Instant sedimentation in a deep Alpine lake (Iseo, Italy) controlled by climate, human and geodynamic forcing

Sedimentology ◽  
2022 ◽  
Author(s):  
William Rapuc ◽  
Fabien Arnaud ◽  
Pierre Sabatier ◽  
Flavio S. Anselmetti ◽  
Andrea Piccin ◽  
...  
Keyword(s):  
Alpine Lake

scholarly journals Diversity of Algae and Cyanobacteria and Bioindication Characteristics of the Alpine Lake Nesamovyte (Eastern Carpathians, Ukraine) from 100 Years Ago to the Present

Diversity ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 256
Author(s):  
Petro M. Tsarenko ◽  
Olena P. Bilous ◽  
Olha M. Kryvosheia-Zakharova ◽  
Halyna H. Lilitska ◽  
Sophia Barinova
Keyword(s):  
Species Composition ◽  
Structural Changes ◽  
Algal Species ◽  
Taxonomic Composition ◽  
Alpine Lake ◽  
Algal Flora ◽  
Ecological Analysis ◽  
Modern Species ◽  
Eastern Carpathians ◽  
Infraspecific Taxa

The species diversity and changes in the structural dynamics of the algal flora from the alpine lake Nesamovyte has been studied for 100 years. During the period of investigations, 234 species (245 infraspecific taxa) were revealed to cover more than 70% of the modern species composition of the studied lake. The modern biodiversity of algae is characterized by an increase in the number of widespread forms, a change from the baseline “montane” complex in comparison to the beginning of the 20th century. Nevertheless, the Nesamovyte Lake still has a unique algae composition that is typical for high-mountainous European lakes. The presence of a different complex of conventionally arctic species of algae, in particular, diatoms is discussed. Structural changes in the taxonomic composition of the algal flora of the lake as well as in the complex of the leading genera, species and their diversity are revealed. An ecological analysis of the algal species composition of the lake showed vulnerability and degradation to the ecosystem of the lake. On this basis, the issue regarding the question of protection and preservation of the algae significance and uniqueness of the flora of algae in the Nesamovyte Lake are discussed.

A paradox of warming in a deep peri-Alpine lake (Lake Lugano, Switzerland and Italy)

Hydrobiologia ◽  
2018 ◽  
Vol 824 (1) ◽  
pp. 215-228 ◽  
Author(s):  
Fabio Lepori ◽  
James J. Roberts ◽  
Travis S. Schmidt
Keyword(s):  
Alpine Lake ◽  
Lake Lugano

A 15 ka pH record from an alpine lake in north China derived from the cyclization ratio index of aquatic brGDGTs and its paleoclimatic significance

2017 ◽  
Vol 109 ◽  
pp. 31-46 ◽  
Author(s):  
Jiantao Cao ◽  
Zhiguo Rao ◽  
Guodong Jia ◽  
Qinghai Xu ◽  
Fahu Chen
Keyword(s):  
North China ◽  
Alpine Lake ◽  
Paleoclimatic Significance

Vegetation and climate history reconstructed from an alpine lake in central Tienshan Mountains since 8.5 ka BP

2015 ◽  
Vol 432 ◽  
pp. 36-48 ◽  
Author(s):  
Xiao-zhong Huang ◽  
Chun-zhu Chen ◽  
Wan-na Jia ◽  
Cheng-bang An ◽  
Ai-feng Zhou ◽  
...  
Keyword(s):  
Alpine Lake ◽  
Climate History ◽  
Vegetation And Climate

Deuterium-excess determination of evaporation to inflow ratios of an alpine lake: Implications for water balance and modeling

