Changes between Version 3 and Version 4 of EwEugEcopathInputs


Ignore:
Timestamp:
2010-11-23 00:26:57 (8 years ago)
Author:
shermanl
Comment:

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  • EwEugEcopathInputs

    v3 v4  
    33This chapter describes the steps taken to build, parameterize and balance an Ecopath model. The [wiki:EwEugIntroductoryMaterialEcopath Introductory material] (Chapter 2 of the User Guide) gave a scientific overview of the fundamental features of Ecopath and descriptions of the basic equations governing Ecopath, in particular, the system of linear equations that Ecopath solves under the assumption of mass balance. Other major assumptions are also discussed in the Introductory material and consideration is given to the types of data that are appropriate for use with Ecopath. Before proceeding with the instructions below for building an Ecopath model, you are strongly encouraged to read this material and thoroughly familiarise yourself with the relevant scientific literature, particularly the original Ecopath, Ecosim and Ecospace papers (Polovina 1984; Christensen and Pauly 1992; Walters et al. 1997; 1999; Christensen and Walters 2004). 
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    5 The first task in building an Ecopath model is to define the models functional groups and fishing fleets (see [EwEugEditGroups Edit groups], [EwEugEditMultiStanzaGroups Edit multi-stanza groups] and [EwEugEditFleets Edit fleets]). Once the basic structure of the model is in place, you can enter parameters using the forms found under the Input data node in the Navigator window. 
     5The first task in building an Ecopath model is to define the model's functional groups and fishing fleets (see [EwEugEditGroups Edit groups], [EwEugEditMultiStanzaGroups Edit multi-stanza groups] and [EwEugEditFleets Edit fleets]). Once the basic structure of the model is in place, you can enter parameters using the forms found under the Input data node in the Navigator window. 
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    7 Once you have defined the models functional groups and fishing fleets, you can enter the input parameters for functional groups and fisheries. Data is input into Ecopath using a number of entry forms accessible under the Input data node in the Navigator window. These forms include: [EwEugBasicInput Basic input], [EwEugDietComposition Diet composition], [EwEugDetritusFate Detritus fate], [EwEugOtherProduction Other production], [EwEugFishery Fishery], [EwEughDefinitionOfFleets Definition of fleets], [EwEugLandings Landings], [EwEugDiscards Discards], [EwEugDiscardFate Discard fate], [EwEugOffVesselPrice Market price] and [EwEugNonMarketPrice Non-market price]). 
     7Once you have defined the model's functional groups and fishing fleets, you can enter the input parameters for functional groups and fisheries. Data is input into Ecopath using a number of entry forms accessible under the Input data node in the Navigator window. These forms include: [EwEugBasicInput Basic input], [EwEugDietComposition Diet composition], [EwEugDetritusFate Detritus fate], [EwEugOtherProduction Other production], [EwEugFishery Fishery], [EwEughDefinitionOfFleets Definition of fleets], [EwEugLandings Landings], [EwEugDiscards Discards], [EwEugDiscardFate Discard fate], [EwEugOffVesselPrice Market price] and [EwEugNonMarketPrice Non-market price]). 
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    99Before entering data, you are encouraged to read the introductory material on the mass balance approach to ecosystem modelling for information about how the input parameters are used in the model (see links in [EwEugIntroductoryMaterialEcopath Introductory material Ecopath]).