Abordagens multivariadas no estudo da dinâmica de comunidades de macrófitas aquáticas
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://hdl.handle.net/11449/99931 |
Resumo: | The aquatic weeds are essentially important in water bodies under strong antropic influence, especially in hydropower water reservoirs built-up in highly urbanized regions. In the energy generation system of hydropower company Light Serviços de Eletricidade , the Santana reservoir historically has more problems with aquatic weeds. Aiming to solve these problems the company periodically promotes a mechanical harvesting cleaning up the reservoir, but after some time it is completely re-colonized by the macrophytes and the 4 problems are back. Aiming to understand the macrophytes re-colonization dynamics, fields surveys were done monthly, identifying and quantifying the aquatic weed populations in 91 sampling sites. The weeds quantification was done by means of a colonization scale changing from 0 (no plants) to 4 (high colonization, more than 80% of the sampling site). The evolution of colonization area and the geographic distribution pattern were studied for aquatic weed populations, while diversity and equitability coefficients, several similarity index and multivariate analysis were applied to study the macrophyte communities between sampling times. There was a well defined colonization succession process, characterized by variation in the relative size of the different populations and some seral stages could be established, at least for mechanical harvesting planning and some biotic conditions of the macrophyte community. It was not possible to detect a succession of populations, but a succession of colonization conditions since there were no expressive increments or extinctions of species in the reservoir during the year. The exotic species to the reservoir and with early colonization were the predominant ones in the macrophyte community with special attention to Egeria densa and Brachiaria arrecta. For some species, as Eichhornia crassipes and Myriophyllum aquaticum, the biotic pressures of natural enemies probably had decisive effects on. |
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Abordagens multivariadas no estudo da dinâmica de comunidades de macrófitas aquáticasErva daninhaPlantas aquaticasComunidadeAnalise multivariadaEcologia aquaticaAquatic macrophytesColonizationReservoirMultivariate analysesThe aquatic weeds are essentially important in water bodies under strong antropic influence, especially in hydropower water reservoirs built-up in highly urbanized regions. In the energy generation system of hydropower company Light Serviços de Eletricidade , the Santana reservoir historically has more problems with aquatic weeds. Aiming to solve these problems the company periodically promotes a mechanical harvesting cleaning up the reservoir, but after some time it is completely re-colonized by the macrophytes and the 4 problems are back. Aiming to understand the macrophytes re-colonization dynamics, fields surveys were done monthly, identifying and quantifying the aquatic weed populations in 91 sampling sites. The weeds quantification was done by means of a colonization scale changing from 0 (no plants) to 4 (high colonization, more than 80% of the sampling site). The evolution of colonization area and the geographic distribution pattern were studied for aquatic weed populations, while diversity and equitability coefficients, several similarity index and multivariate analysis were applied to study the macrophyte communities between sampling times. There was a well defined colonization succession process, characterized by variation in the relative size of the different populations and some seral stages could be established, at least for mechanical harvesting planning and some biotic conditions of the macrophyte community. It was not possible to detect a succession of populations, but a succession of colonization conditions since there were no expressive increments or extinctions of species in the reservoir during the year. The exotic species to the reservoir and with early colonization were the predominant ones in the macrophyte community with special attention to Egeria densa and Brachiaria arrecta. For some species, as Eichhornia crassipes and Myriophyllum aquaticum, the biotic pressures of natural enemies probably had decisive effects on.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Universidade Estadual Paulista (Unesp)Velini, Edivaldo Domingues [UNESP]Universidade Estadual Paulista (Unesp)Pitelli, Robinson Luiz de Campos Machado [UNESP]2014-06-11T19:30:24Z2014-06-11T19:30:24Z2006-09-04info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisiv, 60 f. : gráfs., tabs.application/pdfPITELLI, Robinson Luiz de Campos Machado. Abordagens multivariadas no estudo da dinâmica de comunidades de macrófitas aquáticas. 2006. iv, 60 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Ciências Agronômicas de Botucatu, 2006.http://hdl.handle.net/11449/99931000481266pitelli_rlcm_dr_fca.pdf33004064039P398554934481617020000-0003-0431-5942Alephreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporinfo:eu-repo/semantics/openAccess2024-05-02T19:50:06Zoai:repositorio.unesp.br:11449/99931Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-05-02T19:50:06Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Abordagens multivariadas no estudo da dinâmica de comunidades de macrófitas aquáticas |
