Document Detail


Strain-specific functional and numerical responses are required to evaluate impacts on predator-prey dynamics.
MedLine Citation:
PMID:  23151643     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We use strains recently collected from the field to establish cultures; then, through laboratory studies we investigate how among strain variation in protozoan ingestion and growth rates influences population dynamics and intraspecific competition. We focused on the impact of changing temperature because of its well-established effects on protozoan rates and its ecological relevance, from daily fluctuations to climate change. We show, first, that there is considerable inter-strain variability in thermal sensitivity of maximum growth rate, revealing distinct differences among multiple strains of our model species Oxyrrhis marina. We then intensively examined two representative strains that exhibit distinctly different thermal responses and parameterised the influence of temperature on their functional and numerical responses. Finally, we assessed how these responses alter predator-prey population dynamics. We do this first considering a standard approach, which assumes that functional and numerical responses are directly coupled, and then compare these results with a novel framework that incorporates both functional and numerical responses in a fully parameterised model. We conclude that: (i) including functional diversity of protozoa at the sub-species level will alter model predictions and (ii) including directly measured, independent functional and numerical responses in a model can provide a more realistic account of predator-prey dynamics.
Authors:
Zhou Yang; Chris D Lowe; Will Crowther; Andy Fenton; Phillip C Watts; David J S Montagnes
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-11-15
Journal Detail:
Title:  The ISME journal     Volume:  7     ISSN:  1751-7370     ISO Abbreviation:  ISME J     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-22     Completed Date:  2013-11-14     Revised Date:  2014-02-04    
Medline Journal Info:
Nlm Unique ID:  101301086     Medline TA:  ISME J     Country:  England    
Other Details:
Languages:  eng     Pagination:  405-16     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Alveolata / growth & development*,  physiology
Chlorophyta / growth & development*,  physiology
Models, Theoretical*
Seawater / microbiology
Species Specificity
Temperature*
Water Microbiology
Comments/Corrections

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