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Host-mediated, cross-generational intraspecific competition in a herbivore species

View ORCID ProfileBastien Castagneyrol, View ORCID ProfileInge van Halder, Yasmine Kadiri, Laura Schillé, View ORCID ProfileHervé Jactel
doi: https://doi.org/10.1101/2020.07.30.228544
Bastien Castagneyrol
1Univ. Bordeaux, INRAE, BIOGECO, F-33612 Cestas, France
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  • ORCID record for Bastien Castagneyrol
  • For correspondence: bastien.castagneyrol@inrae.fr
Inge van Halder
1Univ. Bordeaux, INRAE, BIOGECO, F-33612 Cestas, France
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Yasmine Kadiri
1Univ. Bordeaux, INRAE, BIOGECO, F-33612 Cestas, France
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Laura Schillé
1Univ. Bordeaux, INRAE, BIOGECO, F-33612 Cestas, France
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Hervé Jactel
1Univ. Bordeaux, INRAE, BIOGECO, F-33612 Cestas, France
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Abstract

Conspecific insect herbivores co-occurring on the same host plant interact both directly through interference competition and indirectly through exploitative competition, plant-mediated interactions and enemy-mediated interactions. However, the situation is less clear when the interactions between conspecific insect herbivores are separated in time within the same growing season, as it is the case for multivoltine species. We hypothesized that early season herbivory would result in reduced egg laying and reduced performance of the next generation of herbivores on previously attacked plants. We tested this hypothesis in a choice experiment with box tree moth females (Cydalima perspectalis Walker, Lepidoptera: Crambidae). These females were exposed to box trees (Buxus sempervirens L., Buxaceae) that were either undamaged or attacked by conspecific larvae earlier in the season. We then compared the performance of the next generation larvae on previously damaged vs undamaged plants. Previous herbivory had no effect on oviposition behaviour, but the weight of next generation larvae was significantly lower in previously damaged plants. There was a negative correlation between the number of egg clutches laid on plants by the first generation and the performance of the next generation larvae. Overall, our findings reveal that early season herbivory reduces the performance of conspecific individuals on the same host plant later in the growing season, and that this time-lagged intraspecific competition results from a mismatch between the oviposition preference of females and the performance of its offspring.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • Cite as: Castagneyrol B, Halder I van, Kadiri Y, Schillé L, Jactel H (2021) Host-mediated, cross-generational intraspecific competition in a herbivore species. bioRxiv,2020.07.30.228544, ver. 5 peer reviewed and recommended by PCI Ecology. https://doi.org/10.1101/2020.07.30.228544

  • Version 5 of this preprint has been peer-reviewed and recommended by Peer Community In Ecology (https://doi.org/10.24072/pci.ecology.100072)

  • https://doi.org/10.15454/KMUX39

Copyright 
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-ND 4.0 International license.
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Posted March 01, 2021.
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Host-mediated, cross-generational intraspecific competition in a herbivore species
Bastien Castagneyrol, Inge van Halder, Yasmine Kadiri, Laura Schillé, Hervé Jactel
bioRxiv 2020.07.30.228544; doi: https://doi.org/10.1101/2020.07.30.228544
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Host-mediated, cross-generational intraspecific competition in a herbivore species
Bastien Castagneyrol, Inge van Halder, Yasmine Kadiri, Laura Schillé, Hervé Jactel
bioRxiv 2020.07.30.228544; doi: https://doi.org/10.1101/2020.07.30.228544

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