Habitat partitioning in Antarctic krill: Spawning hotspots and nursery areas.
Antarctic krill, Euphausia superba, have a circumpolar distribution but are concentrated within the south-west Atlantic sector, where they support a unique food web and a commercial fishery. Within this sector, our first goal was to produce quantitative distribution maps of all six ontogenetic life...
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ftdoajarticles:oai:doaj.org/article:b3ef458a81a24e49be6c504459f03b2e 2023-05-15T13:51:23+02:00 Habitat partitioning in Antarctic krill: Spawning hotspots and nursery areas. Frances A Perry Angus Atkinson Sévrine F Sailley Geraint A Tarling Simeon L Hill Cathy H Lucas Daniel J Mayor 2019-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0219325 https://doaj.org/article/b3ef458a81a24e49be6c504459f03b2e EN eng Public Library of Science (PLoS) https://doi.org/10.1371/journal.pone.0219325 https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0219325 https://doaj.org/article/b3ef458a81a24e49be6c504459f03b2e PLoS ONE, Vol 14, Iss 7, p e0219325 (2019) Medicine R Science Q article 2019 ftdoajarticles https://doi.org/10.1371/journal.pone.0219325 2022-12-31T13:19:43Z Antarctic krill, Euphausia superba, have a circumpolar distribution but are concentrated within the south-west Atlantic sector, where they support a unique food web and a commercial fishery. Within this sector, our first goal was to produce quantitative distribution maps of all six ontogenetic life stages of krill (eggs, nauplii plus metanauplii, calyptopes, furcilia, juveniles, and adults), based on a compilation of all available post 1970s data. Using these maps, we then examined firstly whether "hotspots" of egg production and early stage nursery occurred, and secondly whether the available habitat was partitioned between the successive life stages during the austral summer and autumn, when krill densities can be high. To address these questions, we compiled larval krill density records and extracted data spanning 41 years (1976-2016) from the existing KRILLBASE-abundance and KRILLBASE-length-frequency databases. Although adult males and females of spawning age were widely distributed, the distribution of eggs, nauplii and metanauplii indicates that spawning is most intense over the shelf and shelf slope. This contrasts with the distributions of calyptope and furcilia larvae, which were concentrated further offshore, mainly in the Southern Scotia Sea. Juveniles, however, were strongly concentrated over shelves along the Scotia Arc. Simple environmental analyses based on water depth and mean water temperature suggest that krill associate with different habitats over the course of their life cycle. From the early to late part of the austral season, juvenile distribution moves from ocean to shelf, opposite in direction to that for adults. Such habitat partitioning may reduce intraspecific competition for food, which has been suggested to occur when densities are exceptionally high during years of strong recruitment. It also prevents any potential cannibalism by adults on younger stages. Understanding the location of krill spawning and juvenile development in relation to potentially overlapping fishing activities ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Scotia Sea Directory of Open Access Journals: DOAJ Articles Antarctic Austral Scotia Sea PLOS ONE 14 7 e0219325 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q Frances A Perry Angus Atkinson Sévrine F Sailley Geraint A Tarling Simeon L Hill Cathy H Lucas Daniel J Mayor Habitat partitioning in Antarctic krill: Spawning hotspots and nursery areas. |
topic_facet |
Medicine R Science Q |
description |
Antarctic krill, Euphausia superba, have a circumpolar distribution but are concentrated within the south-west Atlantic sector, where they support a unique food web and a commercial fishery. Within this sector, our first goal was to produce quantitative distribution maps of all six ontogenetic life stages of krill (eggs, nauplii plus metanauplii, calyptopes, furcilia, juveniles, and adults), based on a compilation of all available post 1970s data. Using these maps, we then examined firstly whether "hotspots" of egg production and early stage nursery occurred, and secondly whether the available habitat was partitioned between the successive life stages during the austral summer and autumn, when krill densities can be high. To address these questions, we compiled larval krill density records and extracted data spanning 41 years (1976-2016) from the existing KRILLBASE-abundance and KRILLBASE-length-frequency databases. Although adult males and females of spawning age were widely distributed, the distribution of eggs, nauplii and metanauplii indicates that spawning is most intense over the shelf and shelf slope. This contrasts with the distributions of calyptope and furcilia larvae, which were concentrated further offshore, mainly in the Southern Scotia Sea. Juveniles, however, were strongly concentrated over shelves along the Scotia Arc. Simple environmental analyses based on water depth and mean water temperature suggest that krill associate with different habitats over the course of their life cycle. From the early to late part of the austral season, juvenile distribution moves from ocean to shelf, opposite in direction to that for adults. Such habitat partitioning may reduce intraspecific competition for food, which has been suggested to occur when densities are exceptionally high during years of strong recruitment. It also prevents any potential cannibalism by adults on younger stages. Understanding the location of krill spawning and juvenile development in relation to potentially overlapping fishing activities ... |
format |
Article in Journal/Newspaper |
author |
Frances A Perry Angus Atkinson Sévrine F Sailley Geraint A Tarling Simeon L Hill Cathy H Lucas Daniel J Mayor |
author_facet |
Frances A Perry Angus Atkinson Sévrine F Sailley Geraint A Tarling Simeon L Hill Cathy H Lucas Daniel J Mayor |
author_sort |
Frances A Perry |
title |
Habitat partitioning in Antarctic krill: Spawning hotspots and nursery areas. |
title_short |
Habitat partitioning in Antarctic krill: Spawning hotspots and nursery areas. |
title_full |
Habitat partitioning in Antarctic krill: Spawning hotspots and nursery areas. |
title_fullStr |
Habitat partitioning in Antarctic krill: Spawning hotspots and nursery areas. |
title_full_unstemmed |
Habitat partitioning in Antarctic krill: Spawning hotspots and nursery areas. |
title_sort |
habitat partitioning in antarctic krill: spawning hotspots and nursery areas. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2019 |
url |
https://doi.org/10.1371/journal.pone.0219325 https://doaj.org/article/b3ef458a81a24e49be6c504459f03b2e |
geographic |
Antarctic Austral Scotia Sea |
geographic_facet |
Antarctic Austral Scotia Sea |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Scotia Sea |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Scotia Sea |
op_source |
PLoS ONE, Vol 14, Iss 7, p e0219325 (2019) |
op_relation |
https://doi.org/10.1371/journal.pone.0219325 https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0219325 https://doaj.org/article/b3ef458a81a24e49be6c504459f03b2e |
op_doi |
https://doi.org/10.1371/journal.pone.0219325 |
container_title |
PLOS ONE |
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14 |
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7 |
container_start_page |
e0219325 |
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