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Oecologia

, Volume 169, Issue 2, pp 281–291 | Cite as

Food for folivores: nutritional explanations linking diets to population density

  • Ian R. Wallis
  • Melanie J. Edwards
  • Hannah Windley
  • Andrew K. Krockenberger
  • Annika Felton
  • Megan Quenzer
  • Joerg U. Ganzhorn
  • William J. Foley
Methods

Abstract

Ecologists want to explain why populations of animals are not evenly distributed across landscapes and often turn to nutritional explanations. In seeking to link population attributes with food quality, they often contrast nutritionally positive traits, such as the concentration of nitrogen, against negative ones, such as fibre concentration, by using a ratio of these traits. This specific ratio has attracted attention because it sometimes correlates with the biomass of colobine primates across sites in Asia and Africa. Although empirically successful, we have identified problems with the ratio that may explain why it fails under some conditions to predict colobine biomass. First, available nitrogen, rather than total nitrogen, is nutritionally important, while the presence of tannins is the major factor reducing the availability of nitrogen in browse plant species. Second, tannin complexes inflate measures of fibre. Finally, simple ratios may be unsound statistically because they implicitly assume isometric relationships between variables. We used data on the chemical composition of plants from three continents to examine the relationships between the concentrations of nitrogen, available nitrogen, fibre and tannins in foliage and to evaluate the nitrogen to fibre ratio. Our results suggest that the ratio of the concentration of nitrogen to fibre in leaves does sometimes closely correlate with the concentration of available nitrogen. However, the ratio may give misleading results when leaves contain high concentrations of tannins. The concentration of available nitrogen, which incorporates measures of total nitrogen, dry matter digestibility and tannins, should give a better indication of the nutritional value of leaves for herbivorous mammals that can readily be extrapolated to habitats.

Keywords

Herbivory Nitrogen Tannin Polyethylene glycol Folivore 

Notes

Acknowledgments

An ARC Discovery Grant DP0986142 to IRW and WJF funded this research. Funding from the Rainforest and Reef Research Centre through the Marine and Tropical Science Research Facility paid for the collection of the Australian rainforest samples, which Johan Larson, Rigel Jensen and Sarah Kerr helped collect. Chia Tan collected the bamboo samples and Amy Pokemner the Ugandan samples. We thank Jane Degabriel, Ben Moore and Adam Felton for helpful comments on the manuscript. WJF was supported in part by a DFG-Mercator professorship at Hamburg University. The critical comments of two anonymous reviewers improved the manuscript.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Ian R. Wallis
    • 1
  • Melanie J. Edwards
    • 1
  • Hannah Windley
    • 1
  • Andrew K. Krockenberger
    • 2
  • Annika Felton
    • 3
  • Megan Quenzer
    • 2
  • Joerg U. Ganzhorn
    • 4
  • William J. Foley
    • 1
  1. 1.Evolution, Ecology, and Genetics, Research School of BiologyThe Australian National UniversityCanberraAustralia
  2. 2.School of Marine and Tropical BiologyJames Cook University, North QueenslandCAIRNSAustralia
  3. 3.Southern Swedish Forest Research CenterSwedish University of Agricultural SciencesAlnarpSweden
  4. 4.Biozentrum GrindelUniversity of HamburgHamburgGermany

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