Journal Articles

A programmable information system for management and analysis of aquatic species range data in California

The decline of species worldwide is both alarming and difficult to document due to a lack of reliable information on the geospatial extent and corresponding status of a given taxon. Freshwater habitats are disproportionately degraded globally with resultant declines in populations in freshwater fishes and subsequent retractions in biogeographic ranges. Conservation challenges in freshwater are compounded because aquatic taxa are inherently difficult to map. We addressed this problem for California freshwater fishes by developing the software and underlying database.

Positive Mathematical Programming

A method for calibrating models of agricultural production and resource use using nonlinear yield or cost functions is developed. The nonlinear parameters are shown to be implicit in the observed land allocation decisions at a regional or farm level.