Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsula

Autores
Moreira, María Eugenia; Novillo Estofan, Julio Manuel; Eastman, Joseph; Barrera Oro, Esteban
Año de publicación
2019
Idioma
español castellano
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Although many notothenioid fishes are primarily carnivorous, some species consistently feed on macroalgae and are therefore omnivorous. Among fish the degree of herbivory is usually reflected in the morphology of the gastrointestinal system especially intestine length. We examined a large number of juvenile and adult specimens of nine sympatric notothenioid species collected sequentially over eight summer seasons at Potter Cove, South Shetland Islands. We provide relative intestine lengths [RIL= (IL/SL)*100], distinct proportions of algae and animal prey in the diets (W %), and numbers of pyloric caeca for all species. The sister species Notothenia coriiceps (NOC) and N. rossii (NOR) evidenced significantly different intestinal growth over ontogeny and ate distinctly different proportions of algae and animal prey. We establish a ranking of the degree of herbivory for the fish species in the local ecosystem, and this was found to be related to their distinct feeding types and strategies. There is a correspondence between intestine length/RILs and degree of herbivory in six of the nine species analyzed but no clear association between the number of pyloric ceca and degree of omnivory or carnivory. Compared to other teleosts, our results and those in the literature, indicate modest divergence in notothenioids that includes: a phylogenetic decrease in the number of pyloric ceca, from 6–7 in most nototheniids to 2–3 in channichthyids; and a 1.8-fold difference in average relative intestine lengths which are most frequently 50–70% of body length and never exceed body length. This is consistent with the unspecialized gastrointestinal morphology that reflects the dietary and ecological plasticity of many notothenioids, exemplified by the high degree of omnivory in species such as NOC and NOR.
Fil: Moreira, María Eugenia. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Cientifico Tecnolológico Mar del Plata. Instituto de Investigaciones en Biodiversidad y Biotecnología. Laboratorio de Biología Funcional y Biotecnología; Argentina
Fil: Novillo Estofan, Julio Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Fil: Eastman, Joseph. Ohio University; Estados Unidos
Fil: Barrera Oro, Esteban. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
XVIII Congreso Latinoamericano de Ciencias del Mar - COLACMAR 2019
Mar del Plata
Argentina
Asociación Latinoamericana de Investigadores en Ciencias del Mar
Materia
Notothenioidei
Relative intestine lengths
Trophic ecology
Potter Cove
South Shetland Islands
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/157018
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsulaMoreira, María EugeniaNovillo Estofan, Julio ManuelEastman, JosephBarrera Oro, EstebanNotothenioideiRelative intestine lengthsTrophic ecologyPotter CoveSouth Shetland Islandshttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Although many notothenioid fishes are primarily carnivorous, some species consistently feed on macroalgae and are therefore omnivorous. Among fish the degree of herbivory is usually reflected in the morphology of the gastrointestinal system especially intestine length. We examined a large number of juvenile and adult specimens of nine sympatric notothenioid species collected sequentially over eight summer seasons at Potter Cove, South Shetland Islands. We provide relative intestine lengths [RIL= (IL/SL)*100], distinct proportions of algae and animal prey in the diets (W %), and numbers of pyloric caeca for all species. The sister species Notothenia coriiceps (NOC) and N. rossii (NOR) evidenced significantly different intestinal growth over ontogeny and ate distinctly different proportions of algae and animal prey. We establish a ranking of the degree of herbivory for the fish species in the local ecosystem, and this was found to be related to their distinct feeding types and strategies. There is a correspondence between intestine length/RILs and degree of herbivory in six of the nine species analyzed but no clear association between the number of pyloric ceca and degree of omnivory or carnivory. Compared to other teleosts, our results and those in the literature, indicate modest divergence in notothenioids that includes: a phylogenetic decrease in the number of pyloric ceca, from 6–7 in most nototheniids to 2–3 in channichthyids; and a 1.8-fold difference in average relative intestine lengths which are most frequently 50–70% of body length and never exceed body length. This is consistent with the unspecialized gastrointestinal morphology that reflects the dietary and ecological plasticity of many notothenioids, exemplified by the high degree of omnivory in species such as NOC and NOR.Fil: Moreira, María Eugenia. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Cientifico Tecnolológico Mar del Plata. Instituto de Investigaciones en Biodiversidad y Biotecnología. Laboratorio de Biología Funcional y Biotecnología; ArgentinaFil: Novillo Estofan, Julio Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Eastman, Joseph. Ohio University; Estados UnidosFil: Barrera Oro, Esteban. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaXVIII Congreso Latinoamericano de Ciencias del Mar - COLACMAR 2019Mar del PlataArgentinaAsociación Latinoamericana de Investigadores en Ciencias del MarAsociación Latinoamericana de Investigadores en Ciencias del Mar-2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectCongresoBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/157018Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsula; XVIII Congreso Latinoamericano de Ciencias del Mar - COLACMAR 2019; Mar del Plata; Argentina; 2019; 226-226CONICET DigitalCONICETspainfo:eu-repo/semantics/altIdentifier/url/https://rid.unrn.edu.ar/bitstream/20.500.12049/3880/3/LIBRO-DE-RESUMENES-COLACMAR-2019.pdfInternacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:23:45Zoai:ri.conicet.gov.ar:11336/157018instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:23:46.232CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsula
title Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsula
spellingShingle Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsula
Moreira, María Eugenia
Notothenioidei
Relative intestine lengths
