Changes between Version 1 and Version 2 of EwEugVulnerabilitiesInEcosim

Timestamp:

2010-01-28 16:08:38 (15 years ago)

Author:

varunr

Comment:

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EwEugVulnerabilitiesInEcosim

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 Further reading: Walters and Juanes (1993), Walters et al. (1997), Walters and Korman 1999, and Walters and Martell (2004).
 
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 '''Figure 3.1''' Relationship between biomass of a predator and the predation mortality it causes on a given prey, as well as the corresponding ''''Q/B'''' for the given predator and prey (assuming that the predator does not reduce prey biomass substantially). Vulnerability, ''v'', is estimated as max. predation mortality/baseline predation mortality, (e.g., 5 at the leftmost stippled line). Baseline mortality is the mortality caused by the predator in the underlying Ecopath model.
 
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 '''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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 '''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).