Bifurcation diagram of the Ricker model with carrying capacity of 1000

The Ricker model, named after Bill Ricker, is a classic discrete population model which gives the expected number Nt+1 (or density) of individuals in generation t + 1 as a function of the number of individuals in the previous generation,

N t + 1 = N t e r ( 1 − N t k ) . {\displaystyle N_{t+1}=N_{t}e^{r\left(1-{\frac {N_{t}}{k}}\right)}.\,}

Here r is interpreted as an intrinsic growth rate and k as the carrying capacity of the environment. Unlike some other models like the Logistic map, the carrying capacity in the Ricker model is not a hard barrier that cannot be exceeded by the population, but it only determines the overall scale of the population. The Ricker model was introduced in 1954 by Ricker in the context of stock and recruitment in fisheries.

The model can be used to predict the number of fish that will be present in a fishery. Subsequent work has derived the model under other assumptions such as scramble competition, within-year resource limited competition or even as the outcome of source-sink Malthusian patches linked by density-dependent dispersal. The Ricker model is a limiting case of the Hassell model which takes the form

N t + 1 = k 1 N t ( 1 + k 2 N t ) c . {\displaystyle N_{t+1}=k_{1}{\frac {N_{t}}{\left(1+k_{2}N_{t}\right)^{c}}}.}

When c = 1, the Hassell model is simply the Beverton–Holt model.

See also

Notes

  • Brännström A and Sumpter DJ (2005) 11 July 2007 at the Wayback Machine Proc Biol Sci., 272(1576): 2065–72.
  • Bravo de la Parra, R., Marvá, M., Sánchez, E. and Sanz, L. (2013) . Math Model Nat Phenom. 8(6). pp 107–129
  • Geritz SA and Kisdi E (2004). . J Theor Biol., 21 May 2004;228(2):261–9.
  • Marvá, M., Sánchez, E., Bravo de la Parra, R., Sanz, L. (2009). . J Theor Biol.. 258(371-379).
  • Noakes, David L. G. (Ed.) (2006) シュプリンガー・ジャパン株式会社, ISBN 978-1-4020-4707-7.
  • Ricker, W. E. (1954) Journal of the Fisheries Research Board of Canada, 11(5): 559–623. doi:
  • Ricker, W. E. (1975) Computation and Interpretation of Biological Statistics of Fish Populations. Bulletin of the Fisheries Research Board of Canada, No 119. Ottawa.