Mixotrophic haptophytes are key bacterial grazers in oligotrophic coastal waters
- Autores
- Unrein, Fernando; Gasol, Josep M.; Not, Fabrice; Forn, Irene; Massana, Ramon
- Año de publicación
- 2013
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Grazing rate estimates indicate that approximately half of the bacterivory in oligotrophic oceans is due to mixotrophic flagellates. However, most estimations have considered algae as a single group. Here we aimed at opening the black-box of the phytoflagellates (PF) <20 µm. Haptophytes, chlorophytes, cryptophytes and pigmented dinoflagellates were identified using fluorescent in situ hybridization or by standard DAPI-staining. Their fluctuations in abundance, cell-size, biomass, and bacterivory rates were measured through an annual cycle in an oligotrophic coastal system. On average, we were able to assign to these groups 37% of the total pico-phytoflagellates and 65% of the nano-phytoflagellates composition. Chlorophytes were mostly picoplanktonic and they never ingested fluorescently labelled bacteria. About 50% of the PF <20 µm biomass was represented by mixotrophic algae. Pigmented dinoflagellates were the least abundant group with little impact on bacterioplankton. Cryptophytes were quantitatively important during the coldest periods and explained about 4% of total bacterivory. Haptophytes were the most important mixotrophic group: (i) they were mostly represented by cells 3-5 µm in size present year-round; (ii) cell-specific grazing rates were comparable to other bacterivorous non-photosynthetic organisms, regardless of the in situ nutrient availability conditions; (iii) this group could acquire a significant portion of their carbon by ingesting bacteria; and (iv) haptophytes explained on average 40% of the bacterivory exerted by mixotrophic flagellates and were responsible for 9-27% of total bacterivory. Our results, when considered alongside the widespread distribution of haptophytes in the ocean, indicate that they play a key role as bacterivores in marine ecosystems.
Fil: Unrein, Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús). Universidad Nacional de San Martín. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús); Argentina. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; España
Fil: Gasol, Josep M.. Universite Pierre et Marie Curie; Francia. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; España
Fil: Not, Fabrice. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; España
Fil: Forn, Irene. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; España
Fil: Massana, Ramon. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; España - Materia
-
Mixotrophic
Haptophytes
Cryptophytes
Oligotrophic Coastal Seawater - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/24628
Ver los metadatos del registro completo
id |
CONICETDig_8b0792bd37b8c8d175e0bfca01736efb |
---|---|
oai_identifier_str |
oai:ri.conicet.gov.ar:11336/24628 |
network_acronym_str |
CONICETDig |
repository_id_str |
3498 |
network_name_str |
CONICET Digital (CONICET) |
spelling |
Mixotrophic haptophytes are key bacterial grazers in oligotrophic coastal watersUnrein, FernandoGasol, Josep M.Not, FabriceForn, IreneMassana, RamonMixotrophicHaptophytesCryptophytesOligotrophic Coastal Seawaterhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Grazing rate estimates indicate that approximately half of the bacterivory in oligotrophic oceans is due to mixotrophic flagellates. However, most estimations have considered algae as a single group. Here we aimed at opening the black-box of the phytoflagellates (PF) <20 µm. Haptophytes, chlorophytes, cryptophytes and pigmented dinoflagellates were identified using fluorescent in situ hybridization or by standard DAPI-staining. Their fluctuations in abundance, cell-size, biomass, and bacterivory rates were measured through an annual cycle in an oligotrophic coastal system. On average, we were able to assign to these groups 37% of the total pico-phytoflagellates and 65% of the nano-phytoflagellates composition. Chlorophytes were mostly picoplanktonic and they never ingested fluorescently labelled bacteria. About 50% of the PF <20 µm biomass was represented by mixotrophic algae. Pigmented dinoflagellates were the least abundant group with little impact on bacterioplankton. Cryptophytes were quantitatively important during the coldest periods and explained about 4% of