Details

Autor(en) / Beteiligte

• Winter, Emily R.
• Nolan, Emma T.
• Busst, Georgina M. A.
• Britton, J. Robert

Titel

Estimating stable isotope turnover rates of epidermal mucus and dorsal muscle for an omnivorous fish using a diet-switch experiment

Ist Teil von

• Hydrobiologia, 2019-02, Vol.828 (1), p.245-258

Ort / Verlag

Cham: Springer International Publishing

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Stable isotope (SI) analysis studies rely on knowledge of isotopic turnover rates and trophic-step discrimination factors. Epidermal mucus (‘mucus’) potentially provides an alternative SI ‘tissue’ to dorsal muscle that can be collected non-invasively and non-destructively. Here, a diet-switch experiment using the omnivorous fish Cyprinus carpio and plant- and fish-based formulated feeds compared SI data between mucus and muscle, including their isotopic discrimination factors and turnover rates (as functions of time T and mass G , at isotopic half-life ( 50 ) and equilibrium ( 95 )). Mucus isotope data differed significantly and predictively from muscle data. The fastest δ 13 C turnover rate was for mucus in fish on the plant-based diet ( T 50 : 17 days, T 95 : 74 days; G 50 : 1.08(BM), G 95 : 1.40(BM)). Muscle turnover rates were longer for the same fish ( T 50 : 44 days, T 95 : 190 days; G 50 : 1.13(BM), G 95 : 1.68(BM)). Longer half-lives resulted in both tissues from the fish-based diet. δ 13 C discrimination factors varied by diet and tissue (plant-based: 3.11–3.28‰; fishmeal: 1.28–2.13‰). Mucus SI data did not differ between live and frozen fish. These results suggest that mucus SI half-lives provide comparable data to muscle, and can be used as a non-destructive alternative tissue in fish-based SI studies.