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Modelling crayfish population dynamics using catch data: A size-structured
Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
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2009 (English)In: Ecological Modelling, ISSN 0304-3800, Vol. 220, no 20, 2727-2733 p.Article in journal (Refereed) Published
Abstract [en]

In this study we explore a rather unique time series (19792002) of catch data of the crayfish Astacusastacus in Lake Steinsfjorden (SE Norway) in combination with temperature data and data on Canadianpondweed 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 shallowareas, excludingthe crayfish from these areas and causing a sudden drop in population size. A size-structured modelwith 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 independentfactors (temperature and Elodea coverage) were constructed to evaluate the various drivers forthe population dynamics, and as a predictive tool for assessing the effects of future changes. Our modelrevealed that the decline primarily was due to density-dependant effect of the Elodea expansion withreduced number of hides and thus increased risk for predation and cannibalism, but also that temperatureplayed an important role related to recruitment. The model should be relevant for crayfish stockmanagement in general, and by demonstrating the major role of temperature, it is also relevant for predictingpopulation responses under a changing climate. The model should also be applicable to othercrustaceans and species with discrete growth and late maturation

Place, publisher, year, edition, pages
2009. Vol. 220, no 20, 2727-2733 p.
National Category
Biological Sciences
Research subject
Biology
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URN: urn:nbn:se:kau:diva-11279DOI: 10.1016/j.ecolmodel.2009.07.002OAI: oai:DiVA.org:kau-11279DiVA: diva2:494853
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2015-07-17Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • modern-language-association-8th-edition
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