Fishing triggers trophic cascade in terms of variation, not abundance, in an allometric trophic network model
Uusi-Heikkilä, S., Perälä, T., & Kuparinen, A. (2022). Fishing triggers trophic cascade in terms of variation, not abundance, in an allometric trophic network model. Canadian Journal of Fisheries and Aquatic Sciences, 79(6), 947-957. https://doi.org/10.1139/cjfas-2021-0146
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Canadian Journal of Fisheries and Aquatic SciencesDate
2022Copyright
© 2021 the Authors
Trophic cascade studies often rely on linear food chains instead of complex food webs and are typically measured as biomass averages, not as biomass variation. We study trophic cascades propagating across a complex food web including a measure of biomass variation in addition to biomass average. We examined whether different fishing strategies induce trophic cascades and whether the cascades differ from each other. We utilized an allometric trophic network (ATN) model to mechanistically study fishing-induced changes in food-web dynamics. Different fishing strategies did not trigger traditional, reciprocal trophic cascades, as measured in biomass averages. Instead, fishing triggered a variation cascade that propagated across the food web including fish, zooplankton and phytoplankton species. In fisheries that removed a large amount of top-predatory and cannibalistic fish, the biomass oscillations started to decrease after fishing was started. In fisheries that mainly targeted large planktivorous fish, the biomass oscillations did not dampen, but slightly increased over time. Removing species with specific ecological functions might alter the food web dynamics and potentially affect the ecological resilience of aquatic ecosystems.
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Canadian Science PublishingISSN Search the Publication Forum
0706-652XKeywords
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https://converis.jyu.fi/converis/portal/detail/Publication/102324674
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Related funder(s)
European Commission; Research Council of FinlandFunding program(s)
ERC Consolidator Grant; Academy Research Fellow, AoF; Academy Project, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about funding
This study was funded by Finnish Cultural Foundation (SUH), Academy of Finland (SUH grant #325107, AK grant #317495), Natural Sciences and Engineering Research Council of Canada (AK), and the European Research Council (COMPLEX-FISH 770884 to AK).License
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