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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

Geoqu?mica de sedimentos de fundo dos rios Trair?, Arar? e da Laguna N?sia Floresta (RN)

Lima, Luis Ferreira de 11 February 2006 (has links)
Made available in DSpace on 2014-12-17T15:19:58Z (GMT). No. of bitstreams: 1 LuizFL.pdf: 1831867 bytes, checksum: 040666e9d798b8a1891e7af5671e135c (MD5) Previous issue date: 2006-02-11 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The metal concentrations (Al, Ba, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Zn ) and phosforus(P) had been determined analyzed through Plasma Inductively Coupled Plasme Mass Spectrometer for fine fraction, < 0,63 mm in 22 samples. The sample preparation for analysis had been make in the laboratories of geology of the UFRN. This samples procedures consists in register, dry, bolt and send to analysis in external laboratory (LAKEFIELD GEOSOL) in Belo Horizonte (MG, Brazil). The studied area involves the rivers Trairi, Arar? and N?sia Floresta lagoon, that empties in the sea, situated in the Rio Grande do Norte State. The study objects (Rivers Trair?, Arar? and N?sia Floresta lagoon) receive influences from urban dumpies, agrotoxics and fertilizer, shrimps tank, pastoral, with this, the concentrations of metals (Al, Ba, Cd, Cr, Cu, Fe, Mn, Ni, Pb, P, Zn) (except phosforus) in some points of the study area had been above of the value of reference what it leads to classify them as not polluted to moderately polluted, as the calculated Igeo. In front of discussed, can say about the environmental problems found in Trairi, Arar? and N?sia Floresta Lagoon are still in small scale, since when regard the studied ?rea is over human activity effects / Foram determinadas as concentra??es dos metais (Al, Ba, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Zn ) e do fosf?ro (P) analisadas atrav?s de Espectr?metro de Massa com Plasma Indutivamente Acoplado para fra??o fina, < 0,063 mm, em 22 amostras. A prepara??o das amostras para an?lise foi realizada nos Laborat?rios de Geologia da UFRN e consistiu em cadastrar, secar, peneirar e enviar para an?lise em laborat?rio externo (LAKEFIELD GEOSOL), em Belo Horizonte (MG). A ?rea estudada corresponde aos rios Tra?ri, Arar? e lagoa N?sia Floresta, que des?guam no mar, situados no Estado do Rio Grande do Norte. Os objetos de estudo (Rios Trair?, Arar? e lagoa N?sia Floresta) recebem influ?ncias de lixos urbano, agrot?xicos e adubos, viveiros de camar?es e pastoril; com isto, as concentra??es destes metais em alguns pontos da ?rea de estudo ficaram acima do valor de refer?ncia classificando-os como n?o polu?dos a moderadamente polu?dos, conforme o Igeo calculado. Diante dos dados obtidos conclui-se que os problemas ambientais encontrados nos rios Tra?ri, Arar? e lagoa N?sia Floresta s?o ainda de pequena escala, mesmo quando se considera que na ?rea estudada a atividade humana ? intensa
2

Comportamento e ecologia ac?stica da baleia jubarte (Megaptera novaeangliae) na regi?o Nordeste do Brasil

