Ontogenetic changes in the feeding strategy of Lepidonotothen nudifrons (Pisces, Nototheniidae) off the South Shetland Islands and the Antarctic Peninsula
The diet and feeding strategy of Lepidonotothen nudifrons off the South Shetland Islands and the Antarctic Peninsula, as well as their variation in relation to ontogenetic stage (juvenile– adult) and sampling area, were determined by stomach contents analysis. Additionally, the trophic level of this...
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ftjpolarres:oai:journals.openacademia.net:article/2652 2023-05-15T14:01:21+02:00 Ontogenetic changes in the feeding strategy of Lepidonotothen nudifrons (Pisces, Nototheniidae) off the South Shetland Islands and the Antarctic Peninsula Blasina, Gabriela Cazorla, Andrea Lopez Antoni, Mariana Deli Bruno, Daniel Delpiani, Matías Díaz de Astarloa, Juan Martín 2017-06-19 application/pdf application/xml https://polarresearch.net/index.php/polar/article/view/2652 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2652/6054 https://polarresearch.net/index.php/polar/article/view/2652/6055 https://polarresearch.net/index.php/polar/article/view/2652 Polar Research; Vol 36 (2017) 1751-8369 Antarctic fish diet zonerelated changes dominant prey feeding strategy trophic level food web info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftjpolarres 2021-11-11T19:13:09Z The diet and feeding strategy of Lepidonotothen nudifrons off the South Shetland Islands and the Antarctic Peninsula, as well as their variation in relation to ontogenetic stage (juvenile– adult) and sampling area, were determined by stomach contents analysis. Additionally, the trophic level of this species was estimated to determine its position within the Antarctic food web. Out of 247 specimens with prey in their stomachs, 144 were caught near the South Shetland Islands and 103 off the Antarctic Peninsula. Ontogenetic changes in the trophic ecology of L. nudifrons were observed in both areas and were mainly related to a decrease of copepods and an increase of euphausiids in the diet. The diet of juveniles from the South Shetland Islands was characterized by the dominance of calanoid copepods, followed by isopods and amphipods, whereas diet off the Antarctic Peninsula was dominated by amphipods and cyclopoid copepods. The diet in adults was dominated by amphipods and euphausiids in both areas. The specialization of individual predators on different prey types was observed when considering the whole population of L. nudifrons, but when ontogenetic stages were considered separately it showed a more mixed feeding strategy, with different dominant prey for each class. Although the trophic level increased with fish size, L. nudifrons can be classified as secondary consumer throughout its lifespan. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Polar Research South Shetland Islands Copepods Polar Research (E-Journal) Antarctic The Antarctic Antarctic Peninsula South Shetland Islands |
institution |
Open Polar |
collection |
Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
topic |
Antarctic fish diet zonerelated changes dominant prey feeding strategy trophic level food web |
spellingShingle |
Antarctic fish diet zonerelated changes dominant prey feeding strategy trophic level food web Blasina, Gabriela Cazorla, Andrea Lopez Antoni, Mariana Deli Bruno, Daniel Delpiani, Matías Díaz de Astarloa, Juan Martín Ontogenetic changes in the feeding strategy of Lepidonotothen nudifrons (Pisces, Nototheniidae) off the South Shetland Islands and the Antarctic Peninsula |
topic_facet |
Antarctic fish diet zonerelated changes dominant prey feeding strategy trophic level food web |
description |
The diet and feeding strategy of Lepidonotothen nudifrons off the South Shetland Islands and the Antarctic Peninsula, as well as their variation in relation to ontogenetic stage (juvenile– adult) and sampling area, were determined by stomach contents analysis. Additionally, the trophic level of this species was estimated to determine its position within the Antarctic food web. Out of 247 specimens with prey in their stomachs, 144 were caught near the South Shetland Islands and 103 off the Antarctic Peninsula. Ontogenetic changes in the trophic ecology of L. nudifrons were observed in both areas and were mainly related to a decrease of copepods and an increase of euphausiids in the diet. The diet of juveniles from the South Shetland Islands was characterized by the dominance of calanoid copepods, followed by isopods and amphipods, whereas diet off the Antarctic Peninsula was dominated by amphipods and cyclopoid copepods. The diet in adults was dominated by amphipods and euphausiids in both areas. The specialization of individual predators on different prey types was observed when considering the whole population of L. nudifrons, but when ontogenetic stages were considered separately it showed a more mixed feeding strategy, with different dominant prey for each class. Although the trophic level increased with fish size, L. nudifrons can be classified as secondary consumer throughout its lifespan. |
format |
Article in Journal/Newspaper |
author |
Blasina, Gabriela Cazorla, Andrea Lopez Antoni, Mariana Deli Bruno, Daniel Delpiani, Matías Díaz de Astarloa, Juan Martín |
author_facet |
Blasina, Gabriela Cazorla, Andrea Lopez Antoni, Mariana Deli Bruno, Daniel Delpiani, Matías Díaz de Astarloa, Juan Martín |
author_sort |
Blasina, Gabriela |
title |
Ontogenetic changes in the feeding strategy of Lepidonotothen nudifrons (Pisces, Nototheniidae) off the South Shetland Islands and the Antarctic Peninsula |
title_short |
Ontogenetic changes in the feeding strategy of Lepidonotothen nudifrons (Pisces, Nototheniidae) off the South Shetland Islands and the Antarctic Peninsula |
title_full |
Ontogenetic changes in the feeding strategy of Lepidonotothen nudifrons (Pisces, Nototheniidae) off the South Shetland Islands and the Antarctic Peninsula |
title_fullStr |
Ontogenetic changes in the feeding strategy of Lepidonotothen nudifrons (Pisces, Nototheniidae) off the South Shetland Islands and the Antarctic Peninsula |
title_full_unstemmed |
Ontogenetic changes in the feeding strategy of Lepidonotothen nudifrons (Pisces, Nototheniidae) off the South Shetland Islands and the Antarctic Peninsula |
title_sort |
ontogenetic changes in the feeding strategy of lepidonotothen nudifrons (pisces, nototheniidae) off the south shetland islands and the antarctic peninsula |
publisher |
Norwegian Polar Institute |
publishDate |
2017 |
url |
https://polarresearch.net/index.php/polar/article/view/2652 |
geographic |
Antarctic The Antarctic Antarctic Peninsula South Shetland Islands |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula South Shetland Islands |
genre |
Antarc* Antarctic Antarctic Peninsula Polar Research South Shetland Islands Copepods |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Polar Research South Shetland Islands Copepods |
op_source |
Polar Research; Vol 36 (2017) 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2652/6054 https://polarresearch.net/index.php/polar/article/view/2652/6055 https://polarresearch.net/index.php/polar/article/view/2652 |
_version_ |
1766271087226650624 |