Lingering Chukchi Sea sea ice and Chukchi Sea mean winds influence population age structure of euphausiids (krill) found in the bowhead whale feeding hotspot near Pt. Barrow, Alaska
Interannual variability in euphausiid (krill) abundance and population structure and associations of those measures with environmental drivers were investigated in an 11-year study conducted in late August–early September 2005–2015 in offshelf waters (bottom depth > 40 m) in Barrow Canyon and the...
Published in: | PLOS ONE |
---|---|
Main Authors: | , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Public Library of Science (PLoS)
2021
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1371/journal.pone.0254418 https://dx.plos.org/10.1371/journal.pone.0254418 |
id |
crplos:10.1371/journal.pone.0254418 |
---|---|
record_format |
openpolar |
spelling |
crplos:10.1371/journal.pone.0254418 2024-10-06T13:47:36+00:00 Lingering Chukchi Sea sea ice and Chukchi Sea mean winds influence population age structure of euphausiids (krill) found in the bowhead whale feeding hotspot near Pt. Barrow, Alaska Ashjian, Carin J. Okkonen, Stephen R. Campbell, Robert G. Alatalo, Philip Dam, Hans G. National Science Foundation National Science Foundation National Science Foundation National Science Foundation National Science Foundation National Science Foundation National Oceanic and Atmospheric Administration National Oceanic and Atmospheric Administration Bureau of Ocean Energy Management Bureau of Ocean Energy Management Bureau of Ocean Energy Management Office of Naval Research Coastal Marine Institute, University of Alaska Woods Hole Oceanographic Institution 2021 http://dx.doi.org/10.1371/journal.pone.0254418 https://dx.plos.org/10.1371/journal.pone.0254418 en eng Public Library of Science (PLoS) http://creativecommons.org/licenses/by/4.0/ PLOS ONE volume 16, issue 7, page e0254418 ISSN 1932-6203 journal-article 2021 crplos https://doi.org/10.1371/journal.pone.0254418 2024-09-10T04:17:44Z Interannual variability in euphausiid (krill) abundance and population structure and associations of those measures with environmental drivers were investigated in an 11-year study conducted in late August–early September 2005–2015 in offshelf waters (bottom depth > 40 m) in Barrow Canyon and the Beaufort Sea just downstream of Distributed Biological Observatory site 5 (DBO5) near Pt. Barrow, Alaska. Statistically-significant positive correlations were observed among krill population structure (proportion of juveniles and adults), the volume of Late Season Melt Water (LMW), and late-spring Chukchi Sea sea ice extent. High proportions of juvenile and adult krill were seen in years with larger volumes of LMW and greater spring sea ice extents (2006, 2009, 2012–2014) while the converse, high proportions of furcilia, were seen in years with smaller volumes of LMW and lower spring sea ice extent (2005, 2007, 2010, 2011, 2015). These different life stage, sea ice and water mass regimes represent integrated advective responses to mean fall and/or spring Chukchi Sea winds, driven by prevailing atmospheric pressure distributions in the two sets of years. In years with high proportions of juveniles and adults, late-spring and preceding-fall winds were weak and variable while in years with high proportions of furcilia, late-spring and preceding-fall winds were strong, easterly and consistent. The interaction of krill life history with yearly differences in the northward transports of krill and water masses along with sea ice retreat determines the population structure of late-summer krill populations in the DBO5 region near Pt. Barrow. Years with higher proportions of mature krill may provide larger prey to the Pt. Barrow area bowhead whale prey hotspot. The characteristics of prey near Pt. Barrow is dependent on krill abundance and size, large-scale environmental forcing, and interannual variability in recruitment success of krill in the Bering Sea. Article in Journal/Newspaper Barrow Beaufort Sea Bering Sea bowhead whale Chukchi Chukchi Sea Sea ice Alaska PLOS Barrow Canyon ENVELOPE(-154.000,-154.000,72.500,72.500) Bering Sea Chukchi Sea PLOS ONE 16 7 e0254418 |
institution |
Open Polar |
collection |
PLOS |
op_collection_id |
crplos |
language |
English |
description |
