Phytoplankton population dynamics in perennially ice-covered Lake Fryxell, Antarctica

Spaulding, Sarah A.; McKnight, Diane M.; Smith, Richard L.; Dufford, Richard

doi:10.1093/plankt/16.5.527

Cited by 66 publications

(51 citation statements)

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“…Even if a comparison based on species inventory had limits, these species were not observed in other mat samples or in the plankton of Lake Fryxell (34,50,53,66).…”

Section: Discussionmentioning

confidence: 91%

Cyanobacterial Diversity in Natural and Artificial Microbial Mats of Lake Fryxell (McMurdo Dry Valleys, Antarctica): a Morphological and Molecular Approach

Taton

Grubisic

Brambilla

et al. 2003

Appl Environ Microbiol

430

296

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Currently, there is no consensus concerning the geographic distribution and extent of endemism in Antarctic cyanobacteria. In this paper we describe the phenotypic and genotypic diversity of cyanobacteria in a field microbial mat sample from Lake Fryxell and in an artificial cold-adapted sample cultured in a benthic gradient chamber (BGC) by using an inoculum from the same mat. Light microscopy and molecular tools, including 16S rRNA gene clone libraries, denaturing gradient gel electrophoresis, and sequencing, were used. For the first time in the study of cyanobacterial diversity of environmental samples, internal transcribed spacer (ITS) sequences were retrieved and analyzed to complement the information obtained from the 16S rRNA gene. Microscopy allowed eight morphotypes to be identified, only one of which is likely to be an Antarctic endemic morphotype. Molecular analysis, however, revealed an entirely different pattern. A much higher number of phylotypes (15 phylotypes) was found, but no sequences from Nodularia and Hydrocoryne, as observed by microscopy, were retrieved. The 16S rRNA gene sequences determined in this study were distributed in 11 phylogenetic lineages, 3 of which were exclusively Antarctic and 2 of which were novel. Collectively, these Antarctic sequences together with all the other polar sequences were distributed in 22 lineages, 9 of which were exclusively Antarctic, including the 2 novel lineages observed in this study. The cultured BGC mat had lower diversity than the field mat. However, the two samples shared three morphotypes and three phylotypes. Moreover, the BGC mat allowed enrichment of one additional phylotype. ITS sequence analysis revealed a complex signal that was difficult to interpret. Finally, this study provided evidence of molecular diversity of cyanobacteria in Antarctica that is much greater than the diversity currently known based on traditional microscopic analysis. Furthermore, Antarctic endemic species were more abundant than was estimated on the basis of morphological features. Decisive arguments concerning the global geographic distribution of cyanobacteria should therefore incorporate data obtained with the molecular tools described here.

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“…Even if a comparison based on species inventory had limits, these species were not observed in other mat samples or in the plankton of Lake Fryxell (34,50,53,66).…”

Section: Discussionmentioning

confidence: 91%

Cyanobacterial Diversity in Natural and Artificial Microbial Mats of Lake Fryxell (McMurdo Dry Valleys, Antarctica): a Morphological and Molecular Approach

Taton

Grubisic

Brambilla

et al. 2003

Appl Environ Microbiol

430

296

View full text Add to dashboard Cite

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“…and Synechococcus sp. are also major components of the plankton in the meromictic lakes of the McMurdo Dry Valleys (Vincent and Vincent 1982;Spaulding et al 1994;Roberts et al 2000;Bielewicz et al 2011). Cryptophytes and P. gelidicola are mixotrophic in Ace Lake, other Vestfold Hills saline lakes and in Lakes Fryxell, Hoare and Bonney in the Dry Valleys, ingesting bacteria and/or taking up dissolved organic carbon (Marshall and Laybourn-Parry 2002;Laybourn-Parry et al 2005;Thurman et al 2012).…”

Section: Community Structurementioning

confidence: 99%

Ace Lake: three decades of research on a meromictic, Antarctic lake

Laybourn‐Parry

Bell

2014

Polar Biol

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“…; Ballantyne, 2002;Carrivick et al, 2013). Moreover, they substantially control exchange of material, nutrients Maurice et al, 2002;Conovitz et al, 2006) and organic matter (Spaulding et al, 1994;Simmons et al, 2013). Equally important is the function of proglacial hydrology as a habitat supporting the existence and evolution of flora and fauna (e.g.…”

Section: Introductionmentioning

confidence: 99%

Seasonal hydrological and suspended sediment transport dynamics in proglacial streams, James Ross Island, Antarctica

Kavan

Ondruch

Nývlt

et al. 2016

Geografiska Annaler: Series A, Physical Geography

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Rapid warming of the Antarctic Peninsula is producing accelerated glacier mass loss and can be expected to have significant impacts on meltwater runoff regimes and proglacial fluvial activity. This study presents analysis of the hydrology and suspended sediment dynamics of two proglacial streams on James Ross Island, Antarctic Peninsula. Mean water discharge during 8/1/2015 to 18/2/2015 reached 0.19 m 3 s -1 and 0.06 m 3 s -1 for Bohemian Stream and Algal Stream, respectively, equivalent to specific runoff of 76 mm month -1 and 60 mm month -1 . The daily discharge regime strongly correlated with air and ground temperatures. The effect of global radiation on proglacial water discharge was found low to negligible. Suspended sediment concentrations of Bohemian Stream were very high (up to 2927 mg L -1 ) due to aeolian supply and due to the high erodibility of local rocks. Total sediment yield (186 t km -2 yr -1 ) was high for (nearly) deglaciated catchments, but relatively low in comparison with streams draining more glaciated alpine and arctic catchments. The sediment provenance was mostly local Cretaceous marine and aeolian sediments; volcanic rocks are not an important source for suspended load. High Rb/Sr ratios for some samples suggested chemical weathering. Overall, this monitoring of proglacial hydrological and suspended sediment dynamics contributes to the dearth of such data from Antarctic environments and offers an insight to the nature of the proglacial fluvial activity, which is likely to be in a transient state with ongoing climate change.

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Phytoplankton population dynamics in perennially ice-covered Lake Fryxell, Antarctica

Cited by 66 publications

References 0 publications

Cyanobacterial Diversity in Natural and Artificial Microbial Mats of Lake Fryxell (McMurdo Dry Valleys, Antarctica): a Morphological and Molecular Approach

Cyanobacterial Diversity in Natural and Artificial Microbial Mats of Lake Fryxell (McMurdo Dry Valleys, Antarctica): a Morphological and Molecular Approach

Ace Lake: three decades of research on a meromictic, Antarctic lake

Seasonal hydrological and suspended sediment transport dynamics in proglacial streams, James Ross Island, Antarctica

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