Intraspecific geographic variation in thermal limits and acclimatory capacity in a wide distributed endemic frog

Barria, Aura M.; Bacigalupe, Leonardo D.

doi:10.1016/j.jtherbio.2017.08.010

Cited by 34 publications

(15 citation statements)

References 85 publications

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“…Though studies suggest that some aspects of thermal physiology exhibit broad‐sense heritability (Arnold et al, 1995; Sinervo, 1990), the few studies quantifying additive genetic variance in reptiles found little evidence of narrow‐sense heritability (Logan et al, 2018; Martins et al, 2019). Further, divergence in warm‐temperature physiological traits are sometimes observed at intra‐ and interspecific scales (Barria & Bacigalupe, 2017; Gunderson et al, 2018; Herrando‐Pérez et al, 2019, 2020; Pontes‐da‐Silva et al, 2018; Salazar et al, 2019; Skelly & Friedenberg, 2000; van Berkum, 1986). The extent to which these findings can be generalized across taxa and contexts remains to be determined, toward the goal of building a synthetic understanding of how reptiles and amphibians might evolve in response to ongoing climate change.…”

Section: Evolution and Climate Changementioning

confidence: 99%

Thermal adaptation revisited: How conserved are thermal traits of reptiles and amphibians?

et al. 2020

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Ectothermic animals, such as amphibians and reptiles, are particularly sensitive to rapidly warming global temperatures. One response in these organisms may be to evolve aspects of their thermal physiology. If this response is adaptive and can occur on the appropriate time scale, it may facilitate population or species persistence in the changed environments. However, thermal physiological traits have classically been thought to evolve too slowly to keep pace with environmental change in longer‐lived vertebrates. Even as empirical work of the mid‐20th century offers mixed support for conservatism in thermal physiological traits, the generalization of low evolutionary potential in thermal traits is commonly invoked. Here, we revisit this hypothesis to better understand the mechanisms guiding the timing and patterns of physiological evolution. Characterizing the potential interactions among evolution, plasticity, behavior, and ontogenetic shifts in thermal physiology is critical for accurate prediction of how organisms will respond to our rapidly warming world. Recent work provides evidence that thermal physiological traits are not as evolutionarily rigid as once believed, with many examples of divergence in several aspects of thermal physiology at multiple phylogenetic scales. However, slow rates of evolution are often still observed, particularly at the warm end of the thermal performance curve. Furthermore, the context‐specificity of many responses makes broad generalizations about the potential evolvability of traits tenuous. We outline potential factors and considerations that require closer scrutiny to understand and predict reptile and amphibian evolutionary responses to climate change, particularly regarding the underlying genetic architecture facilitating or limiting thermal evolution.

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Section: Evolution and Climate Changementioning

confidence: 99%

Thermal adaptation revisited: How conserved are thermal traits of reptiles and amphibians?

et al. 2020

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“…This difference in behavior may result from acclimation or adaptation of T pref to the elevated temperatures individuals are exposed to in converted habitats. A previous study reported intraspecific variation in preferred temperatures of wood frog tadpoles from thermally contrasting ponds (Freidenburg & Skelly, ), and studies measuring preferred temperatures of individuals along an elevational gradient have shown selection of higher temperatures by individuals from warmer habitats at lower elevations (Barria & Bacigalupe, ). If T pref is often labile, then individuals may be able to behaviorally adapt to novel temperature regimes in converted habitats.…”

Section: Discussionmentioning

confidence: 98%

“…The potential for species to shift their thermal niches has consequences for predicting their responses to both the rapid temperature changes that result from habitat conversion and the more gradual changes resulting from climate warming (Sinclair et al., ). Critical thermal tolerances and preferred body temperatures have been found to vary among populations living in regions with different climate conditions (Barria & Bacigalupe, ; Riquelme, Díaz‐Páez & Ortiz, ; Simon, Ribeiro & Navas, ). Furthermore, acclimation experiments have shown capacity for modest changes in individuals’ thermal tolerances as a response to exposure to different experimental temperatures.…”

