Life history traits of a poorly known pelagic fish, Aethotaxis mitopteryx (Perciformes, Notothenioidei) from the Weddell Sea
Amongst the nototheniid subfamily Pleuragramminae, Aethotaxis mitopteryx is an infrequently collected high Antarctic species with an array of morphological and physiological adaptations supporting an evolutionarily derived benthopelagic lifestyle. The present study deals with some poorly known life...
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ftunivpadovairis:oai:www.research.unipd.it:11577/3268204 2024-04-21T07:51:49+00:00 Life history traits of a poorly known pelagic fish, Aethotaxis mitopteryx (Perciformes, Notothenioidei) from the Weddell Sea Mario La Mesa Fortunata Donato Emilio Riginella Carlotta Mazzoldi La Mesa, Mario Donato, Fortunata Riginella, Emilio Mazzoldi, Carlotta 2018 STAMPA http://hdl.handle.net/11577/3268204 https://doi.org/10.1007/s00300-018-2318-1 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000447600600011 volume:41 firstpage:1777 lastpage:1788 numberofpages:12 journal:POLAR BIOLOGY http://hdl.handle.net/11577/3268204 doi:10.1007/s00300-018-2318-1 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85044478225 Life strategies · Age and growth · Reproduction · Nototheniid · Weddell sea info:eu-repo/semantics/article 2018 ftunivpadovairis https://doi.org/10.1007/s00300-018-2318-1 2024-03-28T02:00:51Z Amongst the nototheniid subfamily Pleuragramminae, Aethotaxis mitopteryx is an infrequently collected high Antarctic species with an array of morphological and physiological adaptations supporting an evolutionarily derived benthopelagic lifestyle. The present study deals with some poorly known life history traits of this species, counting on 79 specimens collected in the Weddell Sea during 2014 and 2015 austral summer. Annulation pattern in sagittal otoliths were used to assess population age structure and growth rate, while macroscopic and histological analyses of gonads were performed to estimate reproductive status and features of gametogenesis. The sex ratio of the sampled population was close to parity, with females significantly larger than males. Based on the von Bertalanffy growth model, females attained a larger maximum size (40 vs. 27 cm) at a lower rate (0.05 vs. 0.12 years−1) than males. Individual longevity was remarkable in both sexes, females and males attaining 62 and 32 years of age, respectively. Females showed group synchronous oocyte development and presumed high reproductive effort, as indicated by the large size of residual hydrated oocytes in regressing individuals (4.6–4.8 mm). Body sizes at sexual maturity were 33 and 19 cm in females and males, corresponding to 32 and 11 years of age, respectively. All specimens were caught far from the reproductive season. From an evolutionary perspective, it appears that the process of pelagization similarly influenced the life strategies of the species within the clade Pleuragramminae, which shared high reproductive effort linked to early sexual maturity, slow somatic growth and long life span. Article in Journal/Newspaper Antarc* Antarctic Weddell Sea Padua Research Archive (IRIS - Università degli Studi di Padova) Polar Biology 41 9 1777 1788 |
institution |
Open Polar |
collection |
Padua Research Archive (IRIS - Università degli Studi di Padova) |
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ftunivpadovairis |
language |
English |
topic |
Life strategies · Age and growth · Reproduction · Nototheniid · Weddell sea |
spellingShingle |
Life strategies · Age and growth · Reproduction · Nototheniid · Weddell sea Mario La Mesa Fortunata Donato Emilio Riginella Carlotta Mazzoldi Life history traits of a poorly known pelagic fish, Aethotaxis mitopteryx (Perciformes, Notothenioidei) from the Weddell Sea |
topic_facet |
Life strategies · Age and growth · Reproduction · Nototheniid · Weddell sea |
description |
Amongst the nototheniid subfamily Pleuragramminae, Aethotaxis mitopteryx is an infrequently collected high Antarctic species with an array of morphological and physiological adaptations supporting an evolutionarily derived benthopelagic lifestyle. The present study deals with some poorly known life history traits of this species, counting on 79 specimens collected in the Weddell Sea during 2014 and 2015 austral summer. Annulation pattern in sagittal otoliths were used to assess population age structure and growth rate, while macroscopic and histological analyses of gonads were performed to estimate reproductive status and features of gametogenesis. The sex ratio of the sampled population was close to parity, with females significantly larger than males. Based on the von Bertalanffy growth model, females attained a larger maximum size (40 vs. 27 cm) at a lower rate (0.05 vs. 0.12 years−1) than males. Individual longevity was remarkable in both sexes, females and males attaining 62 and 32 years of age, respectively. Females showed group synchronous oocyte development and presumed high reproductive effort, as indicated by the large size of residual hydrated oocytes in regressing individuals (4.6–4.8 mm). Body sizes at sexual maturity were 33 and 19 cm in females and males, corresponding to 32 and 11 years of age, respectively. All specimens were caught far from the reproductive season. From an evolutionary perspective, it appears that the process of pelagization similarly influenced the life strategies of the species within the clade Pleuragramminae, which shared high reproductive effort linked to early sexual maturity, slow somatic growth and long life span. |
author2 |
La Mesa, Mario Donato, Fortunata Riginella, Emilio Mazzoldi, Carlotta |
format |
Article in Journal/Newspaper |
author |
Mario La Mesa Fortunata Donato Emilio Riginella Carlotta Mazzoldi |
author_facet |
Mario La Mesa Fortunata Donato Emilio Riginella Carlotta Mazzoldi |
author_sort |
Mario La Mesa |
title |
Life history traits of a poorly known pelagic fish, Aethotaxis mitopteryx (Perciformes, Notothenioidei) from the Weddell Sea |
title_short |
Life history traits of a poorly known pelagic fish, Aethotaxis mitopteryx (Perciformes, Notothenioidei) from the Weddell Sea |
title_full |
Life history traits of a poorly known pelagic fish, Aethotaxis mitopteryx (Perciformes, Notothenioidei) from the Weddell Sea |
title_fullStr |
Life history traits of a poorly known pelagic fish, Aethotaxis mitopteryx (Perciformes, Notothenioidei) from the Weddell Sea |
title_full_unstemmed |
Life history traits of a poorly known pelagic fish, Aethotaxis mitopteryx (Perciformes, Notothenioidei) from the Weddell Sea |
title_sort |
life history traits of a poorly known pelagic fish, aethotaxis mitopteryx (perciformes, notothenioidei) from the weddell sea |
publishDate |
2018 |
url |
http://hdl.handle.net/11577/3268204 https://doi.org/10.1007/s00300-018-2318-1 |
genre |
Antarc* Antarctic Weddell Sea |
genre_facet |
Antarc* Antarctic Weddell Sea |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000447600600011 volume:41 firstpage:1777 lastpage:1788 numberofpages:12 journal:POLAR BIOLOGY http://hdl.handle.net/11577/3268204 doi:10.1007/s00300-018-2318-1 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85044478225 |
op_doi |
https://doi.org/10.1007/s00300-018-2318-1 |
container_title |
Polar Biology |
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41 |
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9 |
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1777 |
op_container_end_page |
1788 |
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1796935116621086720 |