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Stochastic growth reduces population fluctuations in Daphnia-algal systems

Ananthasubramaniam, Bharath and Nisbet, Roger and Nelson, William and McCauley, Edward and Gurney, William (2011) Stochastic growth reduces population fluctuations in Daphnia-algal systems. Ecology, 92 (2). pp. 362-372. ISSN 0012-9658

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Abstract

Deterministic, size-structured models are widely used to describe consumer-resource interactions. Such models typically ignore potentially large random variability in juvenile development rates. We present simple representations of this variability and show five approaches to calculating the model parameters for Daphnia pulex interacting with its algal food. Using our parameterized models of growth variability, we investigate the robustness of a recently proposed stabilizing mechanism for Daphnia populations. Growth rate variability increases the range of enrichments over which small amplitude cycles or quasi-cycles occur, thus increasing the plausibility that the underlying mechanism contributes to the prevalence of small amplitude cycles in the field and in experiments. More generally, our approach allows us to relate commonly available information on variance of development times to population stability

Item type: Article
ID code: 30364
Keywords: Daphnia, growth variability, multiple attractors, quasi-cycles, robustness, stability, stage-structured models, stochastic population dynamics , Environmental Sciences, Probabilities. Mathematical statistics, Biology, Ecology, Evolution, Behavior and Systematics
Subjects: Geography. Anthropology. Recreation > Environmental Sciences
Science > Mathematics > Probabilities. Mathematical statistics
Science > Natural history > Biology
Department: Faculty of Science > Mathematics and Statistics
Depositing user: Pure Administrator
Date deposited: 24 May 2011 14:12
Last modified: 26 Jul 2017 12:29
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URI: https://strathprints.strath.ac.uk/id/eprint/30364
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