学術雑誌論文 Atmospheric bioaerosols originating from Adélie penguins (Pygoscelis adeliae): Ecological observations of airborne bacteria at Hukuro Cove, Langhovde, Antarctica

10 ( 1 )  , pp.71 - 78 , 2016-03
ISSN:1873-9652
内容記述
The relationship between atmospheric bioaerosols and ecosystems is currently of global importance. Antarctica has an extreme climate, meaning that ecosystem behavior in this region is relatively simple. Direct sampling of atmospheric bioaerosols was performed at an Adélie penguin (Pygoscelis adeliae) colony at Hukuro Cove, Langhovde, Antarctica on 22 January 2013. The aim of the sampling was to reveal the effect of the penguins on the Antarctic ecosystem within the atmospheric bioaerosols. Samples were bio-analyzed using a next-generation sequencing method. Biomass concentrations of Bacilli-class bacteria were 19.4 times higher when sampled leeward of the penguin colony compared with windward sampling. The source of these bacteria was the feces of the penguins. Predicted atmospheric trajectories indicate that the bacteria disperse towards the Southern Ocean. The largest biomass concentration in the windward bacteria was of the Gammaproteobacteria class, which decreased markedly with distance through the penguin colony, being deposited on soil, surface water, and ocean. It is concluded that bioaerosols and ecosystems near the penguin colony strongly influence each other.
大気バイオエアロゾル(生物粒子)と生態系の関係は、近年地球規模の研究として注目されている。南極は極限気候であり、生態系は比較的簡素なことから影響が検討し易い。大気バイオエアロゾル直接採集が、2013年1月22日、ラングホブデ袋浦のアデリーペンギンコロニーで行われ、分析は次世代シークエンスを用いた。コロニー風下のBacilli網濃度は、風上の19.4倍も高く、起源はペンギンの糞であり、南極海へ拡散していた。風上ではGammaproteobacteria網が最も多く、コロニー通過時著しく減少した。これはコロニーの土壌、水たまり、海水に沈着したためと考えられる。ペンギンコロニーでは大気バイオエアロゾルと生態系が相互に強く影響している。

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