Bacterial dynamics in first year sea ice and underlying seawater of Saroma-ko Lagoon (Sea of Okhotsk, Japan) and Resolute Passage (High Canadian Arctic): Inhibitory effects of ice algae on bacterial dynamics

2000 ◽  
Vol 46 (7) ◽  
pp. 623-632 ◽  
Author(s):  
Patrick Monfort ◽  
Serge Demers ◽  
Maurice Levasseur
Keyword(s):  
Sea Ice ◽  
Algal Biomass ◽  
Bacterial Abundance ◽  
Canadian Arctic ◽  
Total Cell ◽  
First Year ◽  
Ice Algae ◽  
Inhibitory Effects ◽  
Bacterial Dynamics ◽  
Culturable Fraction

The seasonal development of bacterial abundance in first year bottom ice and underlying seawater were studied at Saroma-ko Lagoon in Hokkaido, Japan, and at Resolute Passage in the High Canadian Arctic during the algal bloom in spring 1992. The aim of this study was to evaluate whether the high algal concentrations reached during the bloom of ice algae have inhibitory effects on bacterial dynamics. Bacterial abundance (measured as total cell count and colony-forming units CFU) increased with the increase of the algal biomass up to 500 µg Chla·L-1in both locations. Culturable fraction (measured as the percentage of CFU counts versus the total cell counts) was between 7% and 22% at Saroma-ko, and approximately 0.08% at Resolute Passage. When algal biomass exceeded 500 µg of Chla·L-1, both bacterial abundance and culturable fraction decreased significantly. There was a maximum threshold of algal biomass (between 500 and 800 µg of Chla·L-1) after which bacterial dynamics become negatively coupled to the algal biomass. These results suggest that bactericidal and/or bacteriostatic compounds from these extremely high algal concentrations could explain the decrease in bacterial abundance and culturability in bottom ice observed after the ice algae bloom.Key words: bacteria, culturability, algae, inhibitory effects, sea ice, Arctic.

Comparison of Ascat Estimated Snow Thickness on First-Year Sea Ice in the Canadian Arctic with Modeled and Passive Microwave Data

2020 ◽  
Author(s):  
John J. Yackel ◽  
Torsten Geldsetzer ◽  
Mallik Mahmud ◽  
Rory Armstrong ◽  
Vishnu Nandan ◽  
...  
Keyword(s):  
Sea Ice ◽  
Canadian Arctic ◽  
Passive Microwave ◽  
First Year ◽  
Snow Thickness ◽  
Microwave Data

scholarly journals Mesoscale distribution and functional diversity of picoeukaryotes in the first-year sea ice of the Canadian Arctic

2013 ◽  
Vol 7 (8) ◽  
pp. 1461-1471 ◽  
Author(s):  
Kasia Piwosz ◽  
Józef Maria Wiktor ◽  
Andrea Niemi ◽  
Agnieszka Tatarek ◽  
Christine Michel
Keyword(s):  
Sea Ice ◽  
Functional Diversity ◽  
Canadian Arctic ◽  
First Year

scholarly journals Monitoring evolution of melt ponds on first-year and multiyear sea ice in the Canadian Arctic Archipelago with optical satellite data

2020 ◽  
Vol 61 (82) ◽  
pp. 154-163
Author(s):  
Qing Li ◽  
Chunxia Zhou ◽  
Lei Zheng ◽  
Tingting Liu ◽  
Xiaotong Yang
Keyword(s):  
Sea Ice ◽  
Canadian Arctic ◽  
Arctic Sea Ice ◽  
First Year ◽  
Landsat 8 ◽  
Canadian Arctic Archipelago ◽  
Melt Pond ◽  
Melt Ponds ◽  
Validation Experiment ◽  
Multiyear Ice

AbstractThe evolution of melt ponds on Arctic sea ice in summer is one of the main factors that affect sea-ice albedo and hence the polar climate system. Due to the different spectral properties of open water, melt pond and sea ice, the melt pond fraction (MPF) can be retrieved using a fully constrained least-squares algorithm, which shows a high accuracy with root mean square error ~0.06 based on the validation experiment using WorldView-2 image. In this study, the evolution of ponds on first-year and multiyear ice in the Canadian Arctic Archipelago was compared based on Sentinel-2 and Landsat 8 images. The relationships of pond coverage with air temperature and albedo were analysed. The results show that the pond coverage on first-year ice changed dramatically with seasonal maximum of 54%, whereas that on multiyear ice changed relatively flat with only 30% during the entire melting period. During the stage of pond formation, the ponds expanded rapidly when the temperature increased to over 0°C for three consecutive days. Sea-ice albedo shows a significantly negative correlation (R = −1) with the MPF in melt season and increases gradually with the refreezing of ponds and sea ice.

