The continuum of plant responses to herbivory

the influence of plant association, nutrient availability, and timing

J. Maschinski, Thomas G Whitham

Research output: Contribution to journalArticle

618 Citations (Scopus)

Abstract

In a single population of Ipomopsis arizonica (Polemoniaceae), there is a continuum of compensatory responses to vertebrate herbivory. From 1985-1987, the most common response to vertebrate herbivory was equal compensation, whereby grazed plants set numbers of fruits and seeds equal to controls within the same growing season, but there were also cases of significant over- and undercompensation. In 1985 and 1987, overcompensation occurred in vertebrate-grazed plants that were supplemented with nutrients and growing free of competition. These plants produced 33% to 120% more fruit than control, ungrazed plants. Cases of undercompensation occurred in groups where I. arizonica grew in association with grasses or where nutrients were not supplemented. Grazed and clipped plants in these groups produced from 28% to 82% as many fruits as did ungrazed controls. The compensatory response of plants to grazing is probabilistic when 3 external factors are considered. The probability of compensation for herbivory decreases as competition with other plants increases, as nutrient levels decrease, and as the timing of herbivory comes later in the growing season. -from Authors

Original languageEnglish (US)
Pages (from-to)1-19
Number of pages19
JournalAmerican Naturalist
Volume134
Issue number1
DOIs
StatePublished - 1989

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nutrient availability
herbivory
plant response
herbivores
vertebrates
vertebrate
fruit
fruits
Ipomopsis
nutrients
nutrient
Polemoniaceae
growing season
grazing
grasses
grass
seed
seeds

ASJC Scopus subject areas

  • Ecology

Cite this

The continuum of plant responses to herbivory : the influence of plant association, nutrient availability, and timing. / Maschinski, J.; Whitham, Thomas G.

In: American Naturalist, Vol. 134, No. 1, 1989, p. 1-19.

Research output: Contribution to journalArticle

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