Early life history connectivity of Antarctic silverfish ( Pleuragramma antarctica ) in the Ross Sea
AbstractA recent population hypothesis for Antarctic silverfish (Pleuragramma antarctica), a critical forage species, argued that interactions between life history and circulation associated with glacial trough systems drive circumpolar distributions over the continental shelf. In the Ross Sea, aggr...
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Online Access: | https://www.openaccessrepository.it/record/103749 https://doi.org/10.1111/fog.12251 |
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ftopenaccessrep:oai:zenodo.org:103749 2023-10-25T01:28:46+02:00 Early life history connectivity of Antarctic silverfish ( Pleuragramma antarctica ) in the Ross Sea Julian R. Ashford Robert B. Dunbar Lorenzo Zane Jilda Alicia Caccavo Cassandra M. Brooks Kimberly T. Goetz Mario La Mesa 2018-01-25 https://www.openaccessrepository.it/record/103749 https://doi.org/10.1111/fog.12251 eng eng url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/103749 doi:10.1111/fog.12251 info:eu-repo/semantics/openAccess Division of Polar Programs Directorate for Geosciences National Science Foundation NSF Knowmad Institut NEANIAS Atmospheric Research Community Aquatic Science Oceanography info:eu-repo/semantics/article publication-article 2018 ftopenaccessrep https://doi.org/10.1111/fog.12251 2023-09-26T22:22:00Z AbstractA recent population hypothesis for Antarctic silverfish (Pleuragramma antarctica), a critical forage species, argued that interactions between life history and circulation associated with glacial trough systems drive circumpolar distributions over the continental shelf. In the Ross Sea, aggregations of eggs and larvae occur under fast ice in Terra Nova Bay, and the hypothesis predicted that dispersing larvae encounter outflow along the western side of Drygalski Trough. The outflow advects larvae towards the shelf‐break, and mixing with trough inflow facilitates return toward the inner shelf. To examine the hypothesis, we compared samples of P. antarctica collected near Coulman Island in the outflow, along Crary Bank in the inflow, and a third set taken over the rest of the Ross Sea. We ruled out misidentification using an innovative genetic validation. Silverfish larvae comprised 99.5% of the catch, and the highest population densities were found in Drygalski Trough. The results provided no evidence to reject the population hypothesis. Abundance indices, back‐calculated hatching dates, length distributions and growth were congruent with a unified early life history in the western Ross Sea, constrained by cryopelagic early stages in Terra Nova Bay. By contrast, a sample in the Bay of Whales revealed much smaller larvae, suggesting either a geographically separate population in the eastern Ross Sea, or westward connectivity with larvae spawned nearby by fish sourced from troughs upstream in the Amundsen Sea. These results illustrate how hypotheses that integrate population structure with life history can provide precise spatial predictions for subsequent testing. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctic silverfish Antarctica Coulman Island Ross Sea Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository Amundsen Sea Antarctic Bay of Whales ENVELOPE(-170.000,-170.000,-77.833,-77.833) Coulman Island ENVELOPE(169.750,169.750,-73.467,-73.467) Crary Bank ENVELOPE(169.000,169.000,-75.000,-75.000) Drygalski ENVELOPE(-61.000,-61.000,-64.717,-64.717) Ross Sea Terra Nova Bay Fisheries Oceanography 27 3 274 287 |
institution |
Open Polar |
collection |
Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository |
op_collection_id |
ftopenaccessrep |
language |
English |
topic |
Division of Polar Programs Directorate for Geosciences National Science Foundation NSF Knowmad Institut NEANIAS Atmospheric Research Community Aquatic Science Oceanography |
spellingShingle |
Division of Polar Programs Directorate for Geosciences National Science Foundation NSF Knowmad Institut NEANIAS Atmospheric Research Community Aquatic Science Oceanography Julian R. Ashford Robert B. Dunbar Lorenzo Zane Jilda Alicia Caccavo Cassandra M. Brooks Kimberly T. Goetz Mario La Mesa Early life history connectivity of Antarctic silverfish ( Pleuragramma antarctica ) in the Ross Sea |
