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Effects of food quality on tissue-specific isotope ratios in the mussel Perna perna

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Abstract

Investigations into trophic ecology and aquatic food web resolution are increasingly accomplished through stable isotope analysis. The incorporation of dietary and metabolic changes over time results in variations in isotope signatures and turnover rates of producers and consumers at tissue, individual, population and species levels. Consequently, the elucidation of trophic relationships in aquatic systems depends on establishing standard isotope values and tissue turnover rates for the level in question. This study investigated the effect of diet and food quality on isotopic signatures of four mussel tissues: adductor muscle, gonad, gill and mantle tissue from the brown mussel Perna perna. In the laboratory, mussels were fed one of the two isotopically distinct diets for 3 months. Although not all results were significant, overall δ13C ratios in adductor, mantle and gill tissues gradually approached food source signatures in both diets. PERMANOVA analyses revealed significant changes over time in tissue δ13C (mantle and gill) with both diets and in δ15N (all tissues) and C:N ratios (mantle and gill) for one diet only. The percentage of replaced carbon isotopes were calculated for the 3 month period and differed among tissues and between diets. The tissue with the highest and lowest amount of replaced isotopes over 81 days were mantle tissue on the kelp diet (33.89%) and adductor tissue on the fish food diet (4.14%), respectively. Percentages could not be calculated for any tissue in either diet for δ15N due to the lack of significant change in tissue nitrogen. Fractionation patterns in tissues for both diets can be linked to nutritional stress, suggesting that consumer isotopic signatures are strongly dependent on food quality, which can significantly affect the degree of isotopic enrichment within a trophic level.

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Acknowledgements

Many thanks to both Hydribiologia’s reviewers who provided constructive comments that have significantly improved the manuscript. Thanks as well to Prof. M. Villet and Dr. F. Porri, Rhodes University, South Africa for providing statistical help and direction, and to J. Lanham for isotopic analysis at the Stable Light Isotope Unit, University of Cape Town, South Africa. This study is based upon research supported by the South African Research Chairs Initiative of the Department of Science and Technology and National Research Foundation.

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  1. Department of Zoology & Entomology, Coastal Research Group, Rhodes University, PO Box 94, Grahamstown, 6140, South Africa

    Jaclyn M. Hill & Christopher D. McQuaid

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Hill, J.M., McQuaid, C.D. Effects of food quality on tissue-specific isotope ratios in the mussel Perna perna . Hydrobiologia 635, 81–94 (2009). https://doi.org/10.1007/s10750-009-9865-y

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