Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsula
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...
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Asociación Latinoamericana de Investigadores en Ciencias del Mar-
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ftconicet:oai:ri.conicet.gov.ar:11336/157018 2023-10-09T21:47:14+02:00 Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsula Moreira, María Eugenia Novillo Estofan, Julio Manuel Eastman, Joseph Barrera Oro, Esteban Internacional application/pdf http://hdl.handle.net/11336/157018 spa spa Asociación Latinoamericana de Investigadores en Ciencias del Mar- info:eu-repo/semantics/altIdentifier/url/https://rid.unrn.edu.ar/bitstream/20.500.12049/3880/3/LIBRO-DE-RESUMENES-COLACMAR-2019.pdf 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 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ Notothenioidei Relative intestine lengths Trophic ecology Potter Cove South Shetland Islands https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/conferenceObject info:ar-repo/semantics/documento de conferencia Congreso Book ftconicet 2023-09-24T19:56:48Z 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. ... Book Antarc* Antarctic Antarctic Peninsula Dirección Nacional del Antártico Instituto Antártico Argentino South Shetland Islands CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic Antarctic Peninsula Argentina Argentino Potter Cove South Shetland Islands |
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Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
Spanish |
topic |
Notothenioidei Relative intestine lengths Trophic ecology Potter Cove South Shetland Islands https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
spellingShingle |
Notothenioidei Relative intestine lengths Trophic ecology Potter Cove South Shetland Islands https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 Moreira, María Eugenia Novillo Estofan, Julio Manuel Eastman, Joseph Barrera Oro, Esteban Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsula |
topic_facet |
Notothenioidei Relative intestine lengths Trophic ecology Potter Cove South Shetland Islands https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
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. 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. ... |
format |
Book |
author |
Moreira, María Eugenia Novillo Estofan, Julio Manuel Eastman, Joseph Barrera Oro, Esteban |
author_facet |
Moreira, María Eugenia Novillo Estofan, Julio Manuel Eastman, Joseph Barrera Oro, Esteban |
author_sort |
Moreira, María Eugenia |
title |
Degree of herbivory and intestinal morphology in nine notothenioid fishes from the western antarctic peninsula |
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 |
publisher |
Asociación Latinoamericana de Investigadores en Ciencias del Mar- |
url |
http://hdl.handle.net/11336/157018 |
op_coverage |
Internacional |
geographic |
Antarctic Antarctic Peninsula Argentina Argentino Potter Cove South Shetland Islands |
geographic_facet |
Antarctic Antarctic Peninsula Argentina Argentino Potter Cove South Shetland Islands |
genre |
Antarc* Antarctic Antarctic Peninsula Dirección Nacional del Antártico Instituto Antártico Argentino South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Dirección Nacional del Antártico Instituto Antártico Argentino South Shetland Islands |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://rid.unrn.edu.ar/bitstream/20.500.12049/3880/3/LIBRO-DE-RESUMENES-COLACMAR-2019.pdf 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 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
_version_ |
1779310193125883904 |