Coincident mass occurrence of gelatinous zooplankton in Northern Norway
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 c...
Published in: | Frontiers in Marine Science |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Frontiers Media
2018
|
Subjects: | |
Online Access: | https://hdl.handle.net/1956/19218 https://doi.org/10.3389/fmars.2018.00158 |
id |
ftunivbergen:oai:bora.uib.no:1956/19218 |
---|---|
record_format |
openpolar |
spelling |
ftunivbergen:oai:bora.uib.no:1956/19218 2023-05-15T17:05:44+02:00 Coincident mass occurrence of gelatinous zooplankton in Northern Norway Knutsen, Tor Hosia, Aino Falkenhaug, Tone Skern-Mauritzen, Rasmus Wiebe, Peter H. Larsen, Roger B. Aglen, Asgeir Berg, Erik 2018-06-26T08:35:34Z application/pdf https://hdl.handle.net/1956/19218 https://doi.org/10.3389/fmars.2018.00158 eng eng Frontiers Media Norges forskningsråd: 228896 Havforskningsinstituttet: Prosjektfinansiering Norges forskningsråd: 248799 Artsdatabanken: 70184215 Artsdatabanken: 70184233 urn:issn:2296-7745 https://hdl.handle.net/1956/19218 https://doi.org/10.3389/fmars.2018.00158 cristin:1592614 Attribution CC BY http://creativecommons.org/licenses/by/4.0/ Copyright 2018 The Authors Frontiers in Marine Science jellyfish bloom genetics acoustics Nanomia North Norwegian fjords gelatinous zooplankton Peer reviewed Journal article 2018 ftunivbergen https://doi.org/10.3389/fmars.2018.00158 2023-03-14T17:42:41Z 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 observations of abundant siphonophores, hydromedusae, and ctenophores in the Lyngen-Kvænangen fjord system are intriguing, but difficult to provide a unified explanation for, as the organisms differ in their biology and ecology. ... Article in Journal/Newspaper Kvænangen Northern Norway Lyngen University of Bergen: Bergen Open Research Archive (BORA-UiB) Cara ENVELOPE(161.100,161.100,-82.750,-82.750) Kvænangen ENVELOPE(21.726,21.726,69.931,69.931) Norway Rotunda ENVELOPE(161.567,161.567,-78.017,-78.017) Frontiers in Marine Science 5 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
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 H. 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 |
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 observations of abundant siphonophores, hydromedusae, and ctenophores in the Lyngen-Kvænangen fjord system are intriguing, but difficult to provide a unified explanation for, as the organisms differ in their biology and ecology. ... |
format |
Article in Journal/Newspaper |
author |
Knutsen, Tor Hosia, Aino Falkenhaug, Tone Skern-Mauritzen, Rasmus Wiebe, Peter H. Larsen, Roger B. Aglen, Asgeir Berg, Erik |
author_facet |
Knutsen, Tor Hosia, Aino Falkenhaug, Tone Skern-Mauritzen, Rasmus Wiebe, Peter H. 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/1956/19218 https://doi.org/10.3389/fmars.2018.00158 |
long_lat |
ENVELOPE(161.100,161.100,-82.750,-82.750) ENVELOPE(21.726,21.726,69.931,69.931) ENVELOPE(161.567,161.567,-78.017,-78.017) |
geographic |
Cara Kvænangen Norway Rotunda |
geographic_facet |
Cara Kvænangen Norway Rotunda |
genre |
Kvænangen Northern Norway Lyngen |
genre_facet |
Kvænangen Northern Norway Lyngen |
op_source |
Frontiers in Marine Science |
op_relation |
Norges forskningsråd: 228896 Havforskningsinstituttet: Prosjektfinansiering Norges forskningsråd: 248799 Artsdatabanken: 70184215 Artsdatabanken: 70184233 urn:issn:2296-7745 https://hdl.handle.net/1956/19218 https://doi.org/10.3389/fmars.2018.00158 cristin:1592614 |
op_rights |
Attribution CC BY http://creativecommons.org/licenses/by/4.0/ Copyright 2018 The Authors |
op_doi |
https://doi.org/10.3389/fmars.2018.00158 |
container_title |
Frontiers in Marine Science |
container_volume |
5 |
_version_ |
1766060468427816960 |