Changes between Version 2 and Version 3 of EwEugUsingEcosimToStudyCompensationInRecruitmentRelationships


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Timestamp:
2010-01-30 20:11:16 (10 years ago)
Author:
varunr
Comment:

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  • EwEugUsingEcosimToStudyCompensationInRecruitmentRelationships

    v2 v3  
    66When Ecosim users create multi-stanza dynamics, they need to be careful in setting  model parameters that define/create compensatory effects.  This begins with the Ecopath input parameters; in order for the juvenile dynamics to Figure compensatory mortality changes, at least two conditions are needed or helpful: 
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    8  * the juvenile group(s) must have relatively high ''P/B'', i.e. high total mortality rate (see ![wik:EwEugEditMultiStanzaGroups Edit multi-stanza groups]);[[BR]] 
     8 * the juvenile group(s) must have relatively high ''P/B'', i.e. high total mortality rate (see [wiki:EwEugEditMultiStanzaGroups Edit multi-stanza groups]);[[BR]] 
    99 * the juvenile group(s) must have either relatively high EE (so that most mortality is accounted for as predation effects within the model) or else the user must specify a high (near 1.0) value in the Ecosim [[Group info.htm|Group info]] form entry for the juvenile group’s ‘Proportion of other mortality sensitive to changes in feeding time’ column. 
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    1311Compensatory effects can be increased (the recruitment relationship is flat over a wider range of adult stock sizes, with a steeper slope of recruitment curve near the origin) by: