NCEAS Project 6660

Stoichiometry and population dynamics of consumer-resource systems: A combined experimental and modelling approach (Hosted by NCEAS)

  • Jannicke Moe

ActivityDatesFurther Information
Postdoctoral Fellow1st October 2003—1st April 2004Participant List  
Visitor11th—25th June 2004Participant List  

Abstract
A recent approach in ecology, ecological stoichiometry, recognises resource quality (nutrient ratios) as a limiting factor in addition to resource quantity. In the proposed project, we will apply this approach to study classical population-ecological problems in a new perspective. Theoretical models of consumer-resource systems have predicted dramatic and counter-intuitive changes in population dynamics, when nutrient recycling and nutrient-limited growth are considered. However, most of these models are not yet evaluated experimentally. An important prediction is that increased phosphorous enrichment leads to more unstable population dynamics of the consumer, and eventually to extinction, although the resource persists. We will test this prediction by exposing laboratory systems of zooplankton (Daphnia) and algae to a range of phosphorous concentrations, and study the long-term dynamics of the system. Using non-parametric modelling, we aim at developing a new statistically-derived model for this system. Such models make few a priori assumptions about the form of the functions, and are therefore well-suited for exploring unknown relationships among variables. By combining such a flexible modelling approach with the stoichiometric perspective, we expect to provide new insight into general ecological problems.

TypeProducts of NCEAS Research
Presentations Chapman, P. F.; Brasfield, S.; Nacci, D. E.; Noel, H.; Carlsen, T. M.; Elmegaard, N.; Hoffmann, A.; Landis, Wayne G.; Moe, Jannicke; Spromberg, J. A. 2003. Empirical approaches to population-level assessment (interactive poster). 24th Annual Meeting of SETAC North America, 9-13 November 2003. Austin, TX.
Presentations Moe, Jannicke. 2003. Density dependence in ecological risk assessment (interactive poster). 24th Annual Meeting of SETAC North America, 9-13 November 2003. Austin, TX.
Presentations Moe, Jannicke. 2003. Ecological stoichiometry and population dynamics in consumer-resource systems (Invited by Ellen van Donk) 11 December 2003. NIOO-KNAW, Nederland.
Presentations Moe, Jannicke. 2004. Application of density dependence in population models for ecotoxicology: Why, how, and when?, 18 April 2004. ESF Scientific Programme .
Presentations Moe, Jannicke. 2004. Density dependence in ecological risk assessment, 14 February 2004. Western Washington University. Bellingham, WA.
Presentations Moe, Jannicke. 2004. Density dependence in ecological risk assessment, 2 March 2004. US EPA Atlantic Ecology Division. Narragansett, RI.
Presentations Moe, Jannicke. 2004. Density dependence in ecological risk assessment, 4 March 2004. Menzi-Cura & Associates, Inc., Environmental Consulting Firm. Boston, MA.
Presentations Moe, Jannicke. 2004. Density dependence in ecological risk assessment (platform & poster presentation). Annual Meeting of SETAC Europe. Prague, Czeck Republic, 18-22 April 2004.
Report or White Paper Moe, Jannicke. 2004. Indirect effects of stressors: An example of density dependence. SETAC Globe. Vol: 5(2). Pages 41-42.
Journal Article Moe, Jannicke; Kristoffersen, Anja B.; Smith, Robert H.; Stenseth, Nils. 2005. From patterns to processes and back: Analysing density-dependent responses to an abiotic stressor by statistical and mechanistic modelling. Proceedings of the Royal Society B-Biological Sciences. Vol: 272. Pages 2133-2142.
Journal Article Moe, Jannicke; Stelzer, R. S.; Forman, M. Rebecca; Harpole, W. Stanley; Daufresne, T.; Yoshida, T. 2005. Recent advances in ecological stoichiometry: Insights for population and community ecology. Oikos. Vol: 109. Pages 29-39.