Organic matter characterization and decomposition dynamics in sub-Antarctic streams impacted by invasive beavers

Despite being a relatively remote and well conserved area, the sub-Antarctic ecoregion faces pressing global threats from climate change, the ozone hole and introduced species. Its freshwater ecosystems are one of the least studied components of this biome, but they are known to confront a host of i...

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Autores principales:	Ulloa,Erica, Anderson,Christopher B, Ardón,Marcelo, Murcia,Silvia, Valenzuela,Alejandro E.J
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2012
Materias:	Castor canadensis carbon cycle decay rate decomposition leaf packs Nothofagus
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2012000400006
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spelling	oai:scielo:S0718-560X20120004000062013-04-12Organic matter characterization and decomposition dynamics in sub-Antarctic streams impacted by invasive beaversUlloa,EricaAnderson,Christopher BArdón,MarceloMurcia,SilviaValenzuela,Alejandro E.J Castor canadensis carbon cycle decay rate decomposition leaf packs Nothofagus Despite being a relatively remote and well conserved area, the sub-Antarctic ecoregion faces pressing global threats from climate change, the ozone hole and introduced species. Its freshwater ecosystems are one of the least studied components of this biome, but they are known to confront a host of invasive taxa including trout and beavers. We set out to understand the basic characterization and dynamics of organic matter processing and decomposition in sub-Antarctic streams under natural forest (NF) conditions and in ponds constructed by North American beavers (Castor canadensis) (BP). We found these streams have a naturally stable benthic organic matter regime throughout the year with a peak in leaf input from Nothofagus pumilio in autumn. Beaver ponds significantly increased the retention of organic matter and caused significantly higher decomposition rates, probably associated with increased density and biomass of Hyalella spp. As expected, leaf decay rates for N. pumilio, a deciduous species, were higher (NF: -0.0028 day- ± 0.0001 SE; BP: -0.0118 day-1 ± 0.0009 SE) than N. betuloides (a broad-leaf evergreen) (NF: -0.0018 day-1 ± 0.0005 SE; BP: -0.0040 day-1 ± 0.0003 SE). Overall these results indicate that the naturally low decomposition rates (slower than 89% of a global survey of decay rates) for these cold, oligotrophic streams are being modified by introduced beavers to resemble more temperate latitudes.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.40 n.4 20122012-11-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2012000400006en10.3856/vol40-issue4-fulltext-6
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Castor canadensis carbon cycle decay rate decomposition leaf packs Nothofagus
spellingShingle	Castor canadensis carbon cycle decay rate decomposition leaf packs Nothofagus Ulloa,Erica Anderson,Christopher B Ardón,Marcelo Murcia,Silvia Valenzuela,Alejandro E.J Organic matter characterization and decomposition dynamics in sub-Antarctic streams impacted by invasive beavers
description	Despite being a relatively remote and well conserved area, the sub-Antarctic ecoregion faces pressing global threats from climate change, the ozone hole and introduced species. Its freshwater ecosystems are one of the least studied components of this biome, but they are known to confront a host of invasive taxa including trout and beavers. We set out to understand the basic characterization and dynamics of organic matter processing and decomposition in sub-Antarctic streams under natural forest (NF) conditions and in ponds constructed by North American beavers (Castor canadensis) (BP). We found these streams have a naturally stable benthic organic matter regime throughout the year with a peak in leaf input from Nothofagus pumilio in autumn. Beaver ponds significantly increased the retention of organic matter and caused significantly higher decomposition rates, probably associated with increased density and biomass of Hyalella spp. As expected, leaf decay rates for N. pumilio, a deciduous species, were higher (NF: -0.0028 day- ± 0.0001 SE; BP: -0.0118 day-1 ± 0.0009 SE) than N. betuloides (a broad-leaf evergreen) (NF: -0.0018 day-1 ± 0.0005 SE; BP: -0.0040 day-1 ± 0.0003 SE). Overall these results indicate that the naturally low decomposition rates (slower than 89% of a global survey of decay rates) for these cold, oligotrophic streams are being modified by introduced beavers to resemble more temperate latitudes.
author	Ulloa,Erica Anderson,Christopher B Ardón,Marcelo Murcia,Silvia Valenzuela,Alejandro E.J
author_facet	Ulloa,Erica Anderson,Christopher B Ardón,Marcelo Murcia,Silvia Valenzuela,Alejandro E.J
author_sort	Ulloa,Erica
title	Organic matter characterization and decomposition dynamics in sub-Antarctic streams impacted by invasive beavers
title_short	Organic matter characterization and decomposition dynamics in sub-Antarctic streams impacted by invasive beavers
title_full	Organic matter characterization and decomposition dynamics in sub-Antarctic streams impacted by invasive beavers
title_fullStr	Organic matter characterization and decomposition dynamics in sub-Antarctic streams impacted by invasive beavers
title_full_unstemmed	Organic matter characterization and decomposition dynamics in sub-Antarctic streams impacted by invasive beavers
title_sort	organic matter characterization and decomposition dynamics in sub-antarctic streams impacted by invasive beavers
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2012
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2012000400006
work_keys_str_mv	AT ulloaerica organicmattercharacterizationanddecompositiondynamicsinsubantarcticstreamsimpactedbyinvasivebeavers AT andersonchristopherb organicmattercharacterizationanddecompositiondynamicsinsubantarcticstreamsimpactedbyinvasivebeavers AT ardonmarcelo organicmattercharacterizationanddecompositiondynamicsinsubantarcticstreamsimpactedbyinvasivebeavers AT murciasilvia organicmattercharacterizationanddecompositiondynamicsinsubantarcticstreamsimpactedbyinvasivebeavers AT valenzuelaalejandroej organicmattercharacterizationanddecompositiondynamicsinsubantarcticstreamsimpactedbyinvasivebeavers
_version_	1714205099647041536

Organic matter characterization and decomposition dynamics in sub-Antarctic streams impacted by invasive beavers

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