Article (Scientific journals)
Changes in diatom assemblages in an Andean lake in response to a recent volcanic event
Cruces, Fabiola; Urrutia, Roberto; Parra, Oscar et al.
2006In Archiv für Hydrobiologie, 165 (1), p. 23-35
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Keywords :
diatoms; tephra; sediment; species composition; Andean lake
Abstract :
[en] Galletue Lake (38 degrees 41'S; 71 degrees 17'W, IX Region-Chile) is located in an area that is highly influenced by eruptive activity of the Lonquimay and Llaima volcanoes. As a consequence, during the last century tephra was deposited into the lake. Sedimentary diatom assemblages were reconstructed in order to establish the tephra effect on their composition and productivity. This was done by taking a sediment core from Galletue Lake at 40 m depth and sectioning it in 1 cm intervals. The core age was obtained with Pb-210 and Cs-137 activities and the mineral composition of the tephra was determined with mineralogical analyses. Furthermore, sedimentological analyses were performed and total organic matter was determined in the profile. The diatom assemblages were analysed using light and electronic microscopy. The results showed that the diatom stratigraphy can be separated in three zones recognizing the periods before and after tephra input. Aulacoseira granulata decreased during the tephra influx and was replaced by Cyclotella aff. glomerata. When the tephra disappeared from the sedimentary record, A. granulata returned to pre-volcanic event levels. At the same time, Cyclotella aff. glomerata decreased within the assemblages. Asterionella formosa and Urosolenia eriensis increased after the tephra input, with values surpassing earlier ones. These results indicate that, after the tephra input, the lake recovered its previous nutrient levels, which agrees with the organic matter content in the sedimentary matrix. Finally, the results reveal that the volcanic disturbance changed the structure and productivity of diatom assemblages in Galletue Lake.
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Cruces, Fabiola
Urrutia, Roberto
Parra, Oscar
Araneda, Alberto
Treutler, H.
Bertrand, Sébastien
Fagel, Nathalie  ;  Université de Liège - ULiège > Département de géologie > Géochim. sédiment. - Sédiment. mar. & continent. du quatern.
Torres, Laura
Barra, Ricardo
Chirinos, Luis
Language :
English
Title :
Changes in diatom assemblages in an Andean lake in response to a recent volcanic event
Publication date :
January 2006
Journal title :
Archiv für Hydrobiologie
ISSN :
0003-9136
Publisher :
E Schweizerbartsche Verlags, Stuttgart, Germany
Volume :
165
Issue :
1
Pages :
23-35
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Enso-Chile
Funders :
SSTC - Services Fédéraux des Affaires Scientifiques, Techniques et Culturelles [BE]
Available on ORBi :
since 16 September 2009

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