Diversity and distribution of Victoria Land biota

Adams, Byron J.; Bardgett, Richard D.; Ayres, Edward; Wall, Diana H.; Aislabie, Jackie; Bamforth, Stuart S.; Bargagli, Roberto; Cary, S. Craig; Cavacini, Paolo; Connell, Laurie B.; Convey, Peter; Fell, Jack W.; Frati, Francesco; Hogg, Ian D.; Newsham, Kevin K.; O’Donnell, Anthony G.; Russell, Nicholas; Seppelt, R. D.; Stevens, Mark I.

doi:10.1016/j.soilbio.2006.04.030

Cited by 284 publications

(276 citation statements)

References 94 publications

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“…Cyanobacteria have been identified in the majority of ice-free habitats on the continent (Broady, 1996(Broady, , 2005Adams et al, 2006). However, it is their presence in Antarctic lakes and ponds that have attracted the most interest and led to detailed research into their taxonomy (morphological and molecular), community structure, biogeographical distribution and physiology (for example, Vincent et al, 1993;Taton et al, 2003Taton et al, , 2006ade los Ríos et al, 2004;Jungblut et al, 2005;Novis and Smissen, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Aeolian distribution of freeze-dried mats from lakes and ponds has been documented (for example, Parker et al, 1982;Moorhead et al, 2003). In these extremely low carbon environments, microbial mats have been shown to be an important source of present-day carbon (Adams et al, 2006), and thus may play an important role in soil ecosystem functioning. Recent molecular-based studies investigating entire prokaryote communities of Dry Valley soils have shown contradicting results regarding cyanobacterial diversity.…”

Section: Introductionmentioning

confidence: 99%

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Sources of edaphic cyanobacterial diversity in the Dry Valleys of Eastern Antarctica

et al. 2008

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Cyanobacteria are major components of Antarctic Dry Valley ecosystems. Their occurrence in lakes and ponds is well documented, however, less is known about their distribution in edaphic environments. There has been considerable debate about the contribution of aquatic organic matter derived largely from cyanobacteria to terrestrial ecosystems. In this study, automated rRNA intergenic spacer analysis (ARISA) and 16S rRNA gene clone libraries were used to investigate cyanobacterial diversity in a range of soil environments within the Miers and Beacon Valleys. These data were used to elucidate the input of aquatic cyanobacteria to soil communities. Thirty-eight samples were collected from a variety of soil environments including dry and moist soils, hypoliths and lake and hydroterrestrial microbial mats. The results from the ARISA and 16S rRNA clone library analysis demonstrated that diverse cyanobacterial communities exist within the mineral soils of the Miers Valley. The soil samples from Beacon Valley were depauparate in cyanobacterial signals. Within Miers Valley, significant portions (29%-58%) of ARISA fragment lengths found in aquatic cyanobacterial mats were also present in soil and hypolith samples, indicating that lacustrine and hydroterrestrial cyanobacteria play a significant role in structuring soil communities. The influence of abiotic variables on the community structure of soil samples was assessed using BEST analysis. The results of BEST analysis of samples from within Miers Valley showed that total percentage of carbon content was the most important variable in explaining differences in cyanobacterial community structure. The BEST analyses indicated that four elements contributed significantly to species compositional differences between valleys. We suggest that the complete absence of lakes or ponds from Beacon Valley is a contributing factor to the low cyanobacterial component of these soils.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sources of edaphic cyanobacterial diversity in the Dry Valleys of Eastern Antarctica

et al. 2008

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“…In contrast to diatoms and cyanobacteria, the green algal component of microbial mats has remained virtually unstudied. The available data are largely restricted to morphological taxonomic inventories on the continent, such as Victoria Land (Cavacini 2001;Adams et al 2006), the Antarctic Peninsula (Mataloni & Pose 2001) and maritime Antarctica (Fermani et al 2007;Zidarova 2007). Broady (1996) suggested that most Antarctic terrestrial green algae are cosmopolitan taxa.…”

Section: Introductionmentioning

confidence: 99%

Hidden levels of phylodiversity in Antarctic green algae: further evidence for the existence of glacial refugia

et al. 2009

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Recent data revealed that metazoans such as mites and springtails have persisted in Antarctica throughout several glacial -interglacial cycles, which contradicts the existing paradigm that terrestrial life was wiped out by successive glacial events and that the current inhabitants are recent colonizers. We used molecular phylogenetic techniques to study Antarctic microchlorophyte strains isolated from lacustrine habitats from maritime and continental Antarctica. The 14 distinct chlorophycean and trebouxiophycean lineages observed point to a wide phylogenetic diversity of apparently endemic Antarctic lineages at different taxonomic levels. This supports the hypothesis that long-term survival took place in glacial refugia, resulting in a specific Antarctic flora. The majority of the lineages have estimated ages between 17 and 84 Ma and probably diverged from their closest relatives around the time of the opening of Drake Passage (30 -45 Ma), while some lineages with longer branch lengths have estimated ages that precede the break-up of Gondwana. The variation in branch length and estimated age points to several independent but rare colonization events.

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“…The Dry Valleys comprise one of the most inhospitable, trophically simple ecosystems on Earth 8,9 . Devoid of vascular plant life [8][9][10] , the Dry Valley ecosystem supports only a handful of microscopic invertebrate, lichen and moss species 9,10 .…”

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confidence: 99%

“…Devoid of vascular plant life [8][9][10] , the Dry Valley ecosystem supports only a handful of microscopic invertebrate, lichen and moss species 9,10 . However, the bulk of Dry Valley biodiversity and biomass consists of edaphic bacteria 8,11,12 , as few other organisms can endure the region's extreme temperature and light regimes, high soil salt concentrations, near-negligible levels of organic C and N, and scarcity of liquid water 10,12 .…”

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confidence: 99%

Rapid microbial response to the presence of an ancient relic in the Antarctic Dry Valleys

et al. 2012

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Diversity and distribution of Victoria Land biota

Cited by 284 publications

References 94 publications

Sources of edaphic cyanobacterial diversity in the Dry Valleys of Eastern Antarctica

Sources of edaphic cyanobacterial diversity in the Dry Valleys of Eastern Antarctica

Hidden levels of phylodiversity in Antarctic green algae: further evidence for the existence of glacial refugia

Rapid microbial response to the presence of an ancient relic in the Antarctic Dry Valleys

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