Chemical limnology in coastal East Antarctic lakes: monitoring future climate change in centres of endemism and biodiversity

Verleyen, Elie; Hodgson, Dominic A.; Gibson, John A.E.; Imura, Satoru; Kaup, Enn; Kudoh, S.; Wever, Aaike De; Hashizume, Tamotsu; McMinn, Andrew; Obbels, Dagmar; Roberts, D; Roberts, Stephen; Sabbe, K.; Souffreau, Caroline; Tavernier, Ines; Nieuwenhuyze, Wim Van; Ranst, Éric Van; Vindevogel, N; Vyverman, Wim

doi:10.1017/s0954102011000642

Cited by 29 publications

(26 citation statements)

References 43 publications

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“…The ice-free Antarctic oases often represent Earth’s past geologic and climatic evolution thus are good ecological indicators for future global climate change [12,44-49]. Since 1961, the mean annual temperature increased by 1°C from −11°C to approximately −10°C ( http://south.aari.nw.ru/data/data.asp?lang=0&station=1) in the Schirmacher Oasis may have resulted in an increased melting of snow, glacial, and continental ice thereby affecting the distribution and organization of the lacustrine systems.…”

Section: Discussionmentioning

confidence: 99%

Bacterial diversity of the rock-water interface in an East Antarctic freshwater ecosystem, Lake Tawani(P)†

et al. 2013

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Schirmacher Oasis is one of the few ice-free plateaus in East Antarctica that maintains a unique distribution of over 120 microbial-rich, dynamic freshwater lakes, most of which are unexplored. In this study, we describe the bacterial diversity of the rock-water interface in Lake Tawani(P) using culture-independent Bacterial Tag Encoded FLX Amplicon Pyrosequencing (bTEFAP), clone library construction, and culture-based analysis targeting the eubacterial 16S rRNA gene. Lake Tawani(P)was formed in a fossil valley by the accumulation of snow and glacial melt through surface channels into a low-catchment depression. Overall this lake exhibited thirteen bacterial phyla and one-hundred and twelve genera. The Qiime bioinformatics analysis on the bTEFAP alone exhibited higher coverage of the bacterial composition in Lake Tawani(P) than the clone library construction or culture-based methodology. Particularly due to the higher sensitivity of the bTEFAP approach, we detected and differentiated members of the phyla: Chloroflexi, Gemmatimonadetes, Planctomycetes, Nitrospira, and Candidate Division TM7 that other methods were unable to reveal. Nevertheless we found that the use of multiple approaches identified a more complete bacterial community than by using any single approach. Investigating the bacterial diversity of the Schirmacher Oasis lakes, especially those connected through surface channels and encompassed by valleys, will help unravel the dynamic nature of these unique seasonal, freshwater lakes, which potentially harbors highly adapted bacterial taxa with defined ecological functions.

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Section: Discussionmentioning

confidence: 99%

Bacterial diversity of the rock-water interface in an East Antarctic freshwater ecosystem, Lake Tawani(P)†

et al. 2013

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“…Conductivity has been found to be the most ecologically important variable for diatom communities in water bodies on sub-Antarctic and maritime Antarctic islands, and continental Antarctica (e.g. McMinn, 1996, 1998;Van de Vijver and Beyens, 1999b;Verleyen et al, 2003Verleyen et al, , 2012Saunders et al, 2009;Kopalov a et al, 2013;Van Nieuwenhuyze et al, unpubl. data).…”

Section: Importance Of Conductivity On Diatom Assemblagesmentioning

confidence: 99%

A diatom–conductivity transfer function for reconstructing past changes in the Southern Hemisphere westerly winds over the Southern Ocean

Saunders

Hodgson

Mcmurtrie³

et al. 2015

J Quaternary Science

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Sub-Antarctic islands are ideally placed to reconstruct past changes in Southern Hemisphere westerly wind behaviour. They lie within their core belt (50-60˚S) and the strong winds deliver sea salt ions to the islands resulting in a west to east conductivity gradient in their water bodies. This means that the stronger (or weaker) the winds, the higher (or lower) the conductivity values measured in the water bodies. A survey of the water chemistry and diatom assemblages of lakes and ponds on sub-Antarctic Campbell Island (52˚32 0 S, 169˚8 0 E) revealed that, similar to other sub-Antarctic islands, conductivity was the most important, statistically significant ecological variable explaining turnover in diatom community structure. Based on this, a diatom-conductivity transfer function was developed (simple weighted averaging with inverse deshrinking: R 2 ¼ 0.86, R 2 jack ¼ 0.66, RMSEP ¼ 0.25 log 10 mS cm À1 ). This transfer function will be applied to lake sediment cores from the western edge of the Campbell Island plateau to reconstruct past conductivity/sea spray and therefore directly reconstruct changes in Southern Hemisphere westerly wind strength within their core belt.

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“…In recent years, Antarctic microbial mats have attracted a lot of scientific interest, with the photoautotrophic taxa such as cyanobacteria (Taton et al 2006), green algae (De Wever et al 2009) and diatoms (Sabbe et al 2003) probably being the best-studied groups. Water depth (and hence light climate), liquid water availability, and conductivity or related parameters are the most important variables in structuring these communities (Hodgson et al 2004;Verleyen et al 2010). Surprisingly, only a small number of studies have focussed on the heterotrophic bacterial diversity in these microbial mats (Brambilla et al 2001;Van Trappen et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Heterotrophic bacterial diversity in aquatic microbial mat communities from Antarctica

et al. 2011

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25Heterotrophic bacteria isolated from five aquatic microbial mat samples from different locations in 26 continental Antarctica and the Antarctic Peninsula were compared to assess their biodiversity. A total of 27 2225 isolates obtained on different media and at different temperatures were included. After an initial 28 grouping by whole-genome fingerprinting, partial 16S rRNA gene sequence analysis was used for further 29 identification. These results were compared with previously published data obtained with the same 30 methodology from terrestrial and aquatic microbial mat samples from two additional Antarctic regions. 31The phylotypes recovered in all these samples belonged to five major phyla, Actinobacteria, 32Bacteroidetes, Proteobacteria, Firmicutes and Deinococcus-Thermus, and included several potentially 33 new taxa. Ordination analyses were performed in order to explore the variance in the diversity of the 34 samples at genus level. Habitat type (terrestrial versus aquatic) and specific conductivity in the lacustrine 35 systems significantly explained the variation in bacterial community structure. Comparison of the 36 phylotypes with sequences from public databases showed that a considerable proportion (36.9%) is 37 currently known only from Antarctica. This suggests that in Antarctica both cosmopolitan taxa as well as 38 taxa with limited dispersal and a history of long-term isolated evolution occur.

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Chemical limnology in coastal East Antarctic lakes: monitoring future climate change in centres of endemism and biodiversity

Cited by 29 publications

References 43 publications

Bacterial diversity of the rock-water interface in an East Antarctic freshwater ecosystem, Lake Tawani(P)†

Bacterial diversity of the rock-water interface in an East Antarctic freshwater ecosystem, Lake Tawani(P)†

A diatom–conductivity transfer function for reconstructing past changes in the Southern Hemisphere westerly winds over the Southern Ocean

Heterotrophic bacterial diversity in aquatic microbial mat communities from Antarctica

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