Section: Introductionmentioning

confidence: 99%

Thermal niche variation among individuals of the poison frog, Oophaga pumilio, in forest and converted habitats

et al. 2019

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The conversion of natural habitats to human land uses often increases local temperatures, creating novel thermal environments for species. The variable responses of ectotherms to habitat conversion, where some species decline while others persist, can partly be explained by variation among species in their thermal niches. However, few studies have examined thermal niche variation within species and across forest-land use ecotones, information that could provide clues about the capacity of species to adapt to changing temperatures. Here, we quantify individual-level variation in thermal traits of the tropical poison frog, Oophaga pumilio, in thermally contrasting habitats. Specifically, we examined local environmental temperatures, field body temperatures (T b ), preferred body temperatures (T pref ), critical thermal maxima (CT max ), and thermal safety margins (TSM) of individuals from warm, converted habitats and cool forests. We found that frogs from converted habitats exhibited greater mean T b and T pref than those from forests. In contrast, CT max and TSM did not differ significantly between habitats. However, CT max did increase moderately with increasing T b , suggesting that changes in CT max may be driven by microscale temperature exposure within habitats rather than by mean habitat conditions. Although O. pumilio exhibited moderate divergence in T pref , CT max appears to be less labile between habitats, possibly due to the ability of frogs in converted habitats to maintain their T b below air temperatures that reach or exceed CT max . Selective pressures on thermal tolerances may increase, however, with the loss of buffering microhabitats and increased frequency of extreme temperatures expected under future habitat degradation and climate warming.Abstract in Spanish is available with online material. K E Y W O R D Samphibians, body temperature, Costa Rica, CT max , ectotherm, habitat loss, land use, tropical wet forest S U PP O RTI N G I N FO R M ATI O NAdditional supporting information may be found online in the Supporting Information section at the end of the article.

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“…The ratio between daily and annual thermal ranges (O'Donnell & Ignizio, ) experienced by this extreme population (0.65) is ca. 15% higher than that of a population 2,000 km south (0.52), which experiences narrower daily environmental temperatures at the center of the species’ distribution (Barria & Bacigalupe, ). This means that the studied population experiences a daily variation that is almost 65% of its seasonal variation.…”

Section: Discussionmentioning

confidence: 99%

Natural selection on plasticity of thermal traits in a highly seasonal environment

Bacigalupe

Gaitán‐Espitía

Barria

et al. 2018

Evolutionary Applications

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For ectothermic species with broad geographical distributions, latitudinal/altitudinal variation in environmental temperatures (averages and extremes) is expected to shape the evolution of physiological tolerances and the acclimation capacity (i.e., degree of phenotypic plasticity) of natural populations. This can create geographical gradients of selection in which environments with greater thermal variability (e.g., seasonality) tend to favor individuals that maximize performance across a broader range of temperatures compared to more stable environments. Although thermal acclimation capacity plays a fundamental role in this context, it is unknown whether natural selection targets this trait in natural populations. Additionally, understanding whether and how selection acts on thermal physiological plasticity is also highly relevant to climate change and biological conservation. Here, we addressed such an important gap in our knowledge in the northernmost population of the four‐eyed frog, Pleurodema thaul. We measured plastic responses of critical thermal limits for activity, behavioral thermal preference, and thermal sensitivity of metabolism to acclimation at 10 and 20°C. We monitored survival during three separate recapture efforts and used mark‐recapture integrated into an information‐theoretic approach to evaluate the relationship between survivals as a function of the plasticity of thermal traits. Overall, we found no evidence that thermal acclimation in this population is being targeted by directional selection, although there might be signals of selection on individual traits. According to the most supported models, survival increased in individuals with higher tolerance to cold when cold‐acclimated, probably because daily low extremes are frequent during the cooler periods of the year. Furthermore, survival increased with body size. However, in both cases, the directional selection estimates were nonsignificant, and the constraints of our experimental design prevented us from evaluating more complex models (i.e., nonlinear selection).

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Intraspecific geographic variation in thermal limits and acclimatory capacity in a wide distributed endemic frog

Cited by 34 publications

References 85 publications

Thermal adaptation revisited: How conserved are thermal traits of reptiles and amphibians?

Thermal adaptation revisited: How conserved are thermal traits of reptiles and amphibians?

Thermal niche variation among individuals of the poison frog, Oophaga pumilio, in forest and converted habitats

Natural selection on plasticity of thermal traits in a highly seasonal environment

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