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Table 1 Definition of model variables and parameters, adapted from [ 25 ]

From: Evolutionary consequences of age-specific harvesting: age at first reproduction

Notation Description Range of value
Variables   
\(N_{0}\) Density of newborn individuals  
\(N_{1}\) Density of juvenile individuals  
\(N_{2}\) Density of small adult individuals  
\(N_{3}\) Density of large adult individuals  
Parameters   
γ Probability of early reproduction [0,1]
\(f_{2}\) Per capita annual fecundity of early reproducing individuals at age 2 years old  
\(f_{3}\) Per capita annual fecundity of late reproducing individuals at age greater than or equal to 3 years old  
\(\tilde{f}_{3}\) Per capita annual fecundity of early reproducing individuals at greater than or equal to 3 years old  
\(h_{i}\) Per capita annual harvest proportion of individuals at age i (i = 1,2,3) [0,1]
c Proportional reduction is measured by a cost  
m Constant that determines how strongly the survival of newborn is adversely affected by density in this age class  
\(s_{i}\) Per capita annual survival probabilities of individuals at age i (i = 0,1,2,3) [0,1]