Pollen and microalgae in sediments at southern margin of Colhue Huapi Lake, Chubut; Argentina. An insight to among shore comparison

Abstract A soil profile from the southern margin of Colhue Huapi Lake, at La Campanita site (45°38’ S, 68°37’ W), was analysed for pollen and algae content to know the past vegetation communities and to infer changes in lake water level occurred during the Late Holocene. Samples...

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Autores principales:	Fabiani,Ana C., Burry,Lidia S., Escalante,Alicia H.
Lenguaje:	English
Publicado:	Universidad de Magallanes 2014
Materias:	Pollen NPP Holocene Colhue Huapi Lake lake water level shore comparison
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-686X2014000100003
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spelling	oai:scielo:S0718-686X20140001000032018-09-06Pollen and microalgae in sediments at southern margin of Colhue Huapi Lake, Chubut; Argentina. An insight to among shore comparisonFabiani,Ana C.Burry,Lidia S.Escalante,Alicia H. Pollen NPP Holocene Colhue Huapi Lake lake water level shore comparison Abstract A soil profile from the southern margin of Colhue Huapi Lake, at La Campanita site (45°38’ S, 68°37’ W), was analysed for pollen and algae content to know the past vegetation communities and to infer changes in lake water level occurred during the Late Holocene. Samples were dated by AMS 14C methods. Radiocarbon ages were of 1711 ± 35 14C yr BP at the base, 95cm depth, and another of 979 ± 42 14C yr BP at 40cm depth. The record was dominated by no arboreal taxa, Chenopodiaceae being the principal shrub taxon and Cyperaceae the herbaceous one. Changes in the pollen record occurred mainly at a local scale and few differences were observed in the input of regional and extra regional pollen. From 1711 ± 35 14C yr BP until ca. 1212 yr BP, a high lake water level was indicated by the low representation of Cyperaceae associated with few shallow areas available to be colonized and high percentages of Pediastrum and Botryococcus algae. Between ca. 1212 and 414 yr BP a period of changes with several fluctuations in water depth developed. This trend would modify at 979 ± 42 14C yr BP with a decrease in the waters reflected by the expansion of Cyperaceae and algal reduction. From ca. 414 yr BP until 195 yr BP lake water level continued falling with a less fluctuating and net trend as indicated by the highest percentage of Cyperaceae in the sequence and a low algal representation. The subsequent reduction in Cyperaceae percentage and the moderate increase in the algae would indicate a recovery of the lake water level for the last ca. 195 yr BP. Additionally La Campanita sequence was statistically compared with a sequence obtained from the north-western margin of the lake. Both sites registered a similar trend before 979 ± 42 14C yr BP.info:eu-repo/semantics/openAccessUniversidad de MagallanesAnales del Instituto de la Patagonia v.42 n.1 20142014-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-686X2014000100003en10.4067/S0718-686X2014000100003
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Pollen NPP Holocene Colhue Huapi Lake lake water level shore comparison
spellingShingle	Pollen NPP Holocene Colhue Huapi Lake lake water level shore comparison Fabiani,Ana C. Burry,Lidia S. Escalante,Alicia H. Pollen and microalgae in sediments at southern margin of Colhue Huapi Lake, Chubut; Argentina. An insight to among shore comparison
description	Abstract A soil profile from the southern margin of Colhue Huapi Lake, at La Campanita site (45°38’ S, 68°37’ W), was analysed for pollen and algae content to know the past vegetation communities and to infer changes in lake water level occurred during the Late Holocene. Samples were dated by AMS 14C methods. Radiocarbon ages were of 1711 ± 35 14C yr BP at the base, 95cm depth, and another of 979 ± 42 14C yr BP at 40cm depth. The record was dominated by no arboreal taxa, Chenopodiaceae being the principal shrub taxon and Cyperaceae the herbaceous one. Changes in the pollen record occurred mainly at a local scale and few differences were observed in the input of regional and extra regional pollen. From 1711 ± 35 14C yr BP until ca. 1212 yr BP, a high lake water level was indicated by the low representation of Cyperaceae associated with few shallow areas available to be colonized and high percentages of Pediastrum and Botryococcus algae. Between ca. 1212 and 414 yr BP a period of changes with several fluctuations in water depth developed. This trend would modify at 979 ± 42 14C yr BP with a decrease in the waters reflected by the expansion of Cyperaceae and algal reduction. From ca. 414 yr BP until 195 yr BP lake water level continued falling with a less fluctuating and net trend as indicated by the highest percentage of Cyperaceae in the sequence and a low algal representation. The subsequent reduction in Cyperaceae percentage and the moderate increase in the algae would indicate a recovery of the lake water level for the last ca. 195 yr BP. Additionally La Campanita sequence was statistically compared with a sequence obtained from the north-western margin of the lake. Both sites registered a similar trend before 979 ± 42 14C yr BP.
author	Fabiani,Ana C. Burry,Lidia S. Escalante,Alicia H.
author_facet	Fabiani,Ana C. Burry,Lidia S. Escalante,Alicia H.
author_sort	Fabiani,Ana C.
title	Pollen and microalgae in sediments at southern margin of Colhue Huapi Lake, Chubut; Argentina. An insight to among shore comparison
title_short	Pollen and microalgae in sediments at southern margin of Colhue Huapi Lake, Chubut; Argentina. An insight to among shore comparison
title_full	Pollen and microalgae in sediments at southern margin of Colhue Huapi Lake, Chubut; Argentina. An insight to among shore comparison
title_fullStr	Pollen and microalgae in sediments at southern margin of Colhue Huapi Lake, Chubut; Argentina. An insight to among shore comparison
title_full_unstemmed	Pollen and microalgae in sediments at southern margin of Colhue Huapi Lake, Chubut; Argentina. An insight to among shore comparison
title_sort	pollen and microalgae in sediments at southern margin of colhue huapi lake, chubut; argentina. an insight to among shore comparison
publisher	Universidad de Magallanes
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-686X2014000100003
work_keys_str_mv	AT fabianianac pollenandmicroalgaeinsedimentsatsouthernmarginofcolhuehuapilakechubutargentinaaninsighttoamongshorecomparison AT burrylidias pollenandmicroalgaeinsedimentsatsouthernmarginofcolhuehuapilakechubutargentinaaninsighttoamongshorecomparison AT escalantealiciah pollenandmicroalgaeinsedimentsatsouthernmarginofcolhuehuapilakechubutargentinaaninsighttoamongshorecomparison
_version_	1714205694126718976

Pollen and microalgae in sediments at southern margin of Colhue Huapi Lake, Chubut; Argentina. An insight to among shore comparison

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