Connell Laurie, Segee Benjamin, Redman Regina, Rodriguez Russell J, Staudigel Hubert
School of Marine Sciences and Molecular and Biomedical Sciences, University of Maine, Orono, ME 04469, USA.
Adaptive Symbiotic Technologies, University of Washington, Seattle, WA 98195, USA.
Life (Basel). 2018 Sep 6;8(3):37. doi: 10.3390/life8030037.
In this work, we explore the biodiversity of culturable microfungi from the water column of a permanently ice-covered lake in Taylor Valley, Antarctica from austral field seasons in 2003, 2008 and 2010, as well as from glacial stream input (2010). The results revealed that there was a sharp decline in total culturable fungal abundance between 9 and 11 m lake depth with a concurrent shift in diversity. A total of 29 species were identified from all three water sources with near even distribution between Ascomycota and Basidomycota (15 and 14 respectively). The most abundant taxa isolated from Lake Fryxell in 2008 were (59%) followed by spp. (10%), both of which were restricted to 9 m and above. Although seven species were found below the chemocline of 11 m in 2008, their abundance comprised only 10% of the total culturable fungi. The taxa of isolates collected from glacial source input streams had little overlap with those found in Lake Fryxell. The results highlight the spatial discontinuities of fungal populations that can occur within connected oligotrophic aquatic habitats.
在这项研究中，我们探索了2003年、2008年和2010年南半球野外考察季期间，以及2010年冰川溪流输入的水样中，南极洲泰勒谷一个常年被冰覆盖的湖泊水柱中可培养微真菌的生物多样性。结果显示，在湖泊深度9至11米之间，可培养真菌的总丰度急剧下降，同时多样性也发生了变化。从所有三个水源中共鉴定出29个物种，子囊菌门和担子菌门的分布近乎均匀（分别为15种和14种）。2008年从弗里克塞尔湖分离出的最丰富的分类群是（59%），其次是 spp.（10%），这两种都局限于9米及以上深度。尽管2008年在11米的化学分层以下发现了7个物种，但它们的丰度仅占可培养真菌总数的10%。从冰川源输入溪流中收集的分离物分类群与在弗里克塞尔湖发现的分类群几乎没有重叠。研究结果突出了在相互连接的贫营养水生栖息地中可能出现的真菌种群的空间不连续性。
