Protist communities along freshwater–marine transition zones in Hudson Bay (Canada)
International audience One of the most striking ecological divides on Earth is between marine and nearby freshwater environments, as relatively few taxa can move between the two. Microbial eukaryotes contribute to biogeochemical and energy cycling in both fresh and marine waters, with little species...
Published in: | Elementa: Science of the Anthropocene |
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Online Access: | https://hal.science/hal-03333763 https://hal.science/hal-03333763/document https://hal.science/hal-03333763/file/elementa.2021.00111.pdf https://doi.org/10.1525/elementa.2021.00111 |
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ftunivnantes:oai:HAL:hal-03333763v1 2023-05-15T14:51:58+02:00 Protist communities along freshwater–marine transition zones in Hudson Bay (Canada) Jacquemot, Loïc Kalenitchenko, Dimitri Matthes, Lisa, Vigneron, Adrien Mundy, Christopher, Tremblay, Jean-Éric Lovejoy, Connie Université Laval Québec (ULaval) The Arctic University of Norway Tromsø, Norway (UiT) 2021-09-03 https://hal.science/hal-03333763 https://hal.science/hal-03333763/document https://hal.science/hal-03333763/file/elementa.2021.00111.pdf https://doi.org/10.1525/elementa.2021.00111 en eng HAL CCSD University of California Press info:eu-repo/semantics/altIdentifier/doi/10.1525/elementa.2021.00111 hal-03333763 https://hal.science/hal-03333763 https://hal.science/hal-03333763/document https://hal.science/hal-03333763/file/elementa.2021.00111.pdf doi:10.1525/elementa.2021.00111 info:eu-repo/semantics/OpenAccess EISSN: 2325-1026 Elementa: Science of the Anthropocene https://hal.science/hal-03333763 Elementa: Science of the Anthropocene, 2021, 9, ⟨10.1525/elementa.2021.00111⟩ Microbial eukaryotes Arctic Ocean Hudson Bay Estuary Freshwater gradient Maximum turbidity zone [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2021 ftunivnantes https://doi.org/10.1525/elementa.2021.00111 2023-01-18T00:25:06Z International audience One of the most striking ecological divides on Earth is between marine and nearby freshwater environments, as relatively few taxa can move between the two. Microbial eukaryotes contribute to biogeochemical and energy cycling in both fresh and marine waters, with little species overlap between the two ecosystems. Arctic and sub-Arctic marine systems are relatively fresh compared to tropical and temperate systems, but details of microbial eukaryote communities along river-to-sea transitions are poorly known. To bridge this knowledge gap, we investigated three river-to-sea transitions (Nelson, Churchill, and Great Whale Rivers) in sub-Arctic Hudson Bay through 18S rRNA amplicon sequencing to identify microbial eukaryotes along the salinity and biogeochemical gradients. Salinity acted as the principal dispersal barrier preventing freshwater microorganisms from colonizing marine coastal waters, with microbial eukaryote communities of the three rivers clustering together. Just offshore, communities clustered by coastal regions associated with nutrient concentrations. Analysis of indicator species revealed that communities in the nitrate-depleted coastal water off the Churchill and Great Whale Rivers were dominated by heterotrophic taxa and small photosynthetic protists. In contrast, the Nelson offshore community was characterized by a high proportion of the diatom Rhizosolenia. A distinct community of heterotrophic protists was identified in the three estuarine transition zones, suggesting specialized estuarine communities. Such specialization was most marked in the Nelson River system that was sampled more intensely and showed estuarine circulation.The autochthonous community was composed of the bacterial grazers Katablepharis, Mataza, and Cryothecomonas, as well as brackish species of the diatoms Skeletonema and Thalassiosira. These findings suggest that flow regulation on the Nelson River that modifies estuarine circulation would affect estuarine community composition and distribution in ... Article in Journal/Newspaper Arctic Arctic Ocean Hudson Bay Université de Nantes: HAL-UNIV-NANTES Arctic Arctic Ocean Canada Hudson Hudson Bay Elementa: Science of the Anthropocene 9 1 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Microbial eukaryotes Arctic Ocean Hudson Bay Estuary Freshwater gradient Maximum turbidity zone [SDE]Environmental Sciences |
spellingShingle |
