Browsing by Author "Ralaizafisoloarivony, Njaka A."

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    Small mammals distribution and diversity in a plague endemic area in West Usambara Mountains, Tanzania
    (Tanzania Journal of Health Research, 2014-07-03) Ralaizafisoloarivony, Njaka A.; Kimaro, D. N.; Kihupi, Nganga I.; Mulungu, Loth S.; Leirs, Herwing; Deckers, J.; Msanya, B. M.; Gulinck, Hubert
    Small mammals play a role in plague transmission as hosts in all plague endemic areas. Information on distribution and diversity of small mammals is therefore important for plague surveillance and control in such areas. The objective of this study was to investigate small mammals’ diversity and their distribution in plague endemic area in the West Usambara Mountains in north-eastern Tanzania. Landsat images and field surveys were used to select trapping locations in different landscapes. Three landscapes with different habitats were selected for trapping of small mammals. Three types of trap were used in order to maximise the number of species captured. In total, 188 animals and thirteen species were captured in 4,905 trap nights. Praomys delectorum and Mastomys natalensis both reported as plague hosts comprised 50% of all the animals trapped. Trap success increased with altitude. Species diversity was higher in plantation forest followed by shrub, compared to other habitats, regardless of landscape type. It would therefore seem that chances of plague transmission from small mammals to humans are much higher under shrub, natural and plantation forest habitats.
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    Vegetation habitats and small mammals in a plague endemic area in Western Usambara Mountains, Tanzania
    (Tanzania Journal of Health Research, 2014-07) Ralaizafisoloarivony, Njaka A.; Kimaro, D. N.; Kihupi, Nganga I.; Msanya, B. M.; Mulungu, Loth S.; Leirs, Herwing; Deckers, J.; Gulinck, Hubert
    Human plague still exists in different parts of the world, including some landscapes in north- eastern Tanzania. Wherever the hotspot of plague, small mammals seem to play a key role as host. The objective of this study was to investigate the relationship between vegetation habitats types and small mammals in a plague endemic area of Lushoto District in Tanzania. A combination of field survey and Landsat images was used to identify the vegetation habitats. Small mammals were trapped in the mapped vegetation units, and identified. In total, six main types of vegetation habitats were investigated. A total of 13 small mammal species, potentially related to plague were trapped. Results show that annual cultivated crops habitat accounted for 80% of Mastomys natalensis while natural forest accounted for 60% of Praomys delectorum. These findings have shed new light on the diversity of rodents in different habitats of natural and semi-natural vegetations, and agricultural crops in the study area, which is an important intermediate step in unravelling the complex human plague system.