Changes between Version 4 and Version 5 of EwEugConsumption


Ignore:
Timestamp:
2010-11-18 03:01:16 (9 years ago)
Author:
shermanl
Comment:

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  • EwEugConsumption

    v4 v5  
    1515The authors present three related models: 
    1616 
    17 ''''''log(''Q/B'') = 7.964 - 0.204 log''W,,∞,,'' - 1.965 .'' T''' + 0.083 . ''A'' + 0.532 . ''h'' + 0.398 . ''d''''' Eq. 17''' 
     17log(''Q/B'') = 7.964 - 0.204 log''W,,∞,,'' - 1.965 .'' ''T' '' + 0.083 . ''A'' + 0.532 . ''h'' + 0.398 . ''d''''' Eq. 17''' 
    1818 
    19 (R²=0.53, 98 df), where, ''W,,∞,,'' is the asymptotic weight (g), ''T’'' is an expression for the mean annual temperature of the water body, expressed using ''T’'' = 1000/Kelvin (Kelvin = °C + 273.15), A is the aspect ratio (see Figure 2.1), ''h'' is a dummy variable expressing food type (1 for herbivores, and 0 for detritivores and carnivores), and ''d'' is a dummy variable also expressing food type (1 for detritivores, and 0 for herbivores and carnivores) 
     19(R²=0.53, 98 df), where, ''W,,∞,,'' is the asymptotic weight (g), ''T' '' is an expression for the mean annual temperature of the water body, expressed using ''T' '' = 1000/Kelvin (Kelvin = °C + 273.15), A is the aspect ratio (see Figure 2.1), ''h'' is a dummy variable expressing food type (1 for herbivores, and 0 for detritivores and carnivores), and ''d'' is a dummy variable also expressing food type (1 for detritivores, and 0 for herbivores and carnivores) 
    2020 
    21 The equation was modified to investigate the effect on mortality on ''Q/B'', and to derive predictive models of ''Q/B'' taking explicit account of different mortalities, values of'' Q/B'' were calculated using the equation above for mortalities corresponding to ''f'' · ''M'', where ''f'' is a multiplicative factor with value of 0.5, 1, 2 or 4, and ''M'' is the natural mortality rate that is estimated from Paulys (1980) empirical relationship. 
     21The equation was modified to investigate the effect on mortality on ''Q/B'', and to derive predictive models of ''Q/B'' taking explicit account of different mortalities, values of'' Q/B'' were calculated using the equation above for mortalities corresponding to ''f'' · ''M'', where ''f'' is a multiplicative factor with value of 0.5, 1, 2 or 4, and ''M'' is the natural mortality rate that is estimated from Pauly's (1980) empirical relationship. 
    2222 
    23 log(''Q/B'') = 8.056 + 0.300log''f'' - 0.201 log''W,,∞,,'' - 1.989 .'' T''' + 0.081 . ''A'' + 0.522 . ''h'' + 0.393 . ''d ''''' Eq. 18''''''' 
     23log(''Q/B'') = 8.056 + 0.300log''f'' - 0.201 log''W,,∞,,'' - 1.989 .'' ''T' '' + 0.081 . ''A'' + 0.522 . ''h'' + 0.393 . ''d ''''' Eq. 18''''''' 
    2424 
    25 (R²=0.52, 102 df), where ''f'' is the multiplicative factor introduces above, and the rest of the variables are as defined earlier. Note that in Palomares and Pauly (1998) Eq. 12, the sign for the ''T'' factor was reversed by mistake. 
     25(R²=0.52, 102 df), where ''f'' is the multiplicative factor introduces above, and the rest of the variables are as defined earlier. Note that in Palomares and Pauly (1998) Eq. 12, the sign for the ''T''' factor was reversed by mistake. 
    2626 
    2727For cases where an estimate of total mortality, ''Z'', (per year) is available the following relation may be used: 
    2828 
    29 log(''Q/B'') = 5.847 + 0.280 log''Z'' - 0.152 log''W,,∞,,'' - 1.360 .'' T''' + 0.062 . ''A'' + 0.510 . ''h'' + 0.390 . ''d ''''' Eq. 19''' 
     29log(''Q/B'') = 5.847 + 0.280 log''Z'' - 0.152 log''W,,∞,,'' - 1.360 .'' ''T' '' + 0.062 . ''A'' + 0.510 . ''h'' + 0.390 . ''d ''''' Eq. 19''' 
    3030 
    3131The models presented here updates the models derived from 33 empirical estimates of the consumption/biomass ratio (''Q/B'') for marine fishes, and published by the same authors in 1989.