Microbial eukaryotes Arctic Ocean Hudson Bay Estuary Freshwater gradient Maximum turbidity zone [SDE]Environmental Sciences Jacquemot, Loïc Kalenitchenko, Dimitri Matthes, Lisa, Vigneron, Adrien Mundy, Christopher, Tremblay, Jean-Éric Lovejoy, Connie Protist communities along freshwater–marine transition zones in Hudson Bay (Canada) |
topic_facet |
Microbial eukaryotes Arctic Ocean Hudson Bay Estuary Freshwater gradient Maximum turbidity zone [SDE]Environmental Sciences |
description |
International audience One of the most striking ecological divides on Earth is between marine and nearby freshwater environments, as relatively few taxa can move between the two. Microbial eukaryotes contribute to biogeochemical and energy cycling in both fresh and marine waters, with little species overlap between the two ecosystems. Arctic and sub-Arctic marine systems are relatively fresh compared to tropical and temperate systems, but details of microbial eukaryote communities along river-to-sea transitions are poorly known. To bridge this knowledge gap, we investigated three river-to-sea transitions (Nelson, Churchill, and Great Whale Rivers) in sub-Arctic Hudson Bay through 18S rRNA amplicon sequencing to identify microbial eukaryotes along the salinity and biogeochemical gradients. Salinity acted as the principal dispersal barrier preventing freshwater microorganisms from colonizing marine coastal waters, with microbial eukaryote communities of the three rivers clustering together. Just offshore, communities clustered by coastal regions associated with nutrient concentrations. Analysis of indicator species revealed that communities in the nitrate-depleted coastal water off the Churchill and Great Whale Rivers were dominated by heterotrophic taxa and small photosynthetic protists. In contrast, the Nelson offshore community was characterized by a high proportion of the diatom Rhizosolenia. A distinct community of heterotrophic protists was identified in the three estuarine transition zones, suggesting specialized estuarine communities. Such specialization was most marked in the Nelson River system that was sampled more intensely and showed estuarine circulation.The autochthonous community was composed of the bacterial grazers Katablepharis, Mataza, and Cryothecomonas, as well as brackish species of the diatoms Skeletonema and Thalassiosira. These findings suggest that flow regulation on the Nelson River that modifies estuarine circulation would affect estuarine community composition and distribution in ... |
author2 |
Université Laval Québec (ULaval) The Arctic University of Norway Tromsø, Norway (UiT) |
format |
Article in Journal/Newspaper |
author |
Jacquemot, Loïc Kalenitchenko, Dimitri Matthes, Lisa, Vigneron, Adrien Mundy, Christopher, Tremblay, Jean-Éric Lovejoy, Connie |
author_facet |
Jacquemot, Loïc Kalenitchenko, Dimitri Matthes, Lisa, Vigneron, Adrien Mundy, Christopher, Tremblay, Jean-Éric Lovejoy, Connie |
author_sort |
Jacquemot, Loïc |
title |
Protist communities along freshwater–marine transition zones in Hudson Bay (Canada) |
title_short |
Protist communities along freshwater–marine transition zones in Hudson Bay (Canada) |
title_full |
Protist communities along freshwater–marine transition zones in Hudson Bay (Canada) |
title_fullStr |
Protist communities along freshwater–marine transition zones in Hudson Bay (Canada) |
title_full_unstemmed |
Protist communities along freshwater–marine transition zones in Hudson Bay (Canada) |
title_sort |
protist communities along freshwater–marine transition zones in hudson bay (canada) |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03333763 https://hal.science/hal-03333763/document https://hal.science/hal-03333763/file/elementa.2021.00111.pdf https://doi.org/10.1525/elementa.2021.00111 |
geographic |
Arctic Arctic Ocean Canada Hudson Hudson Bay |
geographic_facet |
Arctic Arctic Ocean Canada Hudson Hudson Bay |
genre |
Arctic Arctic Ocean Hudson Bay |
genre_facet |
Arctic Arctic Ocean Hudson Bay |
op_source |
EISSN: 2325-1026 Elementa: Science of the Anthropocene https://hal.science/hal-03333763 Elementa: Science of the Anthropocene, 2021, 9, ⟨10.1525/elementa.2021.00111⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1525/elementa.2021.00111 hal-03333763 https://hal.science/hal-03333763 https://hal.science/hal-03333763/document https://hal.science/hal-03333763/file/elementa.2021.00111.pdf doi:10.1525/elementa.2021.00111 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1525/elementa.2021.00111 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
9 |
container_issue |
1 |
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1766323098089422848 |