSLE, the revised universal soil loss equation, is widely used for estimating potential soil erosion by water. Field measured model factors are however scarce for tropical regions. We derived RUSLE factors for several soil conservation measures based on three seasons of field plot measurements (2008-2010), in two contrasting landscape units of South Eastern Tanzania, the country's most important cashew growing area. Whereas the derived factors are useful for applying RUSLE in similar environments, this study points to the importance of understanding differences between soil types and landscape units when assessing potential soil erosion. On the Makonde plateau, rainfall erosivity was higher than on the inland plains (7,130 vs 5,783 MJ mm ha-(1)h(-1) year(-1)). The soil erodility K factor was also higher (0.014 t h MJ(-1) mm(-1)) on the sandy Cutanic Acrisols of the Makonde plateau than on the clayey Acric Ferralsols (0.006 t h MJ(-1) mm(-1)) of the inland plains. Likewise, soil loss on the Makonde plateau was much higher than on the inland plain (e.g. for 33-127 t ha(-1) season(-1) vs 3-10 t ha(-1) season(-1)). The differences between the C factor for maize, and for maize with crop residues, as well as the differences between the P factors for lemon grass strips and ridges and furrows indicate that although soils of the Makonde plateau are more susceptible to soil erosion, these soils are also more responsive to soil conservation measures compared to soils of the inland plains. Farmers' local technique of making ridges and furrows is particularly effective. Furthermore, the C factors for cashew groves are one order of magnitude lower (0.08-0.09) than for maize, or for maize with crop residues (0.2-0.7), but are still much higher than for bush fallow (0.001). Deforestation for agriculture hence bears the risk of increasing soil erosion rates; however, this risk can be minimised by growing cashew trees.

Santonian–Campanian planktonic foraminifera from Tanzania, Shatsky Rise and Exmouth Plateau: Species depth ecology and paleoceanographic inferences

Abstract The Santonian–Campanian interval is of particular interest as it encompasses a cooling trend after the Late Cretaceous greenhouse maximum warmth of the Turonian as well as a possibly related major faunal turnover among planktonic foraminifera. The recovery of pristinely preserved planktonic foraminifera from Santonian–Campanian sequences in southeastern Tanzania allows examination of faunal changes and documentation of species-specific stable isotope (δ 13 C and δ 18 O) signatures. These isotopic data are ideal for inferring species paleoecological preferences and for tracing major paleoceanographic changes. This study reports the first δ 18 O and δ 13 C data generated on “glassy” specimens of Marginotruncana coronata , M. undulata , M. marginata , and M. pseudolinneiana and Sigalia carpatica . Additional results from Shatsky Rise (Ocean Drilling Program Leg 198, Hole 1210B) and Exmouth Plateau (ODP Leg 122, Hole 762C) provide geographic control on species habitat preferences and paleoceanographic context. Isotopic analyses suggest that double-keeled species, including Globotruncana bulloides , Contusotruncana fornicata , C. plummerae and probably marginotruncanids, inhabited the surface mixed layer, whereas the biserial Gublerina rajagopalani was a permanent thermocline dweller. Thus, our study confirms recent suggestions that the depth-distribution models based on shell morphology and analogies with modern taxa are not applicable. At all the examined localities, changes in planktonic foraminiferal assemblages are used to define several ecological intervals, each one characterized by a distinctive taxonomic composition and/or increasing/decreasing species diversity. Combined geochemical and paleontological observations suggest that, by the middle–late Campanian, a stratified upper water column developed in Tanzania while less stratified and/or mesotrophic conditions prevailed at Shatsky Rise and Exmouth Plateau.

More people, more trees in South Eastern Tanzania: local and global drivers of land-use/cover changes

Land degradation in South Eastern Tanzania, the country’s major cashew producing area, has been attributed to deforestation. By comparing land-use/cover maps derived from aerial photographs of 1965 with maps derived from satellite images of 2002, we assessed how land-use changed in six villages, and relate these to local and global drivers. Land-use/cover changes are complex processes, which we analyzed by determining the relative net changes, losses, persistence and gains of each land-use/cover categories. Widespread planting of cashew trees only started in the 1960s; while the ‘villagisation’ program in the 1970s, altered settlement patterns as centrally planned villages were created. Population growth and rural development policies were major local drivers for land-use/cover change; international trade and technological innovations were principal global drivers. Though population increase led to a reduction of natural vegetation, the spread of cashew trees resulted in a case of ‘more people, more trees.’ How far the ensuing deforestation affected the biodiversity of the area and how sustainable the production of cashew nuts actually is, remains yet unresolved questions.