Seasonal phenology of four dominant copepods in the Pacific sector of the Arctic Ocean: Insights from statistical analyses of sediment trap data
In recent years, marine ecosystems have changed due to the drastic sea ice reduction in the Arctic Ocean, but the relationship between copepod phenology and environmental drivers is unclear. To reveal the relationship, seasonal changes in the flux (abundance of swimmers), population structure, lipid...
Published in: | Polar Science |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
|
Subjects: | |
Online Access: | http://hdl.handle.net/2115/80535 https://doi.org/10.1016/j.polar.2018.08.006 |
id |
fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/80535 |
---|---|
record_format |
openpolar |
spelling |
fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/80535 2023-05-15T14:51:58+02:00 Seasonal phenology of four dominant copepods in the Pacific sector of the Arctic Ocean: Insights from statistical analyses of sediment trap data Tokuhiro, Koki Abe, Yoshiyuki Matsuno, Kohei Onodera, Jonaotaro Fujiwara, Amane Harada, Naomi Hirawake, Toru Yamaguchi, Atsushi http://hdl.handle.net/2115/80535 https://doi.org/10.1016/j.polar.2018.08.006 eng eng Elsevier http://hdl.handle.net/2115/80535 Polar Science, 19: 94-111 http://dx.doi.org/10.1016/j.polar.2018.08.006 © 2019, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ http://creativecommons.org/licenses/by-nc-nd/4.0/ CC-BY-NC-ND Generalized additive models Calanus hyperboreus Metridia longa Paraeuchaeta glacialis Heterorhabdus norvegicus 660 article (author version) fthokunivhus https://doi.org/10.1016/j.polar.2018.08.006 2022-11-18T01:05:19Z In recent years, marine ecosystems have changed due to the drastic sea ice reduction in the Arctic Ocean, but the relationship between copepod phenology and environmental drivers is unclear. To reveal the relationship, seasonal changes in the flux (abundance of swimmers), population structure, lipid accumulation and gonad maturation of four dominant copepods (Calanus hyperboreus, Metridia longa, Paraeuchaeta glacialis and Heterorhabdus norvegicus) were studied using a sediment trap deployed at a depth of 222 m in the Pacific-Arctic sector from October 2010 to September 2013. C. hyperboreus, mostly comprising copepodid stage 6 females (C6F), exhibited several peaks in flux in spring and autumn. C. hyperboreus C6Fs were dominated by lipid-rich specimens year-round, and gonad development was observed in these samples from February to April. The M. longa flux showed no clear seasonality. Gonad maturation of M. longa C6Fs occurred from February to September. P. glacialis flux exhibited two peaks in autumn of 2011 and 2012. In contrast to the former two species, lipid-rich, mature P. glacialis C6Fs occurred year-round. H. norvegicus copepodid stage 6 males (C6Ms) also occurred throughout the year, likely because H. norvegicus has functional feeding appendages, even in C6Ms. From generalized additive models, C. hyperboreus, M. longa and P. glacialis showed relationships with daytime length and/or sea ice concentrations, but the relationship patterns were different. These findings suggest that the response (e.g., vertical migration) to the environmental parameters could vary with species and the drastic sea ice reductions may affect the copepod phenology in the Pacific-Arctic sector. Article in Journal/Newspaper Arctic Arctic Ocean Calanus hyperboreus Pacific Arctic Polar Science Polar Science Sea ice Copepods Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Arctic Arctic Ocean Pacific Polar Science 19 94 111 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Generalized additive models Calanus hyperboreus Metridia longa Paraeuchaeta glacialis Heterorhabdus norvegicus 660 |
spellingShingle |
Generalized additive models Calanus hyperboreus Metridia longa Paraeuchaeta glacialis Heterorhabdus norvegicus 660 Tokuhiro, Koki Abe, Yoshiyuki Matsuno, Kohei Onodera, Jonaotaro Fujiwara, Amane Harada, Naomi Hirawake, Toru Yamaguchi, Atsushi Seasonal phenology of four dominant copepods in the Pacific sector of the Arctic Ocean: Insights from statistical analyses of sediment trap data |
