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From patterns to processes and back: analysing density-dependent responses to an abiotic stressor by statistical and mechanistic modelling

Moe, S. Jannicke, Kristoffersen, Anja B., Smith, Robert H. and Stenseth, Nils Chr. (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 of London Part B Biological Sciences, 272 (1577). pp. 2133-2142. ISSN 0962-8452

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Our knowledge about population-level effects of abiotic stressors is limited, largely due to lack of appropriate time-series data. To analyse interactions between an abiotic stressor and density-dependent processes, we used experimental time-series data for stage-structured populations (the blowfly Lucilia sericata) exposed to the toxicant cadmium through 20 generations. Resource limitation results in competition both in the larval and the adult stages. The toxicant has only negative effects at the organism level, but nevertheless, there were positive population-level effects. These are necessarily indirect, and indicate overcompensatory density-dependent responses. A non-parametric model (generalized additive model) was used to investigate the density-dependent structures of the demographic rates, without making assumptions about the functional forms. The estimated structures were used to develop a parametric model, with which we analysed effects of the toxicant on density-dependent and density-independent components of the stage-specific demographic rates. The parameter estimates identified both synergistic and antagonistic density–toxicant interactions. It is noteworthy that the synergistic interaction occurred together with a net positive effect of the toxicant. Hence, the effects of such interactions should be considered together with the capacity for compensatory responses. The combination of the two modelling approaches provided new insight into mechanisms for compensatory responses to abiotic stressors.

Item Type: Article
Additional Information: © 2005 The Royal Society
Uncontrolled Keywords: non-parametric modelling, generalized additive modelling, time-series analysis, stage-specific density dependence, density–toxicant interaction
Subjects: Q Science > Q Science (General)
Q Science > QR Microbiology
Schools: School of Applied Sciences

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Depositing User: Sara Taylor
Date Deposited: 08 Jun 2007
Last Modified: 28 Jul 2010 18:20


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