要旨
As a consequence of global change, the High Arctic is warming twice as fast as the rest of the world – yet, very little is known about the microbes inhabiting this environment, their role in nutrient cycling, and how this part of the world will be affected. In order to shed light on these critical knowledge gaps, we performed extensive analyses of soil and sediment cores sampled from Lake Hazen, the world’s largest High Arctic lake by volume. To mimic the effects of global warming, we took advantage of the spatial heterogeneity of its glaciarized tributaries, following a gradient of runoff regimes across the watershed of this lake. We first showed that a warming world may lead to a decrease in taxonomic and functional diversity of sediment prokaryotes, and affect nutrient cycling in unpredictable ways. By combining this sequencing of environmental DNA with RNA sequencing, we further reconstructed both the lake’s virosphere and the hosts of these viruses, quantifying their phylogenetic placement and diversity, to predict that climate change is likely to increase spillover risk. Should climate change also shift species range of potential viral vectors and reservoirs northwards, the High Arctic could become fertile ground for emerging pandemics.
第77回は新型コロナウイルスの影響を受け、ウェブ会議システムZoomを用いて開催いたします。
ポスターは作成次第掲示いたします。
過去のセミナーの詳細はこちら。
つくば進化生態学セミナーは、気鋭の研究者をつくばに招いて白熱した議論を気軽に楽しもう、というコンセプトで開いています。世話人は主に学生ですが温かく見守ってください。
向峯(mw.bioeco[at]gmail.com) / 横井