Monster Seminar JAM - Tales from the foraging arena: recent developments in ecosystem modeling using Ecopath/Ecosim
Dr. Carl J. Walters, Fisheries Science Centre, University of British Columbia.
AbstractEcosim is a food web model based on the assumption that nonrandom spatial distributions develop in most organisms through behaviors aimed at managing predation risk, and that this risk management behavior can severely limit trophic interactions. Ecosim started out as a simple biomass-dynamics modeling approach linked to Ecopath mass balance assessments, but has now evolved to incorporate complex size-age population dynamics and meso-scale spatial dynamics. It has been very widely applied to large ecosystems ranging from the Great Lakes to the tropical central Pacific, and appears to be quite successful at reproducing broad patterns of historical abundance change associated with fisheries impact, marine mammal protection, and productivity changes associated with regime shifts. One of its main current applications is in optimization studies aimed at finding balanced ecosystem-scale harvest policies in situations where multiple fisheries may interfere with one another and with the protection of nonharvested species.
Date and Time:
October 2, 2003,
11:00 am - 12:30 pm