Cargando…

Seasonal dynamics and life histories of three sympatric species of Pseudocalanus in two Svalbard fjords

Small copepods are the most diverse and numerous group in high-latitude zooplankton, yet our knowledge of important species remains poor because of the difficulties involved in correct species identification. In this study, we use a molecular method of identification, a species-specific polymerase c...

Descripción completa

Detalles Bibliográficos
Autores principales: Ershova, Elizaveta A, Nyeggen, Margot U, Yurikova, Daria A, Søreide, Janne E
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8355481/
https://www.ncbi.nlm.nih.gov/pubmed/34385887
http://dx.doi.org/10.1093/plankt/fbab007
_version_ 1783736769328447488
author Ershova, Elizaveta A
Nyeggen, Margot U
Yurikova, Daria A
Søreide, Janne E
author_facet Ershova, Elizaveta A
Nyeggen, Margot U
Yurikova, Daria A
Søreide, Janne E
author_sort Ershova, Elizaveta A
collection PubMed
description Small copepods are the most diverse and numerous group in high-latitude zooplankton, yet our knowledge of important species remains poor because of the difficulties involved in correct species identification. In this study, we use a molecular method of identification, a species-specific polymerase chain reaction, to provide the first description of the seasonal dynamics and life histories of the important genus Pseudocalanus in two Svalbard fjords with contrasting environments. We conducted monthly investigations in the relatively warm and ice-free Adventfjorden, supplemented with seasonal samples from the colder, seasonally ice-covered Billefjorden. We found three species of Pseudocalanus (the Arctic P. acuspes and P. minutus, and the boreal P. moultoni). Pseudocalanus acuspes had a distinct annual life cycle and dominated during summer, when it actively reproduced. Surprisingly, the boreal P. moultoni was present year-round in both fjords and was the dominant species during winter; the presence of all life stages of this species throughout the year suggests a more continuous reproduction. The Arctic P. minutus was the rarest of the three species and was likely able to complete its life cycle in Billefjorden but not in Adventfjorden. Our study demonstrates that closely related species may have different life strategies and environmental preferences, which presumably make high-latitude zooplankton communities more resilient to climate change impacts on genus but not necessarily on species level.
format Online
Article
Text
id pubmed-8355481
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher Oxford University Press
record_format MEDLINE/PubMed
spelling pubmed-83554812021-08-11 Seasonal dynamics and life histories of three sympatric species of Pseudocalanus in two Svalbard fjords Ershova, Elizaveta A Nyeggen, Margot U Yurikova, Daria A Søreide, Janne E J Plankton Res Original Article Small copepods are the most diverse and numerous group in high-latitude zooplankton, yet our knowledge of important species remains poor because of the difficulties involved in correct species identification. In this study, we use a molecular method of identification, a species-specific polymerase chain reaction, to provide the first description of the seasonal dynamics and life histories of the important genus Pseudocalanus in two Svalbard fjords with contrasting environments. We conducted monthly investigations in the relatively warm and ice-free Adventfjorden, supplemented with seasonal samples from the colder, seasonally ice-covered Billefjorden. We found three species of Pseudocalanus (the Arctic P. acuspes and P. minutus, and the boreal P. moultoni). Pseudocalanus acuspes had a distinct annual life cycle and dominated during summer, when it actively reproduced. Surprisingly, the boreal P. moultoni was present year-round in both fjords and was the dominant species during winter; the presence of all life stages of this species throughout the year suggests a more continuous reproduction. The Arctic P. minutus was the rarest of the three species and was likely able to complete its life cycle in Billefjorden but not in Adventfjorden. Our study demonstrates that closely related species may have different life strategies and environmental preferences, which presumably make high-latitude zooplankton communities more resilient to climate change impacts on genus but not necessarily on species level. Oxford University Press 2021-03-10 /pmc/articles/PMC8355481/ /pubmed/34385887 http://dx.doi.org/10.1093/plankt/fbab007 Text en © The Author(s) 2021. Published by Oxford University Press. https://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) ), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Ershova, Elizaveta A
Nyeggen, Margot U
Yurikova, Daria A
Søreide, Janne E
Seasonal dynamics and life histories of three sympatric species of Pseudocalanus in two Svalbard fjords
title Seasonal dynamics and life histories of three sympatric species of Pseudocalanus in two Svalbard fjords
title_full Seasonal dynamics and life histories of three sympatric species of Pseudocalanus in two Svalbard fjords
title_fullStr Seasonal dynamics and life histories of three sympatric species of Pseudocalanus in two Svalbard fjords
title_full_unstemmed Seasonal dynamics and life histories of three sympatric species of Pseudocalanus in two Svalbard fjords
title_short Seasonal dynamics and life histories of three sympatric species of Pseudocalanus in two Svalbard fjords
title_sort seasonal dynamics and life histories of three sympatric species of pseudocalanus in two svalbard fjords
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8355481/
https://www.ncbi.nlm.nih.gov/pubmed/34385887
http://dx.doi.org/10.1093/plankt/fbab007
work_keys_str_mv AT ershovaelizavetaa seasonaldynamicsandlifehistoriesofthreesympatricspeciesofpseudocalanusintwosvalbardfjords
AT nyeggenmargotu seasonaldynamicsandlifehistoriesofthreesympatricspeciesofpseudocalanusintwosvalbardfjords
AT yurikovadariaa seasonaldynamicsandlifehistoriesofthreesympatricspeciesofpseudocalanusintwosvalbardfjords
AT søreidejannee seasonaldynamicsandlifehistoriesofthreesympatricspeciesofpseudocalanusintwosvalbardfjords