Abstract:
A mark–capture–release (CMR) study was carried out in Morogoro, Tanzania, from April 1999 to August
2000 to investigate the effect of slashing and burning versus tractor ploughing on the population of rodents in agricultural
fields. We found that the spatial distribution of individuals was significantly affected by the land preparation
method. The coefficient of dispersion values (based on variance-to-mean ratio calculations) indicated that more animals
clustered around the edges in tractor-ploughed fields whereas in the slashed-and-burnt fields, animals were randomly
distributed. Before land preparation, animals were randomly distributed everywhere. This suggests that the
slashing-and-burning practice does not affect the rodent population distribution in crop fields while tractor ploughing
does affect rodents, probably by reducing cover and food availability or even by killing some individuals. Yet, it seems
useful as a management tool when it is practised over a large area and if the surrounding fallow lands, which act as
donor habitat, are cleared.