topic_facet |
Division of Polar Programs Directorate for Geosciences National Science Foundation NSF Knowmad Institut NEANIAS Atmospheric Research Community Aquatic Science Oceanography |
description |
AbstractA recent population hypothesis for Antarctic silverfish (Pleuragramma antarctica), a critical forage species, argued that interactions between life history and circulation associated with glacial trough systems drive circumpolar distributions over the continental shelf. In the Ross Sea, aggregations of eggs and larvae occur under fast ice in Terra Nova Bay, and the hypothesis predicted that dispersing larvae encounter outflow along the western side of Drygalski Trough. The outflow advects larvae towards the shelf‐break, and mixing with trough inflow facilitates return toward the inner shelf. To examine the hypothesis, we compared samples of P. antarctica collected near Coulman Island in the outflow, along Crary Bank in the inflow, and a third set taken over the rest of the Ross Sea. We ruled out misidentification using an innovative genetic validation. Silverfish larvae comprised 99.5% of the catch, and the highest population densities were found in Drygalski Trough. The results provided no evidence to reject the population hypothesis. Abundance indices, back‐calculated hatching dates, length distributions and growth were congruent with a unified early life history in the western Ross Sea, constrained by cryopelagic early stages in Terra Nova Bay. By contrast, a sample in the Bay of Whales revealed much smaller larvae, suggesting either a geographically separate population in the eastern Ross Sea, or westward connectivity with larvae spawned nearby by fish sourced from troughs upstream in the Amundsen Sea. These results illustrate how hypotheses that integrate population structure with life history can provide precise spatial predictions for subsequent testing. |
format |
Article in Journal/Newspaper |
author |
Julian R. Ashford Robert B. Dunbar Lorenzo Zane Jilda Alicia Caccavo Cassandra M. Brooks Kimberly T. Goetz Mario La Mesa |
author_facet |
Julian R. Ashford Robert B. Dunbar Lorenzo Zane Jilda Alicia Caccavo Cassandra M. Brooks Kimberly T. Goetz Mario La Mesa |
author_sort |
Julian R. Ashford |
title |
Early life history connectivity of Antarctic silverfish ( Pleuragramma antarctica ) in the Ross Sea |
title_short |
Early life history connectivity of Antarctic silverfish ( Pleuragramma antarctica ) in the Ross Sea |
title_full |
Early life history connectivity of Antarctic silverfish ( Pleuragramma antarctica ) in the Ross Sea |
title_fullStr |
Early life history connectivity of Antarctic silverfish ( Pleuragramma antarctica ) in the Ross Sea |
title_full_unstemmed |
Early life history connectivity of Antarctic silverfish ( Pleuragramma antarctica ) in the Ross Sea |
title_sort |
early life history connectivity of antarctic silverfish ( pleuragramma antarctica ) in the ross sea |
publishDate |
2018 |
url |
https://www.openaccessrepository.it/record/103749 https://doi.org/10.1111/fog.12251 |
long_lat |
ENVELOPE(-170.000,-170.000,-77.833,-77.833) ENVELOPE(169.750,169.750,-73.467,-73.467) ENVELOPE(169.000,169.000,-75.000,-75.000) ENVELOPE(-61.000,-61.000,-64.717,-64.717) |
geographic |
Amundsen Sea Antarctic Bay of Whales Coulman Island Crary Bank Drygalski Ross Sea Terra Nova Bay |
geographic_facet |
Amundsen Sea Antarctic Bay of Whales Coulman Island Crary Bank Drygalski Ross Sea Terra Nova Bay |
genre |
Amundsen Sea Antarc* Antarctic Antarctic silverfish Antarctica Coulman Island Ross Sea |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctic silverfish Antarctica Coulman Island Ross Sea |
op_relation |
url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/103749 doi:10.1111/fog.12251 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1111/fog.12251 |
container_title |
Fisheries Oceanography |
container_volume |
27 |
container_issue |
3 |
container_start_page |
274 |
op_container_end_page |
287 |
_version_ |
1780728507429552128 |