Marine bacterioplankton community structure in the vicinity of Antarctic icebergs

Última versión Publicado por SCAR - Microbial Antarctic Resource System en Mar 19, 2019 SCAR - Microbial Antarctic Resource System

We studied marine bacterioplankton in the Scotia Sea in June 2008 and in the northwest Weddell Sea in March to mid April 2009 in waters proximal to three free-drifting icebergs (SS-1, A-43k, and C-18a), in a region with a high density of smaller icebergs (iceberg alley), and at stations that were upstream of the iceberg trajectories designated as far-field reference sites that were between 16-75 km away. Hydrographic parameters were used to define water masses in which comparisons between bacterioplankton-associated characteristics within and between water masses could be made. Influences of the icebergs on early winter Scotia Sea bacterioplankton were minimal, if not deleterious, as we found lower levels of heterotrophic production near A-43k in comparison to stations > 16 km away. Small but significant differences in bacterioplankton community structure were observed between two icebergs studied in early winter Scotia Sea. These icebergs differed greatly in size and the findings suggest that the larger iceberg had a greater effect. In the NW Weddell Sea in March–mid April there were some significant differences in community structure in the winter water and underlying upper circumpolar deep water masses between stations occupied close to C-18a and at stations 18 km away (i.e. Polaribacter and Pelagibacter-related 16S rRNA gene fragments were at low levels at the 18 km stations), though higher resolution, high throughput profiling tools will be needed to pinpoint specific organisms and ecological types. Likewise, a better understanding of local to regional scale structure of bacterioplankton communities is necessary. Overall, the results show that bacterioplankton, dominated by Rhodobacteracae Pelagibacter, and uncultivated Gammaproteobacteria groups were minimally influenced by icebergs in the regions and seasons studied here – at least directly – though further work addressing different scales, sizes of icebergs, and seasons is needed to better understand bacterioplankton-associated ecological processes and carbon cycling in regions of high iceberg production.

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Versiones

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¿Cómo referenciar?

Los usuarios deben citar este trabajo de la siguiente manera:

Murray, AE, V Peng, C Tyler, P Wagh. 2011. Marine bacterioplankton biomass, activity and community structure in the vicinity of Antarctic icebergs. Deep Sea Research, II. 58: 1407-1421.

Derechos

Los usuarios deben respetar los siguientes derechos de uso:

El publicador y propietario de los derechos de este trabajo es SCAR - Microbial Antarctic Resource System. This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License.

Registro GBIF

Este recurso ha sido registrado en GBIF con el siguiente UUID: 2ae9d4b7-012b-4649-862f-1c3c6c5f9e5f.  SCAR - Microbial Antarctic Resource System publica este recurso, y está registrado en GBIF como un publicador de datos avalado por Scientific Committee on Antarctic Research.

Palabras Clave

Bacterioplankton; marine bacteria; 16S rRNA; LHPCR; Southern Ocean; icebergs; productivity; aminopeptidase activity; Weddell Sea; Heterotrophy; Other

Datos externos

Los datos del recurso también están disponibles en otros formatos

Iceberg Project Websitehttp://iceberg.dri.edu/ UTF-8 text

Contactos

¿Quién creó el recurso?:

Alison Murray
Research Professor
Desert Research Institute 2215 Raggio Parkway 89512 Reno CA US 775-673-7361
http://www.dri.edu/alison-murray

¿Quién puede resolver dudas acerca del recurso?:

Alison Murray
Research Professor
Desert Research Institute 2215 Raggio Parkway 89512 Reno CA US 775-673-7361
http://www.dri.edu/alison-murray

¿Quién documentó los metadatos?:

Alison Murray
Research Professor
Desert Research Institute 2215 Raggio Parkway 89512 Reno CA US 775-673-7361
http://www.dri.edu/alison-murray

¿Quién más está asociado con el recurso?:

Investigador Principal
Alison Murray
Research Professor
Desert Research Institute 2215 Raggio Parkway 89512 Reno CA US 775-673-7361
http://www.dri.edu/alison-murray

Cobertura Geográfica

This study occurred over two cruises in 2008 in the Scotia Sea, and in 2009 in the NW Weddell Sea, thus the bounding box encompasses the coverage in both cruises.

Coordenadas límite Latitud Mínima Longitud Mínima [-62, -51], Latitud Máxima Longitud Máxima [-57, -42]

Cobertura Taxonómica

Plankton surveys of community structure were conducted on bacteria passing through a 3.0 micron membrane filter.

Dominio  Bacteria

Cobertura Temporal

Fecha Inicial / Fecha Final 2008-06-07 / 2008-06-23
Fecha Inicial / Fecha Final 2014-03-10 / 2014-04-07

Datos del Proyecto

No hay descripción disponible

Título Marine bacterioplankton community structure in the vicinity of Antarctic icebergs
Fuentes de Financiación This research was supported by NSF award ANT-0636543.
Descripción del Área de Estudio Hydrological casts of the water column were collected to 500 m using a Conductivity-Temperature-Depth (CTD) rosette in areas surrounding three icebergs, SS-1, and A-43k in the Scotia Sea north of the South Shetland Islands, and C-18a during March to mid April 2009 in the Powell Basin region in the NW Weddell Sea.

Personas asociadas al proyecto:

Investigador Principal
Alison Murray

Métodos de Muestreo

Samples were collected at 8 depths between 10-500 m with a CTD rosette and Niskin bottles and a tow fish for selected surface samples. Seawater for molecular analyses was filtered first through an in-line 3.0 micron filter and the < 3.0 micron fraction was collected onto a 0.2 micron filter.

Área de Estudio See Geographic Coverage
Control de Calidad Sanger sequence data was assembled and manually curated using Sequencher and chimera checked using Mallard.

Descripción de la metodología paso a paso:

  1. Three bacterial 16S rRNA gene clone libraries were prepared for this data set. A MICROBIAL_SEQUENCE_SET Description file describing 3 data sets was uploaded to the IPT. MIMARKS data for these three samples were uploaded to the IPT.

Datos de la Colección

Nombre de la Colección Bacterioplankton around Antarctic Icebergs
Identificador de la Colección IB02 and IB03
Identificador de la Colección Parental Not applicable
Métodos de preservación de los ejemplares Congelado

Referencias Bibliográficas

  1. Vernet, M., KL Smith Jr., AO Cefarelli, JJ Helly, RS Kaufmann, H Lin, DG Long, AE Murray, BH Robison, HA Ruhl, TJ Shaw, AD Sherman, J Sprintall, GR Stephenson Jr., KM Stuart, BS Twining. 2012. Islands of ice: Influence of free-drifting Antarctic icebergs on pelagic marine ecosystems. Oceangr. 25(3): 38-39. http://dx.doi.org/10.5670/oceanog.2012.72