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Diet-tissue stable isotopic fractionation of tropical sea cucumber, Holothuria scabra

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www.jircas.affrc.go.jp
Date
2013
Author
Watanabe, Satoshi
Kodama, Masashi
Sumbing, Joemel Gentelizo
Lebata-Ramos, Maria Junemie Hazel ORCID
Page views
3,807
Subject
diet ASFA
marine invertebrates ASFA
ratios ASFA
organic matter ASFA
carbon isotopes ASFA
phytoplankton ASFA
body walls ASFA
carbon ASFA
intestines ASFA
tropical climate ASFA
calcium carbonates ASFA
nitrogen isotopes ASFA
nitrogen ASFA
Sand fish
Holothuria scabra AGROVOC
Holothurioidea AGROVOC
Taxonomic term
Bacillariophyceae GBIF
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Abstract
To provide a basis for a stable carbon and nitrogen isotope ratio \(\mathsf{(\delta^{13}C / \delta^{15}N)}\) analysis to determine the assimilated organic matter in sea cucumber, Holothuria scabra, diet-tissue fractionations were experimentally determined by mono-feeding rearing with diatom. While δ15N fractionation of the whole body wall (2.4‰) was similar to the commonly accepted value (2.6 - 4‰), δ13C fractionation of the body wall (4.2‰) showed considerable discrepancy with the commonly accepted value (0 - 1‰) due to the high content (35% dry wt/wt) of calcareous spicules (CaCO3) in the body wall, which had significantly higher δ13C (-8.6‰) than the organic fractions. Computational elimination of spicules based upon spicule content and spicule δ13C reduced the δ13C fractionation of the body wall to 1.5‰, close to the common value. δ13C fractionation after spicule removal by acid decarbonation and subsequent rinsing (3.2‰) did not agree with the common value, and δ15N fractionation was significantly elevated by decarbonation. δ15N and δ13C fractionations of the intestine (1.5 and 2.2‰, respectively) did not agree with the common values. Since δ13C and δ15N of the feces did not differ significantly from those of the diet, feces may be used to determine ingested organic matter in the wild.
URI
http://hdl.handle.net/10862/2238
Suggested Citation
Watanabe, S., Kodama, M., Sumbing, J. G., & Lebata-Ramos, M. J. H. (2013). Diet-tissue stable isotopic fractionation of tropical sea cucumber, Holothuria scabra. Japan Agricultural Research Quarterly, 47(1), 127-134. https://doi.org/10.6090/jarq.47.127 
DOI
10.6090/jarq.47.127
Type
Article
ISSN
0021-3551
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  • Journal Articles [1155]

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