Physiological Performance Curves: When Are They Useful?

Little, Alexander G.; Seebacher, Frank

doi:10.3389/fphys.2021.805102

Cited by 11 publications

(6 citation statements)

References 30 publications

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“…Reproductive performance curve shapes should vary among taxa, populations and even individuals [77]. However, to date, performance curves have been generated for only a handful of fishes, and more studies are needed to classify how fish reproduction varies with not only temperature, but also other factors (i.e.…”

Section: Temperature Effects On Oocyte Maturation and Spawningmentioning

confidence: 99%

“…Variation in fish reproductive performance with temperature will likely reflect differences in thermal sensitivity of endocrine pathways regulating gametogenesis, noting that different hormone changes may be responsible for upper and lower limits (RT max and RT min ). Since performance reflects physiological and/or behavioural processes, reproductive performance curves might be expected to change with developmental acclimation or evolutionary adaptation to warmer temperatures [77]. For instance, the entire thermal range could shift higher to increase RT max but not thermal breadth (i.e.…”

Section: Temperature Effects On Oocyte Maturation and Spawningmentioning

confidence: 99%

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Fish reproduction in a warming world: vulnerable points in hormone regulation from sex determination to spawning

Lema,

Luckenbach,

Yamamoto

et al. 2024

Phil. Trans. R. Soc. B

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Reproduction in fishes is sensitive to temperature. Elevated temperatures and anomalous ‘heat waves’ associated with climate change have the potential to impact fish reproductive performance and, in some cases, even induce sex reversals. Here we examine how thermal sensitivity in the hormone pathways regulating reproduction provides a framework for understanding impacts of warmer conditions on fish reproduction. Such effects will differ depending on evolved variation in temperature sensitivity of endocrine pathways regulating reproductive processes of sex determination/differentiation, gametogenesis and spawning, as well as how developmental timing of those processes varies with reproductive ecology. For fish populations unable to shift geographical range, persistence under future climates may require changes in temperature responsiveness of the hormone pathways regulating reproductive processes. How thermal sensitivity in those hormone pathways varies among populations and species, how those pathways generate temperature maxima for reproduction, and how rapidly reproductive thermal tolerances can change via adaptation or transgenerational plasticity will shape which fishes are most at risk for impaired reproduction under rising temperatures. This article is part of the theme issue ‘Endocrine responses to environmental variation: conceptual approaches and recent developments’.

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Section: Temperature Effects On Oocyte Maturation and Spawningmentioning

confidence: 99%

Section: Temperature Effects On Oocyte Maturation and Spawningmentioning

confidence: 99%

Fish reproduction in a warming world: vulnerable points in hormone regulation from sex determination to spawning

Lema,

Luckenbach,

Yamamoto

et al. 2024

Phil. Trans. R. Soc. B

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show abstract

“…These performance curves can take many forms depending on the measured parameter and species. For example, common shapes of physiological performance curves include U shape, sigmoidal, logarithmic, exponential, and inverted U shape (Little and Seebacher, 2021). However, in practice the shape of these curves is often unknown and it would not be possible to derive relevant rates of change from biological observations over a relatively short period of time.…”

Section: Points To Consider When Comparing the Impacts Of Oa On Biolo...mentioning

confidence: 99%

Unifying biological field observations to detect and compare ocean acidification impacts across marine species and ecosystems: what to monitor and why

