Recent applications of molecular genetics to edaphic microbial communities of the McMurdo Dry Valleys and elsewhere have rejected a long-held belief that Antarctic soils contain extremely limited microbial diversity. The Inter-Valley Soil Comparative Survey aims to elucidate the factors shaping these unique microbial communities and their biogeography by integrating molecular genetic approaches with biogeochemical analyses. Although the microbial communities of Dry Valley soils may be complex, there is little doubt that the ecosystem’s food web is relatively simple, and evidence suggests that physicochemical conditions may have the dominant role in shaping microbial communities. To examine this hypothesis, bacterial communities from representative soil samples collected in four geographically disparate Dry Valleys were analyzed using molecular genetic tools, including pyrosequencing of 16S rRNA gene PCR amplicons. Results show that the four communities are structurally and phylogenetically distinct, and possess significantly different levels of diversity. Strikingly, only 2 of 214 phylotypes were found in all four valleys, challenging a widespread assumption that the microbiota of the Dry Valleys is composed of a few cosmopolitan species. Analysis of soil geochemical properties indicated that salt content, alongside altitude and Cu2+, was significantly correlated with differences in microbial communities. Our results indicate that the microbial ecology of Dry Valley soils is highly localized and that physicochemical factors potentially have major roles in shaping the microbiology of ice-free areas of Antarctica. These findings hint at links between Dry Valley glacial geomorphology and microbial ecology, and raise previously unrecognized issues related to environmental management of this unique ecosystem.
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Pesquisadores deveriam citar esta obra da seguinte maneira:
Lee CK, Barbier BA, Bottos EM, McDonald IR, Cary SC (2012) The Inter-Valley Soil Comparative Survey: the ecology of Dry Valley edaphic microbial communities. ISME J 6: 1046–1057. doi:10.1038/ismej.2011.170.
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O editor e o detentor dos direitos deste trabalho é SCAR - Microbial Antarctic Resource System. This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC) 4.0 License.
Este recurso foi registrado no GBIF e atribuído ao seguinte GBIF UUID: cca539d1-3e43-49bb-8e1f-8c1bda934a8c. SCAR - Microbial Antarctic Resource System publica este recurso, e está registrado no GBIF como um publicador de dados aprovado por Scientific Committee on Antarctic Research.
Bacteria; Cyanobacteria; Fungi; Terrestrial Antarctica; McMurdo Dry Valleys; 16S rRNA; Soil; Metadata
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The McMurdo Dry Valleys
|Coordenadas delimitadoras||Sul Oeste [-78,091, 160,764], Norte Leste [-76,912, 163,809]|
Molecular surveys of bacterial (16S rRNA) and fungal (ITS) marker genes
|Data Inicial / Data final||2006-12-01 / 2006-12-31|
|Data Inicial / Data final||2008-01-01 / 2008-01-31|
|Data Inicial / Data final||2010-11-01 / 2010-11-30|
Dados Sobre o Projeto
Nenhuma descrição disponível
|Título||Inter-Valley Soil Comparative Survey of the McMurdo Dry Valleys|
|Financiamento||Funding was provided by the New Zealand Foundation for Research, Science and Technology (FRST) (UOWX0715) and the New Zealand Marsden Fund (UOW1003). Logistics support was provided by Antarctica New Zealand.|
|Descrição da Área de Estudo||Soil was collected at six different sites in the McMurdo Dry Valleys: Alatna Valley, Battleship Promontory, Upper Wright Valley, Beacon Valley, University Valley, and Miers Valley.|
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Métodos de Amostragem
Sampling sites were all located on a south facing, 0–20°slope. An intersection was made by two 50 m transects, with the intersection in the middle being the central sampling point (X or C). Four sampling points around the central point were marked (A–D with A being the southernmost point and the remaining points in an anti-clockwise order, or N, E, S, W). Five scoops of the top 2 cm of soil were collected and homogenized at each identified (1 m2) sampling point after pavement pebbles were removed. Samples were stored in sterile Whirl-Pak (Nasco International, Fort Atkinson, WI, USA) at −20 °C until returned to New Zealand, where they were stored at −80 °C until analysis.
|Área de Estudo||See Geographic Coverage|
|Controle de Qualidade||454 pyrosquencing flowgrams were denoised using AmpliconNoise, including a SeqNoise step to remove PCR errors and a Perseus step to remove PCR chimeras. See Lee et al 2012 and Dreesens et al 2014 for details.|
Descrição dos passos do método:
- Two MICROBIAL_SEQUENCE_SET description files describing X data sets was uploaded to the IPT. X MIMARKS data files were uploaded to the IPT.
Dados de Coleção
|Nome da Coleção||Soil Samples from McMurdo Dry Valleys, Antarctica|
|Identificador da Coleção||N/A|
|Identificador da Coleção Parental||N/A|
|Métodos de preservação do espécime||Congelado|
- Dreesens L, Lee CK, Cary SC (2014) The Distribution and Identity of Edaphic Fungi in the McMurdo Dry Valleys. Biology 3: 466–483. doi:10.3390/biology3030466. 10.3390/biology3030466