title |
Abordagens multivariadas no estudo da dinâmica de comunidades de macrófitas aquáticas |
spellingShingle |
Abordagens multivariadas no estudo da dinâmica de comunidades de macrófitas aquáticas Pitelli, Robinson Luiz de Campos Machado [UNESP] Erva daninha Plantas aquaticas Comunidade Analise multivariada Ecologia aquatica Aquatic macrophytes Colonization Reservoir Multivariate analyses |
title_short |
Abordagens multivariadas no estudo da dinâmica de comunidades de macrófitas aquáticas |
title_full |
Abordagens multivariadas no estudo da dinâmica de comunidades de macrófitas aquáticas |
title_fullStr |
Abordagens multivariadas no estudo da dinâmica de comunidades de macrófitas aquáticas |
title_full_unstemmed |
Abordagens multivariadas no estudo da dinâmica de comunidades de macrófitas aquáticas |
title_sort |
Abordagens multivariadas no estudo da dinâmica de comunidades de macrófitas aquáticas |
author |
Pitelli, Robinson Luiz de Campos Machado [UNESP] |
author_facet |
Pitelli, Robinson Luiz de Campos Machado [UNESP] |
author_role |
author |
dc.contributor.none.fl_str_mv |
Velini, Edivaldo Domingues [UNESP] Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Pitelli, Robinson Luiz de Campos Machado [UNESP] |
dc.subject.por.fl_str_mv |
Erva daninha Plantas aquaticas Comunidade Analise multivariada Ecologia aquatica Aquatic macrophytes Colonization Reservoir Multivariate analyses |
topic |
Erva daninha Plantas aquaticas Comunidade Analise multivariada Ecologia aquatica Aquatic macrophytes Colonization Reservoir Multivariate analyses |
description |
The aquatic weeds are essentially important in water bodies under strong antropic influence, especially in hydropower water reservoirs built-up in highly urbanized regions. In the energy generation system of hydropower company Light Serviços de Eletricidade , the Santana reservoir historically has more problems with aquatic weeds. Aiming to solve these problems the company periodically promotes a mechanical harvesting cleaning up the reservoir, but after some time it is completely re-colonized by the macrophytes and the 4 problems are back. Aiming to understand the macrophytes re-colonization dynamics, fields surveys were done monthly, identifying and quantifying the aquatic weed populations in 91 sampling sites. The weeds quantification was done by means of a colonization scale changing from 0 (no plants) to 4 (high colonization, more than 80% of the sampling site). The evolution of colonization area and the geographic distribution pattern were studied for aquatic weed populations, while diversity and equitability coefficients, several similarity index and multivariate analysis were applied to study the macrophyte communities between sampling times. There was a well defined colonization succession process, characterized by variation in the relative size of the different populations and some seral stages could be established, at least for mechanical harvesting planning and some biotic conditions of the macrophyte community. It was not possible to detect a succession of populations, but a succession of colonization conditions since there were no expressive increments or extinctions of species in the reservoir during the year. The exotic species to the reservoir and with early colonization were the predominant ones in the macrophyte community with special attention to Egeria densa and Brachiaria arrecta. For some species, as Eichhornia crassipes and Myriophyllum aquaticum, the biotic pressures of natural enemies probably had decisive effects on. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006-09-04 2014-06-11T19:30:24Z 2014-06-11T19:30:24Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
PITELLI, Robinson Luiz de Campos Machado. Abordagens multivariadas no estudo da dinâmica de comunidades de macrófitas aquáticas. 2006. iv, 60 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Ciências Agronômicas de Botucatu, 2006. http://hdl.handle.net/11449/99931 000481266 pitelli_rlcm_dr_fca.pdf 33004064039P3 9855493448161702 0000-0003-0431-5942 |
identifier_str_mv |
PITELLI, Robinson Luiz de Campos Machado. Abordagens multivariadas no estudo da dinâmica de comunidades de macrófitas aquáticas. 2006. iv, 60 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Ciências Agronômicas de Botucatu, 2006. 000481266 pitelli_rlcm_dr_fca.pdf 33004064039P3 9855493448161702 0000-0003-0431-5942 |
url |
http://hdl.handle.net/11449/99931 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
iv, 60 f. : gráfs., tabs. application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
publisher.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.source.none.fl_str_mv |
Aleph reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1803650299213119488 |