Unusual biogenic calcite structures in two shallow lakes, James
Ross Island, Antarctica

J 2016

Unusual biogenic calcite structures in two shallow lakes, James Ross Island, Antarctica

ELSTER, Josef, Linda NEDBALOVÁ, Radek VODRÁŽKA, Kamil LÁSKA, Jakub HALODA et. al.

Základní údaje

Originální název

Unusual biogenic calcite structures in two shallow lakes, James Ross Island, Antarctica

Autoři

ELSTER, Josef (203 Česká republika, garant), Linda NEDBALOVÁ (203 Česká republika), Radek VODRÁŽKA (203 Česká republika), Kamil LÁSKA (203 Česká republika, domácí), Jakub HALODA (203 Česká republika) a Jiří KOMÁREK (203 Česká republika)

Vydání

Biogeosciences, 2016, 1726-4170

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10600 1.6 Biological sciences

Stát vydavatele

Německo

Utajení

není předmětem státního či obchodního tajemství

Odkazy

Biogeosciences online

Impakt faktor

Impact factor: 3.851

Kód RIV

RIV/00216224:14310/16:00089157

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.5194/bg-13-535-2016

UT WoS

000369524500014

Klíčová slova anglicky

Antarctica; James Ross Island; lakes; photoautotrophic mat; calcite spicules

Štítky

AKR, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 14. 4. 2017 21:29, Ing. Andrea Mikešková

Anotace

V originále

The floors of two shallow endorheic lakes, located on volcanic surfaces on James Ross Island, are covered with calcareous organosedimentary structures. Their biological and chemical composition, lake water characteristics, and seasonal variability of the thermal regime are introduced. The lakes are frozen down to the bottom for 8–9 months a year and their water chemistry is characterised by low conductivity and neutral to slightly alkaline pH. The photosynthetic microbial mat is composed of filamentous cyanobacteria and microalgae that are considered to be Antarctic endemic species. The mucilaginous black biofilm is covered by green spots formed by a green microalga and the macroscopic structures are packed together with fine material. Thin sections consist of rock substrate, soft biofilm, calcite spicules and mineral grains originating from different sources. The morphology of the spicules is typical of calcium carbonate monocrystals having a layered structure and specific surface texture, which reflect growth and degradation processes. The spicules’ chemical composition and structure correspond to pure calcite. The lakes’ age, altitude, morphometry, geomorphological and hydrological stability, including low sedimentation rates, together with thermal regime predispose the existence of this community. We hypothesise that the precipitation of calcite is connected with the photosynthetic activity of the green microalgae that were not recorded in any other lake in the region. This study has shown that the unique community producing biogenic calcite spicules is quite different to any yet described.

Návaznosti

LM2010009, projekt VaV

Název: Projekt CzechPolar - České polární stanice: Stavba a operační náklady

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Czech Polar - České polární stanice: Stavba a operační náklady

MUNI/A/1370/2014, interní kód MU

Název: Globální environmentální změny v krajinné sféře Země v čase a prostoru (Akronym: GlobST)

Investor: Masarykova univerzita, Globální environmentální změny v krajinné sféře Země v čase a prostoru, DO R. 2020_Kategorie A - Specifický výzkum - Studentské výzkumné projekty

Citovat

ELSTER, Josef, Linda NEDBALOVÁ, Radek VODRÁŽKA, Kamil LÁSKA, Jakub HALODA a Jiří KOMÁREK. Unusual biogenic calcite structures in two shallow lakes, James Ross Island, Antarctica. Biogeosciences. 2016, roč. 13, č. 2, s. 535-549. ISSN 1726-4170. Dostupné z: https://dx.doi.org/10.5194/bg-13-535-2016.

@article{1316098,
   author = {Elster, Josef and Nedbalová, Linda and Vodrážka, Radek and Láska, Kamil and Haloda, Jakub and Komárek, Jiří},
   article_number = {2},
   doi = {http://dx.doi.org/10.5194/bg-13-535-2016},
   keywords = {Antarctica; James Ross Island; lakes; photoautotrophic mat; calcite spicules},
   language = {eng},
   issn = {1726-4170},
   journal = {Biogeosciences},
   title = {Unusual biogenic calcite structures in two shallow lakes, James Ross Island, Antarctica},
   url = {http://www.biogeosciences.net/13/535/2016/},
   volume = {13},
   year = {2016}
}

TY  - JOUR
ID  - 1316098
AU  - Elster, Josef - Nedbalová, Linda - Vodrážka, Radek - Láska, Kamil - Haloda, Jakub - Komárek, Jiří
PY  - 2016
TI  - Unusual biogenic calcite structures in two shallow lakes, James Ross Island, Antarctica
JF  - Biogeosciences
VL  - 13
IS  - 2
SP  - 535-549
EP  - 535-549
SN  - 17264170
KW  - Antarctica
KW  - James Ross Island
KW  - lakes
KW  - photoautotrophic mat
KW  - calcite spicules
UR  - http://www.biogeosciences.net/13/535/2016/
N2  - The floors of two shallow endorheic lakes, located on volcanic surfaces on James Ross Island, are covered with calcareous organosedimentary structures. Their biological and chemical composition, lake water characteristics, and seasonal variability of the thermal regime are introduced. The lakes are frozen down to the bottom for 8–9 months a year and their water chemistry is characterised by low conductivity and neutral to slightly alkaline pH. The photosynthetic microbial mat is composed of filamentous cyanobacteria and microalgae that are considered to be Antarctic endemic species. The mucilaginous black biofilm is covered by green spots formed by a green microalga and the macroscopic structures are packed together with fine material. Thin sections consist of rock substrate, soft biofilm, calcite spicules and mineral grains originating from different sources. The morphology of the spicules is typical of calcium carbonate monocrystals having a layered structure and specific surface texture, which reflect growth and degradation processes. The spicules’ chemical composition and structure correspond to pure calcite. The lakes’ age, altitude, morphometry, geomorphological and hydrological stability, including low sedimentation rates, together with thermal regime predispose the existence of this community. We hypothesise that the precipitation of calcite is connected with the photosynthetic activity of the green microalgae that were not recorded in any other lake in the region. This study has shown that the unique community producing biogenic calcite spicules is quite different to any yet described.
ER  -

ELSTER, Josef, Linda NEDBALOVÁ, Radek VODRÁŽKA, Kamil LÁSKA, Jakub HALODA a Jiří KOMÁREK. Unusual biogenic calcite structures in two shallow lakes, James Ross Island, Antarctica. \textit{Biogeosciences}. 2016, roč.~13, č.~2, s.~535-549. ISSN~1726-4170. Dostupné z: https://dx.doi.org/10.5194/bg-13-535-2016.

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