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metadata.dc.type: Dissertação
Título: Estudo da sensibilidade e tolerância ao aumento da concentração de nutrientes em larvas de corais
Título(s) alternativo(s): Study of sensitivity and tolerance to increased nutrient concentration in coral larvae
metadata.dc.creator: Silva, Andressa Tavares
metadata.dc.contributor.advisor1: Silva, Allison Gonçalves
metadata.dc.contributor.advisor-co1: Hackradt, Fabiana Cezar Félix
metadata.dc.contributor.referee1: Marangoni, Laura Fernandes de Barros
metadata.dc.contributor.referee2: Bandeira, Marcus Luciano Souza de Ferreira
metadata.dc.contributor.referee3: Sasaki, Silvio Tarou
metadata.dc.description.resumo: Os corais são organismos sensíveis às mudanças climáticas. Aumento na temperatura e na concentração de nutrientes, efeitos de impacto local e global podem provocar diversas disfunções nestes animais, comprometendo todo o ecossistema recifal. O objetivo deste trabalho foi estudar os efeitos do aumento de nutrientes e de temperatura em larvas de corais. Foi realizado um estudo bibliográfico a fim de observar as respostas à estressores ambientais em outros locais do mundo; em seguida analisou-se nitrato, nitrito, amônio, fosfato e clorofila a de amostras de aguas de poças ao longo do recife de Coroa Vermelha e posterior simulação dos valores mínimo e máximo dos nutrientes encontrados nas poças em larvas do coral Agaricia humilis em diferentes temperaturas. Por fim foi realizada a análise de peroxidação lipídica a fim de buscar evidencias de estresse oxidativo nas larvas. Observou-se que os nutrientes nitrogenados, 46 μmol L-1, para amônia e 8,5 μmol L-1, para o nitrato, e a clorofila a apresentaram altos valores no período seco (verão), devido provavelmente ao aumento do aporte continental nesta época do ano, devido ao aumento do turismo na região. As larvas submetidas aos tratamentos na temperatura mais alta (32º) apresentaram as maiores taxas de mortalidade, cerca de 78% e as maiores taxas de estresse oxidativo ocorreram nas larvas sobreviventes que foram submetidas aos tratamentos de baixa temperatura e maiores concentrações de nutrientes. Os resultados apontados neste trabalho demonstram a importância do monitoramento de corais para avaliação dos efeitos de estressores ambientais nos recifes. Foi evidenciado que o aumento de temperatura nos oceanos pode aumentar as taxas de mortalidade nos corais, enquanto o aumento de nutrientes, ainda que em temperaturas mais brandas (26ºC) pode provocar estresse oxidativo.
Resumo: Corals are organisms sensitive to climate change. Increase in temperature and nutrient concentration, local and global impact effects can cause several dysfunctions in these animals, compromising the entire reef ecosystem. The objective of this work was to study the effects of increased nutrients and temperature on coral larvae. A study was carried out bibliographic in order to observe responses to environmental stressors in other parts of the world; in Then, nitrate, nitrite, ammonium, phosphate and chlorophyll a from samples of water from puddles were analyzed. along the Coroa Vermelha reef and subsequent simulation of the minimum and maximum values ​​of the nutrients found in pools in Agaricia humilis coral larvae at different temperatures. Finally, the analysis of lipid peroxidation was performed in order to seek evidence of stress. oxidative in the larvae. It was observed that the nitrogen nutrients, 46 μmol L-1, for ammonia and 8.5 μmol L-1, for nitrate, and chlorophyll a showed high values ​​in the dry period (summer), due to probably due to the increase in the continental contribution at this time of year, due to the increase in tourism in the region. The larvae submitted to the treatments at the highest temperature (32º) presented the highest mortality rates, about 78% and the highest rates of oxidative stress occurred in surviving larvae that were submitted to low temperature treatments and higher nutrient concentrations. The results indicated in this work demonstrate the importance of coral monitoring to assess the effects of environmental stressors on reefs. He was evidence that the increase in temperature in the oceans can increase mortality rates in corals, while the increase in nutrients, even at milder temperatures (26ºC) can cause oxidative stress.
Palavras-chave: Agaricia humilis
Agaricia humilis
Ecossistemas recifais
Reef ecosystems
Espécies reativas de oxigênio
Reactive species of oxygen
Defesas antioxidantes
Antioxidant defenses
LPO
LPO
metadata.dc.subject.cnpq: CNPQ::CIENCIAS BIOLOGICAS::ECOLOGIA
metadata.dc.language: por
metadata.dc.publisher.country: Brasil
Editor: Instituto Brasileiro de Informação em Ciência e Tecnologia
metadata.dc.publisher.initials: IFBA
metadata.dc.publisher.department: Programa Pós-Graduação em Ciências e Tecnologias Ambientais (PPGCTA)
metadata.dc.publisher.program: Mestrado em Ciências e Tecnologias Ambientais (PPGCTA)
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metadata.dc.rights: Acesso Aberto
URI: https://repositorio.ifba.edu.br/jspui/handle/123456789/188
Data do documento: 30-Abr-2019
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