Variation in the isotopic composition of striped weakfish cynoscion guatucupa of the Southwest Atlantic Ocean in response to dietary shifts

The aim of this study was to analyze the isotopic composition in muscle of striped weakfish Cynoscion guatucupa from Southwest Atlantic Ocean in order to evaluate a possible variation in δ13C and δ15N in response to dietary shifts that occur as animals grow. We also explored for isotopic evidence of...

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Detalles Bibliográficos
Autores principales: Paso Viola, M.N., Riccialdelli, L., Jaureguizar, A., Panarello, H.O., Cappozzo, H.L.
Formato: JOUR
Materias:
Cynoscion guatucupa
Diet
Ontogenetic shifts
Southwest atlantic coastal ecosystem
Stable isotopes
carbon
nitrogen
animal
Atlantic Ocean
chemistry
feeding behavior
fish
muscle
physiology
Animals
Carbon Isotopes
Feeding Behavior
Fishes
Muscles
Nitrogen Isotopes
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_15196984_v78_n2_p202_PasoViola
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_15196984_v78_n2_p202_PasoViola
record_format dspace
spelling todo:paper_15196984_v78_n2_p202_PasoViola2023-10-03T16:19:59Z Variation in the isotopic composition of striped weakfish cynoscion guatucupa of the Southwest Atlantic Ocean in response to dietary shifts Paso Viola, M.N. Riccialdelli, L. Jaureguizar, A. Panarello, H.O. Cappozzo, H.L. Cynoscion guatucupa Diet Ontogenetic shifts Southwest atlantic coastal ecosystem Stable isotopes carbon nitrogen animal Atlantic Ocean chemistry feeding behavior fish muscle physiology Animals Atlantic Ocean Carbon Isotopes Feeding Behavior Fishes Muscles Nitrogen Isotopes The aim of this study was to analyze the isotopic composition in muscle of striped weakfish Cynoscion guatucupa from Southwest Atlantic Ocean in order to evaluate a possible variation in δ13C and δ15N in response to dietary shifts that occur as animals grow. We also explored for isotopic evidence of differences between sample locations. The results showed an agreement between isotope analysis and previous conventional studies. Differences in the isotope composition between sampling location were not observed. A positive relation exists between isotope values and total body length of the animals. The Cluster analysis defined three groups of size classes, validated by the MDS. Differences in the relative consumption of prey species in each size class were also observed performing isotope mixing models (SIAR). Variation in δ15N among size classes would be associated with the consumption of a different type of prey as animals grow. Small striped weakfish feed on small crustaceans and progressively increase their consumption of fish (anchovy, Engraulis anchoita), increasing by this way their isotope values. On the other hand, differences in δ13C values seemed to be related to age-class specific spatial distribution patterns. Therefore, large and small striped weakfish remain specialized but feeding on different prey at different trophic levels. These results contribute to the study of the diet of striped weakfish, improve the isotopic ecology models and highlight on the importance of accounting for variation in the isotopic composition in response to dietary shifts with the size of one of the most important fishery resources in the region. © 2018, Instituto Internacional de Ecologia. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15196984_v78_n2_p202_PasoViola
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cynoscion guatucupa
Diet
Ontogenetic shifts
Southwest atlantic coastal ecosystem
Stable isotopes
carbon
nitrogen
animal
Atlantic Ocean
chemistry
feeding behavior
fish
muscle
physiology
Animals
Atlantic Ocean
Carbon Isotopes
Feeding Behavior
Fishes
Muscles
Nitrogen Isotopes
spellingShingle Cynoscion guatucupa
Diet
Ontogenetic shifts
Southwest atlantic coastal ecosystem
Stable isotopes
carbon
nitrogen
animal
Atlantic Ocean
chemistry
feeding behavior
fish
muscle
physiology
Animals
Atlantic Ocean
Carbon Isotopes
Feeding Behavior
Fishes
Muscles
Nitrogen Isotopes
Paso Viola, M.N.
Riccialdelli, L.
Jaureguizar, A.
Panarello, H.O.
Cappozzo, H.L.
Variation in the isotopic composition of striped weakfish cynoscion guatucupa of the Southwest Atlantic Ocean in response to dietary shifts
topic_facet Cynoscion guatucupa
Diet
Ontogenetic shifts
Southwest atlantic coastal ecosystem
Stable isotopes
carbon
nitrogen
animal
Atlantic Ocean
chemistry
feeding behavior
fish
muscle
physiology
Animals
Atlantic Ocean
Carbon Isotopes
Feeding Behavior
Fishes
Muscles
Nitrogen Isotopes
description The aim of this study was to analyze the isotopic composition in muscle of striped weakfish Cynoscion guatucupa from Southwest Atlantic Ocean in order to evaluate a possible variation in δ13C and δ15N in response to dietary shifts that occur as animals grow. We also explored for isotopic evidence of differences between sample locations. The results showed an agreement between isotope analysis and previous conventional studies. Differences in the isotope composition between sampling location were not observed. A positive relation exists between isotope values and total body length of the animals. The Cluster analysis defined three groups of size classes, validated by the MDS. Differences in the relative consumption of prey species in each size class were also observed performing isotope mixing models (SIAR). Variation in δ15N among size classes would be associated with the consumption of a different type of prey as animals grow. Small striped weakfish feed on small crustaceans and progressively increase their consumption of fish (anchovy, Engraulis anchoita), increasing by this way their isotope values. On the other hand, differences in δ13C values seemed to be related to age-class specific spatial distribution patterns. Therefore, large and small striped weakfish remain specialized but feeding on different prey at different trophic levels. These results contribute to the study of the diet of striped weakfish, improve the isotopic ecology models and highlight on the importance of accounting for variation in the isotopic composition in response to dietary shifts with the size of one of the most important fishery resources in the region. © 2018, Instituto Internacional de Ecologia. All rights reserved.
format JOUR
author Paso Viola, M.N.
Riccialdelli, L.
Jaureguizar, A.
Panarello, H.O.
Cappozzo, H.L.
author_facet Paso Viola, M.N.
Riccialdelli, L.
Jaureguizar, A.
Panarello, H.O.
Cappozzo, H.L.
author_sort Paso Viola, M.N.
title Variation in the isotopic composition of striped weakfish cynoscion guatucupa of the Southwest Atlantic Ocean in response to dietary shifts
title_short Variation in the isotopic composition of striped weakfish cynoscion guatucupa of the Southwest Atlantic Ocean in response to dietary shifts
title_full Variation in the isotopic composition of striped weakfish cynoscion guatucupa of the Southwest Atlantic Ocean in response to dietary shifts
title_fullStr Variation in the isotopic composition of striped weakfish cynoscion guatucupa of the Southwest Atlantic Ocean in response to dietary shifts
title_full_unstemmed Variation in the isotopic composition of striped weakfish cynoscion guatucupa of the Southwest Atlantic Ocean in response to dietary shifts
title_sort variation in the isotopic composition of striped weakfish cynoscion guatucupa of the southwest atlantic ocean in response to dietary shifts
url http://hdl.handle.net/20.500.12110/paper_15196984_v78_n2_p202_PasoViola
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