Hieronimo, Proches; Kimaro, D. N.; Kihupi, Nganga I.; Gulinck, Hubert; Mulungu, Loth S.; Msanya, B. M.; Leirs, Herwing; Deckers, J.
Description:
Small mammals are considered to be involved in the transmission cycle of bubonic plague, still
occurring in different parts of the world, including the Lushoto District in Tanzania. The objective of this
study was to determine the relationship between land use types and practices and small mammal
abundance and distribution. A field survey was used to collect data in three landscapes differing in plague
incidences. Data collection was done both in the wet season (April-June 2012) and dry season (August-
October 2012). Analysis of variance and Boosted Regression Trees (BRT) modelling technique were used to
establish the relationship between land use and small mammal abundance and distribution. Significant
variations (p ≤ 0.05) of small mammal abundance among land use types were identified. Plantation forest
with farming, natural forest and fallow had higher populations of small mammals than the other
aggregated land use types. The influence of individual land use types on small mammal abundance level
showed that, in both dry and wet seasons, miraba and fallow tended to favour small mammals’ habitation
whereas land tillage practices had the opposite effect. In addition, during the wet season crop types such
as potato and maize appeared to positively influence the distribution and abundance of small mammals
which was attributed to both shelter and food availability. Based on the findings from this study it is
recommended that future efforts to predict and map spatial and temporal human plague infection risk at
fine scale should consider the role played by land use and associated human activities on small mammal
abundance and distribution.