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The effects of tissue type and body size on δ 13 C and δ 15 N values in parrotfish (Labridae) from Zanzibar, Tanzania
Author(s) -
PlassJohnson J. G.,
McQuaid C. D.,
Hill J. M.
Publication year - 2015
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/jai.12746
Subject(s) - biology , δ13c , isotope , muscle tissue , coral reef fish , coral reef , parrotfish , coral , perciformes , δ15n , zoology , anatomy , stable isotope ratio , fish <actinopterygii> , ecology , fishery , physics , quantum mechanics
Summary Differences between the stable isotopic ratios ( δ 13 C and δ 15 N) of two tissues (blood and muscle) from four species of East African coral reef parrotfishes (family: Labridae, tribe: Scarini) were analysed across a broad spectrum of body sizes. Comparison of isotopic ratios between the tissues allowed the assessment of using blood as an alternative tissue to muscle. In 2010–2011, constant differences between tissues ( δ blood minus δ muscle ) were found across a broad range of sampled fish lengths. Linear relationships between the tissues, specific for an isotope, indicate that constants could be generated for converting blood isotope into muscle isotope values. Only one species, Chlorurus sordidus , displayed an inconsistent difference between tissues in δ 15 N, indicating that this ratio was dependent on fish length. The δ 13 C of both tissues was positively related linearly to fish length for three species, while δ 15 N showed no relationship with body length. The results are interpreted as indicating dietary consistency over days to weeks, the time of tissue turnover for blood and muscle, respectively. Lastly, differences among the species, even closely related species, show that the generation of tissue conversion constants is species‐specific.