topic_facet |
Generalized additive models Calanus hyperboreus Metridia longa Paraeuchaeta glacialis Heterorhabdus norvegicus 660 |
description |
In recent years, marine ecosystems have changed due to the drastic sea ice reduction in the Arctic Ocean, but the relationship between copepod phenology and environmental drivers is unclear. To reveal the relationship, seasonal changes in the flux (abundance of swimmers), population structure, lipid accumulation and gonad maturation of four dominant copepods (Calanus hyperboreus, Metridia longa, Paraeuchaeta glacialis and Heterorhabdus norvegicus) were studied using a sediment trap deployed at a depth of 222 m in the Pacific-Arctic sector from October 2010 to September 2013. C. hyperboreus, mostly comprising copepodid stage 6 females (C6F), exhibited several peaks in flux in spring and autumn. C. hyperboreus C6Fs were dominated by lipid-rich specimens year-round, and gonad development was observed in these samples from February to April. The M. longa flux showed no clear seasonality. Gonad maturation of M. longa C6Fs occurred from February to September. P. glacialis flux exhibited two peaks in autumn of 2011 and 2012. In contrast to the former two species, lipid-rich, mature P. glacialis C6Fs occurred year-round. H. norvegicus copepodid stage 6 males (C6Ms) also occurred throughout the year, likely because H. norvegicus has functional feeding appendages, even in C6Ms. From generalized additive models, C. hyperboreus, M. longa and P. glacialis showed relationships with daytime length and/or sea ice concentrations, but the relationship patterns were different. These findings suggest that the response (e.g., vertical migration) to the environmental parameters could vary with species and the drastic sea ice reductions may affect the copepod phenology in the Pacific-Arctic sector. |
format |
Article in Journal/Newspaper |
author |
Tokuhiro, Koki Abe, Yoshiyuki Matsuno, Kohei Onodera, Jonaotaro Fujiwara, Amane Harada, Naomi Hirawake, Toru Yamaguchi, Atsushi |
author_facet |
Tokuhiro, Koki Abe, Yoshiyuki Matsuno, Kohei Onodera, Jonaotaro Fujiwara, Amane Harada, Naomi Hirawake, Toru Yamaguchi, Atsushi |
author_sort |
Tokuhiro, Koki |
title |
Seasonal phenology of four dominant copepods in the Pacific sector of the Arctic Ocean: Insights from statistical analyses of sediment trap data |
title_short |
Seasonal phenology of four dominant copepods in the Pacific sector of the Arctic Ocean: Insights from statistical analyses of sediment trap data |
title_full |
Seasonal phenology of four dominant copepods in the Pacific sector of the Arctic Ocean: Insights from statistical analyses of sediment trap data |
title_fullStr |
Seasonal phenology of four dominant copepods in the Pacific sector of the Arctic Ocean: Insights from statistical analyses of sediment trap data |
title_full_unstemmed |
Seasonal phenology of four dominant copepods in the Pacific sector of the Arctic Ocean: Insights from statistical analyses of sediment trap data |
title_sort |
seasonal phenology of four dominant copepods in the pacific sector of the arctic ocean: insights from statistical analyses of sediment trap data |
publisher |
Elsevier |
url |
http://hdl.handle.net/2115/80535 https://doi.org/10.1016/j.polar.2018.08.006 |
geographic |
Arctic Arctic Ocean Pacific |
geographic_facet |
Arctic Arctic Ocean Pacific |
genre |
Arctic Arctic Ocean Calanus hyperboreus Pacific Arctic Polar Science Polar Science Sea ice Copepods |
genre_facet |
Arctic Arctic Ocean Calanus hyperboreus Pacific Arctic Polar Science Polar Science Sea ice Copepods |
op_relation |
http://hdl.handle.net/2115/80535 Polar Science, 19: 94-111 http://dx.doi.org/10.1016/j.polar.2018.08.006 |
op_rights |
© 2019, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.polar.2018.08.006 |
container_title |
Polar Science |
container_volume |
19 |
container_start_page |
94 |
op_container_end_page |
111 |
_version_ |
1766323101458497536 |