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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ftpubmed:oai:pubmedcentral.nih.gov:6655634 2023-05-15T14:03:10+02:00 Habitat partitioning in Antarctic krill: Spawning hotspots and nursery areas Perry, Frances A. Atkinson, Angus Sailley, Sévrine F. Tarling, Geraint A. Hill, Simeon L. Lucas, Cathy H. Mayor, Daniel J. 2019-07-24 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6655634/ http://www.ncbi.nlm.nih.gov/pubmed/31339923 https://doi.org/10.1371/journal.pone.0219325 en eng Public Library of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6655634/ http://www.ncbi.nlm.nih.gov/pubmed/31339923 http://dx.doi.org/10.1371/journal.pone.0219325 © 2019 Perry et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. CC-BY Research Article Text 2019 ftpubmed https://doi.org/10.1371/journal.pone.0219325 2019-08-18T00:20:31Z 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 ... Text Antarc* Antarctic Antarctic Krill Euphausia superba Scotia Sea PubMed Central (PMC) Antarctic Austral Scotia Sea PLOS ONE 14 7 e0219325 |
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Research Article |
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Research Article Perry, Frances A. Atkinson, Angus Sailley, Sévrine F. Tarling, Geraint A. Hill, Simeon L. Lucas, Cathy H. Mayor, Daniel J. Habitat partitioning in Antarctic krill: Spawning hotspots and nursery areas |
topic_facet |
Research Article |
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 |
Text |
author |
Perry, Frances A. Atkinson, Angus Sailley, Sévrine F. Tarling, Geraint A. Hill, Simeon L. Lucas, Cathy H. Mayor, Daniel J. |
author_facet |
Perry, Frances A. Atkinson, Angus Sailley, Sévrine F. Tarling, Geraint A. Hill, Simeon L. Lucas, Cathy H. Mayor, Daniel J. |
author_sort |
Perry, Frances A. |
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 |
publishDate |
2019 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6655634/ http://www.ncbi.nlm.nih.gov/pubmed/31339923 https://doi.org/10.1371/journal.pone.0219325 |
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_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6655634/ http://www.ncbi.nlm.nih.gov/pubmed/31339923 http://dx.doi.org/10.1371/journal.pone.0219325 |
op_rights |
© 2019 Perry et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0219325 |
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PLOS ONE |
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14 |
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