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Spatial scale of the patchiness of plant poisons: A critical influence on foraging efficiency
journal contribution
posted on 2023-05-16, 18:18 authored by Natasha WigginsNatasha Wiggins, McArthur, C, Noel DaviesNoel Davies, Stuart McLeanStuart McLeanGeneralist mammalian browsers and folivores feed on a range of chemically different plant species, which may assist them in diluting toxins and diversifying nutrient consumption. The frequency and order in which their diets are mixed are important determinants of intake. As a result, the degree of plant heterogeneity in an environment, and the spatial scale at which this occurs, should directly influence herbivore foraging decisions. We tested whether altering the spatial scale of plants, and thus plant secondary metabolites (PSMs), affected foraging efficiency of a generalist folivore, the common brushtail possum (Trichosurus vulpecula). First, we demonstrated that possums were able to consume more from a mixed diet of two chemically different species, Eucalyptus globulus and E. tenuiramis, than when either of these species was offered alone. We then tested whether altering the spatial scale between E. globulus and E. tenuiramis, as small- or large-scale plant heterogeneity "patches," affected possum foraging behavior and, ultimately, their foraging efficiency. Possums increased their foraging efficiency when the spatial scale of plant heterogeneity was small rather than large. We argue that the ability to regularly switch diets, when plant spatial distribution is at a small scale, reduces the negative effects of PSM ingestion. We predict that the heterogeneity of plant patches, in relation to PSM distribution, and the scale at which this occurs across a landscape, are critical factors that influence foraging efficiency and, ultimately, fitness of mammalian herbivores. This research provides a fundamental link between plant chemistry, foraging, and habitat heterogeneity. © 2006 by the Ecological Society of America.
History
Publication title
EcologyVolume
87Issue
9Pagination
2236-2243ISSN
0012-9658Department/School
School of Natural SciencesPublisher
Ecological Society of AmericaPlace of publication
Washington, USARights statement
© Copyright by the Ecological Society of AmericaRepository Status
- Restricted