Coincident mass occurrence of gelatinous zooplankton in northern Norway
© The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Frontiers in Marine Science 5 (2018): 158, doi:10.3389/fmars.2018.00158. In autumn 2015, several sources reported observations of large amounts of g...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/10405 2023-05-15T17:43:38+02:00 Coincident mass occurrence of gelatinous zooplankton in northern Norway Knutsen, Tor Hosia, Aino Falkenhaug, Tone Skern-Mauritzen, Rasmus Wiebe, Peter Larsen, Roger B. Aglen, Asgeir Berg, Erik 2018-05-23 https://hdl.handle.net/1912/10405 en_US eng Frontiers Media https://doi.org/10.3389/fmars.2018.00158 Frontiers in Marine Science 5 (2018): 158 https://hdl.handle.net/1912/10405 doi:10.3389/fmars.2018.00158 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ CC-BY Frontiers in Marine Science 5 (2018): 158 doi:10.3389/fmars.2018.00158 Jellyfish bloom Genetics Acoustics Nanomia North Norwegian fjords Gelatinous zooplankton Article 2018 ftwhoas https://doi.org/10.3389/fmars.2018.00158 2022-05-28T23:00:25Z © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Frontiers in Marine Science 5 (2018): 158, doi:10.3389/fmars.2018.00158. In autumn 2015, several sources reported observations of large amounts of gelatinous material in a large north Norwegian fjord system, either caught when trawling for other organisms or fouling fishing gear. The responsible organism was identified as a physonect siphonophore, Nanomia cara, while a ctenophore, Beroe cucumis, and a hydromedusa, Modeeria rotunda, were also registered in high abundances on a couple of occasions. To document the phenomena, we have compiled a variety of data from concurrent fisheries surveys and local fishermen, including physical samples, trawl catch, and acoustic data, photo and video evidence, and environmental data. Because of the gas-filled pneumatophore, characteristic for these types of siphonophores, acoustics provided detailed and unique insight to the horizontal and vertical distribution and potential abundances (~0.2–20 colonies·m−3) of N. cara with the highest concentrations observed in the near bottom region at ~320 m depth in the study area. This suggests that these animals were retained and accumulated in the deep basins of the fjord system possibly blooming here because of favorable environmental conditions and potentially higher prey availability compared to the shallower shelf areas to the north. Few cues as to the origin and onset of the bloom were found, but it may have originated from locally resident siphonophores. The characteristics of the deep-water masses in the fjord basins were different compared to the deep water outside the fjord system, suggesting no recent deep-water import to the fjords. However, water-masses containing siphonophores (not necessarily very abundant), may have been additionally introduced to the fjords at intermediate depths, with the animals subsequently trapped in the deeper fjord basins. The simultaneous ... Article in Journal/Newspaper Northern Norway Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Cara ENVELOPE(161.100,161.100,-82.750,-82.750) Norway Rotunda ENVELOPE(161.567,161.567,-78.017,-78.017) Frontiers in Marine Science 5 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Jellyfish bloom Genetics Acoustics Nanomia North Norwegian fjords Gelatinous zooplankton |
spellingShingle |
Jellyfish bloom Genetics Acoustics Nanomia North Norwegian fjords Gelatinous zooplankton Knutsen, Tor Hosia, Aino Falkenhaug, Tone Skern-Mauritzen, Rasmus Wiebe, Peter Larsen, Roger B. Aglen, Asgeir Berg, Erik Coincident mass occurrence of gelatinous zooplankton in northern Norway |
topic_facet |
Jellyfish bloom Genetics Acoustics Nanomia North Norwegian fjords Gelatinous zooplankton |
description |
© The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Frontiers in Marine Science 5 (2018): 158, doi:10.3389/fmars.2018.00158. In autumn 2015, several sources reported observations of large amounts of gelatinous material in a large north Norwegian fjord system, either caught when trawling for other organisms or fouling fishing gear. The responsible organism was identified as a physonect siphonophore, Nanomia cara, while a ctenophore, Beroe cucumis, and a hydromedusa, Modeeria rotunda, were also registered in high abundances on a couple of occasions. To document the phenomena, we have compiled a variety of data from concurrent fisheries surveys and local fishermen, including physical samples, trawl catch, and acoustic data, photo and video evidence, and environmental data. Because of the gas-filled pneumatophore, characteristic for these types of siphonophores, acoustics provided detailed and unique insight to the horizontal and vertical distribution and potential abundances (~0.2–20 colonies·m−3) of N. cara with the highest concentrations observed in the near bottom region at ~320 m depth in the study area. This suggests that these animals were retained and accumulated in the deep basins of the fjord system possibly blooming here because of favorable environmental conditions and potentially higher prey availability compared to the shallower shelf areas to the north. Few cues as to the origin and onset of the bloom were found, but it may have originated from locally resident siphonophores. The characteristics of the deep-water masses in the fjord basins were different compared to the deep water outside the fjord system, suggesting no recent deep-water import to the fjords. However, water-masses containing siphonophores (not necessarily very abundant), may have been additionally introduced to the fjords at intermediate depths, with the animals subsequently trapped in the deeper fjord basins. The simultaneous ... |
format |
Article in Journal/Newspaper |
author |
Knutsen, Tor Hosia, Aino Falkenhaug, Tone Skern-Mauritzen, Rasmus Wiebe, Peter Larsen, Roger B. Aglen, Asgeir Berg, Erik |
author_facet |
Knutsen, Tor Hosia, Aino Falkenhaug, Tone Skern-Mauritzen, Rasmus Wiebe, Peter Larsen, Roger B. Aglen, Asgeir Berg, Erik |
author_sort |
Knutsen, Tor |
title |
Coincident mass occurrence of gelatinous zooplankton in northern Norway |
title_short |
Coincident mass occurrence of gelatinous zooplankton in northern Norway |
title_full |
Coincident mass occurrence of gelatinous zooplankton in northern Norway |
title_fullStr |
Coincident mass occurrence of gelatinous zooplankton in northern Norway |
title_full_unstemmed |
Coincident mass occurrence of gelatinous zooplankton in northern Norway |
title_sort |
coincident mass occurrence of gelatinous zooplankton in northern norway |
publisher |
Frontiers Media |
publishDate |
2018 |
url |
https://hdl.handle.net/1912/10405 |
long_lat |
ENVELOPE(161.100,161.100,-82.750,-82.750) ENVELOPE(161.567,161.567,-78.017,-78.017) |
geographic |
Cara Norway Rotunda |
geographic_facet |
Cara Norway Rotunda |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
Frontiers in Marine Science 5 (2018): 158 doi:10.3389/fmars.2018.00158 |
op_relation |
https://doi.org/10.3389/fmars.2018.00158 Frontiers in Marine Science 5 (2018): 158 https://hdl.handle.net/1912/10405 doi:10.3389/fmars.2018.00158 |
op_rights |
Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2018.00158 |
container_title |
Frontiers in Marine Science |
container_volume |
5 |
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1766145760514015232 |