Biogeochemical controls on the bacterial population in the eastern Atlantic Ocean
Little is known about bacterial dynamics in the oligotrophic ocean, particularly about cultivable bacteria. We examined the abundance of total and cultivable bacteria in relation to changes in biogeochemical conditions in the eastern Atlantic Ocean with special regard to Vibrio spp., a group of bact...
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Atlantic oligotrophic DOC-Iron bacteria Oceanografía Hidrología Recursos Hídricos Ciencias de la Tierra y relacionadas con el Medio Ambiente CIENCIAS NATURALES Y EXACTAS |
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Atlantic oligotrophic DOC-Iron bacteria Oceanografía Hidrología Recursos Hídricos Ciencias de la Tierra y relacionadas con el Medio Ambiente CIENCIAS NATURALES Y EXACTAS Neogi, Sucharit Basu Koch, Boris Peter Schmitt Kopplin, Philippe Pohl, Christine Kattner, Gerhard Yamasaki, Shintaro Lara, Ruben Jose Biogeochemical controls on the bacterial population in the eastern Atlantic Ocean |
topic_facet |
Atlantic oligotrophic DOC-Iron bacteria Oceanografía Hidrología Recursos Hídricos Ciencias de la Tierra y relacionadas con el Medio Ambiente CIENCIAS NATURALES Y EXACTAS |
description |
Little is known about bacterial dynamics in the oligotrophic ocean, particularly about cultivable bacteria. We examined the abundance of total and cultivable bacteria in relation to changes in biogeochemical conditions in the eastern Atlantic Ocean with special regard to Vibrio spp., a group of bacteria that can cause diseases in human and aquatic organisms. Surface, deep water and plankton (<20 µm, 20– 55 µm and >55 µm) samples were collected between 50◦ N and 24◦ S. Chlorophyll-a was very low (<0.3 µg l−1 ) in most areas of the nutrient-poor Atlantic, except at a few locations near upwelling regions. In surface water, dissolved organic carbon (DOC) and nitrogen (DON) concentrations were 64– 95 µM C and 2–10 µM N accounting for ≥90 % and ≥76 % of total organic C and N, respectively. DOC and DON gradually decreased to ∼45 µM C and <5 µM N in the bottom water. In the surface layer, culture independent total bacteria and other prokaryotes represented by 40 -6-diamidino- 2-phenylindole (DAPI) counts, ranged mostly between 107 and 108 cells l−1 , while cultivable bacterial counts (CBC) and Vibrio spp. were found at concentrations of 104–107 and 102–105 colony forming units (CFU) l−1 , respectively. Most bacteria (>99 %) were found in the nanoplankton fraction (<20 µm), however, bacterial abundance did not correlate with suspended particulates (chlorophyll-a, particulate organic C [POC] and N [PON]). Instead, we found a highly significant correlation between bacterial abundance and temperature (p < 0.001) and a significant correlation with DOC and DON (p < 0.005 and < 0.01, respectively). In comparison to CBC and DAPI-stained prokaryotes, cultivable Vibrio showed a stronger and highly significant correlation with DOC and DON (p < 0.0005 and p < 0.005, respectively). In cold waters of the mesopelagic and abyssal zones, CBC was 50 to 100-times lower than in the surface layer; however, cultivable Vibrio spp. could be isolated from the bathypelagic zone and even near the seafloor (average ∼10 CFU l−1 ). The depth-wise decrease in CBC and Vibrio coincided with the decrease in both DOC and POC. Our study indicates that Vibrio and other bacteria may largely depend on dissolved organic matter to survive in nutrient-poor oceanic habitats. Fil: Neogi, Sucharit Basu. Osaka Prefecture University; Japón. International Centre for Diarrhoeal Disease Research; Bangladesh Fil: Koch, Boris Peter. Alfred Wegener Institute for Polar and Marine Research; Alemania. University of Applied Sciences; Alemania Fil: Schmitt Kopplin, Philippe. Helmholtz Zentrum Munchen; Alemania Fil: Pohl, Christine. Leibniz Institute for Baltic Sea Research; Alemania Fil: Kattner, Gerhard. Alfred Wegener Institute for Polar and Marine Research; Alemania Fil: Yamasaki, Shintaro. Osaka Prefecture University; Japón Fil: Lara, Ruben Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; Argentina. Leibniz Centre for Tropical Marine Ecology GmbH; Alemania |
format |
Article in Journal/Newspaper |
author |
Neogi, Sucharit Basu Koch, Boris Peter Schmitt Kopplin, Philippe Pohl, Christine Kattner, Gerhard Yamasaki, Shintaro Lara, Ruben Jose |
author_facet |
Neogi, Sucharit Basu Koch, Boris Peter Schmitt Kopplin, Philippe Pohl, Christine Kattner, Gerhard Yamasaki, Shintaro Lara, Ruben Jose |
author_sort |
Neogi, Sucharit Basu |
title |
Biogeochemical controls on the bacterial population in the eastern Atlantic Ocean |
title_short |
Biogeochemical controls on the bacterial population in the eastern Atlantic Ocean |
title_full |
Biogeochemical controls on the bacterial population in the eastern Atlantic Ocean |
title_fullStr |
Biogeochemical controls on the bacterial population in the eastern Atlantic Ocean |
title_full_unstemmed |
Biogeochemical controls on the bacterial population in the eastern Atlantic Ocean |
title_sort |
biogeochemical controls on the bacterial population in the eastern atlantic ocean |
publisher |
Copernicus Publications |
url |
http://hdl.handle.net/11336/22291 |
geographic |
