| Diet-consumer nitrogen isotope fractionation for prolonged fasting arthropods. | |
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MedLine Citation:
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PMID: 22166153 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Nitrogen acquisition for cellular metabolism during diapause is a primary concern for herbivorous arthropods. Analyses of naturally occurring stable isotopes of nitrogen help elucidate the mechanism. Relevant articles have cited (58 times up to mid-June 2011) anomalously elevated δ(15)N (per mil deviation of (15)N/(14)N, relative to atmospheric nitrogen=0 ‰) values (diet-consumer nitrogen isotope fractionation; up to 12 ‰) for a prolonged fasting raspberry beetle (Byturus tomentosus Degeer (Coleoptera: Byturidae)), which feeds on red raspberries (Rubus idaeus: δ(15)N=∼+2 ‰). Biologists have hypothesised that extensive recycling of amino acid nitrogen is responsible for the prolonged fasting. Since this hypothesis was proposed in 1995, scientists have integrated biochemical and molecular knowledge to support the mechanism of prolonged diapausing of animals. To test the validity of the recycling hypothesis, we analysed tissue nitrogen isotope ratios for four Japanese arthropods: the shield bug Parastrachia japonensis Scott (Hemiptera: Cydnidae), the burrower bug Canthophorus niveimarginatus Scott (Hemiptera: Cydnidae), leaf beetle Gastrophysa atrocyanea Motschulsky (Coleoptera: Chrysomelidae) and the Japanese oak silkworm Antheraea yamamai (Lepidoptera: Saturniidae), all of which fast for more than 6 months as part of their life-history strategy. Resulting diet-consumer nitrogen isotope discrimination during fasting ranged from 0 to 7‰, as in many commonly known terrestrial arthropods. We conclude that prolonged fasting of arthropods does not always result in anomalous diet-consumer nitrogen isotope fractionation, since the recycling process is closed or nearly closed with respect to nitrogen isotopes. |
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Authors:
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Chitoshi Mizota; Toshiro Yamanaka |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Isotopes in environmental and health studies Volume: 47 ISSN: 1477-2639 ISO Abbreviation: Isotopes Environ Health Stud Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2011-12-14 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9602611 Medline TA: Isotopes Environ Health Stud Country: England |
Other Details:
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Languages: eng Pagination: 483-8 Citation Subset: IM |
Affiliation:
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a Faculty of Agriculture , Iwate University , Morioka , Iwate , Japan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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