Trophodynamics of Southern Ocean pteropods on the southern Kerguelen Plateau
Abstract Pteropods are a group of small marine gastropods that are highly sensitive to multiple stressors associated with climate change. Their trophic ecology is not well studied, with most research having focused primarily on the effects of ocean acidification on their fragile, aragonite shells. S...
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ftdoajarticles:oai:doaj.org/article:c36f3093063241a8b106d75b38613d9c 2023-05-15T13:40:02+02:00 Trophodynamics of Southern Ocean pteropods on the southern Kerguelen Plateau Christine K. Weldrick Rowan Trebilco Diana M. Davies Kerrie M. Swadling 2019-07-01T00:00:00Z https://doi.org/10.1002/ece3.5380 https://doaj.org/article/c36f3093063241a8b106d75b38613d9c EN eng Wiley https://doi.org/10.1002/ece3.5380 https://doaj.org/toc/2045-7758 2045-7758 doi:10.1002/ece3.5380 https://doaj.org/article/c36f3093063241a8b106d75b38613d9c Ecology and Evolution, Vol 9, Iss 14, Pp 8119-8132 (2019) Clio pyramidata Clione limacina isotopic niche size‐based Spongiobranchaea australis trophic position Ecology QH540-549.5 article 2019 ftdoajarticles https://doi.org/10.1002/ece3.5380 2022-12-31T15:57:42Z Abstract Pteropods are a group of small marine gastropods that are highly sensitive to multiple stressors associated with climate change. Their trophic ecology is not well studied, with most research having focused primarily on the effects of ocean acidification on their fragile, aragonite shells. Stable isotopes analysis coupled with isotope‐based Bayesian niche metrics is useful for characterizing the trophic structure of biological assemblages. These approaches have not been implemented for pteropod assemblages. We used isotope‐based Bayesian niche metrics to investigate the trophic relationships of three co‐occurring pteropod species, with distinct feeding behaviors, sampled from the Southern Kerguelen Plateau area in the Indian Sector of the Southern Ocean—a biologically and economically important but poorly studied region. Two of these species were gymnosomes (shell‐less pteropods), which are traditionally regarded as specialist predators on other pteropods, and the third species was a thecosome (shelled pteropod), which are typically generalist omnivores. For each species, we aimed to understand (a) variability and overlap among isotopic niches; and (b) whether there was a relationship between body size and trophic position. Observed isotopic niche areas were broadest for gymnosomes, especially Clione limacina antarctica, whose observed isotopic niche area was wider than expected on both δ13C and δ15N value axes. We also found that trophic position significantly increased with increasing body length for Spongiobranchaea australis. We found no indication of a dietary shift toward increased trophic position with increasing body size for Clio pyramidata f. sulcata. Trophic positions ranged from 2.8 to 3.5, revealing an assemblage composed of both primary and secondary consumer behaviors. This study provides a comprehensive comparative analysis on trophodynamics in Southern Ocean pteropod species, and supports previous studies using gut content, fatty acid and stable isotope analyses. Combined, our results ... Article in Journal/Newspaper Antarc* Antarctica Clione limacina Limacina antarctica Ocean acidification Southern Ocean Directory of Open Access Journals: DOAJ Articles Southern Ocean Kerguelen Indian Ecology and Evolution 9 14 8119 8132 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Clio pyramidata Clione limacina isotopic niche size‐based Spongiobranchaea australis trophic position Ecology QH540-549.5 |
spellingShingle |
Clio pyramidata Clione limacina isotopic niche size‐based Spongiobranchaea australis trophic position Ecology QH540-549.5 Christine K. Weldrick Rowan Trebilco Diana M. Davies Kerrie M. Swadling Trophodynamics of Southern Ocean pteropods on the southern Kerguelen Plateau |
topic_facet |
Clio pyramidata Clione limacina isotopic niche size‐based Spongiobranchaea australis trophic position Ecology QH540-549.5 |
description |
Abstract Pteropods are a group of small marine gastropods that are highly sensitive to multiple stressors associated with climate change. Their trophic ecology is not well studied, with most research having focused primarily on the effects of ocean acidification on their fragile, aragonite shells. Stable isotopes analysis coupled with isotope‐based Bayesian niche metrics is useful for characterizing the trophic structure of biological assemblages. These approaches have not been implemented for pteropod assemblages. We used isotope‐based Bayesian niche metrics to investigate the trophic relationships of three co‐occurring pteropod species, with distinct feeding behaviors, sampled from the Southern Kerguelen Plateau area in the Indian Sector of the Southern Ocean—a biologically and economically important but poorly studied region. Two of these species were gymnosomes (shell‐less pteropods), which are traditionally regarded as specialist predators on other pteropods, and the third species was a thecosome (shelled pteropod), which are typically generalist omnivores. For each species, we aimed to understand (a) variability and overlap among isotopic niches; and (b) whether there was a relationship between body size and trophic position. Observed isotopic niche areas were broadest for gymnosomes, especially Clione limacina antarctica, whose observed isotopic niche area was wider than expected on both δ13C and δ15N value axes. We also found that trophic position significantly increased with increasing body length for Spongiobranchaea australis. We found no indication of a dietary shift toward increased trophic position with increasing body size for Clio pyramidata f. sulcata. Trophic positions ranged from 2.8 to 3.5, revealing an assemblage composed of both primary and secondary consumer behaviors. This study provides a comprehensive comparative analysis on trophodynamics in Southern Ocean pteropod species, and supports previous studies using gut content, fatty acid and stable isotope analyses. Combined, our results ... |
format |
Article in Journal/Newspaper |
author |
Christine K. Weldrick Rowan Trebilco Diana M. Davies Kerrie M. Swadling |
author_facet |
Christine K. Weldrick Rowan Trebilco Diana M. Davies Kerrie M. Swadling |
author_sort |
Christine K. Weldrick |
title |
Trophodynamics of Southern Ocean pteropods on the southern Kerguelen Plateau |
title_short |
Trophodynamics of Southern Ocean pteropods on the southern Kerguelen Plateau |
title_full |
Trophodynamics of Southern Ocean pteropods on the southern Kerguelen Plateau |
title_fullStr |
Trophodynamics of Southern Ocean pteropods on the southern Kerguelen Plateau |
title_full_unstemmed |
Trophodynamics of Southern Ocean pteropods on the southern Kerguelen Plateau |
title_sort |
trophodynamics of southern ocean pteropods on the southern kerguelen plateau |
publisher |
Wiley |
publishDate |
2019 |
url |
https://doi.org/10.1002/ece3.5380 https://doaj.org/article/c36f3093063241a8b106d75b38613d9c |
geographic |
Southern Ocean Kerguelen Indian |
geographic_facet |
Southern Ocean Kerguelen Indian |
genre |
Antarc* Antarctica Clione limacina Limacina antarctica Ocean acidification Southern Ocean |
genre_facet |
Antarc* Antarctica Clione limacina Limacina antarctica Ocean acidification Southern Ocean |
op_source |
Ecology and Evolution, Vol 9, Iss 14, Pp 8119-8132 (2019) |
op_relation |
https://doi.org/10.1002/ece3.5380 https://doaj.org/toc/2045-7758 2045-7758 doi:10.1002/ece3.5380 https://doaj.org/article/c36f3093063241a8b106d75b38613d9c |
op_doi |
https://doi.org/10.1002/ece3.5380 |
container_title |
Ecology and Evolution |
container_volume |
9 |
container_issue |
14 |
container_start_page |
8119 |
op_container_end_page |
8132 |
_version_ |
1766127204659363840 |