Temperature Adaptations in Amphibians

Snyder, Gregory K.; Weathers, Wesley W.

doi:10.1086/282976

Cited by 107 publications

(86 citation statements)

References 12 publications

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“…Heat-tolerance limits of terrestrial ectotherms vary little with latitude whereas cold-tolerance limits decline steadily with increasing latitude (4,22,26,(28)(29)(30). Here, we show that this pattern is mirrored globally across elevational gradients (as shown regionally in ref.…”

Section: Discussionsupporting

confidence: 66%

Thermal-safety margins and the necessity of thermoregulatory behavior across latitude and elevation

Sunday

Bates

Kearney

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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Physiological thermal-tolerance limits of terrestrial ectotherms often exceed local air temperatures, implying a high degree of thermal safety (an excess of warm or cold thermal tolerance). However, air temperatures can be very different from the equilibrium body temperature of an individual ectotherm. Here, we compile thermal-tolerance limits of ectotherms across a wide range of latitudes and elevations and compare these thermal limits both to air and to operative body temperatures (theoretically equilibrated body temperatures) of small ectothermic animals during the warmest and coldest times of the year. We show that extreme operative body temperatures in exposed habitats match or exceed the physiological thermal limits of most ectotherms. Therefore, contrary to previous findings using air temperatures, most ectotherms do not have a physiological thermal-safety margin. They must therefore rely on behavior to avoid overheating during the warmest times, especially in the lowland tropics. Likewise, species living at temperate latitudes and in alpine habitats must retreat to avoid lethal cold exposure. Behavioral plasticity of habitat use and the energetic consequences of thermal retreats are therefore critical aspects of species' vulnerability to climate warming and extreme events. macrophysiology | operative temperature | climate sensitivity

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Section: Discussionsupporting

confidence: 66%

Thermal-safety margins and the necessity of thermoregulatory behavior across latitude and elevation

Sunday

Bates

Kearney

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

1,005

1,077

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“…Ambientes que sofreram alterações antrópi-cas são caracterizados por vegetação mais esparsa e estão sujeitos a maior exposição solar, menor umidade e temperaturas mais elevadas quando comparados a áreas de mata preservada, com vegetação alta, densa e dossel fechado (Sexton et al 1964, Crump 1971, Inger & Colwell 1977, Pough et al 1977. As características particulares de cada ambiente em relação a estes fatores, possivelmente determinam e limitam a distribuição das espécies presentes no PECB, uma vez que diferentes espécies de anuros respondem diferencialmente às condições ambientais, apresentando diferentes taxas de crescimento e desenvolvimento, além de exibirem graus distintos de resistência e tolerância a perda de água (e.g., Thorson & Svihla 1943, Thorson 1955, Bellis 1962, Heatwole et al 1968, Crump 1971, Snyder & Weathers 1975, Pough et al 1977, Christian et al 1988, Giaretta et al 1997, Werner & Glennemeier 1999, Halverson et al 2003, Felix et al 2004. Espécies do gênero Chaunus, por exemplo, toleram maiores níveis de perda d'água em relação a espécies de outros grupos de anuros (cf.…”

Section: Discussionunclassified

Composição e diversidade de anfíbios anuros em dois ambientes de Mata Atlântica no Parque Estadual Carlos Botelho, São Paulo, sudeste do Brasil

