Water balance and locomotor performance in three species of neotropical toads that differ in geographical distribution

Titon, Braz; Navas, Carlos A.; Jim, Jorge; Gomes, Fernando Ribeiro

doi:10.1016/j.cbpa.2010.01.009

Cited by 62 publications

(86 citation statements)

References 52 publications

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“…Both cooling and dehydration impaired the hopping performance of Rhinella granulosa, as has been observed for other anurans (John-Alder et al 1989;Moore and Gatten 1989;Navas 1996;Wilson 2001;Titon et al 2010;Tingley et al 2012). However, we found no evidence that temperature and hydration interact to determine hopping speed in this species.…”

Section: Discussioncontrasting

confidence: 54%

“…Although methodological differences among studies are a possible source of disparity (Preest and Pough 2003), interactions between environmental factors seem to be species specific, possibly due to habitat, behavior, or life history. For instance, the sensitivity of locomotion to dehydration is lower at 15Њ than at 25Њ or 35ЊC for the winter breeder Rhinella icterica, while the locomotion of Rhinella ornata, a species with broader reproductive season, shows high sensitivity to dehydration throughout this same range of temperatures (Titon et al 2010). …”

Section: Discussionmentioning

confidence: 99%

“…Low temperatures and poor hydration reduce exercise capacity by slowing heart rate, cellular metabolism (Whitford 1973;Carey 1979;Hillman 1984;Gatten 1987), and muscular activity (Renaud and Stevens 1981;Hillman 1982;Navas et al 1999). Consequently, cool or dehydrated individuals move more slowly (Preest andPough 1989, 2003;Titon et al 2010) and fatigue more rapidly (Moore and Gatten 1989) when exercising. Thermal and hydric constraints have broad effects on the ecology of terrestrial amphibians, whose body temperatures change with environmental conditions (Navas 1996;Seebacher and Alford 2002) and whose skin has evolved to be permeable (Lillywhite 2006).…”

Section: Dehydration Hardly Slows Hopping Toads (Rhinella Granulosa) mentioning

confidence: 99%

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Dehydration Hardly Slows Hopping Toads (Rhinella granulosa) from Xeric and Mesic Environments

Prates¹,

Angilleta²,

Wilson³

et al. 2013

Physiological and Biochemical Zoology

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The locomotor capacity of amphibians depends strongly on temperature and hydration. Understanding the potential interactions between these variables remains an important challenge because temperature and water availability covary strongly in natural environments. We explored the effects of temperature and hydration on the hopping speeds of Rhinella granulosa, a small toad from the semiarid Caatinga and the Atlantic Rain Forest in Brazil. We asked whether thermal and hydric states interact to determine performance and whether toads from the Caatinga differ from their conspecifics from the Atlantic Forest. Both dehydration and cooling impaired hopping speed, but effects were independent of one another. In comparison to performances of other anurans, the performance of R. granulosa was far less sensitive to dehydration. Consequently, dehydrated members of this species may be able to sustain performance through high body temperatures, which agrees with the exceptional heat tolerance of this species. Surprisingly, toads from both the Caatinga and the Atlantic Forest were relatively insensitive to dehydration. This observation suggests that migration or gene flow between toads from the forest and those from a drier region occurred or that toads from a dry region colonized the forest secondarily.

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Section: Discussioncontrasting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Section: Dehydration Hardly Slows Hopping Toads (Rhinella Granulosa) mentioning

confidence: 99%

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Dehydration Hardly Slows Hopping Toads (Rhinella granulosa) from Xeric and Mesic Environments

