Is the nitrification a redundant process in arid regions?: activity, abundance and diversity of nitrifier microorganisms

We tested if the microbial functional redundancy concept (theory relating changes in ecosystem functioning by species loss) apply for changes in the ammonium-oxidizing community (nitrifier bacteria) due to: a) grazing disturbance, b) seasonal variations (dry season vs. wet season), c) habitat type (...

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Autores principales:	NOE,LAURA, ABRIL,ADRIANA
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2013
Materias:	arid Chaco Monte desert PCR-DGGE similarity index species replacement
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000300009
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spelling	oai:scielo:S0716-078X20130003000092013-11-11Is the nitrification a redundant process in arid regions?: activity, abundance and diversity of nitrifier microorganismsNOE,LAURAABRIL,ADRIANA arid Chaco Monte desert PCR-DGGE similarity index species replacement We tested if the microbial functional redundancy concept (theory relating changes in ecosystem functioning by species loss) apply for changes in the ammonium-oxidizing community (nitrifier bacteria) due to: a) grazing disturbance, b) seasonal variations (dry season vs. wet season), c) habitat type (soil vs. organic residues), and d) ecological conditions (two eco-regions), in an arid region of central-western of Argentina. We determined: a) abundance of culturable nitrifier bacteria, b) nitrification activity and efficiency, and c) nitrifier community genetic structure by PCR-DGGE (richness and similarity index). Grazing did not change the nitrifier abundance, activity and richness, while seasonally and eco-region effects were scarce. Contrarily, the habitat type affected nitrifier activity, which was higher in organic residues than in soil. All similarity indexes were low (average 0.50, range 0.76-0.18) which suggest high species diversity in these arid eco-regions. Our results indicate that the nitrification process in arid region of Argentina is redundant but it applies only for each habitat. To our knowledge, this is the first functional redundancy study on microbial ecological process in disturbed arid zones, in which we report an important species replacement but without modifications in microorganism abundance and activity.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.86 n.3 20132013-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000300009en10.4067/S0716-078X2013000300009
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	arid Chaco Monte desert PCR-DGGE similarity index species replacement
spellingShingle	arid Chaco Monte desert PCR-DGGE similarity index species replacement NOE,LAURA ABRIL,ADRIANA Is the nitrification a redundant process in arid regions?: activity, abundance and diversity of nitrifier microorganisms
description	We tested if the microbial functional redundancy concept (theory relating changes in ecosystem functioning by species loss) apply for changes in the ammonium-oxidizing community (nitrifier bacteria) due to: a) grazing disturbance, b) seasonal variations (dry season vs. wet season), c) habitat type (soil vs. organic residues), and d) ecological conditions (two eco-regions), in an arid region of central-western of Argentina. We determined: a) abundance of culturable nitrifier bacteria, b) nitrification activity and efficiency, and c) nitrifier community genetic structure by PCR-DGGE (richness and similarity index). Grazing did not change the nitrifier abundance, activity and richness, while seasonally and eco-region effects were scarce. Contrarily, the habitat type affected nitrifier activity, which was higher in organic residues than in soil. All similarity indexes were low (average 0.50, range 0.76-0.18) which suggest high species diversity in these arid eco-regions. Our results indicate that the nitrification process in arid region of Argentina is redundant but it applies only for each habitat. To our knowledge, this is the first functional redundancy study on microbial ecological process in disturbed arid zones, in which we report an important species replacement but without modifications in microorganism abundance and activity.
author	NOE,LAURA ABRIL,ADRIANA
author_facet	NOE,LAURA ABRIL,ADRIANA
author_sort	NOE,LAURA
title	Is the nitrification a redundant process in arid regions?: activity, abundance and diversity of nitrifier microorganisms
title_short	Is the nitrification a redundant process in arid regions?: activity, abundance and diversity of nitrifier microorganisms
title_full	Is the nitrification a redundant process in arid regions?: activity, abundance and diversity of nitrifier microorganisms
title_fullStr	Is the nitrification a redundant process in arid regions?: activity, abundance and diversity of nitrifier microorganisms
title_full_unstemmed	Is the nitrification a redundant process in arid regions?: activity, abundance and diversity of nitrifier microorganisms
title_sort	is the nitrification a redundant process in arid regions?: activity, abundance and diversity of nitrifier microorganisms
publisher	Sociedad de Biología de Chile
publishDate	2013
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000300009
work_keys_str_mv	AT noelaura isthenitrificationaredundantprocessinaridregionsactivityabundanceanddiversityofnitrifiermicroorganisms AT abriladriana isthenitrificationaredundantprocessinaridregionsactivityabundanceanddiversityofnitrifiermicroorganisms
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Is the nitrification a redundant process in arid regions?: activity, abundance and diversity of nitrifier microorganisms

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