Reach scale ecologic influence of in-stream large wood in a Coastal Mountain range channel, Southern Chile

The ecologic influence of in-stream large wood (LW) was evaluated at reach scale in a third-order channel located in the Coastal Mountain Range, southern Chile. The tested hypotheses were that Coarse Particle Organic Matter (CPOM) retention is higher and benthic macro-invertebrates are more diverse...

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Autores principales:	VERA,MACARENA, JARA,CARLOS, IROUMÉ,ANDRÉS, ULLOA,HÉCTOR, ANDREOLI,ANDREA, BARRIENTOS,SEBASTIÁN
Lenguaje:	English
Publicado:	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción 2014
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000200002
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spelling	oai:scielo:S0717-653820140002000022015-01-23Reach scale ecologic influence of in-stream large wood in a Coastal Mountain range channel, Southern ChileVERA,MACARENAJARA,CARLOSIROUMÉ,ANDRÉSULLOA,HÉCTORANDREOLI,ANDREABARRIENTOS,SEBASTIÁN The ecologic influence of in-stream large wood (LW) was evaluated at reach scale in a third-order channel located in the Coastal Mountain Range, southern Chile. The tested hypotheses were that Coarse Particle Organic Matter (CPOM) retention is higher and benthic macro-invertebrates are more diverse in channel reaches storing higher volumes of LW. Three LW-low-volume reaches (mean LW volume of 8 m³ 100m-1 of reach channel length; plane bed morphology) and three LW-high-volume reaches (mean volume 262 m³ 100m-1; forced pool riffle bed morphology) were selected within a 1557 m-long segment of the study channel. CPOM retention was inferred from the difference between the number of leaves collected in the downstream end of each reach and the leaves introduced in the upstream end. Mean CPOM retention was 72 and 90% among LW-low and high volume reaches, and showed a positive correlation (R = 0.61) with LW volume. Macro-invertebrates were more diverse and abundant in LW-high-volume reaches and the richness was twice than in LW-low-volume reaches. Bray-Curtis similarity index was low (40%) between LW-high and low volume reaches, while it was high (> 60%) among LW-low-volume reaches. Results confirm the hypothesis that OM retention and benthic macro-invertebrate diversity and abundance were higher in high LW volume reaches. The higher diversity and abundance of macro-invertebrates associated with LW accumulations confirm that logjams constitute a biotope that offers shelter and food. These results can guide the assessment of environmental impacts of stream intervention and restoration projects. The study was undertaken within the framework of Project Fondecyt 1110609.info:eu-repo/semantics/openAccessFacultad de Ciencias Naturales y Oceanográficas, Universidad de ConcepciónGayana (Concepción) v.78 n.2 20142014-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000200002en10.4067/S0717-65382014000200002
institution	Scielo Chile
collection	Scielo Chile
language	English
description	The ecologic influence of in-stream large wood (LW) was evaluated at reach scale in a third-order channel located in the Coastal Mountain Range, southern Chile. The tested hypotheses were that Coarse Particle Organic Matter (CPOM) retention is higher and benthic macro-invertebrates are more diverse in channel reaches storing higher volumes of LW. Three LW-low-volume reaches (mean LW volume of 8 m³ 100m-1 of reach channel length; plane bed morphology) and three LW-high-volume reaches (mean volume 262 m³ 100m-1; forced pool riffle bed morphology) were selected within a 1557 m-long segment of the study channel. CPOM retention was inferred from the difference between the number of leaves collected in the downstream end of each reach and the leaves introduced in the upstream end. Mean CPOM retention was 72 and 90% among LW-low and high volume reaches, and showed a positive correlation (R = 0.61) with LW volume. Macro-invertebrates were more diverse and abundant in LW-high-volume reaches and the richness was twice than in LW-low-volume reaches. Bray-Curtis similarity index was low (40%) between LW-high and low volume reaches, while it was high (> 60%) among LW-low-volume reaches. Results confirm the hypothesis that OM retention and benthic macro-invertebrate diversity and abundance were higher in high LW volume reaches. The higher diversity and abundance of macro-invertebrates associated with LW accumulations confirm that logjams constitute a biotope that offers shelter and food. These results can guide the assessment of environmental impacts of stream intervention and restoration projects. The study was undertaken within the framework of Project Fondecyt 1110609.
author	VERA,MACARENA JARA,CARLOS IROUMÉ,ANDRÉS ULLOA,HÉCTOR ANDREOLI,ANDREA BARRIENTOS,SEBASTIÁN
spellingShingle	VERA,MACARENA JARA,CARLOS IROUMÉ,ANDRÉS ULLOA,HÉCTOR ANDREOLI,ANDREA BARRIENTOS,SEBASTIÁN Reach scale ecologic influence of in-stream large wood in a Coastal Mountain range channel, Southern Chile
author_facet	VERA,MACARENA JARA,CARLOS IROUMÉ,ANDRÉS ULLOA,HÉCTOR ANDREOLI,ANDREA BARRIENTOS,SEBASTIÁN
author_sort	VERA,MACARENA
title	Reach scale ecologic influence of in-stream large wood in a Coastal Mountain range channel, Southern Chile
title_short	Reach scale ecologic influence of in-stream large wood in a Coastal Mountain range channel, Southern Chile
title_full	Reach scale ecologic influence of in-stream large wood in a Coastal Mountain range channel, Southern Chile
title_fullStr	Reach scale ecologic influence of in-stream large wood in a Coastal Mountain range channel, Southern Chile
title_full_unstemmed	Reach scale ecologic influence of in-stream large wood in a Coastal Mountain range channel, Southern Chile
title_sort	reach scale ecologic influence of in-stream large wood in a coastal mountain range channel, southern chile
publisher	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000200002
work_keys_str_mv	AT veramacarena reachscaleecologicinfluenceofinstreamlargewoodinacoastalmountainrangechannelsouthernchile AT jaracarlos reachscaleecologicinfluenceofinstreamlargewoodinacoastalmountainrangechannelsouthernchile AT iroumeandres reachscaleecologicinfluenceofinstreamlargewoodinacoastalmountainrangechannelsouthernchile AT ulloahector reachscaleecologicinfluenceofinstreamlargewoodinacoastalmountainrangechannelsouthernchile AT andreoliandrea reachscaleecologicinfluenceofinstreamlargewoodinacoastalmountainrangechannelsouthernchile AT barrientossebastian reachscaleecologicinfluenceofinstreamlargewoodinacoastalmountainrangechannelsouthernchile
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Reach scale ecologic influence of in-stream large wood in a Coastal Mountain range channel, Southern Chile

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