Trophic Dynamics of Zooplankton Before and After Polar Night in the Kongsfjorden (Svalbard): Evidence of Trophic Position Estimated by δ15N Analysis of Amino Acids
In polar ecology, zooplankton diets and survival rates vary according to the seasonality of solar radiation and oceanographic conditions. Each zooplankton species has evolved feeding strategies to survive in the diet-limited conditions of the “polar night.” Many zooplankton studies have reported sea...
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ftdoajarticles:oai:doaj.org/article:ceb308e56fd34f378d97cda07c9e0619 2023-05-15T17:05:14+02:00 Trophic Dynamics of Zooplankton Before and After Polar Night in the Kongsfjorden (Svalbard): Evidence of Trophic Position Estimated by δ15N Analysis of Amino Acids Hyuntae Choi Sun-Yong Ha Seunghan Lee Jee-Hoon Kim Kyung-Hoon Shin 2020-07-01T00:00:00Z https://doi.org/10.3389/fmars.2020.00489 https://doaj.org/article/ceb308e56fd34f378d97cda07c9e0619 EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/fmars.2020.00489/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2020.00489 https://doaj.org/article/ceb308e56fd34f378d97cda07c9e0619 Frontiers in Marine Science, Vol 7 (2020) trophic position nitrogen isotope amino acid zooplankton Kongsfjorden Svalbard Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2020 ftdoajarticles https://doi.org/10.3389/fmars.2020.00489 2022-12-31T01:24:09Z In polar ecology, zooplankton diets and survival rates vary according to the seasonality of solar radiation and oceanographic conditions. Each zooplankton species has evolved feeding strategies to survive in the diet-limited conditions of the “polar night.” Many zooplankton studies have reported seasonal adaptations in feeding activity during polar night based on their trophic niches. Nitrogen isotope analysis of amino acids has provided improved accuracy in estimates of trophic position (TP) in various marine species. In this study, field work was conducted in Kongsfjorden before (October 2017) and after polar night (April 2018). As representative zooplankton, an amphipod (Themisto abyssorum), euphausids (Meganycitiphanes norvegica and Thysanoessa sp.), a chaetognath (Parasagitta elegans), and copepods (Calanus spp. and Oithona similis) were collected. trophic position values of each taxon were estimated using the nitrogen isotope ratio of glutamic acid (δ15NGlu) and phenylalanine (δ15NPhe). Results showed that TP values of P. elegans were relatively constant, averaging 3.2 in both seasons, likely due to continuous feeding activity during polar night. Trophic position values were also constant for Calanus spp., ranging 2.5–3.0 in both seasons, due to their ability to utilize stored high-energy wax. In contrast, average TP values for O. similis, an omnivorous zooplankton, were 2.9 in October and 2.3 the following April. Trophic position values for O. similis before polar night can be attributed to the relatively high availability of algae during longer periods of daylight. We found that TP variation in zooplankton before and after polar night differed according to feeding activities in diet-restricted circumstances. Article in Journal/Newspaper Kongsfjord* Kongsfjorden polar night Svalbard Themisto abyssorum Copepods Directory of Open Access Journals: DOAJ Articles Svalbard Frontiers in Marine Science 7 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
trophic position nitrogen isotope amino acid zooplankton Kongsfjorden Svalbard Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
trophic position nitrogen isotope amino acid zooplankton Kongsfjorden Svalbard Science Q General. Including nature conservation geographical distribution QH1-199.5 Hyuntae Choi Sun-Yong Ha Seunghan Lee Jee-Hoon Kim Kyung-Hoon Shin Trophic Dynamics of Zooplankton Before and After Polar Night in the Kongsfjorden (Svalbard): Evidence of Trophic Position Estimated by δ15N Analysis of Amino Acids |
topic_facet |