Santos, Marcos Roberto Rossi 07 August 2012 (has links)
Made available in DSpace on 2014-12-17T15:36:39Z (GMT). No. of bitstreams: 1 MarcosRRS_TESE_2red.pdf: 2914202 bytes, checksum: 607aa226333ce661d0e57d380f43b9e9 (MD5) Previous issue date: 2012-08-07 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The acoustic ecology concept involve the relation between the live organisms and their sound environment and is applied in the present work to study the context in which the humpback whale (Megaptera novaeangliae) singing behavior, known as the most complex display in the nature, occurred in the northeastern Brazilian coast, outside the core area of Abrolhos Bank, between 2005 and 2010.I analyze the singer male occurrence , their spatial distribution and probable relations with oceanographic features, such as depth, tide regimen and moon phases. I also describe the acoustic structure and temporal variation of the singing behavior, based on song frequency and time measurements outside the Abrolhos Bank, and further compare the song complexity, registered in the same period, between Abrolhos Bank (16?- 19? S, 37?- 39? W) and the adjacent North Coast, herein considered from Itacar? (14? S, 38? W) to Aracaju (11? S, 37? W). Additionally, I look for describe and analyze anthropogenic noise sources in the marine environment of the study area, produced by the oil industry as well as by the whale watching operation, relating their frequencies to the acoustic niche utilized by the humpbacks. The results indicated a great plasticity in the singing behavior, evidenced by the occurrence of singer males in diverse social structures, from solitary individuals to other groups, even containing females and calves, as well as by the diversity which compound the song, when compared between two regions inside the same breeding area, which present distinct oceanographic characteristics. The singer male distribution may be related with the continental shelf extent along the study area. The anthropogenic noise presented frequency range, amplitude and sound intensity in potential to interfere acoustically in the singing behavior of the species, may resulting in disturbance during the breeding season in the Brazilian coast. Implications about the obtained results in the humpback whale mating system are discussed. In this way, I pretend to contribute with the acoustic ecology subject and provide information to subsidize humpback whale conservation / O conceito de ecologia ac?stica envolve a rela??o entre os organismos vivos e o seu ambiente sonoro e ? aplicado no presente trabalho para estudar o contexto no qual ocorreu o comportamento de canto da baleia jubarte (Megaptera novaeangliae), considerado o mais complexo comportamento reprodutivo (display) da natureza, na costa nordeste do Brasil, fora da concentra??o reprodutiva do Banco de Abrolhos, entre os anos de 2005 e 2010. Analiso a ocorr?ncia de machos cantores em diferentes estruturas de grupo, sua distribui??o espacial e prov?veis rela??es com fatores oceanogr?ficos, como profundidade, regime de mar?s e fases da lua. Tamb?m descrevo a estrutura ac?stica e a varia??o temporal do comportamento de canto, baseado em medi??es de frequ?ncia e tempo dos cantos, fora do Banco de Abrolhos, al?m de comparar a complexidade do canto, registrada no mesmo per?odo de estudo, entre o Banco de Abrolhos (16?- 19? S, 37?- 39? W), e a Costa Norte adjacente, aqui considerada desde Itacar? (14? S, 38? W) a Aracaj? (11? S, 37? W). Ainda busco descrever e analisar as fontes de ru?dos antropog?nicos no ambiente marinho da ?rea de estudo, produzidos pela atividade de explora??o de petroleo e g?s e tamb?m pelo turismo de observa??o de baleias, relacionando-os com o nicho ac?stico utilizado pela jubarte. Os resultados indicaram uma grande plasticidade no comportamento de canto, evidenciado pela ocorr?ncia dos cantores em diversas estruturas sociais, de indiv?duos solit?rios a grupos contendo outros animais, inclusive f?meas com filhotes, bem como pela diversidade que comp?e o canto da esp?cie, quando comparado entre duas regi?es dentro da mesma ?rea de reprodu??o, como o Banco de Abrolhos e a Costa Norte, que apresenta caracter?sticas oceanogr?ficas distintas. A distribui??o dos machos cantores parece estar relacionada com a extens?o da plataforma continental na ?rea de estudo. Os ru?dos antropog?nicos produzidos demonstraram uma faixa de frequ?ncias, amplitude sonora e intensidade capazes de interferir acusticamente no comportamento de canto da esp?cie, podendo resultar em dist?rbios durante o per?odo de reprodu??o da esp?cie na costa brasileira. Implica??es sobre os resultados obtidos na teoria do sistema de acasamento da esp?cie s?o discutidas. Dessa forma, pretendo contribuir com o tema da ecologia acustica e gerar informa??es que subsidiem a conserva??o da baleia jubarte

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