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Statements

Subject Item
n2:RIV%2F60077387%3A_____%2F04%3A00025994%21RIV06-AV0-60077387
rdf:type
skos:Concept n11:Vysledek
dcterms:description
Cyanobacterial mats (CBM) in limestone-based tropical regions of the Caribbean contribute to the primary production, are crucial in marl formation and are known to fix di-nitrogen. Nitrogen fixation ranges from low (< 5 nmol C2H4 cm-2 h-1) to high (12 to 20 nmol C2H4 cm-2 h-1). A linear increase of nitrogenase activity with increasing amount of Stigonematales was proved. Nitrogen-fixing cyanobacteria have delta 15N usually close to 0 ppt. We measured N2-fixation at 12 – 14 different locations parallel with measurement of relevant environmental characteristics and the natural abundance of delta 15N (-1.99 to 11.44 >). Path analysis of the dependence of delta 15N on N2-fixation, NO3-N, and NH4-N in water indicated that the effect of N2-fixation was more important than the effect of nitrogen amount/form in water. The evidence we present suggests that delta 15N can be used as an indicator of the level of N2-fixation by CBM. Sinicové (cyanobakteriální) nárosty jsou důležitou součástí biocenózy alkalických bažin v Karibské oblasti. Jsou primárními producenty, fixují atmosférický dusík a vytvářejí uhličitanové sedimenty. Na 12-14 lokalitách v severním Belize jsme měřili fixaci N2, přírodní podíl delta 15N (-1.99 to 11.44 >), chemismus vody a biomasy. Fixace N2 kolísala od nízkých výkonností (< 5 nmol) do vysokých čísel (12 to 20 nmol C2H4 cm-2 h-1). Lineární vzrůst aktivity nitrogenázy byl spojen se vzrůstající biomasou heterocytózních sinic (Stigonematales, Scytonema, Tolypothrix). Cyanobaktérie, fixující dusík mají delta 15N obyčejně blízký nule. Analýza vztahů mezi podílem delta 15N, fixací N2 a koncentracemi NO3-N a NH4-N ve vodě ukázala, že podíl delta 15N v biomase je závislý nepřímo úměrně na fixaci N2, takže velmi jednoduché stanovení podílu delta 15N může být indikátorem probíhající fixace N2. Cyanobacterial mats (CBM) in limestone-based tropical regions of the Caribbean contribute to the primary production, are crucial in marl formation and are known to fix di-nitrogen. Nitrogen fixation ranges from low (< 5 nmol C2H4 cm-2 h-1) to high (12 to 20 nmol C2H4 cm-2 h-1). A linear increase of nitrogenase activity with increasing amount of Stigonematales was proved. Nitrogen-fixing cyanobacteria have delta 15N usually close to 0 ppt. We measured N2-fixation at 12 – 14 different locations parallel with measurement of relevant environmental characteristics and the natural abundance of delta 15N (-1.99 to 11.44 >). Path analysis of the dependence of delta 15N on N2-fixation, NO3-N, and NH4-N in water indicated that the effect of N2-fixation was more important than the effect of nitrogen amount/form in water. The evidence we present suggests that delta 15N can be used as an indicator of the level of N2-fixation by CBM.
dcterms:title
Delta15 N as an indicator of N2-fixation by cyanobacterial mats in tropical marshes Delta15N jako indicator fixace dusíku cyanobakteriálními sinicemi v tropických mokřadech Delta15 N as an indicator of N2-fixation by cyanobacterial mats in tropical marshes
skos:prefLabel
Delta15 N as an indicator of N2-fixation by cyanobacterial mats in tropical marshes Delta15N jako indicator fixace dusíku cyanobakteriálními sinicemi v tropických mokřadech Delta15 N as an indicator of N2-fixation by cyanobacterial mats in tropical marshes
skos:notation
RIV/60077387:_____/04:00025994!RIV06-AV0-60077387
n3:strany
353;368
n3:aktivita
n15:Z
n3:aktivity
Z(AV0Z6017912)
n3:cisloPeriodika
3
n3:dodaniDat
n16:2006
n3:domaciTvurceVysledku
n4:4204859
n3:druhVysledku
n17:J
n3:duvernostUdaju
n13:S
n3:entitaPredkladatele
n7:predkladatel
n3:idSjednocenehoVysledku
559675
n3:idVysledku
RIV/60077387:_____/04:00025994
n3:jazykVysledku
n6:eng
n3:klicovaSlova
delta 15N; cyanobacteria; nitrogen fixation; wetlands
n3:klicoveSlovo
n12:nitrogen%20fixation n12:delta%2015N n12:cyanobacteria n12:wetlands
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[7823A0D13631]
n3:nazevZdroje
Biogeochemistry
n3:obor
n10:CE
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
3
n3:rokUplatneniVysledku
n16:2004
n3:svazekPeriodika
67
n3:tvurceVysledku
Rejmánek, M. Komárková, Jaroslava Rejmánková, E.
n3:zamer
n14:AV0Z6017912
s:issn
0168-2563
s:numberOfPages
16