Marked Seasonal Changes in the Microbial Production, Community Composition, and Biogeochemistry of Glacial Snowpack Ecosystems in the Maritime Antarctic
Marked Seasonal Changes in the Microbial Production, Community Composition, and Biogeochemistry of Glacial Snowpack Ecosystems in the Maritime Antarctic
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南极海域冰川积雪生态系统微生物生产、群落组成和生物地球化学的明显季节变化
DOI:
10.1029/2020jg005706
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发表时间:
2021
期刊:
影响因子:
4.9
通讯作者:
Hodson A
中科院分区:
文献类型:
--
作者:
Hodson A
We describe seasonal changes in the biogeochemistry, microbial community and ecosystem production of two glacial snowpacks in the maritime Antarctic during a cold summer. Frequent snowfall and low, intermittent melt on the glaciers suppressed surface photosynthesis and promoted net heterotrophy. Concentrations of autotrophic cells (algae and cyanobacteria) were therefore low (average: 150–500 cells mL−1), and short‐term estimates of primary production were almost negligible in early summer (<0.1 μg C L−1d−1). However, order of magnitude increases in Chlorophyllaconcentrations occurred later, especially within the mid‐snowpack and ice layers below. Short‐term primary production increased to ca. 1 μg C L−1d−1in mid‐summer, and reached 53.1 μg C L−1d−1in a mid‐snow layer close to an active penguin colony. However, there were significantly more bacteria than autotrophs in the snow (typically 103cells mL−1, but >104cells mL−1in basal ice near the penguin colony). The ratio of bacteria to autotrophs also increased throughout the summer, and short‐term bacterial production rates (0.2–2000 μg C L−1d−1) usually exceeded primary production, especially in basal ice (10–1400 μg C L−1d−1). The basal ice represented the least diverse but most productive habitat, and a striking feature was its low pH (down to 3.3). Furthermore, all of the overlying snow cover became increasingly acidic as the summer season progressed, which is attributed to enhanced emissions from wet guano in the penguin colony. The study demonstrates that active microbial communities can be expected, even when snowmelt is intermittent in the Antarctic summer.
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影响因子:
2.9
作者:
Nowak A
通讯作者:
Nowak A
DOI:
--
发表时间:
1972
期刊:
影响因子:
--
作者:
W. Thomas
通讯作者:
W. Thomas
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
D. Vaughan
通讯作者:
D. Vaughan
影响因子:
5.5
作者:
CHRISTIE, P
通讯作者:
CHRISTIE, P
DOI:
--
发表时间:
1983
期刊:
影响因子:
--
作者:
A. Tatur;A. Myrcha
通讯作者:
A. Myrcha