Testing the heat-invariant and cold-variability tolerance hypotheses across geographic gradients

Bozinovic, Francisco; Orellana, María José; Martel, Sebastián I.; Bogdanovich, José M.

doi:10.1016/j.cbpa.2014.08.009

Cited by 25 publications

(25 citation statements)

References 32 publications

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“…In addition, UTL was plastic only in flies acclimated to variable thermal conditions. As a consequence, a right shift of the performance curve was detected; thus, ontogenetic thermal tolerance of ectotherms in response to increased performance at variable temperatures rejects the heat‐invariant hypotheses in ectotherms (Bozinovic et al ., ).…”

Section: Discussionmentioning

confidence: 97%

Ontogenetic thermal tolerance and performance of ectotherms at variable temperatures

Cavieres

Bogdanovich

Bozinovic

2016

J of Evolutionary Biology

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Early experience and environmental conditions during ontogeny may affect organismal structure, physiology and fitness. Here, we assessed the effect of developmental acclimation to environmental thermal variability on walking speed in Drosophila melanogaster adults. Our results showed a shift in the performance curve to the right. Thus, upper and lower thermal limits exhibited developmental plasticity. Additionally, in constant and variable climatic scenarios, flies shifted to the right the optimum temperature but the maximum performance decreased only in flies reared on high temperatures and high thermal variability. Overall, we showed that environmental cues during ontogeny might help to construct phenotypic variation, which supports the hypothesis of ontogenetic dependence of thermal tolerances.

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Section: Discussionmentioning

confidence: 97%

Ontogenetic thermal tolerance and performance of ectotherms at variable temperatures

Cavieres

Bogdanovich

Bozinovic

2016

J of Evolutionary Biology

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“…The latter is the case particularly in northern latitudes, where differences between absolute maximum and absolute minimum temperatures are greatest (Addo‐Bediako, Chown & Gaston, ; Chown et al, ). Supporting evidence of a hemispheric asymmetry in physiological tolerance (with assumed underlying plasticity) has been reported for insects (Addo‐Bediako, Chown & Gaston, ; Sinclair, Addo‐Bediako & Chown, ) and terrestrial isopods (Bozinovic et al, ), but evidence for other taxa is lacking.…”

Section: Physiology Individual Performance and Fitnessmentioning

confidence: 99%

Ecological and evolutionary impacts of changing climatic variability

et al. 2015

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While average temperature is likely to increase in most locations on Earth, many places will simultaneously experience higher variability in temperature, precipitation, and other climate variables. Although ecologists and evolutionary biologists widely recognize the potential impacts of changes in average climatic conditions, relatively little attention has been paid to the potential impacts of changes in climatic variability and extremes. We review the evidence on the impacts of increased climatic variability and extremes on physiological, ecological and evolutionary processes at multiple levels of biological organization, from individuals to populations and communities. Our review indicates that climatic variability can have profound influences on biological processes at multiple scales of organization. Responses to increased climatic variability and extremes are likely to be complex and cannot always be generalized, although our conceptual and methodological toolboxes allow us to make informed predictions about the likely consequences of such climatic changes. We conclude that climatic variability represents an important component of climate that deserves further attention.

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“…The main aim of this research is to examine three hypotheses of variation in thermal limits at large geographical scales (Chown & Gaston, ; Sheldon et al., ). First, that upper thermal limits are less spatially variable than lower thermal limits at a range of scales: Brett's heat‐invariant hypothesis (Bozinovic, Orellana, Martel, & Bogdanovich, ; Brett, ). This hypothesis predicts a stronger response of cold tolerance limits than heat tolerance limits with increasing elevation and latitude (Bishop, Robertson, Van Rensburg, & Parr, ; Gaston & Chown, ; von May et al., ; Muñoz et al., ; Sunday et al., ).…”

Section: Introductionmentioning

confidence: 99%

Elevational and microclimatic drivers of thermal tolerance in Andean Pristimantis frogs

Pintanel

Tejedo

Ron

et al. 2019

Journal of Biogeography

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Aim We analysed elevational and microclimatic drivers of thermal tolerance diversity in a tropical mountain frog clade to test three macrophysiological predictions: less spatial variation in upper than lower thermal limits (Bretts’ heat‐invariant hypothesis); narrower thermal tolerance ranges in habitats with less variation in temperature (Janzen's climatic variability hypothesis); and higher level of heat impacts at lower elevations. Location Forest and open habitats through a 4,230‐m elevational gradient across the tropical Andes of Ecuador. Method We examined variability in critical thermal limits (CTmax and CTmin) and thermal breadth (TB; CTmax–CTmin) in 21 species of Pristimantis frogs. Additionally, we monitored maximum and minimum temperatures at the local scale (tmax, tmin) and estimated vulnerability to acute thermal stress from heat (CTmax–tmax) and cold (tmin–CTmin), by partitioning thermal diversity into elevational and microclimatic variation. Results Our results were consistent with Brett's hypothesis: elevation promotes more variation in CTmin and tmin than in CTmax and tmax. Frogs inhabiting thermally variable open habitats have higher CTmax and tmax and greater TBs than species restricted to forest habitats, which show less climatic overlap across the elevational gradient (Janzen's hypothesis). Vulnerability to heat stress was higher in open than forest habitats and did not vary with elevation. Main conclusions We suggest a mechanistic explanation of thermal tolerance diversity in elevational gradients by including microclimatic thermal variation. We propose that the unfeasibility to buffer minimum temperatures locally may explain the rapid increase in cold tolerance (lower CTmin) with elevation. In contrast, the relative invariability in heat tolerance (CTmax) with elevation may revolve around the organisms’ habitat selection of open‐ and canopy‐buffered habitats. Secondly, on the basis of microclimatic estimates, lowland and upland species may be equally vulnerable to temperature increase, which is contrary to the pattern inferred from regional interpolated climate estimators.

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Testing the heat-invariant and cold-variability tolerance hypotheses across geographic gradients

Cited by 25 publications

References 32 publications

Ontogenetic thermal tolerance and performance of ectotherms at variable temperatures

Ontogenetic thermal tolerance and performance of ectotherms at variable temperatures

Ecological and evolutionary impacts of changing climatic variability

Elevational and microclimatic drivers of thermal tolerance in Andean Pristimantis frogs

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