Muscle and carapace tissue–diet isotope discrimination factors for the freshwater crayfish Cherax destructor

dc.contributor.authorMazumder, Den_AU
dc.contributor.authorJohansen, MPen_AU
dc.contributor.authorFry, Ben_AU
dc.contributor.authorDavis, Een_AU
dc.description.abstractThis study examined a range of diets and two tissue types (muscle and carapace, representing protein and chitin biochemistry respectively) of Cherax destructor (Clark, 1936) to allow more accurate use of isotope data in trophic source estimates. The resulting Δ13Ctissue–diet and Δ15Ntissue–diet discrimination factors of muscle and carapace tissues showed significant differences among diets. For muscle, Δ13Ctissue–diet was higher (2.11–2.33‰) when C. destructor was fed with lamb, turkey and mixed animal and plant-based diets, 1.27–1.96‰ when C. destructor was fed with beef and kangaroo diets and negative (–1.36‰) when C. destructor was fed with an aquatic meat (tuna) diet. The Δ15Ntissue–diet discrimination factors were lower for muscle when C. destructor was fed aquatic meat (0.12‰) and mixed plant–animal diets (1.67‰), but higher for terrestrial meat diets (2.79–3.74‰). The Δ13Ctissue–diet for carapace followed similar patterns to that of muscle, but Δ15Ntissue–diet values were lower for carapace than muscle. Strong correlations were observed between muscle and carapace for δ13C (r = 0.96, P < 0.0001) and δ15N (r = 0.82, P < 0.0012) across the six diets evaluated, indicating that carapace can be used as a non-lethal alternative to muscle during field sampling. © CSIRO 2017en_AU
dc.description.sponsorshipThis research was undertaken as part of a postgraduate research study at the University of New South Wales under an Australia Award program. Field research funding came from a collaborative project (FIS/2008/023) between the Australian Centre for International Agricultural Research (ACIAR), The University of New South Wales (Commissioned Agency) and the National Fisheries Authority (NFA) of PNG. Barbora Gallagher and Robert Chisari (ANSTO) assisted with stable isotope sample preparation and analysis. Micah Aranka, Joe Alois, Billy Kerowa, Havini Vira and Francis Gako from NFA provided field resources and research support. Various onsite and field assistance was provided by the staff of the Highlands Aquaculture Development Centre, the PNG National Agricultural Research Institute, the PNG University of Technology and farmers. Comments from anonymous reviewers allowed us to improve the quality of the completed manuscript.en_AU
dc.identifier.citationMazumder, D., Johansen, M. P., Fry, B., & Davis, E. (2018). Muscle and carapace tissue–diet isotope discrimination factors for the freshwater crayfish Cherax destructor. Marine and Freshwater Research, 69(1), 56-65. doi:10.1071/MF16360en_AU
dc.identifier.journaltitleMarine and Freshwater Researchen_AU
dc.publisherCSIRO Publishingen_AU
dc.subjectCarbon 13en_AU
dc.subjectNitrogen 14en_AU
dc.subjectStable isotopesen_AU
dc.subjectAquatic organismsen_AU
dc.titleMuscle and carapace tissue–diet isotope discrimination factors for the freshwater crayfish Cherax destructoren_AU
dc.typeJournal Articleen_AU
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