Dynamics of Calanus Copepodite Structure during Little Auks’ Breeding Seasons in Two Different Svalbard Locations
Populations dynamics of key zooplankton species in the European Arctic, Calanus finmarchicus and Calanus glacialis (hereafter defined as Calanus ) may be sensitive to climate changes, which in turn is of great importance for higher trophic levels. The aim of this study was to investigate the complet...
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ftdoajarticles:oai:doaj.org/article:21fb96ff003c4e35986692a0c40abca9 2023-05-15T15:12:40+02:00 Dynamics of Calanus Copepodite Structure during Little Auks’ Breeding Seasons in Two Different Svalbard Locations Kaja Balazy Emilia Trudnowska Katarzyna Błachowiak-Samołyk 2019-07-01T00:00:00Z https://doi.org/10.3390/w11071405 https://doaj.org/article/21fb96ff003c4e35986692a0c40abca9 EN eng MDPI AG https://www.mdpi.com/2073-4441/11/7/1405 https://doaj.org/toc/2073-4441 2073-4441 doi:10.3390/w11071405 https://doaj.org/article/21fb96ff003c4e35986692a0c40abca9 Water, Vol 11, Iss 7, p 1405 (2019) population dynamics size match-mismatch Spitsbergen laser optical plankton counter Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 article 2019 ftdoajarticles https://doi.org/10.3390/w11071405 2022-12-31T02:07:26Z Populations dynamics of key zooplankton species in the European Arctic, Calanus finmarchicus and Calanus glacialis (hereafter defined as Calanus ) may be sensitive to climate changes, which in turn is of great importance for higher trophic levels. The aim of this study was to investigate the complete copepodite structure and dynamics of Calanus populations in terms of body size, phenology and their relative role in the zooplankton community over time in different hydrographic conditions (two fjords on the West Spitsbergen Shelf, cold Hornsund vs. warm Kongsfjorden), from the perspective of their planktivorous predator, the little auk. High-resolution zooplankton measurements (taken by nets and a laser optical plankton counter) were adapted to the timing of bird’s breeding in the 2015 and 2016 summer seasons, and to their maximal diving depth (≤50 m). In Hornsund, the share of the Calanus in zooplankton community was greater and the copepodite structure was progressively older over time, matching the little auks timing. The importance of Calanus was much lower in Kongsfjorden, as represented mainly by younger copepodites, presumably due to the Atlantic water advections, thus making this area a less favourable feeding ground. Our results highlight the need for further studies on the match/mismatch between Calanus and little auks, because the observed trend of altered age structure towards a domination of young copepodites and the body size reduction of Calanus associated with higher seawater temperatures may result in insufficient food availability for these seabirds in the future. Article in Journal/Newspaper Arctic Calanus finmarchicus Calanus glacialis Hornsund Kongsfjord* Kongsfjorden little auk Svalbard Zooplankton Spitsbergen Directory of Open Access Journals: DOAJ Articles Arctic Svalbard Hornsund ENVELOPE(15.865,15.865,76.979,76.979) Water 11 7 1405 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
population dynamics size match-mismatch Spitsbergen laser optical plankton counter Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 |
spellingShingle |
population dynamics size match-mismatch Spitsbergen laser optical plankton counter Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 Kaja Balazy Emilia Trudnowska Katarzyna Błachowiak-Samołyk Dynamics of Calanus Copepodite Structure during Little Auks’ Breeding Seasons in Two Different Svalbard Locations |
topic_facet |
population dynamics size match-mismatch Spitsbergen laser optical plankton counter Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 |
description |
Populations dynamics of key zooplankton species in the European Arctic, Calanus finmarchicus and Calanus glacialis (hereafter defined as Calanus ) may be sensitive to climate changes, which in turn is of great importance for higher trophic levels. The aim of this study was to investigate the complete copepodite structure and dynamics of Calanus populations in terms of body size, phenology and their relative role in the zooplankton community over time in different hydrographic conditions (two fjords on the West Spitsbergen Shelf, cold Hornsund vs. warm Kongsfjorden), from the perspective of their planktivorous predator, the little auk. High-resolution zooplankton measurements (taken by nets and a laser optical plankton counter) were adapted to the timing of bird’s breeding in the 2015 and 2016 summer seasons, and to their maximal diving depth (≤50 m). In Hornsund, the share of the Calanus in zooplankton community was greater and the copepodite structure was progressively older over time, matching the little auks timing. The importance of Calanus was much lower in Kongsfjorden, as represented mainly by younger copepodites, presumably due to the Atlantic water advections, thus making this area a less favourable feeding ground. Our results highlight the need for further studies on the match/mismatch between Calanus and little auks, because the observed trend of altered age structure towards a domination of young copepodites and the body size reduction of Calanus associated with higher seawater temperatures may result in insufficient food availability for these seabirds in the future. |
format |
Article in Journal/Newspaper |
author |
Kaja Balazy Emilia Trudnowska Katarzyna Błachowiak-Samołyk |
author_facet |
Kaja Balazy Emilia Trudnowska Katarzyna Błachowiak-Samołyk |
author_sort |
Kaja Balazy |
title |
Dynamics of Calanus Copepodite Structure during Little Auks’ Breeding Seasons in Two Different Svalbard Locations |
title_short |
Dynamics of Calanus Copepodite Structure during Little Auks’ Breeding Seasons in Two Different Svalbard Locations |
title_full |
Dynamics of Calanus Copepodite Structure during Little Auks’ Breeding Seasons in Two Different Svalbard Locations |
title_fullStr |
Dynamics of Calanus Copepodite Structure during Little Auks’ Breeding Seasons in Two Different Svalbard Locations |
title_full_unstemmed |
Dynamics of Calanus Copepodite Structure during Little Auks’ Breeding Seasons in Two Different Svalbard Locations |
title_sort |
dynamics of calanus copepodite structure during little auks’ breeding seasons in two different svalbard locations |
publisher |
MDPI AG |
publishDate |
2019 |
url |
https://doi.org/10.3390/w11071405 https://doaj.org/article/21fb96ff003c4e35986692a0c40abca9 |
long_lat |
ENVELOPE(15.865,15.865,76.979,76.979) |
geographic |
Arctic Svalbard Hornsund |
geographic_facet |
Arctic Svalbard Hornsund |
genre |
Arctic Calanus finmarchicus Calanus glacialis Hornsund Kongsfjord* Kongsfjorden little auk Svalbard Zooplankton Spitsbergen |
genre_facet |
Arctic Calanus finmarchicus Calanus glacialis Hornsund Kongsfjord* Kongsfjorden little auk Svalbard Zooplankton Spitsbergen |
op_source |
Water, Vol 11, Iss 7, p 1405 (2019) |
op_relation |
https://www.mdpi.com/2073-4441/11/7/1405 https://doaj.org/toc/2073-4441 2073-4441 doi:10.3390/w11071405 https://doaj.org/article/21fb96ff003c4e35986692a0c40abca9 |
op_doi |
https://doi.org/10.3390/w11071405 |
container_title |
Water |
container_volume |
11 |
container_issue |
7 |
container_start_page |
1405 |
_version_ |
1766343320220467200 |