| Title: | Insect herbivores can choose microclimates to achieve nutritional homeostasis |
| Author(s): | Clissold FJ; Coggan N; Simpson SJ; |
| Address: | "School of Biological Sciences, The University of Sydney, New South Wales, 2006, Australia. fiona.clissold@sydney.edu.au" |
| ISSN/ISBN: | 1477-9145 (Electronic) 0022-0949 (Linking) |
| Abstract: | "The interaction between temperature and diet quality can affect the life history of ectotherms. The rate and ratio at which protein and carbohydrate are obtained from food are important aspects of diet quality, and insects have a well-developed capacity to adjust their feeding behaviour and post-ingestive physiology to regulate intake and allocation of these nutrients. If the supply of protein and carbohydrate varies with temperature (e.g. via effects on intake, digestion or metabolism), then herbivorous insects can use thermoregulatory behaviour to help achieve nutritional homeostasis. When fed the host grass Triticum aestivum, Locusta migratoria nymphs absorbed and allocated protein and carbohydrate to growth with the same efficiency at 38 degrees C as at 32 degrees C; however, at the higher temperature, they ingested more food. In contrast, when feeding on Themeda triandra, the nymphs absorbed carbohydrate with higher efficiency at 32 degrees C, and protein at 38 degrees C. Using synthetic diets, we induced either a protein or a carbohydrate deficiency in experimental insects and showed that locusts placed in a thermal gradient following a meal of T. triandra selected 32 degrees C when deprived of carbohydrate, and 38 degrees C when deprived of protein. This capacity to use thermoregulatory behaviour to redress an imposed nutritional imbalance improved with experience of feeding on T. triandra. As predicted, locusts fed T. aestivum always chose higher temperatures, irrespective of nutritional state. Our results have consequences for understanding host-plant choice by herbivores and interpreting the effects of changed environmental temperatures and microclimate on animal-plant interactions" |
| Keywords: | Animal Nutritional Physiological Phenomena Animals Body Temperature Regulation Carbohydrate Metabolism *Herbivory Homeostasis Insect Proteins/metabolism Locusta migratoria/growth & development/*physiology Male Microclimate Poaceae/physiology Triticum/phys; |
| Notes: | "MedlineClissold, Fiona J Coggan, Nicole Simpson, Stephen J eng Research Support, Non-U.S. Gov't England 2013/02/23 J Exp Biol. 2013 Jun 1; 216(Pt 11):2089-96. doi: 10.1242/jeb.078782. Epub 2013 Feb 21" |
