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Modelling crayfish population dynamics using catch data: A size-structured model

Author

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  • Sadykova, Dinara
  • Skurdal, Jostein
  • Sadykov, Alexander
  • Taugbol, Trond
  • Hessen, Dag O.

Abstract

In this study we explore a rather unique time series (1979–2002) of catch data of the crayfish Astacus astacus in Lake Steinsfjorden (SE Norway) in combination with temperature data and data on Canadian pondweed Elodea canadensis coverage. In 1977, E. canadensis was for the first time observed in the lake. Over the following years, the plant established dense covers over large parts of the shallow areas, excluding the crayfish from these areas and causing a sudden drop in population size. A size-structured model with bi-stability including a range of observed stage-specific life-cycle attributes (e.g. growth, fecundity, fertility, sex-ratio), population specific parameters and density-dependant (shelters, cannibalism, unspecified predators, competition between individuals, catch, number of traps) as well as density independent factors (temperature and Elodea coverage) were constructed to evaluate the various drivers for the population dynamics, and as a predictive tool for assessing the effects of future changes. Our model revealed that the decline primarily was due to density-dependant effect of the Elodea expansion with reduced number of hides and thus increased risk for predation and cannibalism, but also that temperature played an important role related to recruitment. The model should be relevant for crayfish stock management in general, and by demonstrating the major role of temperature, it is also relevant for predicting population responses under a changing climate. The model should also be applicable to other crustaceans and species with discrete growth and late maturation.

Suggested Citation

  • Sadykova, Dinara & Skurdal, Jostein & Sadykov, Alexander & Taugbol, Trond & Hessen, Dag O., 2009. "Modelling crayfish population dynamics using catch data: A size-structured model," Ecological Modelling, Elsevier, vol. 220(20), pages 2727-2733.
    • Handle: RePEc:eee:ecomod:v:220:y:2009:i:20:p:2727-2733
    DOI: 10.1016/j.ecolmodel.2009.07.002
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    References listed on IDEAS

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    1. Saloranta, Tuomo M. & Andersen, Tom, 2007. "MyLake—A multi-year lake simulation model code suitable for uncertainty and sensitivity analysis simulations," Ecological Modelling, Elsevier, vol. 207(1), pages 45-60.
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