Navigating Deeply Uncertain Tradeoffs in Harvested Predator-Prey Systems

Table 1

Description, values in the assumed state of the world (SOW), and ranges of sampled uncertain model parameters. The fishery harvesting plans are optimized to a system assumed to be described by the base values and then re-evaluated in 4,000 alternative SOWs generated by a Latin Hypercube Sample across the parameter ranges listed in the table (minimum and maximum).

Parameter	Description	Unit	Base value	Minimum	Maximum
α	Rate at which the prey is available to the predator		0.005	0.002	2
b	Prey growth rate		0.5	0.005	1
c	Rate with which consumed prey is converted to predator abundance		0.5	0.2	1
d	Predator death rate		0.1	0.05	0.2
h	Handling time (time each predator needs to consume the caught prey)		0.1	0.001	1
K	Prey carrying capacity given its environmental conditions		2000	100	5000
m	Predator interference parameter		0.7	0.1	1.5
	Standard deviation of stochastic noise in prey population		0.004	0.001	0.01
	Standard deviation of stochastic noise in predator population		0.004	0.001	0.01

The units of these parameters depend on the units used to measure prey (x) and predator (y) abundance. If prey and predator abundance is measured in volume then these units would equivalently change.