Vital Limits and Rates of Desiccation in Salamanders

Ray, Carleton

doi:10.2307/1929968

Cited by 79 publications

(48 citation statements)

References 9 publications

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“…Canopy conditions in turn directly influence temperatures in associated streams, with greater canopy closure providing cooler and more stable water temperatures (Brown and Krygier, 1970;Beschta et al, 1987). Such moderated microclimatic condi-tions, especially in warmer parts of northwestern California at the southern end of the range of R. variegatus, are probably a life requisite given its physiological limitations (Ray, 1958;Brattstrom, 1963).…”

Section: Discussionmentioning

confidence: 99%

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Habitat Correlates of the Southern Torrent Salamander, Rhyacotriton variegatus (Caudata: Rhyacotritonidae), in Northwestern California

Welsh¹,

Lind²

1996

Journal of Herpetology

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. -A systematic stratified sampling design was used to quantify the habitat relationships of the southern torrent salamander, Rhyacotriton variegatus, in northwestern California. We sampled 53 first to third order streams, each surrounded by at least 5-7 ha of relatively homogeneous forest or harvested forest habitat. Measurements of 121 attributes of the forest and stream environment were recorded in conjunction with area-constrained aquatic sampling for salamanders. A subset of 68 variables, grouped into 11 ecological components including attributes at the landscape, macrohabitat, and microhabitat scales, was used in a hierarchical analysis of habitat associations. Results from discriminant and regression analyses indicated that this species occurs within a relatively narrow range of physical and microclimatic conditions and is associated with cold, clear headwater to low-order streams with loose, coarse substrates (low sedimentation), in humid forest habitats with large conifers, abundant moss, and > 80% canopy closure.

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Section: Discussionmentioning

confidence: 99%

“…Given the extreme philopatry (Nussbaum and Tait, 1977;Welsh and Lind, 1992) and the narrow physiological limits of R. uuriegutus (Ray, 1958;Brattstrom, 1963), we believe that relationships at the microhabitat-scale are more critical to an understanding of the ecology of this species.…”

Section: Discussionmentioning

confidence: 99%

Habitat Correlates of the Southern Torrent Salamander, Rhyacotriton variegatus (Caudata: Rhyacotritonidae), in Northwestern California

Welsh¹,

Lind²

1996

Journal of Herpetology

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“…Adult and juvenile red-spotted newts (Notophthalmus viridescens) avoid leaving refuge during hot and dry climatic conditions, and those individuals that left refuge traveled shorter distances after dry days [90]. These responses are species-specific, where individuals and species from drier habitats are more resistant to desiccation [91]. Small bodied amphibians are more vulnerable to desiccation in hot or dry environments [91], suggesting that newly metamorphosed individuals and adults of smaller body size may be more susceptible to mortality from changes in climate.…”

Section: Effects Of Climate Change On Behaviormentioning

confidence: 99%

“…These responses are species-specific, where individuals and species from drier habitats are more resistant to desiccation [91]. Small bodied amphibians are more vulnerable to desiccation in hot or dry environments [91], suggesting that newly metamorphosed individuals and adults of smaller body size may be more susceptible to mortality from changes in climate. A reduction in time spent foraging may in turn reduce the available resources for growth and reproduction and thus may reduce the chances of survival.…”

Section: Effects Of Climate Change On Behaviormentioning

confidence: 99%

Direct and Indirect Effects of Climate Change on Amphibian Populations

et al. 2010

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Abstract:As part of an overall decline in biodiversity, populations of many organisms are declining and species are being lost at unprecedented rates around the world. This includes many populations and species of amphibians. Although numerous factors are affecting amphibian populations, we show potential direct and indirect effects of climate change on amphibians at the individual, population and community level. Shifts in amphibian ranges are predicted. Changes in climate may affect survival, growth, reproduction and dispersal capabilities. Moreover, climate change can alter amphibian habitats including vegetation, soil, and hydrology. Climate change can influence food availability, predator-prey relationships and competitive interactions which can alter community structure. Climate change can also alter pathogen-host dynamics and greatly influence how diseases are manifested. Changes in climate can interact with other stressors such as UV-B radiation and contaminants. The interactions among all these factors are complex and are probably driving some amphibian population declines and extinctions. OPEN ACCESSDiversity 2010, 2 282

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“…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. Uma série de seis saltos como medida do desempenho foi utilizada por aparentar ser a mais representativa entre os tipos de locomoção da maioria das espécies incluídas no estudo, já que a maior parte destas são caracterizadas por uma locomoção sustentada prioritariamente por vias independentes do oxigênio (Pough et al 1992).…”

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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Vital Limits and Rates of Desiccation in Salamanders

Cited by 79 publications

References 9 publications

Habitat Correlates of the Southern Torrent Salamander, Rhyacotriton variegatus (Caudata: Rhyacotritonidae), in Northwestern California

Habitat Correlates of the Southern Torrent Salamander, Rhyacotriton variegatus (Caudata: Rhyacotritonidae), in Northwestern California

Direct and Indirect Effects of Climate Change on Amphibian Populations

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

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