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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Norwegian Polar Institute
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ftdoajarticles:oai:doaj.org/article:378c688824d6443b9b5c69c2fc3a7eb4 2023-05-15T13:58:42+02:00 Ontogenetic changes in the feeding strategy of Lepidonotothen nudifrons (Pisces, Nototheniidae) off the South Shetland Islands and the Antarctic Peninsula Gabriela Blasina Andrea Lopez Cazorla Mariana Deli Antoni Daniel Bruno Matías Delpiani Juan Martín Díaz de Astarloa 2017-01-01T00:00:00Z https://doi.org/10.1080/17518369.2017.1331558 https://doaj.org/article/378c688824d6443b9b5c69c2fc3a7eb4 EN eng Norwegian Polar Institute http://dx.doi.org/10.1080/17518369.2017.1331558 https://doaj.org/toc/1751-8369 1751-8369 doi:10.1080/17518369.2017.1331558 https://doaj.org/article/378c688824d6443b9b5c69c2fc3a7eb4 Polar Research, Vol 36, Iss 1 (2017) Antarctic fish diet zone-related changes dominant prey feeding strategy trophic level food web Environmental sciences GE1-350 Oceanography GC1-1581 article 2017 ftdoajarticles https://doi.org/10.1080/17518369.2017.1331558 2022-12-31T13:50:57Z 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 Directory of Open Access Journals: DOAJ Articles Antarctic Antarctic Peninsula South Shetland Islands The Antarctic Polar Research 36 1 1331558 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctic fish diet zone-related changes dominant prey feeding strategy trophic level food web Environmental sciences GE1-350 Oceanography GC1-1581 |
spellingShingle |
Antarctic fish diet zone-related changes dominant prey feeding strategy trophic level food web Environmental sciences GE1-350 Oceanography GC1-1581 Gabriela Blasina Andrea Lopez Cazorla Mariana Deli Antoni Daniel Bruno Matías Delpiani Juan Martín Díaz de Astarloa 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 zone-related changes dominant prey feeding strategy trophic level food web Environmental sciences GE1-350 Oceanography GC1-1581 |
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 |
Gabriela Blasina Andrea Lopez Cazorla Mariana Deli Antoni Daniel Bruno Matías Delpiani Juan Martín Díaz de Astarloa |
author_facet |
Gabriela Blasina Andrea Lopez Cazorla Mariana Deli Antoni Daniel Bruno Matías Delpiani Juan Martín Díaz de Astarloa |
author_sort |
Gabriela Blasina |
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://doi.org/10.1080/17518369.2017.1331558 https://doaj.org/article/378c688824d6443b9b5c69c2fc3a7eb4 |
geographic |
Antarctic Antarctic Peninsula South Shetland Islands The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula South Shetland Islands The Antarctic |
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, Iss 1 (2017) |
op_relation |
http://dx.doi.org/10.1080/17518369.2017.1331558 https://doaj.org/toc/1751-8369 1751-8369 doi:10.1080/17518369.2017.1331558 https://doaj.org/article/378c688824d6443b9b5c69c2fc3a7eb4 |
op_doi |
https://doi.org/10.1080/17518369.2017.1331558 |
container_title |
Polar Research |
container_volume |
36 |
container_issue |
1 |
container_start_page |
1331558 |
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1766267055099609088 |