Intraspecific difference among herbivore lineages and their host-plant specialization drive the strength of trophic cascades.
Evo-to-eco
genetic variation
herbivory
host-plant adaptation
indirect effects
tri-trophic interactions
Journal
Ecology letters
ISSN: 1461-0248
Titre abrégé: Ecol Lett
Pays: England
ID NLM: 101121949
Informations de publication
Date de publication:
Aug 2020
Aug 2020
Historique:
received:
03
04
2020
revised:
08
04
2020
accepted:
10
04
2020
pubmed:
13
5
2020
medline:
8
7
2020
entrez:
13
5
2020
Statut:
ppublish
Résumé
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 trophic cascade strength in a terrestrial tri-trophic 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 trophic cascade strength 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.
Types de publication
Letter
Langues
eng
Sous-ensembles de citation
IM
Pagination
1242-1251Subventions
Organisme : Agence Nationale de la Recherche
ID : ANR-10-LABX-25-01
Organisme : Agence Nationale de la Recherche
ID : ANR-10-LABX-41
Organisme : Campus France
Informations de copyright
© 2020 John Wiley & Sons Ltd/CNRS.
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