Density-dependent growth rate in an age-structured population: a field study on stream-dwelling brown troutSalmo trutta

2009 ◽  
Vol 74 (10) ◽  
pp. 2196-2215 ◽  
Author(s):  
R. Kaspersson ◽  
J. Höjesjö
Keyword(s):  
Growth Rate ◽  
Field Study ◽  
Density Dependent ◽  
Structured Population ◽  
Age Structured ◽  
Dependent Growth ◽  
Age Structured Population

A Stochastic Age-Structured Population Model of Striped Bass (Morone saxatilis) in the Potomac River

1983 ◽  
Vol 40 (12) ◽  
pp. 2170-2183 ◽  
Author(s):  
Joel E. Cohen ◽  
Sigurd W. Christensen ◽  
C. Phillip Goodyear
Keyword(s):  
Growth Rate ◽  
Stochastic Model ◽  
Population Size ◽  
Striped Bass ◽  
Morone Saxatilis ◽  
Potomac River ◽  
Structured Population ◽  
Age Structured ◽  
Average Population Size ◽  
Age Structured Population

Deterministic age-structured models of fish populations neglect apparently stochastic fluctuations in the catch per unit effort of yearlings and of adult fish. We describe a model of an age-structured population in which the survival of eggs to yearlings fluctuates randomly, but all other age-specific rates of survival and of egg-laying are constant. For such a stochastic model, two measures of the long-term population growth rate are the average growth rate of the population size and the growth rate of the average population size. We compute both measures analytically for a simplified model representing only eggs and reproductive adults. For a model of the striped bass (Morone saxatilis) population spawning in the Potomac River, we compute both point and interval estimates of the growth rate of the average population size. We illustrate some statistical tests of the correctness of our stochastic model.

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