Examining the utility of bulk otolith δ13C to describe diet in wild-caught black rockfish Sebastes melanops

Otolith carbon isotope δ13C values may provide temporally resolved diet proxies in fish. If otolith δ13C values reflect diet, isotope values from recent otolith and muscle tissue should correlate and known ontogenetic diet shifts should be reflected in comparisons between otolith material deposited...

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Autores principales:	VR von Biela, SD Newsome, CE Zimmerman
Formato:	article
Lenguaje:	EN
Publicado:	Inter-Research 2015
Materias:	Biology (General) QH301-705.5 Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/f1b930ffec104868ac2f5adb0951025b
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spelling	oai:doaj.org-article:f1b930ffec104868ac2f5adb0951025b2021-11-18T09:20:54ZExamining the utility of bulk otolith δ13C to describe diet in wild-caught black rockfish Sebastes melanops1864-77821864-779010.3354/ab00621https://doaj.org/article/f1b930ffec104868ac2f5adb0951025b2015-03-01T00:00:00Zhttps://www.int-res.com/abstracts/ab/v23/n3/p201-208/https://doaj.org/toc/1864-7782https://doaj.org/toc/1864-7790Otolith carbon isotope δ13C values may provide temporally resolved diet proxies in fish. If otolith δ13C values reflect diet, isotope values from recent otolith and muscle tissue should correlate and known ontogenetic diet shifts should be reflected in comparisons between otolith material deposited during different life history stages. We analyzed paired otolith and muscle samples for δ13C from black rockfish Sebastes melanops to examine the potential of otoliths to reflect diet in small (200-299 mm fork length) and large (≥300 mm) fish. We found a significant positive regression between δ13C values from recent (~12 mo) otolith material and muscle in large fish, but not in small fish. Within individual otoliths, δ13C values were enriched by ~3‰ in recent otolith edge material compared to age-0 otolith core material and were consistent with known nearshore-offshore gradients in δ13C values at the base of the food web. Bulk otolith δ13C appeared to provide a broad indicator of dietary carbon sources, but variation in metabolism and dissolved inorganic carbon δ13C among and within individuals likely influences otolith δ13C as well and limits precision. Nevertheless, the results are promising and bulk otolith δ13C may be an appropriate tool to examine large trophic and ecosystem level shifts that have occurred concurrently with changes in habitat, commercial fishing, invasive species, climate change, and other direct or indirect human impacts using historic or ancient otoliths. Future studies should continue to consider the utility of bulk otolith δ13C to describe diet in other marine fish using this simple approach.VR von BielaSD NewsomeCE ZimmermanInter-ResearcharticleBiology (General)QH301-705.5MicrobiologyQR1-502ENAquatic Biology, Vol 23, Iss 3, Pp 201-208 (2015)
institution	DOAJ
collection	DOAJ
language	EN
topic	Biology (General) QH301-705.5 Microbiology QR1-502
spellingShingle	Biology (General) QH301-705.5 Microbiology QR1-502 VR von Biela SD Newsome CE Zimmerman Examining the utility of bulk otolith δ13C to describe diet in wild-caught black rockfish Sebastes melanops
description	Otolith carbon isotope δ13C values may provide temporally resolved diet proxies in fish. If otolith δ13C values reflect diet, isotope values from recent otolith and muscle tissue should correlate and known ontogenetic diet shifts should be reflected in comparisons between otolith material deposited during different life history stages. We analyzed paired otolith and muscle samples for δ13C from black rockfish Sebastes melanops to examine the potential of otoliths to reflect diet in small (200-299 mm fork length) and large (≥300 mm) fish. We found a significant positive regression between δ13C values from recent (~12 mo) otolith material and muscle in large fish, but not in small fish. Within individual otoliths, δ13C values were enriched by ~3‰ in recent otolith edge material compared to age-0 otolith core material and were consistent with known nearshore-offshore gradients in δ13C values at the base of the food web. Bulk otolith δ13C appeared to provide a broad indicator of dietary carbon sources, but variation in metabolism and dissolved inorganic carbon δ13C among and within individuals likely influences otolith δ13C as well and limits precision. Nevertheless, the results are promising and bulk otolith δ13C may be an appropriate tool to examine large trophic and ecosystem level shifts that have occurred concurrently with changes in habitat, commercial fishing, invasive species, climate change, and other direct or indirect human impacts using historic or ancient otoliths. Future studies should continue to consider the utility of bulk otolith δ13C to describe diet in other marine fish using this simple approach.
format	article
author	VR von Biela SD Newsome CE Zimmerman
author_facet	VR von Biela SD Newsome CE Zimmerman
author_sort	VR von Biela
title	Examining the utility of bulk otolith δ13C to describe diet in wild-caught black rockfish Sebastes melanops
title_short	Examining the utility of bulk otolith δ13C to describe diet in wild-caught black rockfish Sebastes melanops
title_full	Examining the utility of bulk otolith δ13C to describe diet in wild-caught black rockfish Sebastes melanops
title_fullStr	Examining the utility of bulk otolith δ13C to describe diet in wild-caught black rockfish Sebastes melanops
title_full_unstemmed	Examining the utility of bulk otolith δ13C to describe diet in wild-caught black rockfish Sebastes melanops
title_sort	examining the utility of bulk otolith δ13c to describe diet in wild-caught black rockfish sebastes melanops
publisher	Inter-Research
publishDate	2015
url	https://doaj.org/article/f1b930ffec104868ac2f5adb0951025b
work_keys_str_mv	AT vrvonbiela examiningtheutilityofbulkotolithd13ctodescribedietinwildcaughtblackrockfishsebastesmelanops AT sdnewsome examiningtheutilityofbulkotolithd13ctodescribedietinwildcaughtblackrockfishsebastesmelanops AT cezimmerman examiningtheutilityofbulkotolithd13ctodescribedietinwildcaughtblackrockfishsebastesmelanops
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Examining the utility of bulk otolith δ13C to describe diet in wild-caught black rockfish Sebastes melanops

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