A target to reduce phosphorus flows into the Gippsland Lakes in south-eastern Australia by 40 per cent to improve water quality has previously been established by stakeholders. An integrated analysis at the catchment scale is undertaken to assess the agricultural land management changes required...

This paper describes a complex, dynamic simulation model that has been developed for the analysis of integrated weed management programmes for the control of annual barnyardgrass (Echinochloa crus-galli) in rice farming systems in the Philippines. Users of the model may simulate any feasible...

Exploitation frequently reduces the mean age of a fish population, particularly where a lack of property rights stimulates producers to ignore the user cost of harvest. The authors demonstrate that harvesting a young fish bears a significant efficiency cost when the multiple benefits accruing to...