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Toxicity of the Cypermethrin-Based Pesticide Barrage® to Larvae of Shrimp and Zebrafish = = Toxicidade do Barrage®, um pesticida a base de cipermetrina, em larvas de camaroes e peixe zebra.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Toxicity of the Cypermethrin-Based Pesticide Barrage® to Larvae of Shrimp and Zebrafish =/
其他題名:	Toxicidade do Barrage®, um pesticida a base de cipermetrina, em larvas de camaroes e peixe zebra.
作者:	Soares, Mayara Pereira.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	184 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-11, Section: B.
Contained By:	Dissertations Abstracts International81-11B.
標題:	Environmental health. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27933856
ISBN:	9781658480895

Toxicity of the Cypermethrin-Based Pesticide Barrage® to Larvae of Shrimp and Zebrafish = = Toxicidade do Barrage®, um pesticida a base de cipermetrina, em larvas de camaroes e peixe zebra.
Soares, Mayara Pereira.

Toxicity of the Cypermethrin-Based Pesticide Barrage® to Larvae of Shrimp and Zebrafish =Toxicidade do Barrage®, um pesticida a base de cipermetrina, em larvas de camaroes e peixe zebra. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 184 p.

Source: Dissertations Abstracts International, Volume: 81-11, Section: B.

Thesis (Ph.D.)--Universidade de Aveiro (Portugal), 2019.

This item must not be sold to any third party vendors.

The Pantanal (Brazil) is one of the largest wetlands in the world and is home to a considerable diversity of aquatic organisms. The region is based on a hydrological cycle where each year the rivers flood extensive areas and periods of drought return the water to the river beds, with important variations in the physicochemical properties of the water of rivers and lagoons. Associated with this it has been observed an increasing growth of agricultural and livestock activities that heavily depend on chemical products (pesticides) to ensure production in the region. The effects of these compounds on the environment, especially in water bodies, are not very well known. Thus, it is important to assess the effects of these compounds on aquatic fauna taking into consideration environmental variation (which can still be exacerbated in a climate change scenario). Therefore, the objective of this work was to evaluate the effects of Barrage®, a cypermethrin-based pesticide widely used in the region in shrimp species (one endemic to the Pantanal) and zebrafish model. In a first phase, effects of pH and nitrite concentrations variation in the toxicity of Barrage® were studied using larvae of Macrobrachium pantanalense, Macrobrachium amazonicum and Danio rerio. In a second phase, histological effects were studied in adults of M. pantanalense. Finally, larvae of Palaemons varians were tested as model for behavioral analysis (locomotion) and behavioral toxicity of Barrage® tested in this species and in D. rerio larvae. The results of this thesis confirm that pH and nitrite modify the toxicity of Barrage® to the tested species, mainly at sublethal level (larval growth and development). Results suggest that lethality may not be sufficient to correctly predict the combined effects of stressors and that inclusion of endemic species is crucial to the correct risk evaluation on sensitive biomas such as Pantanal. P. varians larvae revealed to be a good model for locomotor activity evaluation and were sensitive to the Barrage® effects confirming the usefulness of behavioral endpoints in the early detection of ecological risk and suggesting that shrimps as suitable models for behavioral ecotoxicology. At histological level, results show important changes in Pantanal shrimp gills, including relevant structural lesions that may affect the physiological function of these organisms. The results of this thesis contribute to a better understanding of the Barrage® effects in the development, behavior and histology of non-target organisms, also confirming the importance of the variation of environmental components in the toxicity of this compound. Data obtained are essential to raise awareness for the need of conducting systematic studies for accurately predicting ecological risks of the use of pesticides and establishing mitigation and environmental protection measures in Pantanal.

ISBN: 9781658480895Subjects--Topical Terms:

