Oxygen Consumption is Limited at an Ecologically Relevant Rearing Temperature in Pupfish Eggs

Jones, Alexander C.; Lim, David; Wayne-Thompson, Jacoby J.; Urbina, Natasha; Puentedura, Georgina; Hillyard, Stanley D.; Breukelen, Frank van

doi:10.1002/jez.2048

Cited by 3 publications

(1 citation statement)

References 31 publications

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“…Of course, the beneficial effects of increased variability are entwined with population size, because small populations cannot afford to lose a large fraction of their population (e.g. Devils Hole pupfish, Cyprinodon diabolis ; Jones et al, ).…”

Section: Discussionmentioning

confidence: 99%

Developmental temperature affects phenotypic means and variability: A meta‐analysis of fish data

2019

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Fishes are sensitive to their thermal environment and face an uncertain future in a warming world. Theoretically, populations in novel environments might express greater levels of phenotypic variability to increase the chance of surviving—and eventually thriving—in the new conditions. Most research on the effect of the early thermal environment in fish species focuses on average phenotypic effects rather than phenotypic variability, but to understand how fishes will respond to rising temperatures we need to consider both the average response of the population, as well as the breadth of individual responses. Here we present the first meta‐analysis on the effects of developmental temperature in fishes. Using data from 43 species and over 6,000 individual fish, we show that a change in developmental temperature induces a significant change in phenotypic means and variability, but differently depending on whether the temperature is increased or decreased. Decreases in temperature (cool environments) showed a significant decrease in phenotypic means and no change in phenotypic variability. Increases in temperature (warm environments) showed a non‐significant increase in phenotypic means and a marginally significant increase in phenotypic variability. Larger increases in temperature saw greater increases in phenotypic variability, but no increase in the mean phenotypic response. Together, our results suggest that fishes exhibit both directed and stochastic developmental plasticity in response to warming temperatures, which could facilitate or accelerate adaptation to a changing environment.

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Section: Discussionmentioning

confidence: 99%

Developmental temperature affects phenotypic means and variability: A meta‐analysis of fish data

2019

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Oxygen consumption of desert pupfish at ecologically relevant temperatures suggests a significant role for anaerobic metabolism

et al. 2018

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Oxygen consumption is oftentimes used as a proxy for metabolic rate. However, pupfish acclimated to ecologically relevant temperatures may employ extended periods of anaerobism despite the availability of oxygen-a process we called paradoxical anaerobism. In this study, we evaluated data from pupfish exhibiting stable oxygen consumption. Routine oxygen consumption ([Formula: see text]) of a refuge population derived from Cyprinodon spp. acclimated to 28 and 33 °C was evaluated at the ecologically relevant assay temperatures of between 25 and 38 °C. Different interpretations of the data are available depending on normalization. For instance, [Formula: see text] of smaller fish, measured per fish, was remarkably stable over a wide range of assay temperatures and was not different between acclimation groups. However, when measured on a mass-specific basis, [Formula: see text] in these same smaller fish increases more predictably as temperature increased. [Formula: see text] of refuge fish and the closely related pupfish, C. nevadensis mionectes, measured near their respective acclimation temperatures, were essentially identical. However, [Formula: see text] of 28 °C acclimated fish of both species, when measured at 34 °C, was greater than that of the 33 °C acclimated fish measured at 28 °C. We suggest that this observed 'efficiency' may result from significant anaerobic metabolism use. Experiments investigating factorial aerobic scope ([Formula: see text]/[Formula: see text]) yielded values less than 1 in 21-36% of the 33 °C acclimated fish. These values indicate a substantial contribution of anaerobic metabolism to energy utilization by these fish. However, muscle lactate levels are not elevated in exercising fish-a result that is consistent with paradoxical anaerobism use.

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Care and propagation of captive pupfish from the genus Cyprinodon: insight into conservation

et al. 2019

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Oxygen Consumption is Limited at an Ecologically Relevant Rearing Temperature in Pupfish Eggs

Cited by 3 publications

References 31 publications

Developmental temperature affects phenotypic means and variability: A meta‐analysis of fish data

Developmental temperature affects phenotypic means and variability: A meta‐analysis of fish data

Oxygen consumption of desert pupfish at ecologically relevant temperatures suggests a significant role for anaerobic metabolism

Care and propagation of captive pupfish from the genus Cyprinodon: insight into conservation

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