2016 ◽  
Vol 31 (5) ◽  
pp. 1034-1046 ◽  
Author(s):  
Jiangpeng Cui ◽  
Lide Tian ◽  
Trent W. Biggs ◽  
Rong Wen
Keyword(s):  
Water Balance ◽  
Alpine Lake ◽  
Deuterium Excess

scholarly journals Polinton-like viruses are abundant in aquatic ecosystems

Microbiome ◽  
2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Christopher M. Bellas ◽  
Ruben Sommaruga
Keyword(s):  
Capsid Protein ◽  
Major Capsid Protein ◽  
Virus Detection ◽  
Virus Genome ◽  
Alpine Lake ◽  
Virus Particles ◽  
Wide Range ◽  
Extracellular Form ◽  
Eukaryotic Organisms ◽  
Dsdna Viruses

Abstract Background Polintons are large mobile genetic elements found in the genomes of eukaryotic organisms that are considered the ancient ancestors of most eukaryotic dsDNA viruses. Originally considered as transposons, they have been found to encode virus capsid genes, suggesting they may actually be integrated viruses; however, an extracellular form has yet to be detected. Recently, circa 25 Polinton-like viruses have been discovered in environmental metagenomes and algal genomes, which shared distantly related genes to both Polintons and virophages (Lavidaviridae). These entities could be the first members of a major class of ancient eukaryotic viruses; however, owing to the lack of available genomes for analysis, information on their global diversity, evolutionary relationships, eukaryotic hosts, and status as free virus particles is limited. Results Here, we analysed the metaviromes of an alpine lake to show that Polinton-like virus genome sequences are abundant in the water column. We identify major capsid protein genes belonging to 82 new Polinton-like viruses and use these to interrogate publicly available metagenomic datasets, identifying 543 genomes and a further 16 integrated into eukaryotic genomes. Using an analysis of shared gene content and major capsid protein phylogeny, we define large groups of Polinton-like viruses and link them to diverse eukaryotic hosts, including a new group of viruses, which possess all the core genes of virophages and infect oomycetes and Chrysophyceae. Conclusions Our study increased the number of known Polinton-like viruses by 25-fold, identifying five major new groups of eukaryotic viruses, which until now have been hidden in metagenomic datasets. The large enrichment (> 100-fold) of Polinton-like virus sequences in the virus-sized fraction of this alpine lake and the fact that their viral major capsid proteins are found in eukaryotic host transcriptomes support the hypothesis that Polintons in unicellular eukaryotes are viruses. In summary, our data reveals a diverse assemblage of globally distributed viruses, associated with a wide range of unicellular eukaryotic hosts. We anticipate that the methods we have developed for Polinton-like virus detection and the database of over 20,000 genes we present will allow for continued discovery and analysis of these new viral groups.

Contribution of Gammarus lacustris to phosphorus recycling in a fishless alpine lake

1999 ◽  
Vol 56 (9) ◽  
pp. 1679-1686 ◽  
Author(s):  
Frank M Wilhelm ◽  
Jeff J Hudson ◽  
David W Schindler
Keyword(s):  
Water Column ◽  
Vertical Migration ◽  
Mountain Lakes ◽  
Plankton Community ◽  
Alpine Lake ◽  
Gammarus Lacustris ◽  
Benthic Pelagic Coupling ◽  
Phosphorus Recycling ◽  
Planktonic Community ◽  
Total P

We estimated the net P transport by Gammarus lacustris from the benthic to pelagic regions of a fishless alpine lake and compared it with P regeneration by the entire plankton community. Gammarus lacustris released between 5.2 and 18.1 ng P·L-1·h-1 (adults only and adults plus immatures, respectively) in the pelagic region during nighttime vertical migration. Additional P released into and removed from the water column due to predation on zooplankton was estimated at 1.87 and 2.3 ng P·L-1·h-1, respectively. The net daily regeneration of 52.2-181.4 ng P·L-1·day-1 by the G. lacustris population represented 9.5-32.9% of the total P regenerated by the planktonic community. The majority of the P released by G. lacustris represents "new" P to the pelagic zone because it originated in sediments. We conclude that G. lacustris can represent an important link in benthic-pelagic coupling in oligotrophic mountain lakes.

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