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Animal Production Science Animal Production Science Society
Food, fibre and pharmaceuticals from animals
REVIEW

Translating physiological signals to changes in feeding behaviour in mammals and the future effects of global climate change

Ben D. Moore A D , Natasha L. Wiggins B , Karen J. Marsh C , M. Denise Dearing B and William J. Foley C
+ Author Affiliations
- Author Affiliations

A Hawkesbury Institute for the Environment, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia.

B Department of Biology, University of Utah, Salt Lake City, UT 84103, USA.

C Research School of Biology, Australian National University, Canberra, ACT 0200, Australia.

D Corresponding author. Email: B.Moore@uws.edu.au

Animal Production Science 55(3) 272-283 https://doi.org/10.1071/AN14487
Submitted: 7 April 2014  Accepted: 7 October 2014   Published: 5 February 2015

Abstract

Mammals cannot avoid ingesting secondary metabolites, often in significant amounts. Thus, their intake must be regulated to avoid intoxication. Three broad mechanisms have been described by which this can be achieved. These are conditioned aversions mediated by nausea, non-conditioned aversions and the recognition of limits to detoxification. Although there is some overlap between these, we know little about the way that mechanisms of toxin avoidance interact with regulation of nutrient intake and whether one has priority over the other. Nonetheless, regulation of meal length and inter-meal length allows the intake of some plant secondary metabolites to be matched with an animal’s capacity for detoxification and its nutritional requirements. Toxicity itself is not a fixed limitation and recent work suggests that ambient temperature can be a major determinant of the toxicity of plant secondary metabolites, largely through effects on liver function. These effects are likely to be of major importance in predicting the impact of global climate change on herbivores.

Additional keywords: conditioned aversions, diet selection, heat dissipation limit hypothesis, herbivore, plant secondary metabolites, temperature-dependent toxicity.


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