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Overcompensation in response to mammalian herbivory - the advantage of being eaten

Paige, Ken N. and Whitham, Thomas G. (1987) Overcompensation in response to mammalian herbivory - the advantage of being eaten. American Naturalist, 129 (3). pp. 407-416. ISSN 1537-5323

Paige_K_Whitham_T_1987_Overcompensation_in_Response_to_Mammalian_Herbivory_the_Advantage_of_Being_Eaten(1).pdf - Published Version

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Publisher’s or external URL: http://dx.doi.org/10.1086/284645


Plants of scarlet gilia, Ipomopsis aggregata, are exposed to high levels of mammalian herbivory (by mule deer, Odocoileus hemionus, and elk, Cervus elaphus) early in the season, before flowering. During this period of our study, up to 56% of all individuals experienced a 95% reduction in aboveground biomass. Browsed plants rapidly responded by producing new inflorescences and flowering within 3 wk. Unbrowsed plants produced only single inflorescences, whereas browsed plants produced multiple inflorescences. Field observations and experimental manipulations showed that plants with multiple inflorescences produced significantly greater numbers of flowers and fruits than unbrowsed individuals. Because there were no differences between browsed and unbrowsed individuals in the number of seeds produced per fruit, seed weight, subsequent germination success, and survival, browsed plants enjoyed a 2.4-fold increase in relative fitness. Consequently, there is an immediate reproductive advantage to being eaten. Under the natural field conditions of this study, mammalian herbivores played a beneficial role in the survival and reproductive success of scarlet gilia.

Item Type: Article
Publisher’s Statement: © 1987 by The University of Chicago
ID number or DOI: 10.1086/284645
Subjects: Q Science > QL Zoology
NAU Depositing Author Academic Status: Faculty/Staff
Department/Unit: College of Engineering, Forestry, and Natural Science > Biological Sciences
Date Deposited: 23 Feb 2016 22:41
URI: http://openknowledge.nau.edu/id/eprint/314

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