Abstract
Using non-lethal tissue sampling for stable isotope analysis has become standard in many fields, but not for fishes, despite being desirable when species are rare or protected, when repeated sampling of individuals is required or where removal may bias other analyses. Here, we examine the utility of fish dorsal fin membrane as an alternative to muscle for analyzing δ13C and δ15N ratios in two reef fish species (blue cod Parapercis colias and spotty Notolabrus celidotus) that have differing feeding modes. Both species exhibited evidence of size-based feeding from fin δ15N values, but not from muscle. Blue cod fin δ15N increased steadily throughout the sampled size range (213–412 mm fork length), whereas spotty exhibited a distinct ontogenetic diet shift at approximately 120–140 mm fork length after which size-based feeding did not occur. Fin membrane was higher than muscle in δ13C in both species and in δ15N for blue cod, but fin δ15N was lower than muscle in spotty. The δ13C and δ15N fin–muscle offsets were constant in spotty regardless of size, while in blue cod, δ13C was constant with fish size, but δ15N offsets increased with increasing fish size. Non-lethal sampling utilizing fin tissue can be employed to estimate stable isotope values of muscle in fishes, but it is necessary to assess relationships among tissues and the effects of fish size on isotope values a priori for each species studied. Our data indicated that fin membrane may be a more sensitive tissue than muscle for detecting size-based feeding in some fish species using stable isotopes. A critical literature review revealed inconsistencies in tissue types tested, little understanding of tissue-specific trophic shift or turnover rates, and pseudo-replicated analyses leading to erroneous postulating of 1:1 relationships between tissues.
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Acknowledgments
We thank Darren Stevens and Kimberley Maxwell for their assistance with muscle and fin membrane sampling and Andrew Marriner for help with the preparation and weighing of standards and samples for CF-IRMS analysis. We are grateful to Andrew Baxter (Department of Conservation, Nelson) for his assistance in securing permission to sample within the Horoirangi Marine Reserve and to Beth Sanderson (NOAA-NMFS) for helpful suggestions and providing data for Table 2. This work was funded by the New Zealand Department of Conservation (DOC investigation number 4181) and the NIWA Capability Fund (Project CF104300).
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Communicated by C. Harrod.
Trevor J. Willis and Christopher J. Sweeting: Equal authorship.
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Willis, T.J., Sweeting, C.J., Bury, S.J. et al. Matching and mismatching stable isotope (δ13C and δ15N) ratios in fin and muscle tissue among fish species: a critical review. Mar Biol 160, 1633–1644 (2013). https://doi.org/10.1007/s00227-013-2216-6
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DOI: https://doi.org/10.1007/s00227-013-2216-6