Size related changes in sagitta otoliths of Australoheros facetus (Pisces; Cichlidae) from South America

The Australoheros facetus, locally known as 'chanchita', is the southernmost (38 o44′S) distributed cichlid species in South America where it is eurytopic and abundant in the pampasic 'laguna', and an important dietary component of numerous piscivorous fishes and birds. The objec...

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Detalles Bibliográficos
Autores principales: González Naya, María Jimena Aída, Tombari, Andrea Diana, Volpedo, Alejandra
Publicado: 2012
Materias:
Aves
Cichlidae
Pisces
Sagitta
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01758659_v28_n5_p752_GonzalezNaya
http://hdl.handle.net/20.500.12110/paper_01758659_v28_n5_p752_GonzalezNaya
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_01758659_v28_n5_p752_GonzalezNaya
record_format dspace
spelling paper:paper_01758659_v28_n5_p752_GonzalezNaya2023-06-08T15:19:02Z Size related changes in sagitta otoliths of Australoheros facetus (Pisces; Cichlidae) from South America González Naya, María Jimena Aída Tombari, Andrea Diana Volpedo, Alejandra Aves Cichlidae Pisces Sagitta The Australoheros facetus, locally known as 'chanchita', is the southernmost (38 o44′S) distributed cichlid species in South America where it is eurytopic and abundant in the pampasic 'laguna', and an important dietary component of numerous piscivorous fishes and birds. The objective of the present study was to extend and correct the description of sagitta otoliths of Australoheros facetus and evaluate the occurrence of morphological and morphometric changes at different development stages. The sagittae were described morphologically and the morphometric analyses performed using the regression equation of allometric growth and discriminant analysis. The results of this analysis indicate that the sagitta of A. facetus acquires its definitive shape at 60mm maturity, laboratory standard length (LS), which is near the lower limit of the size range achieved in laboratory conditions. The main difference compared to individuals below 60mm LS can be seen in the general shape, type of dorsal and ventral rims, type of cauda ending, and presence of a groove at the posterior end. The presented results on ontogenetic changes in otolith morphology can be used in studies of trophic ecology to avoid overestimating the number of prey species found in the diet of freshwater piscivorous fishes and birds. © 2012 Blackwell Verlag, Berlin. Fil:Gonzalez Naya, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tombari, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Volpedo, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01758659_v28_n5_p752_GonzalezNaya http://hdl.handle.net/20.500.12110/paper_01758659_v28_n5_p752_GonzalezNaya
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Aves
Cichlidae
Pisces
Sagitta
spellingShingle Aves
Cichlidae
Pisces
Sagitta
González Naya, María Jimena Aída
Tombari, Andrea Diana
Volpedo, Alejandra
Size related changes in sagitta otoliths of Australoheros facetus (Pisces; Cichlidae) from South America
topic_facet Aves
Cichlidae
Pisces
Sagitta
description The Australoheros facetus, locally known as 'chanchita', is the southernmost (38 o44′S) distributed cichlid species in South America where it is eurytopic and abundant in the pampasic 'laguna', and an important dietary component of numerous piscivorous fishes and birds. The objective of the present study was to extend and correct the description of sagitta otoliths of Australoheros facetus and evaluate the occurrence of morphological and morphometric changes at different development stages. The sagittae were described morphologically and the morphometric analyses performed using the regression equation of allometric growth and discriminant analysis. The results of this analysis indicate that the sagitta of A. facetus acquires its definitive shape at 60mm maturity, laboratory standard length (LS), which is near the lower limit of the size range achieved in laboratory conditions. The main difference compared to individuals below 60mm LS can be seen in the general shape, type of dorsal and ventral rims, type of cauda ending, and presence of a groove at the posterior end. The presented results on ontogenetic changes in otolith morphology can be used in studies of trophic ecology to avoid overestimating the number of prey species found in the diet of freshwater piscivorous fishes and birds. © 2012 Blackwell Verlag, Berlin.
author González Naya, María Jimena Aída
Tombari, Andrea Diana
Volpedo, Alejandra
author_facet González Naya, María Jimena Aída
Tombari, Andrea Diana
Volpedo, Alejandra
author_sort González Naya, María Jimena Aída
title Size related changes in sagitta otoliths of Australoheros facetus (Pisces; Cichlidae) from South America
title_short Size related changes in sagitta otoliths of Australoheros facetus (Pisces; Cichlidae) from South America
title_full Size related changes in sagitta otoliths of Australoheros facetus (Pisces; Cichlidae) from South America
title_fullStr Size related changes in sagitta otoliths of Australoheros facetus (Pisces; Cichlidae) from South America
title_full_unstemmed Size related changes in sagitta otoliths of Australoheros facetus (Pisces; Cichlidae) from South America
title_sort size related changes in sagitta otoliths of australoheros facetus (pisces; cichlidae) from south america
publishDate 2012
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01758659_v28_n5_p752_GonzalezNaya
http://hdl.handle.net/20.500.12110/paper_01758659_v28_n5_p752_GonzalezNaya
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AT tombariandreadiana sizerelatedchangesinsagittaotolithsofaustraloherosfacetuspiscescichlidaefromsouthamerica
AT volpedoalejandra sizerelatedchangesinsagittaotolithsofaustraloherosfacetuspiscescichlidaefromsouthamerica
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