說明
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.
版本
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如何引用
研究者應依照以下指示引用此資源。:
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.
權利
研究者應尊重以下權利聲明。:
此資料的發布者及權利單位為 SCAR - Microbial Antarctic Resource System。 This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.
GBIF 註冊
此資源已向GBIF註冊，並指定以下之GBIF UUID: 2ae9d4b7-012b-4649-862f-1c3c6c5f9e5f。 SCAR - Microbial Antarctic Resource System 發佈此資源，並經由Scientific Committee on Antarctic Research同意向GBIF註冊成為資料發佈者。
關鍵字
Bacterioplankton; marine bacteria; 16S rRNA; LHPCR; Southern Ocean; icebergs; productivity; aminopeptidase activity; Weddell Sea; Heterotrophy; Other
聯絡資訊
- 元數據提供者 ●
- 出處 ●
- 連絡人 ●
- 研究主持人
地理涵蓋範圍
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.
| 界定座標範圍 | 緯度南界 經度西界 [-62, -51], 緯度北界 經度東界 [-57, -42] |
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分類群涵蓋範圍
Plankton surveys of community structure were conducted on bacteria passing through a 3.0 micron membrane filter.
| Domain | Bacteria |
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時間涵蓋範圍
| 起始日期 / 結束日期 | 2008-06-07 / 2008-06-23 |
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| 起始日期 / 結束日期 | 2014-03-10 / 2014-04-07 |
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計畫資料
無相關描述
| 計畫名稱 | Marine bacterioplankton community structure in the vicinity of Antarctic icebergs |
|---|---|
| 經費來源 | This research was supported by NSF award ANT-0636543. |
| 研究區域描述 | 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. |
參與計畫的人員:
- 研究主持人
取樣方法
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.
| 研究範圍 | See Geographic Coverage |
|---|---|
| 品質控管 | Sanger sequence data was assembled and manually curated using Sequencher and chimera checked using Mallard. |
方法步驟描述:
- 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.
收藏資料
| 蒐藏名稱 | Bacterioplankton around Antarctic Icebergs |
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| 蒐藏編號 | IB02 and IB03 |
| 上層採集品識別碼 | Not applicable |
| 標本保存方法 | Deep frozen |
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引用文獻
- 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
額外的詮釋資料
marine, harvested by iOBIS