Trophic ecology
Potter Cove
South Shetland Islands
title_short Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsula
title_full Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsula
title_fullStr Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsula
title_full_unstemmed Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsula
title_sort Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsula
dc.creator.none.fl_str_mv Moreira, María Eugenia
Novillo Estofan, Julio Manuel
Eastman, Joseph
Barrera Oro, Esteban
author Moreira, María Eugenia
author_facet Moreira, María Eugenia
Novillo Estofan, Julio Manuel
Eastman, Joseph
Barrera Oro, Esteban
author_role author
author2 Novillo Estofan, Julio Manuel
Eastman, Joseph
Barrera Oro, Esteban
author2_role author
author
author
dc.subject.none.fl_str_mv Notothenioidei
Relative intestine lengths
Trophic ecology
Potter Cove
South Shetland Islands
topic Notothenioidei
Relative intestine lengths
Trophic ecology
Potter Cove
South Shetland Islands
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Although many notothenioid fishes are primarily carnivorous, some species consistently feed on macroalgae and are therefore omnivorous. Among fish the degree of herbivory is usually reflected in the morphology of the gastrointestinal system especially intestine length. We examined a large number of juvenile and adult specimens of nine sympatric notothenioid species collected sequentially over eight summer seasons at Potter Cove, South Shetland Islands. We provide relative intestine lengths [RIL= (IL/SL)*100], distinct proportions of algae and animal prey in the diets (W %), and numbers of pyloric caeca for all species. The sister species Notothenia coriiceps (NOC) and N. rossii (NOR) evidenced significantly different intestinal growth over ontogeny and ate distinctly different proportions of algae and animal prey. We establish a ranking of the degree of herbivory for the fish species in the local ecosystem, and this was found to be related to their distinct feeding types and strategies. There is a correspondence between intestine length/RILs and degree of herbivory in six of the nine species analyzed but no clear association between the number of pyloric ceca and degree of omnivory or carnivory. Compared to other teleosts, our results and those in the literature, indicate modest divergence in notothenioids that includes: a phylogenetic decrease in the number of pyloric ceca, from 6–7 in most nototheniids to 2–3 in channichthyids; and a 1.8-fold difference in average relative intestine lengths which are most frequently 50–70% of body length and never exceed body length. This is consistent with the unspecialized gastrointestinal morphology that reflects the dietary and ecological plasticity of many notothenioids, exemplified by the high degree of omnivory in species such as NOC and NOR.
Fil: Moreira, María Eugenia. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Cientifico Tecnolológico Mar del Plata. Instituto de Investigaciones en Biodiversidad y Biotecnología. Laboratorio de Biología Funcional y Biotecnología; Argentina
Fil: Novillo Estofan, Julio Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Fil: Eastman, Joseph. Ohio University; Estados Unidos
Fil: Barrera Oro, Esteban. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
XVIII Congreso Latinoamericano de Ciencias del Mar - COLACMAR 2019
Mar del Plata
Argentina
Asociación Latinoamericana de Investigadores en Ciencias del Mar
description Although many notothenioid fishes are primarily carnivorous, some species consistently feed on macroalgae and are therefore omnivorous. Among fish the degree of herbivory is usually reflected in the morphology of the gastrointestinal system especially intestine length. We examined a large number of juvenile and adult specimens of nine sympatric notothenioid species collected sequentially over eight summer seasons at Potter Cove, South Shetland Islands. We provide relative intestine lengths [RIL= (IL/SL)*100], distinct proportions of algae and animal prey in the diets (W %), and numbers of pyloric caeca for all species. The sister species Notothenia coriiceps (NOC) and N. rossii (NOR) evidenced significantly different intestinal growth over ontogeny and ate distinctly different proportions of algae and animal prey. We establish a ranking of the degree of herbivory for the fish species in the local ecosystem, and this was found to be related to their distinct feeding types and strategies. There is a correspondence between intestine length/RILs and degree of herbivory in six of the nine species analyzed but no clear association between the number of pyloric ceca and degree of omnivory or carnivory. Compared to other teleosts, our results and those in the literature, indicate modest divergence in notothenioids that includes: a phylogenetic decrease in the number of pyloric ceca, from 6–7 in most nototheniids to 2–3 in channichthyids; and a 1.8-fold difference in average relative intestine lengths which are most frequently 50–70% of body length and never exceed body length. This is consistent with the unspecialized gastrointestinal morphology that reflects the dietary and ecological plasticity of many notothenioids, exemplified by the high degree of omnivory in species such as NOC and NOR.
publishDate 2019
dc.date.none.fl_str_mv 2019
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info:eu-repo/semantics/conferenceObject
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http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/157018
Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsula; XVIII Congreso Latinoamericano de Ciencias del Mar - COLACMAR 2019; Mar del Plata; Argentina; 2019; 226-226
CONICET Digital
CONICET
url http://hdl.handle.net/11336/157018
identifier_str_mv Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsula; XVIII Congreso Latinoamericano de Ciencias del Mar - COLACMAR 2019; Mar del Plata; Argentina; 2019; 226-226
CONICET Digital
CONICET
dc.language.none.fl_str_mv spa
language spa
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://rid.unrn.edu.ar/bitstream/20.500.12049/3880/3/LIBRO-DE-RESUMENES-COLACMAR-2019.pdf
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dc.publisher.none.fl_str_mv Asociación Latinoamericana de Investigadores en Ciencias del Mar-
publisher.none.fl_str_mv Asociación Latinoamericana de Investigadores en Ciencias del Mar-
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