Changes between Version 7 and Version 8 of EwEugUsingEcosimToStudyCompensationInRecruitmentRelationships


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Timestamp:
2010-11-22 01:40:06 (9 years ago)
Author:
shermanl
Comment:

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  • EwEugUsingEcosimToStudyCompensationInRecruitmentRelationships

    v7 v8  
    2424 1. Go to the [wiki:EwEugRunEcosim Run Ecosim] form (Time dynamic (Ecosim) > Output > Run Ecosim), select ''Groups'' from the drop-down ''Target'' menu on and then the adult pool. Using the fishing rate sketch pad, set up a fishing rate time series pattern where fishing is first stopped for a decade or so then ramped up over the remaining years to a very high value relative to your baseline rate from Ecopath. 
    2525 1. Open the ''S/R plot'' form, and select the same adult group (Time dynamic (Ecosim) > Output > S/R plot). 
    26  1. Then run a series of scenarios.  If the stock 'crashes' completely under heavy fishing, reshape the fishing rate to stop a few years after the crash, to check for a 'multiple equilibrium' outcome: i.e., for some models, and especially for top predators, there may be 'delayed depensation' effect where the predator fails to recover after heavy fishing, due to increases in species that it eats that are in turn competitors/predators on its juvenilesthese species can cause 'recruitment failure'. 
     26 1. Then run a series of scenarios.  If the stock 'crashes' completely under heavy fishing, reshape the fishing rate to stop a few years after the crash, to check for a 'multiple equilibrium' outcome: i.e., for some models, and especially for top predators, there may be 'delayed depensation' effect where the predator fails to recover after heavy fishing, due to increases in species that it eats that are in turn competitors/predators on its juveniles - these species can cause 'recruitment failure'.