Seasonal and diel patterns in sedimentary flux of krill fecal pellets recorded by an echo sounder
We used a moored upward‐facing 200 kHz echo sounder to address sedimentation of fecal pellets (FPs) from dielly migrating Meganyctiphanes norvegica . The echo sounder was located on the bottom at 150 m depth in the Oslofjord, Norway, and was cabled to shore for continuous measurements during winter...
Published in: | Limnology and Oceanography |
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Language: | English |
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Online Access: | http://dx.doi.org/10.4319/lo.2013.58.6.1985 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2013.58.6.1985 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2013.58.6.1985 |
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crwiley:10.4319/lo.2013.58.6.1985 2024-06-23T07:54:32+00:00 Seasonal and diel patterns in sedimentary flux of krill fecal pellets recorded by an echo sounder Røstad, Anders Kaartvedt, Stein 2013 http://dx.doi.org/10.4319/lo.2013.58.6.1985 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2013.58.6.1985 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2013.58.6.1985 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 58, issue 6, page 1985-1997 ISSN 0024-3590 1939-5590 journal-article 2013 crwiley https://doi.org/10.4319/lo.2013.58.6.1985 2024-06-11T04:47:11Z We used a moored upward‐facing 200 kHz echo sounder to address sedimentation of fecal pellets (FPs) from dielly migrating Meganyctiphanes norvegica . The echo sounder was located on the bottom at 150 m depth in the Oslofjord, Norway, and was cabled to shore for continuous measurements during winter and spring. Records of sinking pellets were for the first time observed with an echo sounder. Seasonal patterns of sedimentation of krill FPs were strongly correlated with data from continuous measurement of fluorescence, which illustrate the development of the spring bloom. Sedimenting particles were first observed as fluorescence values started to increase at the end of February and continued to increase until the bloom suddenly culminated at the end of March. This collapse of the bloom was detected on the echo sounder as a pulse of slowly sinking acoustic targets over a 2 d period. Prior to this event, there was a strong diel pattern in sedimentation, which correlated, with some time lag, with the diel migration of krill foraging at night near the surface. Pellet average sinking speeds ranged between 423 m d −1 and 804 m d −1 , with a strong relation to pellet target strength, which is an acoustic proxy for size. This novel approach shows that echo sounders may be a valuable tool in studies of vertical pellet flux and, thereby, carbon flux, providing temporal resolution and direct observation of the sedimentation process, which are not obtained from standard methods. Article in Journal/Newspaper Meganyctiphanes norvegica Wiley Online Library Norway Limnology and Oceanography 58 6 1985 1997 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
We used a moored upward‐facing 200 kHz echo sounder to address sedimentation of fecal pellets (FPs) from dielly migrating Meganyctiphanes norvegica . The echo sounder was located on the bottom at 150 m depth in the Oslofjord, Norway, and was cabled to shore for continuous measurements during winter and spring. Records of sinking pellets were for the first time observed with an echo sounder. Seasonal patterns of sedimentation of krill FPs were strongly correlated with data from continuous measurement of fluorescence, which illustrate the development of the spring bloom. Sedimenting particles were first observed as fluorescence values started to increase at the end of February and continued to increase until the bloom suddenly culminated at the end of March. This collapse of the bloom was detected on the echo sounder as a pulse of slowly sinking acoustic targets over a 2 d period. Prior to this event, there was a strong diel pattern in sedimentation, which correlated, with some time lag, with the diel migration of krill foraging at night near the surface. Pellet average sinking speeds ranged between 423 m d −1 and 804 m d −1 , with a strong relation to pellet target strength, which is an acoustic proxy for size. This novel approach shows that echo sounders may be a valuable tool in studies of vertical pellet flux and, thereby, carbon flux, providing temporal resolution and direct observation of the sedimentation process, which are not obtained from standard methods. |
format |
Article in Journal/Newspaper |
author |
Røstad, Anders Kaartvedt, Stein |
spellingShingle |
Røstad, Anders Kaartvedt, Stein Seasonal and diel patterns in sedimentary flux of krill fecal pellets recorded by an echo sounder |
author_facet |
Røstad, Anders Kaartvedt, Stein |
author_sort |
Røstad, Anders |
title |
Seasonal and diel patterns in sedimentary flux of krill fecal pellets recorded by an echo sounder |
title_short |
Seasonal and diel patterns in sedimentary flux of krill fecal pellets recorded by an echo sounder |
title_full |
Seasonal and diel patterns in sedimentary flux of krill fecal pellets recorded by an echo sounder |
title_fullStr |
Seasonal and diel patterns in sedimentary flux of krill fecal pellets recorded by an echo sounder |
title_full_unstemmed |
Seasonal and diel patterns in sedimentary flux of krill fecal pellets recorded by an echo sounder |
title_sort |
seasonal and diel patterns in sedimentary flux of krill fecal pellets recorded by an echo sounder |
publisher |
Wiley |
publishDate |
2013 |
url |
http://dx.doi.org/10.4319/lo.2013.58.6.1985 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2013.58.6.1985 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2013.58.6.1985 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Meganyctiphanes norvegica |
genre_facet |
Meganyctiphanes norvegica |
op_source |
Limnology and Oceanography volume 58, issue 6, page 1985-1997 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2013.58.6.1985 |
container_title |
Limnology and Oceanography |
container_volume |
58 |
container_issue |
6 |
container_start_page |
1985 |
op_container_end_page |
1997 |
_version_ |
1802646721563459584 |