Contrasting ecological regimes of microbial plankton along beagle channel and burdwood bank in sub-antarctic waters

dc.creatorGuinder, Valeria Ana
dc.creatorMalits, Andrea
dc.creatorFerronato, Carola
dc.creatorKrock, Bernd
dc.creatorGarzon Cardona, John Edison
dc.creatorMartinez, Ana M.
dc.date2019
dc.date.accessioned2023-08-30T23:49:03Z
dc.date.available2023-08-30T23:49:03Z
dc.identifierhttp://hdl.handle.net/11336/197091
dc.identifierContrasting ecological regimes of microbial plankton along beagle channel and burdwood bank in sub-antarctic waters; XVIII Congreso Latinoamericano de Ciencias del Mar; Argentina; 2019; 1-1
dc.identifierCONICET Digital
dc.identifierCONICET
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8542812
dc.descriptionMarine microbial plankton hold high structuraland functional diversity, however, high-resolution data are lacking in a largepart of the Global Ocean. The Burdwood Bank (BB) hosts rich benthicbiodiversity in low chlorophyll waters of the southern Patagonian Shelf,Argentina. So far, the microorganisms that sustain the productivity over thebank have not been described. During austral summer 2016, we assessed themicrobial plankton (0.2-200 µm cell size) diversity and biomass along alongitudinal transect (54.2-55.3°S, 58-68°W) from the Beagle Channel (BC) tothe BB, characterized by contrasting hydrography. Results displayed a markedzonation in the composition and structure of the microbial communities.Protistan phytoplankton biomass was 28 times higher in the BC than in oceanicwaters above the BB, attributed mainly to large diatom blooms. In contrast,over the BB, small coccolithophores such as Emilianiahuxleyi, nanoflagellates and phototrophic picoplankton dominated. In turn,the biomass of microheterotrophs above the BB doubled the biomass in the BC dueto large ciliates and dinoflagellates. Notably, toxic phytoplankton species andtheir associated phycotoxins were detected, in particular high abundance of Dinophysis acuminata and pectenotoxinsabove the bank, highlighting their prevalence in open subpolar regions.Picoeukaryotes and Synechococcus wereremarkably important over the bank, both at surface and deep waters. Theirbiomass surpassed that of phototrophic protists by 5 times, emphasizing theimportance of small-sized phytoplankton in low chlorophyll waters. Thehomogeneous water column and high retention over the bank seem to favor thedevelopment of picophytoplankton and microzooplankton and their exportation tothe benthos. Overall, our findings unfold the plankton configuration in theSouthern Patagonian Shelf, ascribed as a sink for anthropogenic CO2,and highlight the diverse ecological traits that microorganisms develop toadjust their yield to changing conditions.
dc.descriptionFil: Guinder, Valeria Ana. 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
dc.descriptionFil: Malits, Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina
dc.descriptionFil: Ferronato, Carola. 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
dc.descriptionFil: Krock, Bernd. Alfred-Wegener-Institute, Bremerhaven; Alemania
dc.descriptionFil: Garzon Cardona, John Edison. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Química del Sur. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; Argentina
dc.descriptionFil: Martinez, Ana M.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Química del Sur. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; Argentina
dc.descriptionXVIII Congreso Latinoamericano de Ciencias del Mar
dc.descriptionArgentina
dc.descriptionAsociación Latinoamericana de Investigadores en Ciencias del Mar
dc.formatapplication/pdf
dc.formatapplication/pdf
dc.formatapplication/pdf
dc.languageeng
dc.publisherAsociación Latinoamericana de Investigadores en Ciencias del Mar
dc.relationinfo:eu-repo/semantics/altIdentifier/url/https://rid.unrn.edu.ar/bitstream/20.500.12049/3880/3/LIBRO-DE-RESUMENES-COLACMAR-2019.pdf
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subjectMicrobial biodiversity
dc.subjectPhycotoxins
dc.subjectSW Atlantic
dc.subjecthttps://purl.org/becyt/ford/1.5
dc.subjecthttps://purl.org/becyt/ford/1
dc.titleContrasting ecological regimes of microbial plankton along beagle channel and burdwood bank in sub-antarctic waters
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typeinfo:eu-repo/semantics/conferenceObject
dc.typeinfo:ar-repo/semantics/documento de conferencia
dc.typeCongreso
dc.typeBook
dc.coverageInternacional


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