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Intraspecific difference among herbivore lineages and their host-plant specialization drive the strength of trophic cascades

Arnaud Sentis, Raphaël Bertram, Nathalie Dardenne, Jean-Christophe Simon, Alexandra Magro, Benoit Pujol, Etienne Danchin, Jean-Louis Hemptinne
doi: https://doi.org/10.1101/722140
Arnaud Sentis
1UMR 5174; EDB, CNRS, Université Toulouse III, IRD, Toulouse, France
4INRAE, Aix Marseille Univ., UMR RECOVER, 13182 Aix-en-Provence, France
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  • For correspondence: arnaud.sentis@inrae.fr
Raphaël Bertram
1UMR 5174; EDB, CNRS, Université Toulouse III, IRD, Toulouse, France
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Nathalie Dardenne
1UMR 5174; EDB, CNRS, Université Toulouse III, IRD, Toulouse, France
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Jean-Christophe Simon
2UMR 1349; IGEPP, INRAE, Université Rennes 1, Le Rheu, France
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Alexandra Magro
1UMR 5174; EDB, CNRS, Université Toulouse III, IRD, Toulouse, France
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Benoit Pujol
3PSL Université Paris: EPHE-UPVD-CNRS, USR 3278 CRIOBE, Uni. Perpignan, France
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Etienne Danchin
1UMR 5174; EDB, CNRS, Université Toulouse III, IRD, Toulouse, France
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Jean-Louis Hemptinne
1UMR 5174; EDB, CNRS, Université Toulouse III, IRD, Toulouse, France
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Abstract

Trophic cascades—the indirect effect of predators on non-adjacent lower trophic levels—are important drivers of the structure and dynamics of ecological communities. However, the influence of intraspecific trait variation on the strength of trophic cascade remains largely unexplored, which limits our understanding of the mechanisms underlying ecological networks. Here we experimentally investigated how intraspecific difference among herbivore lineages specialized on different host plants influences the strength of trophic cascade in a terrestrial tritrophic system. We found that the occurrence and strength of the trophic cascade are strongly influenced by herbivores’ lineage and host-plant specialization but are not associated with density-dependent effects mediated by the growth rate of herbivore populations. Our findings stress the importance of intraspecific heterogeneities and evolutionary specialization as drivers of the strength of trophic cascades and underline that intraspecific variation should not be overlooked to decipher the joint influence of evolutionary and ecological factors on the functioning of multi-trophic interactions.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC 4.0 International license.
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Posted March 20, 2020.
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Intraspecific difference among herbivore lineages and their host-plant specialization drive the strength of trophic cascades
Arnaud Sentis, Raphaël Bertram, Nathalie Dardenne, Jean-Christophe Simon, Alexandra Magro, Benoit Pujol, Etienne Danchin, Jean-Louis Hemptinne
bioRxiv 722140; doi: https://doi.org/10.1101/722140
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Intraspecific difference among herbivore lineages and their host-plant specialization drive the strength of trophic cascades
Arnaud Sentis, Raphaël Bertram, Nathalie Dardenne, Jean-Christophe Simon, Alexandra Magro, Benoit Pujol, Etienne Danchin, Jean-Louis Hemptinne
bioRxiv 722140; doi: https://doi.org/10.1101/722140

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