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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Evolução paleoambiental em salinas da Nhecolândia no holoceno superior, Pantanal sul-matogrossense

Becker, Bárbara Fernandes 25 March 2014 (has links)
Submitted by Simone Souza (simonecgsouza@hotmail.com) on 2017-11-07T13:33:04Z No. of bitstreams: 1 DISS_2014_Bárbara Fernandes Becker.pdf: 3053917 bytes, checksum: 060aed2f62884ff0f96ff9c066cf46de (MD5) / Approved for entry into archive by Jordan (jordanbiblio@gmail.com) on 2018-02-02T15:19:28Z (GMT) No. of bitstreams: 1 DISS_2014_Bárbara Fernandes Becker.pdf: 3053917 bytes, checksum: 060aed2f62884ff0f96ff9c066cf46de (MD5) / Made available in DSpace on 2018-02-02T15:19:28Z (GMT). No. of bitstreams: 1 DISS_2014_Bárbara Fernandes Becker.pdf: 3053917 bytes, checksum: 060aed2f62884ff0f96ff9c066cf46de (MD5) Previous issue date: 2014-03-25 / CAPES / A região de Nhecolândia possui uma paisagem distinta quando comparadas às outras regiões do Pantanal, pois comporta áreas de lagoas limitadas por cordilheiras, faixas de areia, e que podem estar interligadas por vazantes. Algumas dessas lagoas possuem índices de salinidade podendo chegar até hipersalino. Acredita-se que a origem desses lagos tenha sido nos últimos cinco mil anos. Aqui, apresentam-se análises palinológicas e de geoquímica orgânica de sedimentos coletadas em duas lagoas salinas na região de Nhecolândia, MS. Os dados indicam que há 3.410 +/- 30 anos AP a vegetação em volta da lagoa foi composta por Bromeliaceae, Asteraceae, Arecaceae, Amaranthaceae e Nymphaceae. Registros de Cabomba sp. há 2.300 anos AP mostram que os índices de salinidade ainda permitiam a existência de macrófitas aquáticas dentro da lagoa. A partir de cerca de 1.200 anos AP, aumento na quantidade de COT associados a grãos que indicam florestas sazonalmente inundáveis sugerem o estabelecimento de vegetação semelhante à atual. / The region of Nhecolândia has a distinct landscape when compared to other Pantanal regions since it bears areas with ponds limited by Cordilheira forest, sand stripes and that may be connected by ebb tides. Some of these pounds have salinity indexes that may reach the hyper-salinity. It is believed that the origin of these lakes was in the last 5 thousand years. Here, it is presented palinological and organic geochemistry analysis of sediments collected at two saline pounds at the region of Nhecolância, MS. The obtained data indicate that at 3.410 years BP the vegetation surrounding the pound was composed by Bromeliaceae, Asteraceae, Arecaceae, Amarantaceae and Nymphaceae. Registers of Cabomba sp. at 2.300 years BP show that the salinity indexes still allow the existence of macrophytes inside the pound. Beyond 1.200 years BP, the increasing in the quantity of COT associated to grains that indicate seasonal floodable forests, suggest the establishing of vegetation similar to the current one.

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