Changes between Version 1 and Version 2 of EwEugKeyIndices


Ignore:
Timestamp:
2010-11-23 01:22:01 (9 years ago)
Author:
shermanl
Comment:

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  • EwEugKeyIndices

    v1 v2  
    22'''Biomass accumulation''' 
    33 
    4 Ecopath is not necessarily a steady-state model. If the biomass for a group is known, e.g., at the beginning of the year and at the beginning of the next year, the biomass accumulation (''BA'') can be calculated as the difference between these biomasses. ''BA'' is a production term that can be entered for all living groups (default is 0), but is calculated for detritus groups (see [[Detritus fate.htm|Detritus fate]]). ''BA'' is a flow term, with a rate unit of, e.g., t / km² / year. The default value for ''BA'' is zero indicating no biomass accumulation. A negative value signifies biomass depletion (biomass decreased during period modelled). 
     4Ecopath is not necessarily a steady-state model. If the biomass for a group is known, e.g., at the beginning of the year and at the beginning of the next year, the biomass accumulation (''BA'') can be calculated as the difference between these biomasses. ''BA'' is a production term that can be entered for all living groups (default is 0), but is calculated for detritus groups (see [EwEugDetritusFate Detritus fate]). ''BA'' is a flow term, with a rate unit of, e.g., t / km² / year. The default value for ''BA'' is zero indicating no biomass accumulation. A negative value signifies biomass depletion (biomass decreased during period modelled). 
    55 
    66'''Biomass accumulation rate''' 
     
    1919'''Flow to detritus''' 
    2020 
    21 For each group, the flow to the detritus consists of what is egested (the non-assimilated food) and those elements of the group, which die of old age, diseases, etc., (i.e., of sources of ‘other mortality’, expressed by 1 - ''EE''). The flow to the detritus, expressed, e.g., in t·km-2·year-1, should be positive for all groups. 
     21For each group, the flow to the detritus consists of what is egested (the non-assimilated food) and those elements of the group, which die of old age, diseases, etc., (i.e., of sources of 'other mortality', expressed by 1 - ''EE''). The flow to the detritus, expressed, e.g., in t·km-2·year-1, should be positive for all groups. 
    2222 
    2323===  === 
     
    4242'''Omnivory index''' 
    4343 
    44 The ‘omnivory index’ was introduced in 1987 (Pauly et al., 1993a) in the initial version of the Ecopath II software. This index (''OI'') is calculated as the variance of the trophic level of a consumer's prey groups. Thus 
     44The 'omnivory index' was introduced in 1987 (Pauly et al., 1993a) in the initial version of the Ecopath II software. This index (''OI'') is calculated as the variance of the trophic level of a consumer's prey groups. Thus 
    4545 
    4646[[Image(wiki:EwEugImages:08000057.png)]] '''Eq. 22'''