Interannual variability in euphausiid (krill) abundance and population structure and associations of those measures with environmental drivers were investigated in an 11-year study conducted in late August–early September 2005–2015 in offshelf waters (bottom depth > 40 m) in Barrow Canyon and the Beaufort Sea just downstream of Distributed Biological Observatory site 5 (DBO5) near Pt. Barrow, Alaska. Statistically-significant positive correlations were observed among krill population structure (proportion of juveniles and adults), the volume of Late Season Melt Water (LMW), and late-spring Chukchi Sea sea ice extent. High proportions of juvenile and adult krill were seen in years with larger volumes of LMW and greater spring sea ice extents (2006, 2009, 2012–2014) while the converse, high proportions of furcilia, were seen in years with smaller volumes of LMW and lower spring sea ice extent (2005, 2007, 2010, 2011, 2015). These different life stage, sea ice and water mass regimes represent integrated advective responses to mean fall and/or spring Chukchi Sea winds, driven by prevailing atmospheric pressure distributions in the two sets of years. In years with high proportions of juveniles and adults, late-spring and preceding-fall winds were weak and variable while in years with high proportions of furcilia, late-spring and preceding-fall winds were strong, easterly and consistent. The interaction of krill life history with yearly differences in the northward transports of krill and water masses along with sea ice retreat determines the population structure of late-summer krill populations in the DBO5 region near Pt. Barrow. Years with higher proportions of mature krill may provide larger prey to the Pt. Barrow area bowhead whale prey hotspot. The characteristics of prey near Pt. Barrow is dependent on krill abundance and size, large-scale environmental forcing, and interannual variability in recruitment success of krill in the Bering Sea. |
author2 |
Dam, Hans G. National Science Foundation National Science Foundation National Science Foundation National Science Foundation National Science Foundation National Science Foundation National Oceanic and Atmospheric Administration National Oceanic and Atmospheric Administration Bureau of Ocean Energy Management Bureau of Ocean Energy Management Bureau of Ocean Energy Management Office of Naval Research Coastal Marine Institute, University of Alaska Woods Hole Oceanographic Institution |
format |
Article in Journal/Newspaper |
author |
Ashjian, Carin J. Okkonen, Stephen R. Campbell, Robert G. Alatalo, Philip |
spellingShingle |
Ashjian, Carin J. Okkonen, Stephen R. Campbell, Robert G. Alatalo, Philip Lingering Chukchi Sea sea ice and Chukchi Sea mean winds influence population age structure of euphausiids (krill) found in the bowhead whale feeding hotspot near Pt. Barrow, Alaska |
author_facet |
Ashjian, Carin J. Okkonen, Stephen R. Campbell, Robert G. Alatalo, Philip |
author_sort |
Ashjian, Carin J. |
title |
Lingering Chukchi Sea sea ice and Chukchi Sea mean winds influence population age structure of euphausiids (krill) found in the bowhead whale feeding hotspot near Pt. Barrow, Alaska |
title_short |
Lingering Chukchi Sea sea ice and Chukchi Sea mean winds influence population age structure of euphausiids (krill) found in the bowhead whale feeding hotspot near Pt. Barrow, Alaska |
title_full |
Lingering Chukchi Sea sea ice and Chukchi Sea mean winds influence population age structure of euphausiids (krill) found in the bowhead whale feeding hotspot near Pt. Barrow, Alaska |
title_fullStr |
Lingering Chukchi Sea sea ice and Chukchi Sea mean winds influence population age structure of euphausiids (krill) found in the bowhead whale feeding hotspot near Pt. Barrow, Alaska |
title_full_unstemmed |
Lingering Chukchi Sea sea ice and Chukchi Sea mean winds influence population age structure of euphausiids (krill) found in the bowhead whale feeding hotspot near Pt. Barrow, Alaska |
title_sort |
lingering chukchi sea sea ice and chukchi sea mean winds influence population age structure of euphausiids (krill) found in the bowhead whale feeding hotspot near pt. barrow, alaska |
publisher |
Public Library of Science (PLoS) |
publishDate |
2021 |
url |
http://dx.doi.org/10.1371/journal.pone.0254418 https://dx.plos.org/10.1371/journal.pone.0254418 |
long_lat |
ENVELOPE(-154.000,-154.000,72.500,72.500) |
geographic |
Barrow Canyon Bering Sea Chukchi Sea |
geographic_facet |
Barrow Canyon Bering Sea Chukchi Sea |
genre |
Barrow Beaufort Sea Bering Sea bowhead whale Chukchi Chukchi Sea Sea ice Alaska |
genre_facet |
Barrow Beaufort Sea Bering Sea bowhead whale Chukchi Chukchi Sea Sea ice Alaska |
op_source |
PLOS ONE volume 16, issue 7, page e0254418 ISSN 1932-6203 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1371/journal.pone.0254418 |
container_title |
PLOS ONE |
container_volume |
16 |
container_issue |
7 |
container_start_page |
e0254418 |
_version_ |
1812175793100423168 |