Otolith morphology and feeding ecology of an Antarctic nototheniid, Lepidonotothen larseni
Abstract This study is based on the analysis of the stomach content and the morphology and morphometry of the three pairs of otoliths (sagitta, asteriscus and lapillus) of Lepidonotothen larseni (Lönnberg) collected at the South Shetland Islands and Antarctic Peninsula during summer, in order to fin...
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crcambridgeupr:10.1017/s0954102013000394 2024-06-23T07:47:14+00:00 Otolith morphology and feeding ecology of an Antarctic nototheniid, Lepidonotothen larseni Curcio, Nadia Tombari, Andrea Capitanio, Fabiana 2013 http://dx.doi.org/10.1017/s0954102013000394 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102013000394 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 26, issue 2, page 124-132 ISSN 0954-1020 1365-2079 journal-article 2013 crcambridgeupr https://doi.org/10.1017/s0954102013000394 2024-06-05T04:04:48Z Abstract This study is based on the analysis of the stomach content and the morphology and morphometry of the three pairs of otoliths (sagitta, asteriscus and lapillus) of Lepidonotothen larseni (Lönnberg) collected at the South Shetland Islands and Antarctic Peninsula during summer, in order to find possible relationships between ontogenetic change of sagittal otolith shape and feeding ecology. Length-weight relationship resulted in a positive allometric growth, with juveniles and adults in good nutritional condition (Le Cren condition index > 1), and with a decreasing trend from noon to late evening of the stomach repletion index. The stomach content consisted of several prey, with copepods and amphipods more frequent and abundant in juveniles, whereas euphausiids were in adults. The morphometric analysis of otoliths enabled us to relate different measurements with fish size, and those contributing mostly to separate juveniles from adults were the otolith and rostrum length and their percentage (R index). Juveniles proportionally showed a shorter and wider sagitta than adults reflected in a major E index because of a rounded shape and a minor R index because of a less developed rostrum. This pattern can be tentatively linked to the different habitat of juveniles and adults of this species, being respectively pelagic and epibenthic, as also evidenced by the ontogenetic change of feeding habits. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctic Science South Shetland Islands Copepods Cambridge University Press Antarctic Antarctic Peninsula South Shetland Islands Antarctic Science 26 2 124 132 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract This study is based on the analysis of the stomach content and the morphology and morphometry of the three pairs of otoliths (sagitta, asteriscus and lapillus) of Lepidonotothen larseni (Lönnberg) collected at the South Shetland Islands and Antarctic Peninsula during summer, in order to find possible relationships between ontogenetic change of sagittal otolith shape and feeding ecology. Length-weight relationship resulted in a positive allometric growth, with juveniles and adults in good nutritional condition (Le Cren condition index > 1), and with a decreasing trend from noon to late evening of the stomach repletion index. The stomach content consisted of several prey, with copepods and amphipods more frequent and abundant in juveniles, whereas euphausiids were in adults. The morphometric analysis of otoliths enabled us to relate different measurements with fish size, and those contributing mostly to separate juveniles from adults were the otolith and rostrum length and their percentage (R index). Juveniles proportionally showed a shorter and wider sagitta than adults reflected in a major E index because of a rounded shape and a minor R index because of a less developed rostrum. This pattern can be tentatively linked to the different habitat of juveniles and adults of this species, being respectively pelagic and epibenthic, as also evidenced by the ontogenetic change of feeding habits. |
format |
Article in Journal/Newspaper |
author |
Curcio, Nadia Tombari, Andrea Capitanio, Fabiana |
spellingShingle |
Curcio, Nadia Tombari, Andrea Capitanio, Fabiana Otolith morphology and feeding ecology of an Antarctic nototheniid, Lepidonotothen larseni |
author_facet |
Curcio, Nadia Tombari, Andrea Capitanio, Fabiana |
author_sort |
Curcio, Nadia |
title |
Otolith morphology and feeding ecology of an Antarctic nototheniid, Lepidonotothen larseni |
title_short |
Otolith morphology and feeding ecology of an Antarctic nototheniid, Lepidonotothen larseni |
title_full |
Otolith morphology and feeding ecology of an Antarctic nototheniid, Lepidonotothen larseni |
title_fullStr |
Otolith morphology and feeding ecology of an Antarctic nototheniid, Lepidonotothen larseni |
title_full_unstemmed |
Otolith morphology and feeding ecology of an Antarctic nototheniid, Lepidonotothen larseni |
title_sort |
otolith morphology and feeding ecology of an antarctic nototheniid, lepidonotothen larseni |
publisher |
Cambridge University Press (CUP) |
publishDate |
2013 |
url |
http://dx.doi.org/10.1017/s0954102013000394 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102013000394 |
geographic |
Antarctic Antarctic Peninsula South Shetland Islands |
geographic_facet |
Antarctic Antarctic Peninsula South Shetland Islands |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic Science South Shetland Islands Copepods |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic Science South Shetland Islands Copepods |
op_source |
Antarctic Science volume 26, issue 2, page 124-132 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102013000394 |
container_title |
Antarctic Science |
container_volume |
26 |
container_issue |
2 |
container_start_page |
124 |
op_container_end_page |
132 |
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1802651323847409664 |