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    • Journal of Range Management, Volume 45 (1992)
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    Plant toxins and palatability to herbivores

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    Author
    Molyneux, R. J.
    Ralphs, M. H.
    Issue Date
    1992-01-01
    Keywords
    Oxytropis
    Astragalus
    swainsonine
    pyrrolizidine alkaloids
    weed palatability
    poisoning
    toxicity
    poisonous weeds
    Senecio
    phytotoxins
    livestock
    chemical constituents of plants
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    Citation
    Molyneux, R. J., & Ralphs, M. H. (1992). Plant toxins and palatability to herbivores. Journal of Range Management, 45(1), 13-18.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    Description
    Paper presented at the "Symposium on Ingestion of Poisonous Plants by Livestock," February 15, 1990, Reno, Nevada.
    URI
    http://hdl.handle.net/10150/644761
    DOI
    10.2307/4002519
    Additional Links
    https://rangelands.org/
    Abstract
    A complex relationship exists between the presence of toxins in a plant species and the palatability of that plant. The nature of the toxin and its concentration within the plant can generally be precisely defined, given a reasonable amount of research commitment, but the measurement of palatability, especially in livestock, is much more difficult to achieve. We hypothesize that analysis of possible roles of toxins in plants, their metabolic activity in animals, and physical and temporal distribution within the plant can be used to examine whether or not such compounds may significantly increase or reduce palatability to mammalian herbivores. Thus, if the toxin is effective in preventing predation of the plant or plant part by insect herbivores, or if it provides the plant with a competitive advantage versus other species, but does not produce adverse effects upon large mammals until significant quantities of biomass are consumed, then the toxin-palatability relationship is not significant. This concept is illustrated by examination of the toxicity produced in livestock by consumption of alkaloid-containing groundsel (Senecio) and locoweed (Astragalus and Oxytropis) species. The prevention of predation by localization of the toxin, mobilization to the site of attack, or production at a particular stage of growth provides opportunities for the application of management techniques designed to reduce exposure of livestock to natural plant toxicants.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002519
    Scopus Count
    Collections
    Journal of Range Management, Volume 45, Number 1 (January 1992)

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