Details

Autor(en) / Beteiligte

• Fukumori, Kayoko
• Oi, Misa
• Doi, Hideyuki
• Takahashi, Daisuke
• Okuda, Noboru
• Miller, Todd W.
• Kuwae, Michinobu
• Miyasaka, Hitoshi
• Genkai-Kato, Motomi
• Koizumi, Yoshitsugu
• Omori, Koji
• Takeoka, Hidetaka

Titel

Bivalve tissue as a carbon and nitrogen isotope baseline indicator in coastal ecosystems

Ist Teil von

• Estuarine, coastal and shelf science, 2008-08, Vol.79 (1), p.45-50

Ort / Verlag

London: Elsevier Ltd

Erscheinungsjahr

2008

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• Pinctada fucata martensii mantle tissue and gut contents were examined as baseline indicators of carbon and nitrogen isotope composition at six stations in the Uwa Sea, Japan. Substantial variations in δ 13C and δ 15N values of oysters among stations were observed, with δ 13C being consistently lower at Hiburi Island (−18.1‰) than at other stations (−17.2‰). Oysters from fish farm sites were enriched in δ 15N (8.1‰) relative to those from unaffected sites (6.8‰), suggesting that fish farming tends to increase baseline δ 15N values. The mean Δ δ 13C (0.8‰) was consistent over space and time, whereas the average Δ δ 15N slightly increased in summer. The relatively low δ 15N enrichment compared to the theoretical isotope fractionation factor (3.4‰) may be due to oyster-specific physiological attributes. Carbon and nitrogen isotope turnover rates were roughly similar within a tissue, and mantle tissue turnover rate was estimated to be 120–180 days. These results indicated that oysters are long-term integrators of δ 13C and δ 15N from their diet and that δ 13C of oysters is a more accurate bioindicator of isotopic baselines than δ 15N for marine ecological studies.