Changes between Version 1 and Version 2 of EwEugMortalityCoefficients


Ignore:
Timestamp:
2010-11-23 01:27:33 (9 years ago)
Author:
shermanl
Comment:

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  • EwEugMortalityCoefficients

    v1 v2  
    22The ''Mortality coefficients form'' (Figure 7.1) is one of the most important forms on the ''Parameterization menu'' and it is, as a rule, the first one that should be checked when balancing a model. 
    33 
    4 This form gives the Ecopath-predicted values of each type of mortality for each group in the model (see below). During balancing, the ''Mortality coefficients form'' will guide you in identifying where problems are (e.g., if its fishing or predation mortality that is too high). If predation mortality is too high, then you can use the [wiki:EwEugPredationMortality Predation mortality] form to identify which predators are causing the problem. 
     4This form gives the Ecopath-predicted values of each type of mortality for each group in the model (see below). During balancing, the ''Mortality coefficients form'' will guide you in identifying where problems are (e.g., if it's fishing or predation mortality that is too high). If predation mortality is too high, then you can use the [wiki:EwEugPredationMortality Predation mortality] form to identify which predators are causing the problem. 
    55 
    66'''Components of mortality in Ecopath''' 
     
    2626[[Image(wiki:EwEugImages:08000060.png)]]=[[Image(wiki:EwEugImages:08000061.png)]] ''' Eq. 27''' 
    2727 
    28 In some models, (e.g., the Multispecies Virtual Population Analysis model of the North Sea, Sparre, 1991), the ‘other mortality’ component is split between ''M1'',,''i'',,, i.e., predation by predators not included in the model, and ''M0'',,''i'',,, ‘other mortality’, caused by diseases, senescence, etc. In Ecopath, ''M1'' is not included, as all predation mortality should be described explicitly. Further, ''M0'',,''i'',, is not entered directly, but is computed from the ecotrophic efficiency, ''EE'',,''i'',,, Thus: 
     28In some models, (e.g., the Multispecies Virtual Population Analysis model of the North Sea, Sparre, 1991), the 'other mortality' component is split between ''M1'',,''i'',,, i.e., predation by predators not included in the model, and ''M0'',,''i'',,, 'other mortality', caused by diseases, senescence, etc. In Ecopath, ''M1'' is not included, as all predation mortality should be described explicitly. Further, ''M0'',,''i'',, is not entered directly, but is computed from the ecotrophic efficiency, ''EE'',,''i'',,, Thus: 
    2929 
    3030''F,,i,,'' is the Fishing mortality coefficient; 
     
    5252If any component of the system is harvested, a summary of the mortality coefficients can be displayed, which presents total mortality (''Z = P/B'') and its component: fishing mortality (''F''), other exports (''E''), other mortality (''M,,0,,''), and predation mortality (''M2''). Predation mortality is further broken down to show the contribution of each consumer groups to the total predation mortality of each prey group. 
    5353 
    54 See also introductory material on [[Production.htm|Production]], [[Consumption.htm|Consumption]], [[Dealing with open system problems.htm|Dealing with open system problems]] and [[Other mortality.htm|Other mortality]]. 
     54See also introductory material on [EwEugProduction Production], [EwEugConsumption Consumption], [EwEugDealingWithOpenSystemProblems Dealing with open system problems] and [EwEugOtherMortality Other mortality]. 
    5555 
    5656[[Image(wiki:EwEugImages:MortalitiesScreen_sc.bmp)]]