Lee, Danny C; Hyman, Jeffrey B. 1992. The Stochastic Life-Cycle Model (SLCM): simulat- 

 ing the population dynamics of anadromous salmonids. Res. Pap. INT-459. Ogden, UT: 

 U.S. Department of Agriculture, Forest Service, Intermountain Research Station. 30 p. 



A stochastic model simulating the life cycle of anadromous salmonids that mimics the 

 basic mechanisms regulating populations of Pacific salmon is presented. The SLCM 

 incorporates stochastic or probabilistic processes at each step in the life cycle. The model's 

 predictions are expressed in probabilistic terms. The model is designed to use inputs from 

 more detailed models for specific life stages, in combination with a minimum number of 

 empirically based parameters. Users can choose among three density-dependent relation- 

 ships to describe egg-to-smolt survival and among a variety of scenarios involving hatchery 

 and natural production, ranging from natural production only, to production supplemented 

 with hatchery adults or juveniles. The model is written in the SAS® programming language, 

 which allows it to be used on a variety of computing systems and enhances flexibility in 

 analyzing model output. 



KEYWORDS: Salmonidae, salmon, Oncorhynchus, population dynamics, stochastic 



models, computer simulation, viability, simulation models, Pacific Northwest 



Printed on recycled paper 



