Meliyo, Joel, L.; Massawe, Boniface H. J.; Msanya, B. M.; Kimaro, D. N.; Hieronimo, Proches; Mulungu, Loth S.; Kihupi, N. I.; Deckers, Jozef, A.; Gulinck, Hubert; Leirs, Herwig
Description:
Previous studies suggest that rodent burrows, a proxy for rodent population are important for
predicting plague risk areas. However, studies that link landform, surface attributes and rodent burrows in
the Western Usambara Mountains in Tanzania are scanty. Therefore, this study was conducted in plague
endemic area of the Western Usambara Mountains in northern, Tanzania, to explore the relationship
between rodent burrows, and landform and surface attributes. The study was carried out in three areas
corresponding to high (Lokome), medium (Lukozi) and low (Mwangoi) frequency of reported plague
cases. Data were collected from 117, 200 and 170 observation sites for Lokome, Lukozi and Mwangoi,
respectively using 100 m x 200 m quadrats. Remote sensing and field surveys were used to collect data on
landform and surface attributes. Rodent burrows were surveyed and quantified by counting the number of
burrows in 20m x 20m grids demarcated on the main 100m x 200m quadrats. The collected data were
analysed in R software using boosted regression trees (BRT) technique. Rodent burrows were found at an
elevation of above 1600m in the high and medium plague frequency landscapes. No burrows were found in
the low plague frequency landscape situated below 1500m. BRT analysis shows a significant relationship
between landform characteristics and rodent burrows in both high and medium plague frequency
landscapes. Overall, elevation and hillshade are the most important determinants of rodent burrow
distribution in the studied landscapes. It is concluded that in high altitudes, specific landform attributes
(hill-shade, slope, elevation) and vegetation cover- favour rodent burrowing.