= 2 Introductory material: Ecopath = This chapter contains details of the theory underpinning the functioning of Ecopath: 1. [EwEugMortalityForaPreyIsConsumptionForaPredator Mortality for a prey is consumption for a predator] 1. [EwEugTheEnergyBalanceOfaBox The energy balance of a box] 1. [EwEugOnTheNeedForInputParameters On the need for input parameters] 1. [EwEugDefiningTheSystem Defining the system] 1. [EwEugDealingWithOpenSystemProblems Dealing with open system problems] 1. [EwEugProduction Production] 1. [EwEugConsumption Consumption] 1. [EwEugOtherMortality Other mortality] 1. [EwEugRepresentationOfMultiStanzaLifeHistoriesInEcopathEcoSimAndEcospace Representation of multi-stanza life histories]. See Ecopath inputs and [EwEugEcopathInputs#a6UsingEcopath.Part1:Ecopathinputs Ecopath outputs] for links to instructions for using Ecosim.