543032
Environmental health.
Subjects--Index Terms:

Ecotoxicology

Toxicity of the Cypermethrin-Based Pesticide Barrage® to Larvae of Shrimp and Zebrafish = = Toxicidade do Barrage®, um pesticida a base de cipermetrina, em larvas de camaroes e peixe zebra.
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245 1 0 $a Toxicity of the Cypermethrin-Based Pesticide Barrage® to Larvae of Shrimp and Zebrafish = $b Toxicidade do Barrage®, um pesticida a base de cipermetrina, em larvas de camaroes e peixe zebra.
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500 $a Source: Dissertations Abstracts International, Volume: 81-11, Section: B.
502 $a Thesis (Ph.D.)--Universidade de Aveiro (Portugal), 2019.
506 $a This item must not be sold to any third party vendors.
520 $a The Pantanal (Brazil) is one of the largest wetlands in the world and is home to a considerable diversity of aquatic organisms. The region is based on a hydrological cycle where each year the rivers flood extensive areas and periods of drought return the water to the river beds, with important variations in the physicochemical properties of the water of rivers and lagoons. Associated with this it has been observed an increasing growth of agricultural and livestock activities that heavily depend on chemical products (pesticides) to ensure production in the region. The effects of these compounds on the environment, especially in water bodies, are not very well known. Thus, it is important to assess the effects of these compounds on aquatic fauna taking into consideration environmental variation (which can still be exacerbated in a climate change scenario). Therefore, the objective of this work was to evaluate the effects of Barrage®, a cypermethrin-based pesticide widely used in the region in shrimp species (one endemic to the Pantanal) and zebrafish model. In a first phase, effects of pH and nitrite concentrations variation in the toxicity of Barrage® were studied using larvae of Macrobrachium pantanalense, Macrobrachium amazonicum and Danio rerio. In a second phase, histological effects were studied in adults of M. pantanalense. Finally, larvae of Palaemons varians were tested as model for behavioral analysis (locomotion) and behavioral toxicity of Barrage® tested in this species and in D. rerio larvae. The results of this thesis confirm that pH and nitrite modify the toxicity of Barrage® to the tested species, mainly at sublethal level (larval growth and development). Results suggest that lethality may not be sufficient to correctly predict the combined effects of stressors and that inclusion of endemic species is crucial to the correct risk evaluation on sensitive biomas such as Pantanal. P. varians larvae revealed to be a good model for locomotor activity evaluation and were sensitive to the Barrage® effects confirming the usefulness of behavioral endpoints in the early detection of ecological risk and suggesting that shrimps as suitable models for behavioral ecotoxicology. At histological level, results show important changes in Pantanal shrimp gills, including relevant structural lesions that may affect the physiological function of these organisms. The results of this thesis contribute to a better understanding of the Barrage® effects in the development, behavior and histology of non-target organisms, also confirming the importance of the variation of environmental components in the toxicity of this compound. Data obtained are essential to raise awareness for the need of conducting systematic studies for accurately predicting ecological risks of the use of pesticides and establishing mitigation and environmental protection measures in Pantanal.
520 $a O Pantanal (Brasil) e uma das maiores areas umidas do mundo e abriga uma consideravel diversidade de organismos aquaticos. A regiao e baseada em um ciclo hidrologico onde a cada ano os rios inundam areas extensas e periodos de seca que retiram a agua para os leitos dos rios, com importantes variacoes nas propriedades fisico-quimicas da agua de rios e lagoas. Associado a isso tem sido observado um crescimento cada vez maior de atividades agricolas e da pecuaria que dependem fortemente de produtos quimicos (pesticidas) para garantir a producao na regiao. Os efeitos desses compostos no ambiente, principalmente nos corpos d'agua nao sao muito bem conhecidos. Assim avaliar os efeitos desses compostos para a fauna aquatica tendo em consideracao variacao ambiental (a qual pode ser ainda exacerbada com as atuais mudancas do clima) torna-se pertinente. Assim, o objetivo deste trabalho foi avaliar os efeitos do Barrage®, um pesticida a base de cipermetrina amplamente utilizado na regiao, em especies de camarao (uma endemica do Pantanal) e no peixezebra. Numa primeira fase foram estudados os efeitos de variacoes de pH ou nitritos na toxicidade do Barrage® para larvas de Macrobrachium pantanalense, Macrobrachium amazonicum e Danio rerio. Numa segunda fase os efeitos histologicos do Barrage® foram avaliados em adultos de M.pantanalense. Finalmente larvas de Palemons varians foram testadas como modelo para avaliacao comportamental (locomocao) e a toxicidade comportamental do Barrage® testada nesta especie e em larvas de D. rerio. Os resultados comprovam que o pH e nitrito modificaram a toxicidade do Barrage® nas especies testadas, principalmente a nivel subletal (crescimento e desenvolvimento larval). Os resultados sugerem que a letalidade pode nao ser suficiente para prever corretamente os efeitos combinados de estressores e que a inclusao de especies endemicas e fundamental para uma correta avaliacao de risco ecologico em biomas sensiveis como o Pantanal. As larvas do camarao P. varians revelaram ser um bom modelo para avaliacao da atividade locomotora e foram sensiveis aos efeitos do Barrage® confirmando a utilidade dos parametros comportamentais na deteccao precoce de risco ecologico e indicando que o grupo dos camaroes tem potencial como modelos em ecotoxicologia comportamental. A nivel histologico, os resultados mostraram importantes alteracoes nas branquias do camarao do Pantanal, incluindo lesoes estruturais relevantes que podem afetar a funcao fisiologica destes organismos. Os resultados desta tese contribuem para uma melhor compreensao dos efeitos do Barrage® no desenvolvimento, histologia e comportamento de organismos nao alvo, confirmando ainda a importancia do estudo das variacoes ambientais na toxicidade deste composto. Estes dados sao essenciais para chamar a atencao para a necessidade de conduzir estudos sistematicos na regiao para previsao de riscos ecologicos do uso de pesticidas e estabelecimento de medidas de mitigacao e protecao ambiental no Pantanal.
590 $a School code: 5890.
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