Thermal performance curves under daily thermal fluctuation: A study in helmeted water toad tadpoles

Bartheld, José Luis; Artacho, Paulina; Bacigalupe, Leonardo D.

doi:10.1016/j.jtherbio.2017.09.008

Cited by 22 publications

(18 citation statements)

References 54 publications

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“…We expected the lower thermal quality of partially exposed and potential refuges models in the cold site to be correlated with a better running performance by those individuals, to compensate for having less time available with temperatures within the TTB, as seen in many terrestrial ectotherms such as insects, amphibians and reptiles 55 . Additionally, daily temperature amplitude is more variable at high elevations and, when daily variation is situated near the most thermally sensitive areas of the TPC (such as values near T opt or near the critical thermal minima or maxima), it can reduce performance 56 , which could affect individuals from the temperate site. Nevertheless, none of these factors seems to be correlated with differences in maximal velocities between the populations.…”

Section: Estimation Of Parametric Coefficients (Se)mentioning

confidence: 99%

Running performance with emphasis on low temperatures in a Patagonian lizard, Liolaemus lineomaculatus

Cecchetto

Medina

Ibargüengoytía

2020

Sci Rep

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Lizard activity and endurance of cold climate is regulated by several factors such as evolutionary potential, acclimatization capacity, physiological tolerance, and locomotion among thermally advantageous microenvironments. Liolaemus lineomaculatus, a lizard inhabiting a wide range of cold environments in Patagonia, provides an excellent model to test interpopulation variability in thermal performance curves (TPCs) and usage of microhabitats. We obtained critical thermal minima and maxima, and performed running trials at eight temperatures using lizards from both a temperate-site (high-altitude) population at 42° S and a cold-site population at 50° S. The availability of environmental temperatures for running performance in open ground and in potential lizard refuges were recorded, and showed that lizards in the temperate site had a greater availability of thermal environments offering temperatures conducive to locomotion. Generalized additive mixed models showed that the two populations displayed TPCs of different shapes in 0.15 m runs at temperatures near their optimal temperature, indicating a difference in thermal sensitivity at high temperatures. However, the rest of the locomotor parameters remained similar between Liolaemus lineomaculatus from thermal and ecological extremes of their geographic distribution and this may partly explain their ability to endure a cold climate.

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Section: Estimation Of Parametric Coefficients (Se)mentioning

confidence: 99%

Running performance with emphasis on low temperatures in a Patagonian lizard, Liolaemus lineomaculatus

Cecchetto

Medina

Ibargüengoytía

2020

Sci Rep

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“…In such cases, the thermal sensitivity of locomotion (e.g., speed, stamina, maneuverability or other) may matter as an explanatory variable in several ecological contexts. However, for tadpoles, these variables remain practically unreported [19,72,73]. The available database carries a substantial developmental bias with far more information available for adult stages (see [21,74]).…”

Section: A Comment On Larvaementioning

confidence: 99%

Ecophysiology of Amphibians: Information for Best Mechanistic Models

et al. 2018

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Several amphibian lineages epitomize the faunal biodiversity crises, with numerous reports of population declines and extinctions worldwide. Predicting how such lineages will cope with environmental changes is an urgent challenge for biologists. A promising framework for this involves mechanistic modeling, which integrates organismal ecophysiological features and ecological models as a means to establish causal and consequential relationships of species with their physical environment. Solid frameworks built for other tetrapods (e.g., lizards) have proved successful in this context, but its extension to amphibians requires care. First, the natural history of amphibians is distinct within tetrapods, for it includes a biphasic life cycle that undergoes major habitat transitions and changes in sensitivity to environmental factors. Second, the accumulated data on amphibian ecophysiology is not nearly as expressive, is heavily biased towards adult lifeforms of few non-tropical lineages, and overlook the importance of hydrothermal relationships. Thus, we argue that critical usage and improvement in the available data is essential for enhancing the power of mechanistic modeling from the physiological ecology of amphibians. We highlight the complexity of ecophysiological variables and the need for understanding the natural history of the group under study and indicate directions deemed crucial to attaining steady progress in this field.

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“…Thermal variability may be particularly threatening to ectothermic species where body temperature is largely dictated by environmental temperature and performance is optimised within a limited range of body temperatures (Hochachka, 1967;Huey and Stevenson, 1979). Consequently, inhabiting thermally polluted waters may increase exposure to suboptimal temperatures and lead to corresponding declines in organismal performance and fitness (Bartheld et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Plastic responses to diel thermal variation in juvenile green sturgeon, Acipenser medirostris

Rodgers

Cocherell

Nguyen

et al. 2018

Journal of Thermal Biology

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Human-induced thermal variability can disrupt energy balance and performance in ectotherms; however, phenotypic plasticity may play a pivotal protective role. Ectotherm performance can be maintained in thermally heterogeneous habitats by reducing the thermal sensitivity of physiological processes and concomitant performance. We examined the capacity of juvenile green sturgeon (Acipenser medirostris) to respond to daily thermal variation. Juveniles (47 days post-hatch) were exposed to either stable (15 ± 0.5 °C) or variable (narrowly variable: 13-17 °C day or widely variable 11-21 °C day) thermoperiod treatments, with equivalent mean temperatures (15 ± 0.5 °C), for 21 days. Growth (relative growth rate, % body mass gain), upper thermal tolerance (critical thermal maxima, CTMax) and the thermal sensitivity of swimming performance (critical swimming speed, U) were assessed in fish from all treatments. Accelerated growth was observed in fish maintained under widely variable temperatures compared to narrowly variable and stable temperatures. No significant variation in CTMax was observed among thermoperiod treatments, suggesting all treatment groups acclimated to the mean temperature rather than daily maximums. The widely variable treatment induced a plastic response in swimming performance, where U was insensitive to temperature and performance was maintained across a widened thermal breadth. Maximum U attained was similar among thermoperiod treatments, but performance was maximised at different test temperatures (stable: 4.62 ± 0.44 BL s at 15 °C; narrowly variable: 4.52 ± 0.23 BL s at 21 °C; widely variable: 3.90 ± 0.24 BL s at 11 °C, mean ± s.e.m.). In combination, these findings suggest juvenile A. medirostris are resilient to daily fluctuations in temperature, within the temperature range tested here.

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Thermal performance curves under daily thermal fluctuation: A study in helmeted water toad tadpoles

Cited by 22 publications

References 54 publications

Running performance with emphasis on low temperatures in a Patagonian lizard, Liolaemus lineomaculatus

Running performance with emphasis on low temperatures in a Patagonian lizard, Liolaemus lineomaculatus

Ecophysiology of Amphibians: Information for Best Mechanistic Models

Plastic responses to diel thermal variation in juvenile green sturgeon, Acipenser medirostris

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