Changes in isotopic composition of red drum ( Sciaenops ocellatus) larvae in response to dietary shifts: potential applications to settlement studies
The stable isotope composition of larval fish tissues may serve as a chemical tracer of recent settlement due to food web differences among planktonic and demersal habitats. We present the background for the utilization of δ 13 C and δ 15 N to trace settlement of red drum (Sciaenops ocellatus), an e...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://dx.doi.org/10.1139/f99-174 http://www.nrcresearchpress.com/doi/pdf/10.1139/f99-174 |
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crcansciencepubl:10.1139/f99-174 2024-06-23T07:56:25+00:00 Changes in isotopic composition of red drum ( Sciaenops ocellatus) larvae in response to dietary shifts: potential applications to settlement studies Herzka, Sharon Z Holt, G Joan 2000 http://dx.doi.org/10.1139/f99-174 http://www.nrcresearchpress.com/doi/pdf/10.1139/f99-174 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 57, issue 1, page 137-147 ISSN 0706-652X 1205-7533 journal-article 2000 crcansciencepubl https://doi.org/10.1139/f99-174 2024-05-24T13:05:52Z The stable isotope composition of larval fish tissues may serve as a chemical tracer of recent settlement due to food web differences among planktonic and demersal habitats. We present the background for the utilization of δ 13 C and δ 15 N to trace settlement of red drum (Sciaenops ocellatus), an estuarine-dependent species. The effect of ontogeny and temperature on the relative contribution of growth and metabolic turnover to changes in isotopic composition was examined by simulating dietary shifts in the laboratory. Fractionation was examined as a function of size and the effect of food deprivation was evaluated. Published growth rates were used to estimate the time period within which the isotopic composition of a new food source should be reflected in larval tissues. In response to dietary shifts, larvae exhibited quick changes in δ 13 C and δ 15 N in a pattern closely resembling predictions based on growth alone. Fractionation values were about +1 for δ 13 C and +1.6 for δ 15 N. There was no effect of 4 days of food deprivation on δ 13 C and δ 15 N. Given the fast growth rates reported for newly settled red drum, their isotopic composition should exhibit a shift within 1-2 days and stabilize about 10 days following settlement. Article in Journal/Newspaper Red drum Sciaenops ocellatus Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 57 1 137 147 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
description |
The stable isotope composition of larval fish tissues may serve as a chemical tracer of recent settlement due to food web differences among planktonic and demersal habitats. We present the background for the utilization of δ 13 C and δ 15 N to trace settlement of red drum (Sciaenops ocellatus), an estuarine-dependent species. The effect of ontogeny and temperature on the relative contribution of growth and metabolic turnover to changes in isotopic composition was examined by simulating dietary shifts in the laboratory. Fractionation was examined as a function of size and the effect of food deprivation was evaluated. Published growth rates were used to estimate the time period within which the isotopic composition of a new food source should be reflected in larval tissues. In response to dietary shifts, larvae exhibited quick changes in δ 13 C and δ 15 N in a pattern closely resembling predictions based on growth alone. Fractionation values were about +1 for δ 13 C and +1.6 for δ 15 N. There was no effect of 4 days of food deprivation on δ 13 C and δ 15 N. Given the fast growth rates reported for newly settled red drum, their isotopic composition should exhibit a shift within 1-2 days and stabilize about 10 days following settlement. |
format |
Article in Journal/Newspaper |
author |
Herzka, Sharon Z Holt, G Joan |
spellingShingle |
Herzka, Sharon Z Holt, G Joan Changes in isotopic composition of red drum ( Sciaenops ocellatus) larvae in response to dietary shifts: potential applications to settlement studies |
author_facet |
Herzka, Sharon Z Holt, G Joan |
author_sort |
Herzka, Sharon Z |
title |
Changes in isotopic composition of red drum ( Sciaenops ocellatus) larvae in response to dietary shifts: potential applications to settlement studies |
title_short |
Changes in isotopic composition of red drum ( Sciaenops ocellatus) larvae in response to dietary shifts: potential applications to settlement studies |
title_full |
Changes in isotopic composition of red drum ( Sciaenops ocellatus) larvae in response to dietary shifts: potential applications to settlement studies |
title_fullStr |
Changes in isotopic composition of red drum ( Sciaenops ocellatus) larvae in response to dietary shifts: potential applications to settlement studies |
title_full_unstemmed |
Changes in isotopic composition of red drum ( Sciaenops ocellatus) larvae in response to dietary shifts: potential applications to settlement studies |
title_sort |
changes in isotopic composition of red drum ( sciaenops ocellatus) larvae in response to dietary shifts: potential applications to settlement studies |
publisher |
Canadian Science Publishing |
publishDate |
2000 |
url |
http://dx.doi.org/10.1139/f99-174 http://www.nrcresearchpress.com/doi/pdf/10.1139/f99-174 |
genre |
Red drum Sciaenops ocellatus |
genre_facet |
Red drum Sciaenops ocellatus |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 57, issue 1, page 137-147 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f99-174 |
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Canadian Journal of Fisheries and Aquatic Sciences |
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57 |
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1 |
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137 |
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147 |
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1802649495332192256 |