Marine bacterioplankton community structure in the vicinity of Antarctic icebergs

Versão mais recente publicado por SCAR - Microbial Antarctic Resource System em 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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Versões

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Como citar

Pesquisadores deveriam citar esta obra da seguinte maneira:

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.

Direitos

Pesquisadores devem respeitar a seguinte declaração de direitos:

O editor e o detentor dos direitos deste trabalho é SCAR - Microbial Antarctic Resource System. This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License.

GBIF Registration

Este recurso foi registrado no GBIF e atribuído ao seguinte GBIF UUID: 2ae9d4b7-012b-4649-862f-1c3c6c5f9e5f.  SCAR - Microbial Antarctic Resource System publica este recurso, e está registrado no GBIF como um publicador de dados aprovado por Scientific Committee on Antarctic Research.

Palavras-chave

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

Dados externos

Os dados de recurso também estão disponíveis em outros formatos

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

Contatos

Quem criou esse recurso:

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

Quem pode responder a perguntas sobre o recurso:

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

Quem preencher os metadados:

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

Quem mais foi associado com o recurso:

Pesquisador 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 delimitadoras Sul Oeste [-62, -51], Norte Leste [-57, -42]

Cobertura Taxonômica

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

Domínio  Bacteria

Cobertura Temporal

Data Inicial / Data final 2008-06-07 / 2008-06-23
Data Inicial / Data final 2014-03-10 / 2014-04-07

Dados Sobre o Projeto

Nenhuma descrição disponível

Título Marine bacterioplankton community structure in the vicinity of Antarctic icebergs
Financiamento This research was supported by NSF award ANT-0636543.
Descrição da Área de Estudo 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.

O pessoal envolvido no projeto:

Pesquisador Principal
Alison Murray

Métodos de Amostragem

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 Estudo See Geographic Coverage
Controle de Qualidade Sanger sequence data was assembled and manually curated using Sequencher and chimera checked using Mallard.

Descrição dos passos do método:

  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.

Dados de Coleção

Nome da Coleção Bacterioplankton around Antarctic Icebergs
Identificador da Coleção IB02 and IB03
Identificador da Coleção Parental Not applicable
Métodos de preservação do espécime Congelado

Citações 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