Subtle differences in the representation of consumer dynamics have large effects in marine food web models

Flynn, K. J., Speirs, D. C., Heath, M. R. and Mitra, A. ORCID: https://orcid.org/0000-0001-5572-9331 2021. Subtle differences in the representation of consumer dynamics have large effects in marine food web models. Frontiers in Marine Science 8 , 638892. 10.3389/fmars.2021.638892

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Abstract

Projecting ocean biogeochemistry and fisheries resources under climate change requires confidence in simulation models. Core to such models is the description of consumer dynamics relating prey abundance to capture, digestion efficiency and growth rate. Capture is most commonly described as a linear function of prey encounter or by rectangular hyperbola. Most models also describe consumers as eating machines which “live-to-eat,” where growth (μ) is limited by a maximum grazing rate (Gmax). Real consumers can feed much faster than needed to support their maximum growth rate (μmax); with feeding modulated by satiation, they “eat-to-live.” A set of strategic analyses were conducted of these alternative philosophies of prey consumption dynamics and testing of their effects in the StrathE2E end-to-end marine food web and fisheries model. In an experiment where assimilation efficiencies were decreased by 10%, such as might result from a change in temperature or ocean acidity, the different formulation resulted in up to 100% variation in the change in abundances of food web components, especially in the mid-trophic levels. Our analysis points to a need for re-evaluation of some long-accepted principles in consumer-resource modeling.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Additional Information:	This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY)
Publisher:	Frontiers Media
ISSN:	2296-7745
Date of First Compliant Deposit:	6 January 2022
Date of Acceptance:	25 October 2021
Last Modified:	24 May 2023 00:41
URI:	https://orca.cardiff.ac.uk/id/eprint/146400

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