Biokinetics and discrimination factors for delta C-13 and delta N-15 in the omnivorous freshwater crustacean, Cherax destructor

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dc.contributor.authorCarolan, JVen_AU
dc.contributor.authorMazumder, Den_AU
dc.contributor.authorDimovski, Cen_AU
dc.contributor.authorDiocares, Ren_AU
dc.contributor.authorTwining, JRen_AU
dc.date.accessioned2014-03-24T01:47:31Zen_AU
dc.date.available2014-03-24T01:47:31Zen_AU
dc.date.issued2012-10-29en_AU
dc.date.statistics2014-03-24en_AU
dc.description.abstractKnowledge and understanding of biokinetics and discrimination factors for carbon-13 (delta C-13) and nitrogen-15 (delta N-15) are important when using stable isotopes for food-web studies. Therefore, we performed a controlled laboratory diet-switch experiment to examine diet-tissue and diet-faeces discrimination factors as well as the biokinetics of stable-isotope assimilation in the omnivorous freshwater crustacean, Cherax destructor. The biokinetics of delta C-13 could not be established; however, the delta N-15 value of C. destructor tissue reached equilibrium after 80 +/- 35 days, with an estimated biological half-time for N-15 of 19 +/- 5 days. Metabolic activity contributed to the turnover of N-15 by nearly an order of magnitude more than growth. The diet-tissue discrimination factors at the end of the exposure were estimated as -1.1 +/- 0.5% for delta C-13 and +1.5 +/- 1.0% for delta N-15, indicating that a delta N-15 diet-tissue discrimination factor different from the typically assumed +3.4% may be required for freshwater macroinvertebrates such as C. destructor. The diet-faeces discrimination factor for delta N-15 after 120 days was estimated as +0.9 +/- 0.5%. The present study provides an increased understanding of the biokinetics and discrimination factors for a keystone freshwater macroinvertebrate that will be valuable for future food-web studies in freshwater ecosystems. © 2012, CSIRO Publishing.en_AU
dc.identifier.citationCarolan, J. V., Mazumder, D., Dimovski, C., Diocares, R., & Twining, J. (2012). Biokinetics and discrimination factors for delta C-13 and delta N-15 in the omnivorous freshwater crustacean, Cherax destructor. Marine and Freshwater Research, 63(10), 878-886. doi:10.1071/MF11240en_AU
dc.identifier.govdoc4740en_AU
dc.identifier.issn1323-1650en_AU
dc.identifier.issue10en_AU
dc.identifier.journaltitleMarine and Freshwater Researchen_AU
dc.identifier.pagination878en_AU
dc.identifier.urihttp://dx.doi.org/10.1071/MF11240en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5280en_AU
dc.identifier.volume63en_AU
dc.language.isoenen_AU
dc.publisherCSIRO Publishingen_AU
dc.subjectFractionationen_AU
dc.subjectAquatic ecosystemsen_AU
dc.subjectCrustaceansen_AU
dc.subjectStable isotopesen_AU
dc.subjectNitrogen 15en_AU
dc.subjectAquatic organismsen_AU
dc.subjectCarbon 13en_AU
dc.titleBiokinetics and discrimination factors for delta C-13 and delta N-15 in the omnivorous freshwater crustacean, Cherax destructoren_AU
dc.typeJournal Articleen_AU
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