Argentina Argentino |
geographic_facet |
Argentina Argentino |
genre |
Alfred Wegener Institute |
genre_facet |
Alfred Wegener Institute |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-8-3747-2011 info:eu-repo/semantics/altIdentifier/url/https://www.biogeosciences.net/8/3747/2011/ Neogi, Sucharit Basu; Koch, Boris Peter; Schmitt Kopplin, Philippe; Pohl, Christine; Kattner, Gerhard; et al.; Biogeochemical controls on the bacterial population in the eastern Atlantic Ocean; Copernicus Publications; Biogeosciences; 8; 7-2011; 3747-3759 1726-4170 http://hdl.handle.net/11336/22291 1726-4189 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/2.5/ar/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-8-3747-2011 |
container_title |
Biogeosciences |
container_volume |
8 |
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12 |
container_start_page |
3747 |
op_container_end_page |
3759 |
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1766270792021049344 |
spelling |
ftconicet:oai:ri.conicet.gov.ar:11336/22291 2023-05-15T13:15:44+02:00 Biogeochemical controls on the bacterial population in the eastern Atlantic Ocean Neogi, Sucharit Basu Koch, Boris Peter Schmitt Kopplin, Philippe Pohl, Christine Kattner, Gerhard Yamasaki, Shintaro Lara, Ruben Jose application/pdf http://hdl.handle.net/11336/22291 eng eng Copernicus Publications info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-8-3747-2011 info:eu-repo/semantics/altIdentifier/url/https://www.biogeosciences.net/8/3747/2011/ Neogi, Sucharit Basu; Koch, Boris Peter; Schmitt Kopplin, Philippe; Pohl, Christine; Kattner, Gerhard; et al.; Biogeochemical controls on the bacterial population in the eastern Atlantic Ocean; Copernicus Publications; Biogeosciences; 8; 7-2011; 3747-3759 1726-4170 http://hdl.handle.net/11336/22291 1726-4189 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/2.5/ar/ CC-BY Atlantic oligotrophic DOC-Iron bacteria Oceanografía Hidrología Recursos Hídricos Ciencias de la Tierra y relacionadas con el Medio Ambiente CIENCIAS NATURALES Y EXACTAS info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.5194/bg-8-3747-2011 2019-08-31T16:28:55Z Little is known about bacterial dynamics in the oligotrophic ocean, particularly about cultivable bacteria. We examined the abundance of total and cultivable bacteria in relation to changes in biogeochemical conditions in the eastern Atlantic Ocean with special regard to Vibrio spp., a group of bacteria that can cause diseases in human and aquatic organisms. Surface, deep water and plankton (<20 µm, 20– 55 µm and >55 µm) samples were collected between 50◦ N and 24◦ S. Chlorophyll-a was very low (<0.3 µg l−1 ) in most areas of the nutrient-poor Atlantic, except at a few locations near upwelling regions. In surface water, dissolved organic carbon (DOC) and nitrogen (DON) concentrations were 64– 95 µM C and 2–10 µM N accounting for ≥90 % and ≥76 % of total organic C and N, respectively. DOC and DON gradually decreased to ∼45 µM C and <5 µM N in the bottom water. In the surface layer, culture independent total bacteria and other prokaryotes represented by 40 -6-diamidino- 2-phenylindole (DAPI) counts, ranged mostly between 107 and 108 cells l−1 , while cultivable bacterial counts (CBC) and Vibrio spp. were found at concentrations of 104–107 and 102–105 colony forming units (CFU) l−1 , respectively. Most bacteria (>99 %) were found in the nanoplankton fraction (<20 µm), however, bacterial abundance did not correlate with suspended particulates (chlorophyll-a, particulate organic C [POC] and N [PON]). Instead, we found a highly significant correlation between bacterial abundance and temperature (p < 0.001) and a significant correlation with DOC and DON (p < 0.005 and < 0.01, respectively). In comparison to CBC and DAPI-stained prokaryotes, cultivable Vibrio showed a stronger and highly significant correlation with DOC and DON (p < 0.0005 and p < 0.005, respectively). In cold waters of the mesopelagic and abyssal zones, CBC was 50 to 100-times lower than in the surface layer; however, cultivable Vibrio spp. could be isolated from the bathypelagic zone and even near the seafloor (average ∼10 CFU l−1 ). The depth-wise decrease in CBC and Vibrio coincided with the decrease in both DOC and POC. Our study indicates that Vibrio and other bacteria may largely depend on dissolved organic matter to survive in nutrient-poor oceanic habitats. Fil: Neogi, Sucharit Basu. Osaka Prefecture University; Japón. International Centre for Diarrhoeal Disease Research; Bangladesh Fil: Koch, Boris Peter. Alfred Wegener Institute for Polar and Marine Research; Alemania. University of Applied Sciences; Alemania Fil: Schmitt Kopplin, Philippe. Helmholtz Zentrum Munchen; Alemania Fil: Pohl, Christine. Leibniz Institute for Baltic Sea Research; Alemania Fil: Kattner, Gerhard. Alfred Wegener Institute for Polar and Marine Research; Alemania Fil: Yamasaki, Shintaro. Osaka Prefecture University; Japón Fil: Lara, Ruben Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; Argentina. Leibniz Centre for Tropical Marine Ecology GmbH; Alemania Article in Journal/Newspaper Alfred Wegener Institute CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Argentina Argentino Biogeosciences 8 12 3747 3759 |