Interannual meteorological variability and its effects on a lake from maritime Antarctica

Rochera, Carlos; Justel, Ana; Fernández‐Valiente, Eduardo; Bañón, M.; Rico, Eugenio; Toro, Manuel; Camacho, Antonio; Quesada, Antonio

doi:10.1007/s00300-010-0879-8

Cited by 31 publications

(56 citation statements)

References 41 publications

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“…Even though temperate habitats from alpine areas in New Zealand and marine influenced sites in Europe are not fully comparable to polar habitats, these results are corroborated by studies on eukaryote biogeography finding bi-polar distributions of fungal OTUs (Cox et al, 2016), testate amoebae (Yang et al, 2010), and bryophyte species (Biersma et al, 2017). These findings suggest that the global dispersal of certain (microbial) species is combined with environmental selection shaping bacterial communities in the polar regions (Vyverman et al, 2010;Chong et al, 2015;Cox et al, 2016), though temporal (Rochera et al, 2010) or spatial (Villaescusa et al, 2013) variability in environmental conditions can cause differences among prokaryotic meta-communities in polar habitats. Highly seasonal conditions in the polar regions (Chong et al, 2015), such as the absence of light in winter (Alonso-Saez et al, 2012) freezing and limited freshwater availability Mohit et al, 2017) and low temperatures (Yergeau et al, 2007(Yergeau et al, , 2012Kleinteich et al, 2012) may cause the observed differences between polar and non-polar communities, since non-polar regions exhibit more moderate environmental conditions.…”

Section: Discussionmentioning

confidence: 71%

Pole-to-Pole Connections: Similarities between Arctic and Antarctic Microbiomes and Their Vulnerability to Environmental Change

et al. 2017

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The global biogeography of microorganisms remains poorly resolved, which limits the current understanding of microbial resilience toward environmental changes. Using high-throughput 16S rRNA gene amplicon sequencing, we characterized the microbial diversity of terrestrial and lacustrine biofilms from the Arctic, Antarctic and temperate regions. Our analyses suggest that bacterial community compositions at the poles are more similar to each other than they are to geographically closer temperate habitats, with 32% of all operational taxonomic units (OTUs) co-occurring in both polar regions. While specific microbial taxa were confined to distinct regions, representing potentially endemic populations, the percentage of cosmopolitan taxa was higher in Arctic (43%) than in Antarctic samples (36%). The overlap in polar microbial OTUs may be explained by natural or anthropogenically-mediated dispersal in combination with environmental filtering. Current and future changing environmental conditions may enhance microbial invasion, establishment of cosmopolitan genotypes and loss of endemic taxa.

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Section: Discussionmentioning

confidence: 71%

Pole-to-Pole Connections: Similarities between Arctic and Antarctic Microbiomes and Their Vulnerability to Environmental Change

et al. 2017

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“…In contrast, in lakes from the Maritime Antarctica, like Lake Limnopolar, during the progress of the summer season, the underwater light regime follows a progressive change towards higher transparency, resulting in higher planktonic production just at the onset of ice melting due to increases in nutrients and light availability [19]. Otherwise, the maximum fl ows in the outlets, which allow the entrance of allochthonous material, occur during snow melt between December and January [11] 4.3 Biological communities of the lakes Lakes from Byers Peninsula show a low biodiversity compared to those of temperate environments, with microbial dominated communities, determined by the environmental hardness.…”

Section: Most Relevant Hydrological Processesmentioning

confidence: 99%

Maritime Antarctic Lakes As Sentinels Of Climate Change

Camacho

Rochera

Villaescusa

et al. 2012

Lake Sustainability

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Remote lakes, such as lakes from the Maritime Antarctica, can be used as sentinels of climate change, because they are mostly free of direct anthropogenic pressures, and they experience climate change as a main stressor capable of modifying the ecosystem structure and function. In this paper, the content of a lecture that has been presented at the First Conference of Lake Sustainability, which has been centred in our studies on lakes from Byers Peninsula (Maritime Antarctica), are summarized. These included physical, chemical and biological studies of these lakes and other freshwater ecosystems, which highlighted the relevance of biotic interactions for these ecosystems and its sensibility to temperature variations and to biological invasions, which is of relevance given the acute regional warming occurring during the last decades in the area, concomitant with the enhancement of dispersion of alien species linked to the increased presence of humans.

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“…In freshwater ecosystems (lakes, streams, and ponds), biological activity is strongly influenced by ice phenology (thickness, transparency, and duration) (Rochera et al 2010, Quesada andVela´zquez 2013). Pond systems in early summer can be highly depleted in inorganic carbonate, resulting in pH maxima .9 before ice melt because of CO 2 uptake under ice cover.…”

Section: Ice and Snowmentioning

confidence: 99%

“…Consequently, primary production in these ecosystems is restricted to species adapted to photosynthesize under extremely low irradiances, with mixotrophs playing an important role (Rochera et al 2010, Quesada andVela´squez 2013).…”

Section: Ice and Snowmentioning

confidence: 99%

The spatial structure of Antarctic biodiversity

Convey

Chown

Clarke

et al. 2014

Ecological Monographs

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Patterns of environmental spatial structure lie at the heart of the most fundamental and familiar patterns of diversity on Earth. Antarctica contains some of the strongest environmental gradients on the planet and therefore provides an ideal study ground to test hypotheses on the relevance of environmental variability for biodiversity. To answer the pivotal question, “How does spatial variation in physical and biological environmental properties across the Antarctic drive biodiversity?” we have synthesized current knowledge on environmental variability across terrestrial, freshwater, and marine Antarctic biomes and related this to the observed biotic patterns. The most important physical driver of Antarctic terrestrial communities is the availability of liquid water, itself driven by solar irradiance intensity. Patterns of biota distribution are further strongly influenced by the historical development of any given location or region, and by geographical barriers. In freshwater ecosystems, free water is also crucial, with further important influences from salinity, nutrient availability, oxygenation, and characteristics of ice cover and extent. In the marine biome there does not appear to be one major driving force, with the exception of the oceanographic boundary of the Polar Front. At smaller spatial scales, ice cover, ice scour, and salinity gradients are clearly important determinants of diversity at habitat and community level. Stochastic and extreme events remain an important driving force in all environments, particularly in the context of local extinction and colonization or recolonization, as well as that of temporal environmental variability. Our synthesis demonstrates that the Antarctic continent and surrounding oceans provide an ideal study ground to develop new biogeographical models, including life history and physiological traits, and to address questions regarding biological responses to environmental variability and change.

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Interannual meteorological variability and its effects on a lake from maritime Antarctica

Cited by 31 publications

References 41 publications

Pole-to-Pole Connections: Similarities between Arctic and Antarctic Microbiomes and Their Vulnerability to Environmental Change

Pole-to-Pole Connections: Similarities between Arctic and Antarctic Microbiomes and Their Vulnerability to Environmental Change

Maritime Antarctic Lakes As Sentinels Of Climate Change

The spatial structure of Antarctic biodiversity

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