Skip to content

Research at St Andrews

Learning-induced switching costs in a parasitoid can maintain diversity of host aphid phenotypes although biocontrol is destabilized under abiotic stress

Research output: Contribution to journalArticle

DOI

Open Access Status

  • Embargoed (until 30/03/21)

Author(s)

Katharine Preedy, Mark A. J. Chaplain, Daniel Leybourne, Glenn Marion, Alison Karley

School/Research organisations

Abstract

1. Aphid populations frequently include phenotypes that are resistant to parasitism by hymenopterous parasitoid wasps, which is often attributed to the presence of ‘protective’ facultative endosymbionts residing in aphid tissues, particularly Hamiltonella defensa. In field conditions, under parasitoid pressure, the observed coexistence of aphids with and without protective symbionts cannot be explained by their difference in fitness alone.

2. Using the cereal aphid Rhopalosiphum padi as a model, we propose an alternative mechanism whereby parasitoids are more efficient at finding common phenotypes of aphid and experience a fitness cost when switching to the less common phenotype.

3. We construct a model based on delay differential equations and parameterise and validate the model with values within the ranges obtained from experimental studies. We then use it to explore possible effects on system dynamics under conditions of environmental stress, using our existing data on the effects of drought stress in crops as an example.

4. We show the ‘switching penalty’ incurred by parasitoids leads to stable coexistence of aphids with and without H. defensa and provides a potential mechanism for maintaining phenotypic diversity amongst host organisms. We show that drought‐induced reduction in aphid development time has little impact. However, greater reduction in fecundity on droughted plants of symbiont‐protected aphids can cause insect population cycles when the system would be stable in the absence of drought stress.

5. The stabilizing effect of the increased efficiency in dealing with more commonly encountered host phenotypes is applicable to a broad range of consumer‐resource systems and could explain stable coexistence in competitive environments. The loss of stable coexistence when drought has different effects on the competing aphid phenotypes highlights the importance of scenario testing when considering biocontrol for pest management.

Close

Details

Original languageEnglish
JournalJournal of Animal Ecology
VolumeEarly View
Early online date30 Mar 2020
DOIs
Publication statusE-pub ahead of print - 30 Mar 2020

    Research areas

  • Climate change, Drought, Hamiltonella defensa, Mathematical model, Parasitoid, Symbiont

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Bridging the gap between individual-based and continuum models of growing cell populations

    Chaplain, M. A. J., Lorenzi, T. & Macfarlane, F. R., Jan 2020, In : Journal of Mathematical Biology. 80, 1-2, p. 343-371

    Research output: Contribution to journalArticle

  2. Discrete and continuum phenotype-structured models for the evolution of cancer cell populations under chemotherapy

    Stace, R. E. A., Stiehl, T., Chaplain, M. A. J., Marciniak-Czochra, A. & Lorenzi, T., 2020, In : Mathematical Modelling of Natural Phenomena. 15, 22 p., 14.

    Research output: Contribution to journalArticle

  3. Quantitative predictive modelling approaches to understanding rheumatoid arthritis: a brief review

    Macfarlane, F. R., Chaplain, M. A. J. & Eftimie, R., 27 Dec 2019, In : Cells. 9, 1, 26 p., 74.

    Research output: Contribution to journalReview article

Related by journal

  1. A fruit diet rather than invertebrate diet maintains a robust innate immunity in an omnivorous tropical songbird

    Nwaogu, C. J., Galema, A., Cresswell, W., Dietz, M. W. & Tieleman, B. I., 6 Mar 2020, In : Journal of Animal Ecology. 89, 3, p. 867-883

    Research output: Contribution to journalArticle

  2. Environment-sensitive mass changes influence breeding in a capital breeding marine top predator

    Smout, S. C., King, R. & Pomeroy, P., 20 Nov 2019, In : Journal of Animal Ecology. Early View, 13 p.

    Research output: Contribution to journalArticle

  3. Optimizing the use of biologgers for movement ecology research

    Williams, H., Taylor, L., Benhamou, S., Bijleveld, A., Clay, T., de Grissac, S., Demsar, U., English, H., Franconi, N., Gómez-Laich, A., Griffiths, R., Kay, W., Morales, J. M., Potts, J., Rogerson, K., Rutz, C., Spelt, A., Trevail, A., Wilson, R. & Börger, L., 1 Oct 2019, In : Journal of Animal Ecology. Early View

    Research output: Contribution to journalArticle

  4. Seasonal differences in baseline innate immune function are better explained by environment than annual cycle stage in a year-round breeding tropical songbird

    Nwaogu, C. J., Cresswell, W., Versteegh, M. A. & Tieleman, B. I., 8 Apr 2019, In : Journal of Animal Ecology. 88, 4, p. 537-553 17 p.

    Research output: Contribution to journalArticle

ID: 263917453

Top