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- W3027227574 abstract "Abstract Trait‐based approaches have broadened our understanding of how the composition of ecological communities responds to environmental drivers. This research has mainly focussed on abiotic factors and competition determining the community trait distribution, while effects of trophic interactions on trait dynamics, if considered at all, have been studied for two trophic levels at maximum. However, natural food webs are typically at least tritrophic. This enables indirect interactions of traits and biomasses among multiple trophic levels leading to underexplored effects on food web dynamics. Here, we demonstrate the occurrence of mutual trait adjustment among three trophic levels in a natural plankton food web (Lake Constance) and in a corresponding mathematical model. We found highly recurrent seasonal biomass and trait dynamics, where herbivorous zooplankton increased its size, and thus its ability to counter phytoplankton defense, before phytoplankton defense actually increased. This is contrary to predictions from bitrophic systems where counter‐defense of the consumer is a reaction to prey defense. In contrast, counter‐defense of carnivores by size adjustment followed the defense of herbivores as expected. By combining observations and model simulations, we show how the reversed trait dynamics at the two lower trophic levels result from a “trophic biomass–trait cascade” driven by the carnivores. Trait adjustment between two trophic levels can therefore be altered by biomass or trait changes of adjacent trophic levels. Hence, analyses of only pairwise trait adjustment can be misleading in natural food webs, while multitrophic trait‐based approaches capture indirect biomass–trait interactions among multiple trophic levels." @default.
- W3027227574 created "2020-05-29" @default.
- W3027227574 creator A5031539832 @default.
- W3027227574 creator A5082513649 @default.
- W3027227574 date "2020-05-18" @default.
- W3027227574 modified "2023-09-26" @default.
- W3027227574 title "Coupled changes in traits and biomasses cascading through a tritrophic plankton food web" @default.
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- W3027227574 doi "https://doi.org/10.1002/lno.11466" @default.
- W3027227574 hasPublicationYear "2020" @default.
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