| Changes in digestive rate of a predatory beetle over its larval stage: implications for dietary breadth. | |
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MedLine Citation:
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PMID: 19951709 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Prey and non-prey foods differ substantially in their suitability for zoophytophagous omnivores, but the relative quality of these foods depends on the stage-specific digestive capabilities of the organism in question. Quantitative (or real-time) PCR was used to amplify food-specific DNA and measure consumption rates and digestion efficiencies of four foods - two prey (Aphis glycines and Leptinotarsa decemlineata eggs) and two non-prey (Zea mays pollen and the yeast Saccharomyces cerevisiae) species - over different larval stages of Coleomegilla maculata. The amount of Z. mays pollen consumed increased as larvae aged, but not proportionately with larval size, such that consumption rates decreased uniformly with insect age. While aging larvae fed A. glycines had a similar pattern in their diminishing consumption rates, they consumed similar amounts of A. glycines regardless of age, suggesting a negative feedback mechanism for consumption of this species of aphids. Older larvae digested three of the four foods significantly more efficiently than younger larvae, the exception being larvae fed A. glycines which was digested at a similar rate throughout the larval stage. There was a significant effect of time on food quantity detected for all four species of food. We conclude that C. maculata expands its physiological capacity for digesting prey and non-prey foods as they age in order to better accommodate the increased nutritional needs of the older larvae. This strategy has important implications for the life history strategies of zoophytophagous insects and how they function within foods webs. |
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Authors:
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Jonathan G Lundgren; Donald C Weber |
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Publication Detail:
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Type: Journal Article Date: 2009-12-09 |
Journal Detail:
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Title: Journal of insect physiology Volume: 56 ISSN: 1879-1611 ISO Abbreviation: J. Insect Physiol. Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-03-08 Completed Date: 2010-05-25 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 2985080R Medline TA: J Insect Physiol Country: England |
Other Details:
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Languages: eng Pagination: 431-7 Citation Subset: IM |
Copyright Information:
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Published by Elsevier Ltd. |
Affiliation:
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USDA-ARS, North Central Agricultural Research Laboratory, 2923 Medary Avenue, Brookings, SD, USA. Jonathan.Lundgren@ars.usda.gov |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Beetles / genetics, growth & development, physiology* Digestion Feeding Behavior Kinetics Larva / genetics, growth & development, physiology* Male Predatory Behavior* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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