Changes of sub-fossil chironomid assemblages associated with volcanic sediment deposition in an Andean lake (38°S), Chile

Chironomid assemblages and sedimentological parameters (grain size, organic content, mineralogy) of a short sediment core from Lake Galletué (38°41' S, 71°17' W) were analysed. The sedimentary record includes one volcanic ash (tephra) layer, which has a completely different composition tha...

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Autores principales:	ARANEDA,ALBERTO, CRUCES,FABIOLA, TORRES,LAURA, BERTRAND,SEBASTIEN, FAGEL,NATHALIE, TREUTLER,HANS C, CHIRINOS,LUIS, BARRA,RICARDO, URRUTIA,ROBERTO
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2007
Materias:	chironomids lake sediments tephra layer southern Chile
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000200002
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spelling	oai:scielo:S0716-078X20070002000022007-08-28Changes of sub-fossil chironomid assemblages associated with volcanic sediment deposition in an Andean lake (38°S), ChileARANEDA,ALBERTOCRUCES,FABIOLATORRES,LAURABERTRAND,SEBASTIENFAGEL,NATHALIETREUTLER,HANS CCHIRINOS,LUISBARRA,RICARDOURRUTIA,ROBERTO chironomids lake sediments tephra layer southern Chile Chironomid assemblages and sedimentological parameters (grain size, organic content, mineralogy) of a short sediment core from Lake Galletué (38°41' S, 71°17' W) were analysed. The sedimentary record includes one volcanic ash (tephra) layer, which has a completely different composition than the host sediment in terms of organic content, grain size, and mineralogy. According to the geochronology (210Pb and 137Cs), this ash layer corresponds to the eruption of Llaima Volcano in 1956-1957. The tephra deposition had an impact on chironomid assemblages producing, among other changes, an increase in Parakiefferiella and a decrease in Ablabesmyia, although no noticeable change was detected in the diversity index. When compared with other studies, our results also show an impact in terms of the presence of chironomid head capsules within the tephra. The presence of these head capsules could result from the effects of percolation, since the coarse grain size of the tephra particles provides large interstitial spaces. The recovery in the abundances of some taxa after the tephra input, suggests the lake is probably restoring the conditions prevailing before the tephra fallinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.80 n.2 20072007-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000200002en10.4067/S0716-078X2007000200002
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	chironomids lake sediments tephra layer southern Chile
spellingShingle	chironomids lake sediments tephra layer southern Chile ARANEDA,ALBERTO CRUCES,FABIOLA TORRES,LAURA BERTRAND,SEBASTIEN FAGEL,NATHALIE TREUTLER,HANS C CHIRINOS,LUIS BARRA,RICARDO URRUTIA,ROBERTO Changes of sub-fossil chironomid assemblages associated with volcanic sediment deposition in an Andean lake (38°S), Chile
description	Chironomid assemblages and sedimentological parameters (grain size, organic content, mineralogy) of a short sediment core from Lake Galletué (38°41' S, 71°17' W) were analysed. The sedimentary record includes one volcanic ash (tephra) layer, which has a completely different composition than the host sediment in terms of organic content, grain size, and mineralogy. According to the geochronology (210Pb and 137Cs), this ash layer corresponds to the eruption of Llaima Volcano in 1956-1957. The tephra deposition had an impact on chironomid assemblages producing, among other changes, an increase in Parakiefferiella and a decrease in Ablabesmyia, although no noticeable change was detected in the diversity index. When compared with other studies, our results also show an impact in terms of the presence of chironomid head capsules within the tephra. The presence of these head capsules could result from the effects of percolation, since the coarse grain size of the tephra particles provides large interstitial spaces. The recovery in the abundances of some taxa after the tephra input, suggests the lake is probably restoring the conditions prevailing before the tephra fall
author	ARANEDA,ALBERTO CRUCES,FABIOLA TORRES,LAURA BERTRAND,SEBASTIEN FAGEL,NATHALIE TREUTLER,HANS C CHIRINOS,LUIS BARRA,RICARDO URRUTIA,ROBERTO
author_facet	ARANEDA,ALBERTO CRUCES,FABIOLA TORRES,LAURA BERTRAND,SEBASTIEN FAGEL,NATHALIE TREUTLER,HANS C CHIRINOS,LUIS BARRA,RICARDO URRUTIA,ROBERTO
author_sort	ARANEDA,ALBERTO
title	Changes of sub-fossil chironomid assemblages associated with volcanic sediment deposition in an Andean lake (38°S), Chile
title_short	Changes of sub-fossil chironomid assemblages associated with volcanic sediment deposition in an Andean lake (38°S), Chile
title_full	Changes of sub-fossil chironomid assemblages associated with volcanic sediment deposition in an Andean lake (38°S), Chile
title_fullStr	Changes of sub-fossil chironomid assemblages associated with volcanic sediment deposition in an Andean lake (38°S), Chile
title_full_unstemmed	Changes of sub-fossil chironomid assemblages associated with volcanic sediment deposition in an Andean lake (38°S), Chile
title_sort	changes of sub-fossil chironomid assemblages associated with volcanic sediment deposition in an andean lake (38°s), chile
publisher	Sociedad de Biología de Chile
publishDate	2007
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000200002
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Changes of sub-fossil chironomid assemblages associated with volcanic sediment deposition in an Andean lake (38°S), Chile

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