Prates¹,

Angilleta²,

Wilson³

et al. 2013

Physiological and Biochemical Zoology

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“…Ao longo das últimas três décadas, vários estudos foram realizados na região (e.g., Caramaschi & Jim 1980, Rossa-Feres & Jim 1994, 1996a, b, Martins & Jim 2003, 2004, Martins et al 2006, Melo et al 2007, Titon Junior et al 2010) e até o momento, 52 espécies de anuros foram registradas , Almeida et al 2008, Maffei et al 2009, Almeida 2010. Entre essas espécies, Proceratophrys moratoi (Jim & Caramaschi 1980) e Bokermannohyla izecksohni (Jim & Caramaschi 1979) são as únicas a constar como ameaçadas na lista de espécies brasileiras (Jim & Martins 2008, Spirandeli-Cruz & Jim 2008, e apenas P. moratoi figura na categoria vulnerável na lista do estado de São Paulo ).…”

Section: Introductionunclassified

Anurofauna em uma área na Depressão Periférica, no centro-oeste do estado de São Paulo, Brasil

2013

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fauna in a Peripheral Depression area in the middle-west of São Paulo State, Brazil. Biota Neotrop. 13(2): http://www.biotaneotropica.org.br/v13n2/en/abstract?invent ory+bn01313022013Abstract: In the last eight decades, São Paulo state has been a center of anurans research. However, at centralwest of São Paulo state, studies in Peripheral Depression (PD) communities are scarce. In order to bring new information, our objectives were surveying frogs in PD area, linking our results with other data and comparing with known results from crest of the Botucatu cuesta. The inventory was conducted during 13 months (December 2008 to December 2009, and data has obtained in 24 days sampling. The frogs were investigated in sites that anurans currently using for reproduction, by traditional field methods, based on visual-encounter survey and auditory. We recorded 29 species into 12 genera and six families. The high frog diversity was considered because this area has suffered human action. Although the most of the species has been identified in open areas, we associated this high number due to forest remnants in interfluves. Therefore, the differences between our study and others at the same region were due low number of related species on the forest environment. The absence of similar topography at PD probably was a determinant factor for the low number of species in forest habitat. The amphibian activity was higher during hot and humid period and a decrease in the cold and dry period. The most part of anurans had a restricted activity during rainy season; however, each species has its own period and peak of calling activity. The similarity results indicate the most part of higher clusters was observed between species that different requirements for habitat and microhabitat. We believe that, differences in temporal pattern distribution of organisms in the community are of great importance in sharing resources and adjusting the species in the community, which contributed to the high number of amphibians and observed the coexistence of taxa in the study area. Resumo: A anurofauna do estado de São Paulo, nas últimas oito décadas, tem sido foco do estudo de importantes grupos de pesquisa em anfíbios anuros. Porém, pesquisas realizadas com comunidades na área da Depressão Periférica do centro-oeste paulista ainda são escassas. A fim de trazer novas informações sobre essa região, nosso objetivo foi inventariar a anurofauna de uma área na Depressão Periférica, associando os resultados com dados da literatura e confrontando os mesmos com aqueles conhecidos para a anurofauna no altiplano da Cuesta de Botucatu. O inventário foi realizado a partir dos dados obtidos em 24 dias de amostragem, decorridos 13 meses de coleta (dezembro de 2008 a dezembro de 2009). Os anuros foram amostrados em potenciais sítios reprodutivos, pelos métodos de encontro visual e busca auditiva. Foram registradas 29 espécies distribuídas em 12 gêneros e seis famílias. Apesar da maioria das espécies serem predominantemente de áreas abertas, consideramos a riqueza...

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“…Podem ser encontrados na literatura diversos estudos comparativos que trazem evidências da relação entre ocupação de ambientes que diferem em disponibilidade hídrica e variáveis associadas ao balanço hídrico em anuros, tais como taxas de perda de água por evaporação, que mostra que espécies de ambientes úmidos apresentam maiores valores (Warburg 1965;Gehlbach et al 1969); taxas de reidratação, mostrando que espécies de ambientes áridos apresentam as maiores taxas (Main & Bentley 1964;Christensen 1974 Viborg e Hillyard 2005; Viborg et al 2006); e sensibilidade do desempenho locomotor à desidratação, mostrando que essa sensibilidade pode significar uma restrição à ocupação de ambientes mais abertos (Beuchat et al 1984;Titon et al 2010). Porém, é importante lembrar também que outros estudos não encontram tais relações (Littleford et al 1947;Thorson 1955;Ray 1958;Claussen 1969;Fair 1970 Uma observação também deve ser feita quanto à escolha da forma com que a sensibilidade do desempenho locomotor à desidratação foi avaliada.…”

