Changes between Version 2 and Version 3 of EwEugVulnerabilitiesInEcosim


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Timestamp:
2010-01-28 16:09:01 (9 years ago)
Author:
varunr
Comment:

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  • EwEugVulnerabilitiesInEcosim

    v2 v3  
    2525'''Figure 3.2''' Relative increase in ''Q/B'' (%) as a function of predator biomass resulting from the predator biomass being halved or doubled. At high predator biomasses (i.e. near the carrying capacity for the given predator-prey interaction) a halving of predator biomass will result in nearly a doubling in the ''Q/B'' for the predator. The resulting surplus production will tend to bring the predator biomass back to the original level, and the overall effect is that the predator biomass will change only little. Conversely, a doubling of predators will cause the ''Q/B'' to be halved at high predator biomasses (resulting in very little effective change in biomass), while a doubling at low biomasses will result in only a very small reduction in ''Q/B''. 
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    27 [[Image(wiki:EwEugImages:06000025.png)]] 
     27[[Image(wiki:EwEugImages:08000025.png)]] 
    2828 
    2929'''Figure 3.3''' Simulation of flow between available (''V,,i,,'') and unavailable (''B,,i,, - V,,i,,'') prey biomass in Ecosim. ''a,,ij,,'' is the predator search rate for prey ''i'', ''v'' is the exchange rate between the vulnerable and not-vulnerable state. Fast equilibrium between the two prey states implies ''V,,i,,'' = ''vB,,i,,'' / (''2v'' + ''aB,,j,,''). Based on Walters et al. (1997).