Changes between Version 2 and Version 3 of EwEugOnTheNeedForInputParameters
- Timestamp:
- 2010-11-21 22:27:47 (13 years ago)
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EwEugOnTheNeedForInputParameters
v2 v3 1 1 == 2.3 On the need for input parameters == 2 2 3 Not all parameters used to construct a model need to be entered. The Ecopath model ‘links’the production of each group with the consumption of all groups, and uses the linkages to estimate missing parameters, based on the mass-balance requirement of equation (1) that production from any of the groups has to end somewhere else in the system. This can be expressed, where there is not accumulation of biomass as3 Not all parameters used to construct a model need to be entered. The Ecopath model 'links' the production of each group with the consumption of all groups, and uses the linkages to estimate missing parameters, based on the mass-balance requirement of equation (1) that production from any of the groups has to end somewhere else in the system. This can be expressed, where there is not accumulation of biomass as 4 4 5 5 Production = Catch + biomass accumulation + predation mortality + net migration + other mortality