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The continuum of plant responses to herbivory: the influence of plant association, nutrient availability and timing

Maschinski, Joyce and Whitham, Thomas G. (1989) The continuum of plant responses to herbivory: the influence of plant association, nutrient availability and timing. American Naturalist, 134 (1). pp. 1-19. ISSN 1537-5323


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Publisher’s or external URL: http://dx.doi.org/10.1086/284962


In a single population of Ipomopsis arizonica (Polemoniaceae) at Flagstaff, Arizona the degree of herbivore impact from rock squirrels (Spermophilus variegatus grammurus) grazing on rosettes, and mule deer (Odocoileus hemionus) grazing on flowering stems depended on plant association, nutrient availability and timing of grazing. From 1985 to 1987, the most common response to vertebrate herbivory was equal compensation, whereby grazed plants set numbers of fruits and seeds equal to controls. Overcompensation occurred in vertebrate-grazed plants that were supplemented with nutrients and growing free of competition, when plants produced 33-120% more fruit than ungrazed plants. Undercompensation occurred where I. arizonica grew in association with grasses or where nutrients were not supplemented. Grazed and clipped plants in these groups produced 28-82% of the fruit produced by ungrazed plants.

Item Type: Article
Publisher’s Statement: Copyright 1989 by The University of Chicago
ID number or DOI: 10.1086/284962
Keywords: angiosperms; Animal Behaviour; Animal Nutrition; Animals; APEC countries; Arizona; Artiodactyla; Biological Resources; Cervidae; Chordata; cutting; Deer; Developed Countries; dicotyledons; effects on; Environmental Tolerance of Plants; eukaryotes; grazing; herbivory; Ipomopsis; Ipomopsis arizonica; Odocoileus; Odocoileus hemionus;pasturing; Plant Ecology; Plant Production; Polemoniaceae; Responses; rodents; ruminants; Sciuridae; Sciurinae; seed set; Solanales; Southwestern States of USA; Spermatophyta; Spermophilus; Spermophilus variegatus; Vertebrates; wild animals
Subjects: Q Science > QK Botany
NAU Depositing Author Academic Status: Faculty/Staff
Department/Unit: College of Engineering, Forestry, and Natural Science > Biological Sciences
Date Deposited: 16 Oct 2015 18:55
URI: http://openknowledge.nau.edu/id/eprint/313

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