Batchelder, H. P. University of California, halbatch@socrates.berkeley.edu
Edwards, C. P. University of California, cae@socrates.berkeley.edu
Powell, T. M. University of California, zackp@socrates.berkeley.edu

 
EXPLORING COPEPOD POPULATION DYNAMICS IN COASTAL UPWELLING SYSTEMS: INDIVIDUAL-BASED PHYSIOLOGICAL MODELS COUPLED TO IDEALIZED 2-D PHYSICAL CIRCULATION/NPZ MODELS
 
The population dynamics of copepods are investigated using an individual-based bioenergetics model (IBM) of growth and reproduction (Batchelder and Miller, 1989; Batchelder and Williams, 1995) within a coastal upwelling ecosystem simulated using a two dimensional wind-forced physical model and a nutrient-phytoplankton-zooplankton (NPZ) model modified from that of Franks and Walstad (1997). The principal modifications of the NPZ model were to alter parameters so that the Z dynamics were more appropriate to microzooplankton than to macrozooplankton and to impose Z^2 mortality as closure on the highest trophic level. The coupled physical-NPZ model provides regions of enhanced primary productivity (elevated P) and microzooplankton productivity (elevated Z) in the mixed layer nearshore, with the higher P slightly inshore of the Z peak. Temperature, flow, P, and Z fields from the circulation-NPZ model was used to force the IBM. Individual copepods were tracked as they drifted and/or migrated within the model domain described by the coupled physical-NPZ model. The interaction of spatial variability in the forcing fields (food, temperature, flow) and copepod behavior (diel vertical migration) had large impacts on copepod demographics and retention within the nearshore, productive zone.
 
Day: Wednesday, Feb. 3
Time: 03:30 - 03:45pm
Location: Hilton of Santa Fe
 
Code: SS20WE0330H