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Identifying important species that amplify or mitigate the interactive effects of human impacts on marine food webs


Griffith, GP and Strutton, PG and Semmens, JM and Fulton, EA, Identifying important species that amplify or mitigate the interactive effects of human impacts on marine food webs, Conservation Biology, 33, (2) pp. 403-412. ISSN 0888-8892 (2018) [Refereed Article]

Copyright Statement

Copyright 2018 Society for Conservation Biology

DOI: doi:10.1111/cobi.13202


Some species may have a larger role than others in the transfer of complex effects of multiple human stressors, such as changes in biomass, through marine food webs. We devised a novel approach to identify such species. We constructed annual interaction‐effect networks (IENs) of the simulated changes in biomass between species of the southeastern Australian marine system. Each annual IEN was composed of the species linked by either an additive (sum of the individual stressor response), synergistic (lower biomass compared with additive effects), or antagonistic (greater biomass compared with additive effects) response to the interaction effect of ocean warming, ocean acidification, and fisheries. Structurally, over the simulation period, the number of species and links in the synergistic IENs increased and the network structure became more stable. The stability of the antagonistic IENs decreased and became more vulnerable to the loss of species. In contrast, there was no change in the structural attributes of species linked by an additive response. Using indices common in food‐web and network theory, we identified the species in each IEN for which a change in biomass from stressor effects would disproportionately affect the biomass of other species via direct and indirect local, intermediate, and global predator–prey feeding interactions. Knowing the species that transfer the most synergistic or antagonistic responses in a food‐web may inform conservation under increasing multiple‐stressor impacts.

Item Details

Item Type:Refereed Article
Keywords:key species, marine food-webs, interaction effect networks, climate change
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Climate variability (excl. social impacts)
UTAS Author:Griffith, GP (Dr Gary Griffith)
UTAS Author:Strutton, PG (Professor Peter Strutton)
UTAS Author:Semmens, JM (Professor Jayson Semmens)
UTAS Author:Fulton, EA (Dr Elizabeth Fulton)
ID Code:130950
Year Published:2018
Web of Science® Times Cited:4
Deposited By:Oceans and Cryosphere
Deposited On:2019-02-21
Last Modified:2019-04-08

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