Habitat preference of an herbivore shapes the habitat distribution of its host plant

Nicolas M. Alexandre, Parris T. Humphrey, Andrew D. Gloss, Jimmy Lee, Joseph Frazier, Henry A. Affeldt, Noah K Whiteman

Research output: Contribution to journalArticle

Abstract

Plant distributions can be limited by habitat-biased herbivory, but the proximate causes of such biases are rarely known. Distinguishing plant-centric from herbivore-centric mechanisms driving differential herbivory between habitats is difficult without experimental manipulation of both plants and herbivores. Here, we tested alternative hypotheses driving habitat-biased herbivory in bittercress (Cardamine cordifolia), which is more abundant under the shade of shrubs and trees (shade) than in nearby meadows (sun) where herbivory is intense from the specialist fly Scaptomyza nigrita. This system has served as a textbook example of habitat-biased herbivory driving a plant's distribution across an ecotone, but the proximate mechanisms underlying differential herbivory are still unclear. First, we found that higher S. nigrita herbivory in sun habitats contrasts sharply with their preference to attack plants from shade habitats in laboratory-choice experiments. Second, S. nigrita strongly preferred leaves in simulated sun over simulated shade habitats, regardless of plant source habitat. Thus, herbivore preference for brighter, warmer habitats overrides their preference for more palatable shade plants. This promotes the sun-biased herbivore pressure that drives the distribution of bittercress into shade habitats.

Original languageEnglish (US)
Article numbere02372
JournalEcosphere
Volume9
Issue number9
DOIs
StatePublished - Sep 1 2018

Fingerprint

habitat preferences
habitat selection
host plant
herbivore
herbivores
host plants
herbivory
habitat
habitats
shade
Scaptomyza
distribution
Cardamine
shade trees
textbook
ecotone
ecotones
meadow
meadows
shrub

Keywords

  • bittercress
  • Brassicaceae
  • Drosophilidae
  • herbivory
  • leaf miner
  • zero-inflated counts

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology

Cite this

Alexandre, N. M., Humphrey, P. T., Gloss, A. D., Lee, J., Frazier, J., Affeldt, H. A., & Whiteman, N. K. (2018). Habitat preference of an herbivore shapes the habitat distribution of its host plant. Ecosphere, 9(9), [e02372]. https://doi.org/10.1002/ecs2.2372

Habitat preference of an herbivore shapes the habitat distribution of its host plant. / Alexandre, Nicolas M.; Humphrey, Parris T.; Gloss, Andrew D.; Lee, Jimmy; Frazier, Joseph; Affeldt, Henry A.; Whiteman, Noah K.

In: Ecosphere, Vol. 9, No. 9, e02372, 01.09.2018.

Research output: Contribution to journalArticle

Alexandre, NM, Humphrey, PT, Gloss, AD, Lee, J, Frazier, J, Affeldt, HA & Whiteman, NK 2018, 'Habitat preference of an herbivore shapes the habitat distribution of its host plant', Ecosphere, vol. 9, no. 9, e02372. https://doi.org/10.1002/ecs2.2372
Alexandre NM, Humphrey PT, Gloss AD, Lee J, Frazier J, Affeldt HA et al. Habitat preference of an herbivore shapes the habitat distribution of its host plant. Ecosphere. 2018 Sep 1;9(9). e02372. https://doi.org/10.1002/ecs2.2372
Alexandre, Nicolas M. ; Humphrey, Parris T. ; Gloss, Andrew D. ; Lee, Jimmy ; Frazier, Joseph ; Affeldt, Henry A. ; Whiteman, Noah K. / Habitat preference of an herbivore shapes the habitat distribution of its host plant. In: Ecosphere. 2018 ; Vol. 9, No. 9.
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