The distribution of diatom flora in ice caves of the northern Yukon Territory, Canada: relationship to air circulation and freezing

Lauriol, Bernard; Prévost, Clément; Lacelle, Denis

doi:10.5038/1827-806x.35.2.4

Cited by 27 publications

(12 citation statements)

References 25 publications

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“…Finally sample bottles were fixed with formaldehyde until the concentration was 4%. Materials obtained were subjected to chemical process with HCl %10, H 2 SO 4 %30, KMnO 4 and oxalic acid (Lauriol et al, 2006). Samples entirely cleaned from organic material were made ready as permanent preparations.…”

Section: Methodsmentioning

confidence: 99%

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Sabancı¹

2012

Turk. J. Fish. Aquat. Sci.

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The taxonomical composition of epilithic diatoms was investigated at intertidal zone of Homa lagoon, Aegean sea, Turkey. The stations are located in different littoral zones of the study area and they are different from each other in terms of hydrological respect. The samples contained a mixture of forms growing on the stones themselves, on silt accumulated on the stones and forms epiphytic on other algae, I will refer to this collective community as epilithon. Epilithic diatom species, which constitute the majority of the community were examined from obtained material. A total of 67 diatom taxa belonging to 34 genera were identified to the genus or species level. The species more frequently found in the samples were Cocconeis placentula, Cocconeis scutellum, Mastogloia pumila, Navicula cincta and Navicula crypyocephala var. veneta. Nine of the species identified during the research period seem to be previously unreported for Turkish coastal waters. Morphological characteristics of these species were given in detail information and original photographs.Keywords: Epilithic diatom, species identification, Homa lagoon, Aegean Sea, Eastern Mediterranean Sea. Kıyısal Lagündeki (Ege Denizi, Türkiye) Doğal Substratumda Bulunan Bentik Diyatomelerin Taksonomik Olarak İncelenmesi ÖzetEpilitik diyatomelerin tür kompozisyonu, Homa lagününün (Ege Denizi, Türkiye) kıyısal zonunda incelenmiştir. İstasyonlar, çalışma bölgesinin farklı kıyısal zonlarında yer almaktadır ve hidrolojik açıdan birbirlerinden farklıdır. Alınan örnekler, taş üzerinde bulunan diyatomeleri, taş üzerine biriken kum taneciklerine yapışarak yaşayan diyatomeleri ve diğer algler üzerinde bulunan epifitik diyatomeleri kapsamaktadır ve bu kommunite epiliton olarak ifade edilmektedir. Kommunitenin büyük çoğunluğunu oluşturan epilitik diyatome türleri toplanan materyalde incelenmiş, 34 genusa ait toplam 67 taxa, tür ve genus seviyesinde tanımlanmıştır. Cocconeis placentula, Cocconeis scutellum, Mastogloia pumila, Navicula cincta and Navicula crypyocephala var. veneta türleri örnekleme boyunca sık bulunan türlerdir. Araştırma döneminde saptanan türlerin 9 tanesi Türkiye kıyısal suları için daha önceden rapor edilmemiştir. Bu türlere ait detaylı morfolojik özellikler ve orijinal fotoğraflar çalışmaya eklenmiştir.

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Section: Methodsmentioning

confidence: 99%

Untitled

Sabancı¹

2012

Turk. J. Fish. Aquat. Sci.

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“…However, very little is known to date about microorganisms communities living in ice deposits from caves, an isolated and light deprived cold environment that ensures advanced species' conservation, and no temporal-dependence studies of these microorganisms diversity were carried out on this type of habitat. Only a few studies report the isolation of bacteria (Margesin et al 2004) and diatom flora (Lauriol et al 2006) from ice caves, whereas the vast majority of ice caves studies targeted their palaeoclimatic information (Racovita & Serban 1990;yonge & MacDonald 1999;Citterio et al 2004;Kern et al 2004;Holmlund et al 2005;Luetscher 2005;Feurdean et al 2011;Maggi et al 2011). However, unraveling the ice cave biodiversity could complement the palaeoclimate record, in addition to the broad bionanotechnological potential of phychrophilic species isolated from this particular environment.…”

Section: Introductionmentioning

confidence: 99%

Searching for cold-adapted microorganisms in the underground glacier of Scarisoara Ice Cave, Romania