total bacterivory. Haptophytes were the most important mixotrophic group: (i) they were mostly represented by cells 3-5 µm in size present year-round; (ii) cell-specific grazing rates were comparable to other bacterivorous non-photosynthetic organisms, regardless of the in situ nutrient availability conditions; (iii) this group could acquire a significant portion of their carbon by ingesting bacteria; and (iv) haptophytes explained on average 40% of the bacterivory exerted by mixotrophic flagellates and were responsible for 9-27% of total bacterivory. Our results, when considered alongside the widespread distribution of haptophytes in the ocean, indicate that they play a key role as bacterivores in marine ecosystems.Fil: Unrein, Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús). Universidad Nacional de San Martín. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús); Argentina. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; EspañaFil: Gasol, Josep M.. Universite Pierre et Marie Curie; Francia. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; EspañaFil: Not, Fabrice. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; EspañaFil: Forn, Irene. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; EspañaFil: Massana, Ramon. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; EspañaNature Publishing Group2013-08-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/24628Unrein, Fernando; Gasol, Josep M.; Not, Fabrice; Forn, Irene; Massana, Ramon; Mixotrophic haptophytes are key bacterial grazers in oligotrophic coastal waters; Nature Publishing Group; Isme Journal; 8; 8-8-2013; 164-1761751-7362CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1038/ismej.2013.132info:eu-repo/semantics/altIdentifier/url/https://www.nature.com/ismej/journal/v8/n1/full/ismej2013132a.htmlinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:53:15Zoai:ri.conicet.gov.ar:11336/24628instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:53:16.042CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Mixotrophic haptophytes are key bacterial grazers in oligotrophic coastal waters |
title |
Mixotrophic haptophytes are key bacterial grazers in oligotrophic coastal waters |
spellingShingle |
Mixotrophic haptophytes are key bacterial grazers in oligotrophic coastal waters Unrein, Fernando Mixotrophic Haptophytes Cryptophytes Oligotrophic Coastal Seawater |
title_short |
Mixotrophic haptophytes are key bacterial grazers in oligotrophic coastal waters |
title_full |
Mixotrophic haptophytes are key bacterial grazers in oligotrophic coastal waters |
title_fullStr |
Mixotrophic haptophytes are key bacterial grazers in oligotrophic coastal waters |
title_full_unstemmed |
Mixotrophic haptophytes are key bacterial grazers in oligotrophic coastal waters |
title_sort |
Mixotrophic haptophytes are key bacterial grazers in oligotrophic coastal waters |
dc.creator.none.fl_str_mv |
Unrein, Fernando Gasol, Josep M. Not, Fabrice Forn, Irene Massana, Ramon |
author |
Unrein, Fernando |
author_facet |
Unrein, Fernando Gasol, Josep M. Not, Fabrice Forn, Irene Massana, Ramon |
author_role |
author |
author2 |
Gasol, Josep M. Not, Fabrice Forn, Irene Massana, Ramon |
author2_role |
author author author author |
dc.subject.none.fl_str_mv |
Mixotrophic Haptophytes Cryptophytes Oligotrophic Coastal Seawater |
topic |
Mixotrophic Haptophytes Cryptophytes Oligotrophic Coastal Seawater |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Grazing rate estimates indicate that approximately half of the bacterivory in oligotrophic oceans is due to mixotrophic flagellates. However, most estimations have considered algae as a single group. Here we aimed at opening the black-box of the phytoflagellates (PF) <20 µm. Haptophytes, chlorophytes, cryptophytes and pigmented dinoflagellates were identified using fluorescent in situ hybridization or by standard DAPI-staining. Their fluctuations in abundance, cell-size, biomass, and bacterivory rates were measured through an annual cycle in an oligotrophic coastal system. On average, we were able to assign to these groups 37% of the total pico-phytoflagellates and 65% of the nano-phytoflagellates composition. Chlorophytes were mostly picoplanktonic and they never ingested fluorescently labelled bacteria. About 50% of the PF <20 µm biomass was represented by mixotrophic algae. Pigmented dinoflagellates were the least abundant group with little