Section: Balanço Hídrico E As Relações Com Hábito E Hábitatunclassified

Balanço híbrido e desempenho locomotor em esécies de anuros de mata atlântica e cerrado

Titon¹

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Projeto Jovem Pesquisador (06/54699-1) Programa de Pós-graduação em Ciências Biológicas (Zoologia) -Instituto deBiociências -UNESP -Botucatu. Departamento de Fisiologia -Instituto de Biociências -UNESP -Botucatu.Sumário -H - Lista de tabelas:Tabela 1: Estatística descritiva trazendo média ± desvio padrão da massa corpórea, resistência à perda de água por evaporação, taxa de perda de água por evaporação, taxa de reidratação a partir de água livre e sensibilidade do desempenho locomotor à desidratação para cada espécie, bem como as famílias às quais pertencem.Tabela 2: Probabilidade de presença de sinal filogenético e resultado da estatística K para as variáveis estudadas.Tabela 3: Fatores retidos na análise de componentes principais das características associadas ao balanço hídrico de espécies de anuros do Estado de São Paulo.Tabela 4: Valores de F obtidos da ANOVA e percentil 95.º dos valores de F de mil simulações de evolução Browniana ao longo da filogenia das variáveis: massa corpórea, resistência à perda de água por evaporação e taxa de perda de água por evaporação para três categorias de hábito (arborícola, terrícola e criptozóico) e duas categorias de habitat (Mata Atlântica e Cerrado). Tabela 5:Resultados da ANOVA das variáveis: taxa de reidratação a partir de água livre e sensibilidade do desempenho locomotor à desidratação para três categorias de hábito (arborícola, terrícola e criptozóico) e duas categorias de habitat (Mata Atlântica e Cerrado).Tabela 6: Hábitat, hábito e resistência à perda de água por evaporação de espécies consideradas à prova de água e espécies com resistência moderada.Resumo -L - Paulo consists an interesting system to study the relationship between water balance and geographic distribution, since these two biomes differ in fundamental aspects for amphibian life history, such as rainfall and vegetation cover. The objective of this project was to investigate (1) the evolution of the sensitivity of locomotor performance to dehydration (SDLD), rates of evaporative water loss (TPAE), resistance to evaporative water loss (RPAE) and rates of rehydration from free water (TRAL) along the phylogeny of anurans from the State of São Paulo, (2) the evolutionary relationships between these variables, and (3) their possible associations with the geographic distribution of the species, through a comparative approach of species found in the Atlantic Forest and the Cerrado. We found significant phylogenetic signal for RPAE, TPAE, and body mass, probably with a large influence of genetic drift along the phylogeny in the evolution of these characters. The relationships between all variables corrected for phylogeny can be summarized by two main components.The first component explained 49.77% of the variance, and showed a positive relationship between TPAE and SDLD, and both were negatively related to RPAE. Since the variation in the rate of evaporative water loss is determined by skin resistance to evaporative water loss, TPAE and RPAE should comprise an evolutionary unit. A plausible hypothesis ...

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Water balance and locomotor performance in three species of neotropical toads that differ in geographical distribution

Cited by 62 publications

References 52 publications

Dehydration Hardly Slows Hopping Toads (Rhinella granulosa) from Xeric and Mesic Environments

Dehydration Hardly Slows Hopping Toads (Rhinella granulosa) from Xeric and Mesic Environments

Anurofauna em uma área na Depressão Periférica, no centro-oeste do estado de São Paulo, Brasil

Balanço híbrido e desempenho locomotor em esécies de anuros de mata atlântica e cerrado

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