Buoyancy studies of three morphs of the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands
Phenotypic plasticity, a widespread phenomenon in boreal freshwater fishes, is less apparent in the marine realm and the organism-environment interactions producing this variation are undetermined. A sample of 40 specimens of Trematomus newnesi, an inshore Antarctic fish from King George/25 de Mayo...
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ftconicet:oai:ri.conicet.gov.ar:11336/53528 2023-10-09T21:47:14+02:00 Buoyancy studies of three morphs of the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands Eastman, Joseph T. Barrera Oro, Esteban application/pdf http://hdl.handle.net/11336/53528 eng eng Springer info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/s00300-009-0760-9 info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-009-0760-9 http://hdl.handle.net/11336/53528 Eastman, Joseph T.; Barrera Oro, Esteban; Buoyancy studies of three morphs of the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands; Springer; Polar Biology; 33; 6; 6-2010; 823-831 0722-4060 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ Ecology Notothenioidei Phenotypic Plasticity Skeleton Trophic Polymorphism https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1007/s00300-009-0760-9 2023-09-24T19:55:22Z Phenotypic plasticity, a widespread phenomenon in boreal freshwater fishes, is less apparent in the marine realm and the organism-environment interactions producing this variation are undetermined. A sample of 40 specimens of Trematomus newnesi, an inshore Antarctic fish from King George/25 de Mayo Island in the South Shetlands, was composed of 52.5% typical morphs, 27.5% large-mouth morphs and 20% intermediate morphs. Measurements of percentage buoyancy on the morphs of this sample were 3.73, 3.84 and 3.83%, respectively with no significant differences among means. Both mean dry skeletal weight as a percentage of body weight and mean oral jaw weight as a percentage of dry skeletal weight were significantly greater in large-mouth morphs compared to typical morphs. Diversification in head and jaw morphology is not accompanied by diversification in ecology as represented by buoyancy and, in spite of external appearances, measurements of buoyancy offer no support for the hypothesis that the large-mouth morph is more benthic than the typical semipelagic morph. Although a trophic basis for this polymorphism is possible, it has not yet been documented. Our discussion centers on the status of key open questions regarding morphism and highlights areas requiring more research. Fil: Eastman, Joseph T. 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; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Argentina Article in Journal/Newspaper Antarc* Antarctic Dirección Nacional del Antártico Instituto Antártico Argentino Polar Biology South Shetland Islands CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic The Antarctic South Shetland Islands Argentino Argentina 25 de Mayo ENVELOPE(-58.000,-58.000,-62.083,-62.083) Eastman ENVELOPE(-62.985,-62.985,-65.166,-65.166) Polar Biology 33 6 823 831 |
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Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
Ecology Notothenioidei Phenotypic Plasticity Skeleton Trophic Polymorphism https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
spellingShingle |
Ecology Notothenioidei Phenotypic Plasticity Skeleton Trophic Polymorphism https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 Eastman, Joseph T. Barrera Oro, Esteban Buoyancy studies of three morphs of the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands |
topic_facet |
Ecology Notothenioidei Phenotypic Plasticity Skeleton Trophic Polymorphism https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
description |
Phenotypic plasticity, a widespread phenomenon in boreal freshwater fishes, is less apparent in the marine realm and the organism-environment interactions producing this variation are undetermined. A sample of 40 specimens of Trematomus newnesi, an inshore Antarctic fish from King George/25 de Mayo Island in the South Shetlands, was composed of 52.5% typical morphs, 27.5% large-mouth morphs and 20% intermediate morphs. Measurements of percentage buoyancy on the morphs of this sample were 3.73, 3.84 and 3.83%, respectively with no significant differences among means. Both mean dry skeletal weight as a percentage of body weight and mean oral jaw weight as a percentage of dry skeletal weight were significantly greater in large-mouth morphs compared to typical morphs. Diversification in head and jaw morphology is not accompanied by diversification in ecology as represented by buoyancy and, in spite of external appearances, measurements of buoyancy offer no support for the hypothesis that the large-mouth morph is more benthic than the typical semipelagic morph. Although a trophic basis for this polymorphism is possible, it has not yet been documented. Our discussion centers on the status of key open questions regarding morphism and highlights areas requiring more research. Fil: Eastman, Joseph T. 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; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Argentina |
format |
Article in Journal/Newspaper |
author |
Eastman, Joseph T. Barrera Oro, Esteban |
author_facet |
Eastman, Joseph T. Barrera Oro, Esteban |
author_sort |
Eastman, Joseph T. |
title |
Buoyancy studies of three morphs of the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands |
title_short |
Buoyancy studies of three morphs of the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands |
title_full |
Buoyancy studies of three morphs of the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands |
title_fullStr |
Buoyancy studies of three morphs of the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands |
title_full_unstemmed |
Buoyancy studies of three morphs of the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands |
title_sort |
buoyancy studies of three morphs of the antarctic fish trematomus newnesi (nototheniidae) from the south shetland islands |
publisher |
Springer |
url |
http://hdl.handle.net/11336/53528 |
long_lat |
ENVELOPE(-58.000,-58.000,-62.083,-62.083) ENVELOPE(-62.985,-62.985,-65.166,-65.166) |
geographic |
Antarctic The Antarctic South Shetland Islands Argentino Argentina 25 de Mayo Eastman |
geographic_facet |
Antarctic The Antarctic South Shetland Islands Argentino Argentina 25 de Mayo Eastman |
genre |
Antarc* Antarctic Dirección Nacional del Antártico Instituto Antártico Argentino Polar Biology South Shetland Islands |
genre_facet |
Antarc* Antarctic Dirección Nacional del Antártico Instituto Antártico Argentino Polar Biology South Shetland Islands |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/s00300-009-0760-9 info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-009-0760-9 http://hdl.handle.net/11336/53528 Eastman, Joseph T.; Barrera Oro, Esteban; Buoyancy studies of three morphs of the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands; Springer; Polar Biology; 33; 6; 6-2010; 823-831 0722-4060 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1007/s00300-009-0760-9 |
container_title |
Polar Biology |
container_volume |
33 |
container_issue |
6 |
container_start_page |
823 |
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831 |
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1779310169667141632 |