trophic position nitrogen isotope amino acid zooplankton Kongsfjorden Svalbard Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
In polar ecology, zooplankton diets and survival rates vary according to the seasonality of solar radiation and oceanographic conditions. Each zooplankton species has evolved feeding strategies to survive in the diet-limited conditions of the “polar night.” Many zooplankton studies have reported seasonal adaptations in feeding activity during polar night based on their trophic niches. Nitrogen isotope analysis of amino acids has provided improved accuracy in estimates of trophic position (TP) in various marine species. In this study, field work was conducted in Kongsfjorden before (October 2017) and after polar night (April 2018). As representative zooplankton, an amphipod (Themisto abyssorum), euphausids (Meganycitiphanes norvegica and Thysanoessa sp.), a chaetognath (Parasagitta elegans), and copepods (Calanus spp. and Oithona similis) were collected. trophic position values of each taxon were estimated using the nitrogen isotope ratio of glutamic acid (δ15NGlu) and phenylalanine (δ15NPhe). Results showed that TP values of P. elegans were relatively constant, averaging 3.2 in both seasons, likely due to continuous feeding activity during polar night. Trophic position values were also constant for Calanus spp., ranging 2.5–3.0 in both seasons, due to their ability to utilize stored high-energy wax. In contrast, average TP values for O. similis, an omnivorous zooplankton, were 2.9 in October and 2.3 the following April. Trophic position values for O. similis before polar night can be attributed to the relatively high availability of algae during longer periods of daylight. We found that TP variation in zooplankton before and after polar night differed according to feeding activities in diet-restricted circumstances. |
format |
Article in Journal/Newspaper |
author |
Hyuntae Choi Sun-Yong Ha Seunghan Lee Jee-Hoon Kim Kyung-Hoon Shin |
author_facet |
Hyuntae Choi Sun-Yong Ha Seunghan Lee Jee-Hoon Kim Kyung-Hoon Shin |
author_sort |
Hyuntae Choi |
title |
Trophic Dynamics of Zooplankton Before and After Polar Night in the Kongsfjorden (Svalbard): Evidence of Trophic Position Estimated by δ15N Analysis of Amino Acids |
title_short |
Trophic Dynamics of Zooplankton Before and After Polar Night in the Kongsfjorden (Svalbard): Evidence of Trophic Position Estimated by δ15N Analysis of Amino Acids |
title_full |
Trophic Dynamics of Zooplankton Before and After Polar Night in the Kongsfjorden (Svalbard): Evidence of Trophic Position Estimated by δ15N Analysis of Amino Acids |
title_fullStr |
Trophic Dynamics of Zooplankton Before and After Polar Night in the Kongsfjorden (Svalbard): Evidence of Trophic Position Estimated by δ15N Analysis of Amino Acids |
title_full_unstemmed |
Trophic Dynamics of Zooplankton Before and After Polar Night in the Kongsfjorden (Svalbard): Evidence of Trophic Position Estimated by δ15N Analysis of Amino Acids |
title_sort |
trophic dynamics of zooplankton before and after polar night in the kongsfjorden (svalbard): evidence of trophic position estimated by δ15n analysis of amino acids |
publisher |
Frontiers Media S.A. |
publishDate |
2020 |
url |
https://doi.org/10.3389/fmars.2020.00489 https://doaj.org/article/ceb308e56fd34f378d97cda07c9e0619 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Kongsfjord* Kongsfjorden polar night Svalbard Themisto abyssorum Copepods |
genre_facet |
Kongsfjord* Kongsfjorden polar night Svalbard Themisto abyssorum Copepods |
op_source |
Frontiers in Marine Science, Vol 7 (2020) |
op_relation |
https://www.frontiersin.org/article/10.3389/fmars.2020.00489/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2020.00489 https://doaj.org/article/ceb308e56fd34f378d97cda07c9e0619 |
op_doi |
https://doi.org/10.3389/fmars.2020.00489 |
container_title |
Frontiers in Marine Science |
container_volume |
7 |
_version_ |
1766059668479672320 |