et al. 2023

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Abstract. Approximately one-quarter of the CO2 emitted to the atmosphere annually from human activities is absorbed by the ocean, resulting in a reduction of seawater pH and shifts in seawater carbonate chemistry. This multi-decadal process, termed “anthropogenic ocean acidification” (OA), has been shown to have detrimental impacts on marine ecosystems. Recent years have seen a globally coordinated effort to measure the changes in seawater chemistry caused by OA, with best practices now available for these measurements. In contrast to these substantial advances in observing physicochemical changes due to OA, quantifying their biological consequences remains challenging, especially from in situ observations under real-world conditions. Results from 2 decades of controlled laboratory experiments on OA have given insight into the likely processes and mechanisms by which elevated CO2 levels affect biological process, but the manifestation of these process across a plethora of natural situations has yet to be fully explored. This challenge requires us to identify a set of fundamental biological and ecological indicators that are (i) relevant across all marine ecosystems, (ii) have a strongly demonstrated link to OA, and (iii) have implications for ocean health and the provision of ecosystem services with impacts on local marine management strategies and economies. This paper draws on the understanding of biological impacts provided by the wealth of previous experiments, as well as the findings of recent meta-analyses, to propose five broad classes of biological indicators that, when coupled with environmental observations including carbonate chemistry, would allow the rate and severity of biological change in response to OA to be observed and compared. These broad indicators are applicable to different ecological systems, and the methods for data analysis suggested here would allow researchers to combine biological response data across regional and global scales by correlating rates of biological change with the rate of change in carbonate chemistry parameters. Moreover, a method using laboratory observation to design an optimal observing strategy (frequency and duration) and observe meaningful biological rates of change highlights the factors that need to be considered when applying our proposed observation strategy. This innovative observing methodology allows inclusion of a wide diversity of marine ecosystems in regional and global assessments and has the potential to increase the contribution of OA observations from countries with developing OA science capacity.

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“…A typical relationship between body temperature and performance in ectotherms is a skewed Gaussian distribution limited by lower and upper thermal tolerances ( Figure 1 [ 3 ]). However, the curve is not fixed and can shift in response to various variables such as environment-induced epigenetic modification and associated gene expression [ 4 ]. These shifts are remarkable, as they enable individuals and populations to overcome climatic variations.…”

Section: Introductionmentioning

confidence: 99%

Latitude-Induced and Behaviorally Thermoregulated Variations in Upper Thermal Tolerance of Two Anuran Species

Kim

Chuang

Borzée

et al. 2022

Biology

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Although thermal tolerance along geographical gradients gives an insight into species’ response to climate change, current studies on thermal tolerance are strongly skewed towards global-scale patterns. As a result, intraspecific variations are often assumed to be constant, despite a lack of evidence. To understand population-specific responses to thermal stress, we investigated the presence of intraspecific variations in the critical thermal maximum (CTmax) of tadpoles in two anuran species, Rana uenoi and Bufo sachalinensis. The study was conducted across a five-degree latitudinal gradient in the Republic of Korea. We exposed the tadpoles to increasing temperatures and recorded the CTmax for 270 R. uenoi individuals from 11 sites, collected in rice paddies, and for 240 B. sachalinensis individuals from ten sites, collected in reservoirs. We also recorded the swimming performance and behavior of the tadpoles when placed in an experimental apparatus during CTmax measurements. We then used linear regressions to determine the relationship between abiotic factors and CTmax. In R. uenoi, we found a positive relationship between latitude and CTmax, but the tadpoles did not display specific thermoregulatory behaviors. In B. sachalinensis, none of the abiotic factors such as climate and geographic coordinates were related to CTmax, but we detected a tendency to swim close to the water surface when water temperature was increasing. For R. uenoi, we tentatively relate the CTmax variability across the latitudinal gradient to a physiological adaptive response associated with habitat characteristics that are assumed to be fluctuating, as the species inhabits small water bodies prone to drying out. In the case of B. sachalinensis, the behavior observed may be linked to oxygen depletion and thermoregulation, as it may buffer temperature changes in the absence of physiological adjustment. These findings suggest that intra-specific variations in CTmax are greater than generally accounted for, and thermal conditions of natural environments are important for understanding thermal tolerance in ectothermic species. Our results highlight that species’ specific responses to climate warmings need to be studied to better protect species against climate change.

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Physiological Performance Curves: When Are They Useful?

Cited by 11 publications

References 30 publications

Fish reproduction in a warming world: vulnerable points in hormone regulation from sex determination to spawning

Fish reproduction in a warming world: vulnerable points in hormone regulation from sex determination to spawning

Unifying biological field observations to detect and compare ocean acidification impacts across marine species and ecosystems: what to monitor and why

Latitude-Induced and Behaviorally Thermoregulated Variations in Upper Thermal Tolerance of Two Anuran Species

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