2007

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The Atlantic Forest is characterized by its high species richness and endemism, and is one of the 25 hotspots of biodiversity around the world. We present information on composition and diversity of anuran amphibians in two environments with different degrees of disturbance in Parque Estadual Carlos Botelho, São Paulo state, an area of Atlantic Rain Forest in southeastern Brazil. We sampled an artificial pond in a disturbed area and a pond in a preserved area by audio sampling and incidental encounters, in 36 nights in each habitat. We compared the species composition, richness, dominance, and relative abundance between the two habitats. Despite distant only ca. 400 m, we recorded only two species in common between the two habitats. We recorded in the disturbed area 10 species (N = 518) with 46.7% of dominance of Hypsiboas albopunctatus; and in the preserved habitat we recorded 11 species (N = 656) with 36.0% of dominance of Dendropsophus giesleri. Richness was not significantly different between the habitats. The estimated dominance by rarefaction in the preserved habitat was significantly lower than that in the disturbed habitat. The capability of some species populations in colonizing the disturbed habitat, the distinct physiological tolerance among species, and the dependence on specific microhabitats for reproduction are possible factors related to the observed patterns. We suggest that additional alterations of the Atlantic Forest cover inside the reserve might result in a decrease of alpha-diversity by eliminating forest dependent species, as well as a consequently increase in beta-diversity by the colonization of open area species that are ecologically more generalist. The slightly higher richness and mainly lower dominance observed in the preserved area indicate it is the habitat with higher species diversity. Thus, the presence of old-growth and/or conserved forests in the reserve is essential to maintain the local anuran diversity. A Mata Atlântica é caracterizada pela elevada riqueza e endemismo de espécies, e é um dos 25 hotspots de biodiversidade mundiais. Apresentamos informações sobre a composição e diversidade de espécies de anfíbios anuros em dois ambientes com diferentes graus de perturbação no Parque Estadual Carlos Botelho, SP, uma área de Mata Atlântica no sudeste do Brasil. Amostramos um açude em área alterada e uma lagoa em área preservada, através de procura auditiva e encontros ocasionais em 36 noites de observação em cada ambiente. As duas áreas foram comparadas em relação à composição, riqueza, dominância e abundância relativa de espécies. Apesar de próximos, cerca de 400 m, apenas duas espécies foram comuns aos dois ambientes. Na área alterada registramos 10 espécies (N = 518) e dominância de 46,7% de Hypsiboas albopunctatus, e na área preservada 11 espécies (N = 656) e dominância de 36,0% de Dendropsophus giesleri. A riqueza não foi significativamente diferente nos dois ambientes. A dominância estimada por rarefação na área preservada foi significativamente menor em

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“…In these cases, latitude becomes the unit by which thermal tolerance range is studied, rather than species (e.g. [11,12]; but see [14,16,17]), which weakens the strength of inference about species' thermal tolerance breadths. Fourth, some broad-scale studies do not account for phylogenetic or taxonomic non-independence among species [11,12,17], calling into question the degree to which the macroecological pattern may be an artefact of the taxonomically non-random species subset available for analysis at any given latitudinal band [19].…”

Section: Introductionmentioning

confidence: 99%

Global analysis of thermal tolerance and latitude in ectotherms

2010

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A tenet of macroecology is that physiological processes of organisms are linked to large-scale geographical patterns in environmental conditions. Species at higher latitudes experience greater seasonal temperature variation and are consequently predicted to withstand greater temperature extremes. We tested for relationships between breadths of thermal tolerance in ectothermic animals and the latitude of specimen location using all available data, while accounting for habitat, hemisphere, methodological differences and taxonomic affinity. We found that thermal tolerance breadths generally increase with latitude, and do so at a greater rate in the Northern Hemisphere. In terrestrial ectotherms, upper thermal limits vary little while lower thermal limits decrease with latitude. By contrast, marine species display a coherent poleward decrease in both upper and lower thermal limits. Our findings provide comprehensive global support for hypotheses generated from studies at smaller taxonomic subsets and geographical scales. Our results further indicate differences between terrestrial and marine ectotherms in how thermal physiology varies with latitude that may relate to the degree of temperature variability experienced on land and in the ocean.

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Temperature Adaptations in Amphibians

Cited by 107 publications

References 12 publications

Thermal-safety margins and the necessity of thermoregulatory behavior across latitude and elevation

Thermal-safety margins and the necessity of thermoregulatory behavior across latitude and elevation

Composição e diversidade de anfíbios anuros em dois ambientes de Mata Atlântica no Parque Estadual Carlos Botelho, São Paulo, sudeste do Brasil

Global analysis of thermal tolerance and latitude in ectotherms

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