Os riscos de extinção de sapos, rãs e pererecas em decorrência das alterações ambientais

Verdade, Vanessa Kruth; Dixo, Marianna; Curcio, Felipe Franco

doi:10.1590/s0103-40142010000100014

Cited by 12 publications

(10 citation statements)

References 3 publications

(1 reference statement)

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“…[1,2] The most important factors contributing to this process are the loss of biodiversity with habitat destruction or alteration, the introduction of invasive and exotic species, climate change, increased UV-B radiation, chemical contamination, deformities and defects, and emerging infectious diseases such as those caused by the fungus Batrachochytrium dendrobatidis (Bd) (chytridiomycosis) and Ranavirus, which causes ranavirus infection. [3][4][5][6][7] Some frog species are also used in food, where their breeding is called "frog farming." [8] The bullfrog (Lithobates catesbeianus) is a commercially bred species that has been suggested as one of the main vectors of chytridiomycosis.…”

Section: Introductionmentioning

confidence: 99%

Median lethal concentration of formaldehyde and its genotoxic potential in bullfrog tadpoles (Lithobates catesbeianus)

Santana¹,

Reis²,

Teixeira³

et al. 2015

Journal of Environmental Science and Health, Part B

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In order to avoid that contaminated frog farms animals escaping in the environment and become potential vector of emergent diseases, studies with disinfection protocol are strictly necessary. The formaldehyde is one of the compounds tested in fungal disinfection protocols and also used in aquaculture. This study aimed to determine the median lethal concentration (LC50-96h) of formaldehyde in bullfrog tadpoles and to evaluate the possible genotoxic effects in acute exposition. Accordingly, the animals were exposed to formaldehyde in the concentrations of 6, 9, 12, 15, and 18 mg L(-1), and after 96 h blood samples were drawn for the micronucleus (MN) test. The LC50-96h was 10.53 mg L(-1), and the MN frequency increased in proportion to the formaldehyde concentrations, with an estimated frequency in the negative control being 1.35 MN/individual. We concluded that formaldehyde is genotoxic to tadpoles of bullfrogs in the tested concentrations, and the choice of this chemical should be contemplated before its use in animals in captivity.

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Section: Introductionmentioning

confidence: 99%

Median lethal concentration of formaldehyde and its genotoxic potential in bullfrog tadpoles (Lithobates catesbeianus)

Santana¹,

Reis²,

Teixeira³

et al. 2015

Journal of Environmental Science and Health, Part B

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“…More than 40% of the world's amphibian species are threatened by extinction (Pimm et al, 2014) primarily due to habitat loss and environmental degradation (Young et al, 2001;Blaustein and Kiesecker, 2002;Funk et al, 2003;Dixo et al, 2009;Verdade et al, 2010). Species responses to habitat changes vary, making it difficult to identify specific threats; this problem is magnified for species in which information on life history and ecology is lacking (Becker et al, 2007(Becker et al, , 2010.…”

Section: Introductionmentioning

confidence: 99%

Ecologia e história natural de Hypsiboas curupi (Anura, Hylidae): um anfíbio endêmico do sul da Mata Atlântica

Bastiani

Cavasotto²,

Ferreira³

et al. 2016

Neotropical Biology and Conservation

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Data on habitat use and life history are essential for evaluation of the conservation status of species, and may direct policy for preservation of natural environments. Over the course of a year, we investigated populations of Hypsiboas curupi regarding (i) nighttime activity patterns; (ii) associations with climatic variables; (iii) the spatial distribution patterns of males and females with respect to microhabitat use; and (iv) variation in body size. The study was carried out from August 2010 to July 2011 in the Parque Estadual Fritz Plaumann, a seasonal deciduous forest fragment in the western region of Santa Catarina, southern Brazil. Calling activity was highest from August to November. The number of calling males was highest at 23h, and the frequency of occurrence was influenced by the air humidity. Calling males, non-calling males, and females differed in their distance from the bank and substrate type used. Females were significantly larger and heavier than males. Our results indicate that H. curupi is highly dependent on bank vegetation, and that changes in riparian vegetation structure due to human activity can result in the loss of sites for calling and oviposition, and may reduce availability of food and shelter.Keywords: life history, riparian forest, stream-dwelling amphibians, seasonal deciduous forest, microhabitat use. ResumoInformações sobre o habitat e história de vida são essenciais para avaliar o status de conservação das espécies e definir ações para a preservação dos ambientes naturais. Ao longo de um ano, investigamos em populações de Hypsiboas curupi (i) o padrão de atividade noturna; (ii) relações com variáveis climáticas; (iii) o padrão de distribuição espacial de machos e fêmeas em termos de uso de microambientes; e (iv) variação no tamanho corporal. Conduzimos o estudo de agosto de 2010 a julho de 2011 no Parque Estadual Fritz Plaumann, um fragmento de Floresta Estacional Decidual na região oeste de Santa Catarina, sul do Brasil. O período de maior atividade foi de agosto a novembro. O maior número de machos vocalizando ocorreu às 23h e a frequência de ocorrência foi influenciada pela umidade do ar. Machos vocalizantes, não-vocalizantes e fêmeas foram discriminados pela distância da margem e tipo de substrato utilizado. Fêmeas foram significativamente maiores e mais pesadas do que machos. Os resultados indicam que H. curupi é altamente dependente da vegetação marginal. Assim, mudanças na estrutura da mata ciliar devido a ações humanas podem resultar na perda de sítios de canto e oviposição e reduzir a disponibilidade de alimento e abrigo.Palavras-chave: história de vida, mata ciliar, anfíbios de riachos, floresta estacional decidual, uso de microambiente.Ecology and natural history of Hypsiboas curupi (Anura, Hylidae): An endemic amphibian to the southern Atlantic Forest Ecologia e história natural de Hypsiboas curupi (Anura, Hylidae): um anfíbio endêmico do sul da Mata Atlântica Ecology and natural history of Hypsiboas curupi (Anura, Hylidae): An endemic amphibian to the so...

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“…They have a permeable skin, and their life cycle depends on aquatic and terrestrial habitats, so the group is especially vulnerable to minimum environmental disturbances. Currently, amphibians are globally threatened with extinction (Verdade et al 2010).…”

mentioning

confidence: 99%

Amphibians in the Brazilian Cerrado: diversity, research effort and conservation

Alves

2020

Preprint

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In order to investigate the relationship among amphibian diversity, research effort and conservation status across the Brazilian Cerrado, we carried out a scientometric analysis. Scientific publications were searched in international databases, totaling 72 studies, with 177 taxa recorded. Most studies occurred in the Southeast and Midwest regions of the country, followed by Northeast and North.The first two regions summed almost all taxa; controlling for sampling effort, however, northern regions appeared more diverse. Moreover, northern regions still preserve much of the original vegetation, while savanna in Southeast and Midwest regions has been significantly suppressed.These differences indicate particular geographical needs: immediate conservation efforts to protect diversity and restore savannas in Southeast and Midwest regions; and basic research effort (inventory) to uncover biodiversity in northern Cerrado areas.

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Os riscos de extinção de sapos, rãs e pererecas em decorrência das alterações ambientais

Cited by 12 publications

References 3 publications

Median lethal concentration of formaldehyde and its genotoxic potential in bullfrog tadpoles (Lithobates catesbeianus)

Median lethal concentration of formaldehyde and its genotoxic potential in bullfrog tadpoles (Lithobates catesbeianus)

Ecologia e história natural de Hypsiboas curupi (Anura, Hylidae): um anfíbio endêmico do sul da Mata Atlântica

Amphibians in the Brazilian Cerrado: diversity, research effort and conservation

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