Marine bacterioplankton community structure in the vicinity of Antarctic icebergs

http://ipt.biodiversity.aq/resource.do?r=iceberg_bacterioplanktondiv-murray
Download dataset
organizationName http://www.dri.edu/alison-murray
bounding Coordinates {"south":"-62","north":"-57","west":"-51","east":"-42"}
abstract 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.

MiMarks Samples

IB03_039:500
submitted_to_insdc investigation_type geo_loc_name
collection_date biome feature
env_package subspecf_gen_lin biotic_relationship
samp_mat_process samp_size samp_size_unit
seq_meth alt_unit depth
aminopept_act aminopept_act_unit ammonium
density density_unit diss_oxygen
nitrate nitrate_unit nitrite
oxy_stat_samp phosphate phosphate_unit
salinity_unit silicate silicate_unit
temp_unit PAR PAR_unit
IB03_029:200
submitted_to_insdc investigation_type geo_loc_name
collection_date biome feature
env_package subspecf_gen_lin biotic_relationship
samp_mat_process samp_size samp_size_unit
seq_meth alt_unit depth
aminopept_act aminopept_act_unit ammonium
density density_unit diss_oxygen
nitrate nitrate_unit nitrite
oxy_stat_samp phosphate phosphate_unit
salinity_unit silicate silicate_unit
temp_unit PAR PAR_unit
IB03_046:40
submitted_to_insdc investigation_type geo_loc_name
collection_date biome feature
env_package subspecf_gen_lin biotic_relationship
samp_mat_process samp_size samp_size_unit
seq_meth alt alt_unit
depth_unit aminopept_act aminopept_act_unit
ammonium_unit density density_unit
diss_oxygen_unit nitrate nitrate_unit
nitrite_unit oxy_stat_samp phosphate
salinity salinity_unit silicate
temp temp_unit PAR
Leucine_incorporation Leucine_incorporation_unit DAPI-stained_cells

Sequence sets

IB03_046:40
collection_date study_type target_gene
forward_primer reverse_primer forward_primer_sequence
primer_5 primer_3 genbank_contigs
seq_yr run_type sequence_data_repository
dataset_id created_at updated_at
IB03_029:200
collection_date study_type target_gene
forward_primer reverse_primer forward_primer_sequence
primer_5 primer_3 genbank_contigs
seq_yr run_type sequence_data_repository
dataset_id created_at updated_at
IB03_039:500
collection_date study_type target_gene
forward_primer reverse_primer primer_5
genbank_contigs sequencing_technology seq_yr
sequence_data_repository genbank_accession_numbers dataset_id
Position: