Interaction strengths and net effects in food web models

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dc.contributor.advisor Burnell, Gavin en
dc.contributor.advisor Emmerson, Mark C. en
dc.contributor.advisor Rachinskii, Dmitrii en Palmer, Catherine 2015-11-06T10:15:04Z 2014 2014
dc.identifier.citation Palmer, C. 2014. Interaction strengths and net effects in food web models. PhD Thesis, University College Cork. en
dc.identifier.endpage 235
dc.description.abstract Understanding how dynamic ecological communities respond to anthropogenic drivers of change such as habitat loss and fragmentation, climate change and the introduction of alien species requires that there is a theoretical framework able to predict community dynamics. At present there is a lack of empirical data that can be used to inform and test predictive models, which means that much of our knowledge regarding the response of ecological communities to perturbations is obtained from theoretical analyses and simulations. This thesis is composed of two strands of research: an empirical experiment conducted to inform the scaling of intraspecific and interspecific interaction strengths in a three species food chain and a series of theoretical analyses on the changes to equilibrium biomass abundances following press perturbations. The empirical experiment is a consequence of the difficulties faced when parameterising the intraspecific interaction strengths in a Lotka-Volterra model. A modification of the dynamic index is used alongside the original dynamic index to estimate intraspecific interactions and interspecific interaction strengths in a three species food. The theoretical analyses focused on the effect of press perturbations to focal species on the equilibrium biomass densities of all species in the community; these perturbations allow for the quantification of a species total net effect. It was found that there is a strong and consistent positive relationship between a species body size and its total net effect for a set of 97 synthetic food webs and also for the Ythan Estuary and Tuesday Lake food webs (empirically described food webs). It is shown that ecological constraints (due to allometric scaling) on the magnitude of entries in the community matrix cause the patterns observed in the inverse community matrix and thus explain the relationship between a species body mass and its total net effect in a community. en
dc.description.sponsorship European Science Foundation (EuroDIVERSITY) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2014, Catherine Palmer. en
dc.rights.uri en
dc.subject Food webs en
dc.subject Interaction strengths en
dc.subject Net effects en
dc.title Interaction strengths and net effects in food web models en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Science) en
dc.internal.availability Full text available en
dc.description.version Accepted Version
dc.contributor.funder Irish Research Council for Science Engineering and Technology en
dc.contributor.funder European Science Foundation en
dc.description.status Not peer reviewed en Biological, Earth & Environmental Sciences en
dc.check.reason This thesis is due for publication or the author is actively seeking to publish this material en
dc.check.opt-out Not applicable en
dc.thesis.opt-out false
dc.check.entireThesis Entire Thesis Restricted
dc.check.embargoformat E-thesis on CORA only en
dc.internal.conferring Spring Conferring 2015

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© 2014, Catherine Palmer. Except where otherwise noted, this item's license is described as © 2014, Catherine Palmer.
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