scholarly journals Estimation of Level and Deformed First-Year Sea Ice Surface Roughness in the Canadian Arctic Archipelago from C- and L-Band Synthetic Aperture Radar

2019 ◽  
Vol 45 (3-4) ◽  
pp. 457-475 ◽  
Author(s):  
Silvie Marie Cafarella ◽  
Randall Scharien ◽  
Torsten Geldsetzer ◽  
Stephen Howell ◽  
Christian Haas ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Sea Ice ◽  
Synthetic Aperture Radar ◽  
Canadian Arctic ◽  
Synthetic Aperture ◽  
First Year ◽  
Canadian Arctic Archipelago ◽  
Ice Surface ◽  
L Band ◽  
Ice Surface Roughness

A Subice Suction Corer for Sampling Epontic Ice Algae

1988 ◽  
Vol 45 (3) ◽  
pp. 562-568 ◽  
Author(s):  
Harold E. Welch ◽  
Martin A. Bergmann ◽  
John K. Jorgenson ◽  
William Burton
Keyword(s):  
Sea Ice ◽  
Quantitative Assessment ◽  
Early Spring ◽  
Late Winter ◽  
First Year ◽  
Ice Algae ◽  
Sources Of Error

Standard SIPRE coring was compared with a new Subice Suction Corer and cores taken by diver for the quantitative assessment of epontic (subice) algae on first-year congelation sea ice at Resolute, N.W.T., Canada (≈75°N). The diver cores were probably most accurate but were slow and costly. SIPRE coring was as good as other techniques in late winter and early spring but gave progressively poorer (under) estimates as the season progressed, with up to 90% of the ice algae being lost from SIPRE cores by June. The Subice Suction Corer was fast, easy to operate, cheap, and gave results comparable with samples obtained by diving. Sources of error are discussed.

scholarly journals Brief Communication: Capturing scales of spatial heterogeneity of Antarctic sea ice algae communities

2016 ◽  
Author(s):  
Alexander L. Forrest ◽  
Lars C. Lund-Hansen ◽  
Brian K. Sorrell ◽  
Isak Bowden-Floyd ◽  
Vanessa Lucieer ◽  
...  
Keyword(s):  
Sea Ice ◽  
Spatial Heterogeneity ◽  
First Year ◽  
Ice Algae ◽  
Ecosystem Response ◽  
Algae Biomass ◽  
Sea Ice Algae ◽  
Antarctic Sea Ice ◽  
Spectral Bands ◽  
Antarctic Waters

Abstract. Identifying spatial heterogeneity of sea ice algae communities is critical to predicting ecosystem response under future climate scenarios. Using an autonomous robotic sampling platform beneath sea ice in McMurdo Sound, Antarctica, we measured irradiance in spectral bands expected to describe the spatial heterogeneity. Derived estimates of ice algae biomass identified patchiness at length scales varying from 50–70 m under first-year sea ice. These results demonstrate that a step-change in how these communities can be assessed and monitored. The developed methodologies could be subsequently refined to further categorize different ice algae communities and their associated productivity in both Arctic and Antarctic waters.

scholarly journals Contrasting Ice Algae and Snow‐Dependent Irradiance Relationships Between First‐Year and Multiyear Sea Ice

2019 ◽  
Vol 46 (19) ◽  
pp. 10834-10843 ◽  
Author(s):  
Benjamin A. Lange ◽  
Christian Haas ◽  
Joannie Charette ◽  
Christian Katlein ◽  
Karley Campbell ◽  
...  
Keyword(s):  
Sea Ice ◽  
First Year ◽  
Ice Algae

scholarly journals Erratum: Mesoscale distribution and functional diversity of picoeukaryotes in the first-year sea ice of the Canadian Arctic

2014 ◽  
Vol 8 (5) ◽  
pp. 1152-1152
Author(s):  
Kasia Piwosz ◽  
Józef Maria Wiktor ◽  
Andrea Niemi ◽  
Agnieszka Tatarek ◽  
Christine Michel
Keyword(s):  
Sea Ice ◽  
Functional Diversity ◽  
Canadian Arctic ◽  
First Year
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