Seasonal zooplankton dynamics in Svalbard coastal waters: The shifting dominance of mero- and holoplankton and timing of reproduction in three species of Copepoda
Monthly sampling was conducted in the ice-free Adventfjorden in West Spitsbergen, Svalbard, from March to November 2018 to assess the seasonal development in the Arctic zooplankton community and to investigate the seasonally shifting importance of meroplankton and holoplankton. Special focus was put...
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Language: | English |
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The University of Bergen
2019
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Online Access: | https://hdl.handle.net/1956/20058 |
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ftunivbergen:oai:bora.uib.no:1956/20058 2023-05-15T13:05:52+02:00 Seasonal zooplankton dynamics in Svalbard coastal waters: The shifting dominance of mero- and holoplankton and timing of reproduction in three species of Copepoda Nyeggen, Margot Ulfsdatter 2019-06-14T22:00:11Z application/pdf https://hdl.handle.net/1956/20058 eng eng The University of Bergen https://hdl.handle.net/1956/20058 Copyright the Author. All rights reserved Meroplankton Oithona Svalbard Seasonal dynamics Reproduction Pseudocalanus Arctic Calanus Zooplankton Holoplankton Sea ice 751999 Master thesis 2019 ftunivbergen 2023-03-14T17:42:19Z Monthly sampling was conducted in the ice-free Adventfjorden in West Spitsbergen, Svalbard, from March to November 2018 to assess the seasonal development in the Arctic zooplankton community and to investigate the seasonally shifting importance of meroplankton and holoplankton. Special focus was put on the reproduction strategy of three taxa of Copepoda: Calanus spp. Leach, 1816, Pseudocalanus spp. Boeck, 1872 and Oithona similis Claus, 1866. Additionally, three ice-covered fjords, Van Mijenfjorden in West Spitsbergen and Inglefieldbukta and Agardhbukta in East, were sampled in March and April to investigate the impact of sea ice on zooplankton species composition and abundance. Regarding the physical and biological environment in Adventfjorden, chlorophyll a was found in highest concentrations in May although the water column was still unstratified. Simultaneously with the high chlorophyll a concentrations, Cirripedia larvae (meroplankton) greatly dominated the zooplankton community. Throughout the remaining sampling period in Adventfjorden, holoplankton dominated. Of these, Copepoda was the most dominating order whereof Oithona similis was found to be the most numerically important copepod, followed by Calanus spp. and Pseudocalanus spp. The stage distribution of Calanus spp. suggested a dominance of individuals completing their life cycle within one year, with reproduction timed so as the nauplii could take advantage of the spring bloom in May. For Pseudocalanus spp. however, the stage distribution indicated a continuous reproduction with hatching occurring from the end of March until the end of August. Identification of the Pseudocalanus spp. by species-specific PCR and Illumina sequencing suggested a dominance of P. acuspes (Giesbrect, 1881) and P. moultoni Frost, 1989 amongst the reproducing population in Adventfjorden, while older stages of P. minutus (Krøyer, 1845) that were found might have been advected into the fjord. Abundance of small (<150 µm) Copepoda nauplii and presence of young Oithona spp. ... Master Thesis Adventfjorden Arctic Sea ice Svalbard Van Mijenfjorden Zooplankton Spitsbergen University of Bergen: Bergen Open Research Archive (BORA-UiB) Adventfjorden ENVELOPE(15.515,15.515,78.258,78.258) Agardhbukta ENVELOPE(18.519,18.519,78.021,78.021) Arctic Svalbard Van Mijenfjorden ENVELOPE(14.667,14.667,77.717,77.717) |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Meroplankton Oithona Svalbard Seasonal dynamics Reproduction Pseudocalanus Arctic Calanus Zooplankton Holoplankton Sea ice 751999 |
spellingShingle |
Meroplankton Oithona Svalbard Seasonal dynamics Reproduction Pseudocalanus Arctic Calanus Zooplankton Holoplankton Sea ice 751999 Nyeggen, Margot Ulfsdatter Seasonal zooplankton dynamics in Svalbard coastal waters: The shifting dominance of mero- and holoplankton and timing of reproduction in three species of Copepoda |
topic_facet |
Meroplankton Oithona Svalbard Seasonal dynamics Reproduction Pseudocalanus Arctic Calanus Zooplankton Holoplankton Sea ice 751999 |
description |
Monthly sampling was conducted in the ice-free Adventfjorden in West Spitsbergen, Svalbard, from March to November 2018 to assess the seasonal development in the Arctic zooplankton community and to investigate the seasonally shifting importance of meroplankton and holoplankton. Special focus was put on the reproduction strategy of three taxa of Copepoda: Calanus spp. Leach, 1816, Pseudocalanus spp. Boeck, 1872 and Oithona similis Claus, 1866. Additionally, three ice-covered fjords, Van Mijenfjorden in West Spitsbergen and Inglefieldbukta and Agardhbukta in East, were sampled in March and April to investigate the impact of sea ice on zooplankton species composition and abundance. Regarding the physical and biological environment in Adventfjorden, chlorophyll a was found in highest concentrations in May although the water column was still unstratified. Simultaneously with the high chlorophyll a concentrations, Cirripedia larvae (meroplankton) greatly dominated the zooplankton community. Throughout the remaining sampling period in Adventfjorden, holoplankton dominated. Of these, Copepoda was the most dominating order whereof Oithona similis was found to be the most numerically important copepod, followed by Calanus spp. and Pseudocalanus spp. The stage distribution of Calanus spp. suggested a dominance of individuals completing their life cycle within one year, with reproduction timed so as the nauplii could take advantage of the spring bloom in May. For Pseudocalanus spp. however, the stage distribution indicated a continuous reproduction with hatching occurring from the end of March until the end of August. Identification of the Pseudocalanus spp. by species-specific PCR and Illumina sequencing suggested a dominance of P. acuspes (Giesbrect, 1881) and P. moultoni Frost, 1989 amongst the reproducing population in Adventfjorden, while older stages of P. minutus (Krøyer, 1845) that were found might have been advected into the fjord. Abundance of small (<150 µm) Copepoda nauplii and presence of young Oithona spp. ... |
format |
Master Thesis |
author |
Nyeggen, Margot Ulfsdatter |
author_facet |
Nyeggen, Margot Ulfsdatter |
author_sort |
Nyeggen, Margot Ulfsdatter |
title |
Seasonal zooplankton dynamics in Svalbard coastal waters: The shifting dominance of mero- and holoplankton and timing of reproduction in three species of Copepoda |
title_short |
Seasonal zooplankton dynamics in Svalbard coastal waters: The shifting dominance of mero- and holoplankton and timing of reproduction in three species of Copepoda |
title_full |
Seasonal zooplankton dynamics in Svalbard coastal waters: The shifting dominance of mero- and holoplankton and timing of reproduction in three species of Copepoda |
title_fullStr |
Seasonal zooplankton dynamics in Svalbard coastal waters: The shifting dominance of mero- and holoplankton and timing of reproduction in three species of Copepoda |
title_full_unstemmed |
Seasonal zooplankton dynamics in Svalbard coastal waters: The shifting dominance of mero- and holoplankton and timing of reproduction in three species of Copepoda |
title_sort |
seasonal zooplankton dynamics in svalbard coastal waters: the shifting dominance of mero- and holoplankton and timing of reproduction in three species of copepoda |
publisher |
The University of Bergen |
publishDate |
2019 |
url |
https://hdl.handle.net/1956/20058 |
long_lat |
ENVELOPE(15.515,15.515,78.258,78.258) ENVELOPE(18.519,18.519,78.021,78.021) ENVELOPE(14.667,14.667,77.717,77.717) |
geographic |
Adventfjorden Agardhbukta Arctic Svalbard Van Mijenfjorden |
geographic_facet |
Adventfjorden Agardhbukta Arctic Svalbard Van Mijenfjorden |
genre |
Adventfjorden Arctic Sea ice Svalbard Van Mijenfjorden Zooplankton Spitsbergen |
genre_facet |
Adventfjorden Arctic Sea ice Svalbard Van Mijenfjorden Zooplankton Spitsbergen |
op_relation |
https://hdl.handle.net/1956/20058 |
op_rights |
Copyright the Author. All rights reserved |
_version_ |
1766395709927456768 |