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Generation time and the maximum growth rate for populations with age-specific fecundities and unknown juvenile survival

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  • Dillingham, Peter W.

Abstract

In age-classified population models where all parameters are known, the generation time and growth rate are calculated in a straightforward manner. For many populations, some parameters, such as juvenile survival, are difficult to estimate accurately. In a simplified population model where fecundity and survival are constant from the onset of breeding, it is known that generation time may be calculated given only adult survival, age at first reproduction, and the population growth rate. However, the assumption of constant fecundity from the onset of breeding does not hold for many populations. An extended population model allows calculation of generation time with the additional knowledge of the ratio of age-specific fecundities compared to a maximum fecundity rate. When these relative fecundities are unknown, an ad hoc adjustment to the simplified model performs well.

Suggested Citation

  • Dillingham, Peter W., 2010. "Generation time and the maximum growth rate for populations with age-specific fecundities and unknown juvenile survival," Ecological Modelling, Elsevier, vol. 221(6), pages 895-899.
    • Handle: RePEc:eee:ecomod:v:221:y:2010:i:6:p:895-899
    DOI: 10.1016/j.ecolmodel.2009.12.008
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    References listed on IDEAS

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    1. Skalski, John R. & Millspaugh, Joshua J. & Ryding, Kristen E., 2008. "Effects of asymptotic and maximum age estimates on calculated rates of population change," Ecological Modelling, Elsevier, vol. 212(3), pages 528-535.
    2. Moore, Jeffrey E. & Wallace, Bryan P. & Lewison, Rebecca L. & Zydelis, Ramúnas & Cox, Tara M. & Crowder, Larry B., 2009. "A review of marine mammal, sea turtle and seabird bycatch in USA fisheries and the role of policy in shaping management," Marine Policy, Elsevier, vol. 33(3), pages 435-451, May.
    3. Carl J. Schwarz & A. Neil Arnason, 2000. "Estimation of Age-Specific Breeding Probabilities from Capture–Recapture Data," Biometrics, The International Biometric Society, vol. 56(1), pages 59-64, March.
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