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- W2899033044 abstract "Rationale Stable isotopic analysis is extensively used in trophic ecology. Inorganic carbonates, usually originating from shell fragments, are routinely removed from samples using an acid treatment because they affect δ 13 C values. However, acid treatment can also change δ 15 N values. For some taxa such as molluscs, the general assumption is that acid pre‐treatment is not necessary since their shell is easily dissected from soft tissues and represents the only source of inorganic carbonates. However, other sources of non‐dietary carbon (e.g., intracellular inorganic carbon) enriched in 13 C thus get overlooked. Methods Soft tissues (foot) of the invasive gastropod Crepidula fornicata of different size classes were analysed for their δ 13 C and δ 15 N values with and without acid pre‐treatment using isotope ratio mass spectrometry. In toto microscopic investigations coupled with acid treatment, scanning electron microscopy and energy‐dispersive spectroscopy were used to highlight the presence of inorganic carbonate. A correction model was derived and applied to existing stable isotope data for C. fornicata . We used both seasonal variations in δ 13 C signatures and mixing model outputs to assess the error in δ 13 C values. Results Acid pre‐treatment had a significant effect on the stable isotope compositions of C. fornicata foot tissue, especially on δ 13 C values: isotopic differences increased with size, up to 3‰ for large females. No effect was detected for small (below ~20 mm) and motile males. In toto microscopic analysis revealed the presence of small spherules of inorganic carbonate, hence explaining the differences in δ 13 C values. Mixing model outputs and seasonal variation of δ 13 C values showed that untreated samples can lead to large misinterpretations about diet proportions and degree of trophic niche overlap, respectively. Conclusions Spherules of inorganic carbonate in C. fornicata soft tissues are likely to be linked with the motility of this species and their mucus production. We recommend assessing the presence of inorganic carbonate in soft tissue of sessile gastropods." @default.
- W2899033044 created "2018-11-09" @default.
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- W2899033044 date "2018-12-10" @default.
- W2899033044 modified "2023-10-12" @default.
- W2899033044 title "The dark side of soft tissues: Unexpected inorganic carbonate in the invasive slipper limpet <scp><i>Crepidula fornicata</i></scp> and its implications for stable isotope interpretations" @default.
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- W2899033044 doi "https://doi.org/10.1002/rcm.8322" @default.
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