Comparative population demography of elasmobranchs using life history tables, Leslie matrices and stage-based matrix models

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Mollet, H. F., & Cailliet, G. M. (2002). Comparative population demography of elasmobranchs using life history tables, Leslie matrices and stage-based matrix models. Marine and Freshwater Research, 53(2), 503-516. doi:10.1071/MF01083
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TitleComparative population demography of elasmobranchs using life history tables, Leslie matrices and stage-based matrix models
AuthorsF. Mollet, M. Cailliet
AbstractResults of demographic analyses of four species of elasmobranchs were compared by use of life-history tables, Leslie matrices, and several stage-based matrix models. Dasyatis violacea, with few age classes, was used to demonstrate the basics of Leslie-matrix and stage-based matrix model calculations. The demography for Carcharias taurus, with a 2-year reproductive cycle, produced higher potential population growth using actual fertility rather than effective annual fertility. The demography for Alopias pelagicus, with continuous reproduction, produced higher potential population growth for a birth-flow than a birth-pulse population. The Carcharodon carcharias example demonstrated only a small difference in potential population growth between step-like and logistic fertility functions. Stage-based models with fixed stage duration produced potential population growths identical to those obtained from a life-history table or Leslie matrix, but the net reproductive rates and generation times differed. Stage-based models with few stages had different dynamics with shorter recovery to the stable age distribution; they underestimated the elasticity of juvenile survival and overestimated the elasticity of adult survival, suggesting that interpretation should be cautious. Elasticity analyses were used to estimate the number of juvenile age classes that could be fished and have the same effect on potential population growth as fishing all the adult age classes.
JournalMarine and Freshwater Research
Date2002
Volume53
Issue2
Start page503
End page516
ISSN13231650
Subjectsdemography, life history, life table, population ecology, Alopias pelagicus, Carcharias, Carcharias taurus, Carcharodon carcharias, Dasyatis, Elasmobranchii, Pteroplatytrygon violacea
NoteCited By (since 1996):42 Fish and Fisheries, CODEN: AJMFA

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