Vezina, A. F.. Department of Fisheries and Oceans, vezinaa@dfo-mpo.gc.ca
Savenkoff, C. F.. Department of Fisheries and Oceans, savenkoffc@dfo-mpo.gc.ca

 
INVERSE ANALYSIS OF PELAGIC ECOSYSTEMS: LESSONS LEARNED FROM APPLICATIONS TO JGOFS DATA
 
As part of the Canadian JGOFS effort, inverse methods were applied to data on pelagic food web structure and processes collected in the Eastern Canadian shelf and the subarctic Pacific Ocean. The goal of inverse analysis is to reconstruct the steady state carbon flows that fit the available site-specific data while respecting general a priori constraints on ecological processes. This turned out to be difficult to do in both systems. We had to discard some data/constraints or give them lower weight in the analysis in order to conserve carbon. We sometimes had to introduce additional pathways to allow carbon to balance. Inverse analysis is a powerful tool to check for internal consistency in the data and to provide new insights into ecosystem dynamics. However, the ratio of site-specific data to general a priori constraints is quite low in current applications (approximately one to five). We discuss ways in which this ratio could be improved.
 
Day: Monday, Feb. 1
Time: 02:30 - 02:45pm
Location: Eldorado Hotel
 
Code: SS44MO0230E