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Statements

Subject Item
n2:RIV%2F60076658%3A12310%2F12%3A43883720%21RIV13-MSM-12310___
rdf:type
skos:Concept n9:Vysledek
dcterms:description
Cyanobacteria are well adapted to freezing and desiccation; they have been proposed as possible survivors of comprehensive Antarctic glaciations. Filamentous types from the order Oscillatoriales, especially the species Phormidium autumnale Kutzing ex Gomont 1892, have widely diverse morphotypes that dominate in Antarctic aquatic microbial mats, seepages, and wet soils. Currently little is known about the dispersion of cyanobacteria in Antarctica and of their population history. We tested the hypothesis that cyanobacteria survived Antarctic glaciations directly on site after the Gondwana breakup by using the relaxed and strict molecular clock in the analysis of the 16S rRNA gene. We estimated that the biogeographic history of Antarctic cyanobacteria belonging to P.autumnale lineages has ancient origins. The oldest go further back in time than the breakup of Gondwana and originated somewhere on the supercontinent between 442 and 297Ma. Enhanced speciation rate was found around the time of the opening of the Drake Passage (c. 3145Ma) with beginning of glaciations (c. 43Ma). Our results, based primarily on the strains collected in maritime Antarctica, mostly around James Ross Island, support the hypothesis that long-term survival took place in glacial refuges. The high morphological diversification of P.autumnale suggested the coevolution of lineages and formation of complex associations with different morphologies, resulting in a specific endemic Antarctic cyanobacterial flora. Cyanobacteria are well adapted to freezing and desiccation; they have been proposed as possible survivors of comprehensive Antarctic glaciations. Filamentous types from the order Oscillatoriales, especially the species Phormidium autumnale Kutzing ex Gomont 1892, have widely diverse morphotypes that dominate in Antarctic aquatic microbial mats, seepages, and wet soils. Currently little is known about the dispersion of cyanobacteria in Antarctica and of their population history. We tested the hypothesis that cyanobacteria survived Antarctic glaciations directly on site after the Gondwana breakup by using the relaxed and strict molecular clock in the analysis of the 16S rRNA gene. We estimated that the biogeographic history of Antarctic cyanobacteria belonging to P.autumnale lineages has ancient origins. The oldest go further back in time than the breakup of Gondwana and originated somewhere on the supercontinent between 442 and 297Ma. Enhanced speciation rate was found around the time of the opening of the Drake Passage (c. 3145Ma) with beginning of glaciations (c. 43Ma). Our results, based primarily on the strains collected in maritime Antarctica, mostly around James Ross Island, support the hypothesis that long-term survival took place in glacial refuges. The high morphological diversification of P.autumnale suggested the coevolution of lineages and formation of complex associations with different morphologies, resulting in a specific endemic Antarctic cyanobacterial flora.
dcterms:title
Molecular clock evidence for survival of Antarctic cyanobacteria (Oscillatoriales, Phormidium autumnale) from Paleozoic times Molecular clock evidence for survival of Antarctic cyanobacteria (Oscillatoriales, Phormidium autumnale) from Paleozoic times
skos:prefLabel
Molecular clock evidence for survival of Antarctic cyanobacteria (Oscillatoriales, Phormidium autumnale) from Paleozoic times Molecular clock evidence for survival of Antarctic cyanobacteria (Oscillatoriales, Phormidium autumnale) from Paleozoic times
skos:notation
RIV/60076658:12310/12:43883720!RIV13-MSM-12310___
n9:predkladatel
n10:orjk%3A12310
n3:aktivita
n16:P n16:I n16:Z
n3:aktivity
I, P(LA341), P(LM2010009), P(ME 934), P(ME 945), Z(AV0Z60050516)
n3:cisloPeriodika
2
n3:dodaniDat
n14:2013
n3:domaciTvurceVysledku
n4:6712940 n4:6573592 n4:4880218
n3:druhVysledku
n12:J
n3:duvernostUdaju
n6:S
n3:entitaPredkladatele
n8:predkladatel
n3:idSjednocenehoVysledku
151532
n3:idVysledku
RIV/60076658:12310/12:43883720
n3:jazykVysledku
n18:eng
n3:klicovaSlova
Gondwana; biogeography; relaxed and strict molecular clock; cyanobacteria; Phormidium autumnale; Antarctic; DISPERSAL; BIOGEOGRAPHY; ICE; LAKES; DIVERSITY; FRESH-WATER; RIBOSOMAL-RNA; GLACIAL HISTORY; TERRESTRIAL ALGAE; JAMES-ROSS-ISLAND
n3:klicoveSlovo
n11:TERRESTRIAL%20ALGAE n11:relaxed%20and%20strict%20molecular%20clock n11:ICE n11:cyanobacteria n11:Antarctic n11:RIBOSOMAL-RNA n11:DIVERSITY n11:FRESH-WATER n11:Phormidium%20autumnale n11:DISPERSAL n11:GLACIAL%20HISTORY n11:biogeography n11:BIOGEOGRAPHY n11:Gondwana n11:JAMES-ROSS-ISLAND n11:LAKES
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[4C68F981FEB7]
n3:nazevZdroje
FEMS Microbiology Ecology
n3:obor
n19:EF
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
3
n3:projekt
n7:LM2010009 n7:ME%20945 n7:LA341 n7:ME%20934
n3:rokUplatneniVysledku
n14:2012
n3:svazekPeriodika
82
n3:tvurceVysledku
Komárek, Jiří Strunecký, Otakar Elster, Josef
n3:wos
000310261900022
n3:zamer
n21:AV0Z60050516
s:issn
0168-6496
s:numberOfPages
9
n20:doi
10.1111/j.1574-6941.2012.01426.x
n5:organizacniJednotka
12310