Description
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.
Versions
Le tableau ci-dessous n'affiche que les versions publiées de la ressource accessibles publiquement.
Comment citer
Les chercheurs doivent citer cette ressource comme suit:
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.
Droits
Les chercheurs doivent respecter la déclaration de droits suivante:
L’éditeur et détenteur des droits de cette ressource est SCAR - Microbial Antarctic Resource System. Ce travail est sous licence Creative Commons Attribution (CC-BY) 4.0.
Enregistrement GBIF
Cette ressource a été enregistrée sur le portail GBIF, et possède l'UUID GBIF suivante : 2ae9d4b7-012b-4649-862f-1c3c6c5f9e5f. SCAR - Microbial Antarctic Resource System publie cette ressource, et est enregistré dans le GBIF comme éditeur de données avec l'approbation du Scientific Committee on Antarctic Research.
Mots-clé
Bacterioplankton; marine bacteria; 16S rRNA; LHPCR; Southern Ocean; icebergs; productivity; aminopeptidase activity; Weddell Sea; Heterotrophy; Other
Données externes
Les données de la ressource sont disponibles dans d'autres formats
| Iceberg Project Website | http://iceberg.dri.edu/ UTF-8 text |
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Contacts
- Fournisseur Des Métadonnées ●
- Créateur ●
- Personne De Contact ●
- Chercheur Principal
- Research Professor
Couverture géographique
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.
| Enveloppe géographique | Sud Ouest [-62, -51], Nord Est [-57, -42] |
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Couverture taxonomique
Plankton surveys of community structure were conducted on bacteria passing through a 3.0 micron membrane filter.
| Domain | Bacteria |
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Couverture temporelle
| Date de début / Date de fin | 2008-06-07 / 2008-06-23 |
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| Date de début / Date de fin | 2014-03-10 / 2014-04-07 |
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Données sur le projet
Pas de description disponible
| Titre | Marine bacterioplankton community structure in the vicinity of Antarctic icebergs |
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| Financement | This research was supported by NSF award ANT-0636543. |
| Description du domaine d'étude / de recherche | 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. |
Les personnes impliquées dans le projet:
- Chercheur Principal
Méthodes d'échantillonnage
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.
| Etendue de l'étude | See Geographic Coverage |
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| Contrôle qualité | Sanger sequence data was assembled and manually curated using Sequencher and chimera checked using Mallard. |
Description des étapes de la méthode:
- 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.
Données de collection
| Nom de la collection | Bacterioplankton around Antarctic Icebergs |
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| Identifiant de collection | IB02 and IB03 |
| Identifiant de la collection parente | Not applicable |
| Méthode de conservation des spécimens | Deep frozen |
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Citations bibliographiques
- 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
Métadonnées additionnelles
marine, harvested by iOBIS
| Identifiants alternatifs | http://gcmd.nasa.gov/KeywordSearch/Metadata.do?Portal=GCMD&MetadataType=0&MetadataView=Full&KeywordPath=&EntryId=NSF-ANT06-36543 |
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| 2ae9d4b7-012b-4649-862f-1c3c6c5f9e5f | |
| https://ipt.biodiversity.aq/resource?r=iceberg_bacterioplanktondiv-murray |