impact on bacterioplankton. Cryptophytes were quantitatively important during the coldest periods and explained about 4% of total bacterivory. Haptophytes were the most important mixotrophic group: (i) they were mostly represented by cells 3-5 µm in size present year-round; (ii) cell-specific grazing rates were comparable to other bacterivorous non-photosynthetic organisms, regardless of the in situ nutrient availability conditions; (iii) this group could acquire a significant portion of their carbon by ingesting bacteria; and (iv) haptophytes explained on average 40% of the bacterivory exerted by mixotrophic flagellates and were responsible for 9-27% of total bacterivory. Our results, when considered alongside the widespread distribution of haptophytes in the ocean, indicate that they play a key role as bacterivores in marine ecosystems. Fil: Unrein, Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús). Universidad Nacional de San Martín. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús); Argentina. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; España Fil: Gasol, Josep M.. Universite Pierre et Marie Curie; Francia. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; España Fil: Not, Fabrice. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; España Fil: Forn, Irene. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; España Fil: Massana, Ramon. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; España |
description |
Grazing rate estimates indicate that approximately half of the bacterivory in oligotrophic oceans is due to mixotrophic flagellates. However, most estimations have considered algae as a single group. Here we aimed at opening the black-box of the phytoflagellates (PF) <20 µm. Haptophytes, chlorophytes, cryptophytes and pigmented dinoflagellates were identified using fluorescent in situ hybridization or by standard DAPI-staining. Their fluctuations in abundance, cell-size, biomass, and bacterivory rates were measured through an annual cycle in an oligotrophic coastal system. On average, we were able to assign to these groups 37% of the total pico-phytoflagellates and 65% of the nano-phytoflagellates composition. Chlorophytes were mostly picoplanktonic and they never ingested fluorescently labelled bacteria. About 50% of the PF <20 µm biomass was represented by mixotrophic algae. Pigmented dinoflagellates were the least abundant group with little impact on bacterioplankton. Cryptophytes were quantitatively important during the coldest periods and explained about 4% of total bacterivory. Haptophytes were the most important mixotrophic group: (i) they were mostly represented by cells 3-5 µm in size present year-round; (ii) cell-specific grazing rates were comparable to other bacterivorous non-photosynthetic organisms, regardless of the in situ nutrient availability conditions; (iii) this group could acquire a significant portion of their carbon by ingesting bacteria; and (iv) haptophytes explained on average 40% of the bacterivory exerted by mixotrophic flagellates and were responsible for 9-27% of total bacterivory. Our results, when considered alongside the widespread distribution of haptophytes in the ocean, indicate that they play a key role as bacterivores in marine ecosystems. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-08-08 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/24628 Unrein, Fernando; Gasol, Josep M.; Not, Fabrice; Forn, Irene; Massana, Ramon; Mixotrophic haptophytes are key bacterial grazers in oligotrophic coastal waters; Nature Publishing Group; Isme Journal; 8; 8-8-2013; 164-176 1751-7362 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/24628 |
identifier_str_mv |
Unrein, Fernando; Gasol, Josep M.; Not, Fabrice; Forn, Irene; Massana, Ramon; Mixotrophic haptophytes are key bacterial grazers in oligotrophic coastal waters; Nature Publishing Group; Isme Journal; 8; 8-8-2013; 164-176 1751-7362 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.1038/ismej.2013.132 info:eu-repo/semantics/altIdentifier/url/https://www.nature.com/ismej/journal/v8/n1/full/ismej2013132a.html |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Nature Publishing Group |
publisher.none.fl_str_mv |
Nature Publishing Group |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
reponame_str |
CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
_version_ |
1844613628965158912 |
score |
13.070432 |