Don't camp beside the river: structure and dynamics of Andean alder (Alnus acuminata) forests affected by river floods, northwestern Argentina

Alnus acuminata (Betulaceae) is a pioneer tree that dominates mountain riparian forests throughout the eastern Andes. Early studies associated these forests with particular microclimatic conditions along river beds, but they were later linked to the periodical disturbance regime of mountain rivers....

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Autores principales:	EASDALE,TOMÁS A, SABATÉ,SEBASTIÁN, GRAU,ALFREDO
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2005
Materias:	Alnus acuminata river floods riparian forests forest dynamics El Niño/ENSO
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000400010
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spelling	oai:scielo:S0716-078X20050004000102006-03-16Don't camp beside the river: structure and dynamics of Andean alder (Alnus acuminata) forests affected by river floods, northwestern ArgentinaEASDALE,TOMÁS ASABATÉ,SEBASTIÁNGRAU,ALFREDO Alnus acuminata river floods riparian forests forest dynamics El Niño/ENSO Alnus acuminata (Betulaceae) is a pioneer tree that dominates mountain riparian forests throughout the eastern Andes. Early studies associated these forests with particular microclimatic conditions along river beds, but they were later linked to the periodical disturbance regime of mountain rivers. To understand the dynamics of these forests, we analysed tree age and spatial arrangement in two plots along Potrero river and another plot along La Horqueta river, Tucumán Province, north west Argentina. Through intensive tree coring and age reconstruction we identified similar-aged tree cohorts with maximum age ranges of eight years. Tree mapping and Moran's I spatial autocorrelation analysis showed that tree cohorts were spatially clumped, and provided further evidence that coetaneous patches of A. acuminata arise from massive regeneration following catastrophic flooding events. We tested the association between cohort initiation dates and regional maximum river discharge records by means of a randomization procedure and found weak evidence that establishment occurs after devastating floods, which eliminate previous vegetation and create bare sites suitable for A. acuminata regeneration. Dates of tree floodscars sampled along Potrero river precede by one year the most recent cohort initiation date and provide further support of this association. Although previous studies found a positive correlation between El Niño events and mean annual precipitation in northwestern Argentina, we did not detect an association between El Niño and annual maximum stream flow for rivers in Tucumán Province. Therefore, factors driving devastating floods and A. acuminata stand initiation require further studyinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.78 n.4 20052005-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000400010en10.4067/S0716-078X2005000400010
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Alnus acuminata river floods riparian forests forest dynamics El Niño/ENSO
spellingShingle	Alnus acuminata river floods riparian forests forest dynamics El Niño/ENSO EASDALE,TOMÁS A SABATÉ,SEBASTIÁN GRAU,ALFREDO Don't camp beside the river: structure and dynamics of Andean alder (Alnus acuminata) forests affected by river floods, northwestern Argentina
description	Alnus acuminata (Betulaceae) is a pioneer tree that dominates mountain riparian forests throughout the eastern Andes. Early studies associated these forests with particular microclimatic conditions along river beds, but they were later linked to the periodical disturbance regime of mountain rivers. To understand the dynamics of these forests, we analysed tree age and spatial arrangement in two plots along Potrero river and another plot along La Horqueta river, Tucumán Province, north west Argentina. Through intensive tree coring and age reconstruction we identified similar-aged tree cohorts with maximum age ranges of eight years. Tree mapping and Moran's I spatial autocorrelation analysis showed that tree cohorts were spatially clumped, and provided further evidence that coetaneous patches of A. acuminata arise from massive regeneration following catastrophic flooding events. We tested the association between cohort initiation dates and regional maximum river discharge records by means of a randomization procedure and found weak evidence that establishment occurs after devastating floods, which eliminate previous vegetation and create bare sites suitable for A. acuminata regeneration. Dates of tree floodscars sampled along Potrero river precede by one year the most recent cohort initiation date and provide further support of this association. Although previous studies found a positive correlation between El Niño events and mean annual precipitation in northwestern Argentina, we did not detect an association between El Niño and annual maximum stream flow for rivers in Tucumán Province. Therefore, factors driving devastating floods and A. acuminata stand initiation require further study
author	EASDALE,TOMÁS A SABATÉ,SEBASTIÁN GRAU,ALFREDO
author_facet	EASDALE,TOMÁS A SABATÉ,SEBASTIÁN GRAU,ALFREDO
author_sort	EASDALE,TOMÁS A
title	Don't camp beside the river: structure and dynamics of Andean alder (Alnus acuminata) forests affected by river floods, northwestern Argentina
title_short	Don't camp beside the river: structure and dynamics of Andean alder (Alnus acuminata) forests affected by river floods, northwestern Argentina
title_full	Don't camp beside the river: structure and dynamics of Andean alder (Alnus acuminata) forests affected by river floods, northwestern Argentina
title_fullStr	Don't camp beside the river: structure and dynamics of Andean alder (Alnus acuminata) forests affected by river floods, northwestern Argentina
title_full_unstemmed	Don't camp beside the river: structure and dynamics of Andean alder (Alnus acuminata) forests affected by river floods, northwestern Argentina
title_sort	don't camp beside the river: structure and dynamics of andean alder (alnus acuminata) forests affected by river floods, northwestern argentina
publisher	Sociedad de Biología de Chile
publishDate	2005
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000400010
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Don't camp beside the river: structure and dynamics of Andean alder (Alnus acuminata) forests affected by river floods, northwestern Argentina

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