Metabolic consequences of feeding and fasting on nutritionally different diets in the wolf spider Pardosa prativaga |
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Authors: | Kim Jensen David Mayntz Tobias Wang Johannes Overgaard |
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Institution: | a Department of Zoology, University of Oxford, South Parks Road, OX1 3PS, Oxford, UK b School of Biological Sciences, University of Sydney, Heydon-Laurence Building A08, NSW 2006, Sydney, Australia c Ecology and Genetics, Department of Biological Sciences, University of Aarhus, Building 1540, 8000 Århus C, Denmark d Department of Genetics and Biotechnology, University of Aarhus, Research Centre Foulum, 8830 Tjele, Denmark e Zoophysiology, Department of Biological Sciences, University of Aarhus, Building 1131, 8000 Århus C, Denmark |
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Abstract: | We investigated whether spiders fed lipid-rich rather than protein-rich prey elevate metabolism to avoid carrying excessive lipid deposits, or whether they store ingested lipids as a buffer against possible future starvation. We fed wolf spiders (Pardosa prativaga) prey of different lipid:protein compositions and measured the metabolic rate of spiders using closed respirometry during feeding and fasting. After a 16-day feeding period, spider lipid:protein composition was significantly affected by the lipid:protein composition of their prey. Feeding caused a large and fast increase in metabolism. The cost of feeding and digestion was estimated to average 21% of the ingested energy irrespective of diet. We found no difference in basal metabolic rate between dietary treatments. During starvation and decreased gradually, and the larger lipid stores in spiders fed lipid-rich prey appeared to extend survival of these spiders under starvation compared to spiders fed protein-rich prey. The results show that these spiders do not adjust metabolism in order to maintain a constant body composition when prey nutrient composition varies. Instead, lipids are stored efficiently and help to prepare the spiders for the long periods of food deprivation that may occur as a consequence of their opportunistic feeding strategy. |
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Keywords: | Nutrient balancing Respiration Predator Starvation |
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