Document Detail

From patterns to processes and back: analysing density-dependent responses to an abiotic stressor by statistical and mechanistic modelling.
MedLine Citation:
PMID:  16191626     Owner:  NLM     Status:  MEDLINE    
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.
S Jannicke Moe; Anja B Kristoffersen; Robert H Smith; Nils Chr Stenseth
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Proceedings. Biological sciences / The Royal Society     Volume:  272     ISSN:  0962-8452     ISO Abbreviation:  Proc. Biol. Sci.     Publication Date:  2005 Oct 
Date Detail:
Created Date:  2005-09-29     Completed Date:  2006-03-28     Revised Date:  2013-06-07    
Medline Journal Info:
Nlm Unique ID:  101245157     Medline TA:  Proc Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  2133-42     Citation Subset:  IM    
Norwegian Institute for Water Research (NIVA) PO Box 173, Kjelsås, 0411 Oslo, Norway.
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MeSH Terms
Cadmium / toxicity*
Computer Simulation
Diptera / drug effects*,  physiology*
Models, Theoretical*
Population Density
Population Dynamics
Time Factors
Reg. No./Substance:

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