Hillebrand-Voiculescu¹,

Iţcuş²,

Ioan³

et al. 2015

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UDC 551. 444.6:579.26(498) Alexandra Hillebrand, Corina Itcus, Ioan Ardelean, Denisa Pascu, Aurel Perşoiu, Andreea Rusu, Traian Brad, Elena Popa, Bogdan P. Onac & Cristina Purcarea: Searching for cold-adapted microorganisms in the underground glacier of Scarisoara Ice Cave, RomaniaScarisoara Ice Cave (Romania) hosts one of world's largest and oldest underground glacier. While no studies were carried out on the existence of microorganisms in this cave's ice block, our interest is to investigate the presence of microorganisms and their chronological distribution in the cave's subterranean ice in relationship with past climatic changes. Samples were collected from ice layers of different age (from present to ~900 cal. yrs. BP), and the diversity of embedded microbial communities was assessed by classical cultivation and molecular techniques. The microorganisms from icesediments were cultivated at 4 °C and 15 °C, in the presence and absence of light. Epifluorescence microscopy analysis indicates the presence of autotrophic prokaryotes and eukaryotes in sunlightexposed ice and water samples. Total DNA was isolated from each ice sample and the bacterial and eukaryotic SSU-rRNA genes were amplified by PCR. The chemical composition and organic content of both deeply buried (>10 m inside the ice block) and surface (supra-glacial pond water) habitats were analyzed in relation to their age and organic composition. This study is the first to report on the presence of both prokaryotic and eukaryotic microorganisms in the subterranean ice block of Scarisoara Ice Cave, thriving in both organic-rich ice and clear ice layers. Phototrophic prokaryotes and eukaryotes were identified in sun-exposed recent ice. The compo- študija obravnava pojavnost in časovno porazdelitev mikroorganizmov v jamskem ledu v Ledeni jami Scarisoara (Romunija), v kateri je eden največjih in najstarejših jamskih ledenikov. Pojavnost mikroorganizmov nas zanima predvsem v povezavi s preteklimi klimatskimi spremembami. Vzorčili smo v različnih plasteh ledu, starih od 900 let do recentnih in v njih določevali združbe mikroorganizmov z klasičnim gojenjem in z molekularnimi metodami. Mikroorganizme iz lednih sedimentov smo v temi in na svetlobi gojili na temperaturah 5 °C in 15 °C. Epifluorescentna mikroskopija je pokazala prisotnost avtotrofnih prokariontov in evkariontov v vzorcih ledu in vode, ki so bili izpostavljeni sončnemu obsevanju. Iz ledu smo izolirali celotno DNK ter bakterijske in evkariont ske gene male ribosomske podenote (SSU-rRNA) namnožili s poli merazno verižno reakcijo (PCR). Kemično sestavo in organ ski delež globoko pokopanih (več kot 10 m globoko v ledu) in površinskih (vodni bazen na površini ledu) habitatov smo povezali z njihovo starostjo in organsko sestavo. študija prva poroča o prokariontskih in evkariontskih mikroorganizmih v podzemnem ledu jame Scarisoara, ki uspevajo tako v organsko bogatih plasteh ledu kot v prosojnem ledu. V ledu, izpostavljenem sončni svetlobi, smo odkrili prisotnost fototrofnih prokariontov in evkar...

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“…Studies on diatoms in mountain streams have been conducted in the headwaters of montane to alpine regions in Canada (Antoniades and Douglas 2002;Lauriol et al 2006), Russia (Potapova 1996;Medvedeva 2001), Poland (Kownacki et al 2006), and Bolivia (ServantVildary 1982). Recently, studies related to climate change and biological water assessment have been conducted, including research on the integrity of freshwater ecosystems (Falasco et al 2012), physicochemical factors of upland blanket peat catchments (O'Driscoll et al 2012), aquatic ecosystem monitoring, and on monitoring the integrity of biological resources and habitats.…”

Section: Introductionmentioning

confidence: 99%

A study of low-temperature and mountain epilithic diatom community in mountain stream at the Han River system, Korea

Kim

Lee

2017

j ecology environ

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Background: This study was conducted to assess the physicochemical water quality and the altitudinal distribution of low-temperature and mountain epilithic diatom (LTMD) community in Buk and Hangae streams that are located in Seorak Mountain with the height of 1708 m in Korea. And the community characteristics of LTMD found in the Buk and Hangae streams were compared to that of LTMD from the Han River system.

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The distribution of diatom flora in ice caves of the northern Yukon Territory, Canada: relationship to air circulation and freezing

Cited by 27 publications

References 25 publications

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Searching for cold-adapted microorganisms in the underground glacier of Scarisoara Ice Cave, Romania

A study of low-temperature and mountain epilithic diatom community in mountain stream at the Han River system, Korea

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