Activity alters how temperature influences intraspecific metabolic scaling: testing the metabolic-level boundaries hypothesis

Glazier, Douglas S.

doi:10.1007/s00360-020-01279-0

Cited by 37 publications

(64 citation statements)

References 52 publications

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“…Here, we show that the metabolic scaling of two amphipod species that inhabit markedly different aquatic ecosystems is also significantly affected by short-term acclimation to temperature and fish cues in an interactive way. Our results add to growing evidence that metabolic scaling is highly malleable, both via short-term phenotypic plasticity and long-term evolutionary adaptation (see [7,[10][11][12][13][14][15][16][17]52]). In so doing, they contradict the MTE in two important ways.…”

Section: Discussionsupporting

confidence: 78%

“…Lett. 16: 20200267 metabolically costly activity may have still occurred that changed in a size-specific way in response to temperature and predator cues (as appears to occur in many studies of resting or routine metabolism: see [14]). We suggest that the interactive effect of temperature and predatory fish cues on amphipod metabolic scaling results from coupled size-specific and temperature-dependent physiological and behavioural predatoravoidance responses.…”

Section: Discussionmentioning

confidence: 99%

“…Although temperature may have immediate phenotypic effects on the metabolic scaling of some organisms [10,12,14,16], the relative roles of genotypic adaptation and physiological acclimation involved in effects of predation risk on metabolic scaling are unknown. Predation risk is well known to influence the evolution [18] and phenotypic expression of various morphological, physiological, behavioural and life-history traits of prey organisms [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…However, the MTE has been controversial, in part because of its questionable assumption that body mass and temperature affect metabolic rate independently [4,5,7,10,11]. Numerous studies have shown interactive effects of body mass and temperature on metabolic rate [4,7,[12][13][14], which are partly explained by the metabolic-level boundaries hypothesis (MLBH) [7,[12][13][14][15], as supported by data on fishes [5,14,16] and many other organisms [12][13][14]16]. In addition, body mass and multi-generational exposure to predators can interactively affect metabolic rate in freshwater amphipods [17].…”

Section: Introductionmentioning

confidence: 99%

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Temperature and predator cues interactively affect ontogenetic metabolic scaling of aquatic amphipods

2020

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A common belief is that body mass scaling of metabolic rate results chiefly from intrinsic body-design constraints. However, several studies have shown that multiple ecological factors affect metabolic scaling. The mechanistic basis of these effects is largely unknown. Here, we explore whether abiotic and biotic environmental factors have interactive effects on metabolic scaling. To address this question, we studied the simultaneous effects of temperature and predator cues on the ontogenetic metabolic scaling of amphipod crustaceans inhabiting two different aquatic ecosystems, a freshwater spring and a saltwater lagoon. We assessed effects of phenotypic plasticity on metabolic scaling by exposing amphipods in the laboratory to water with and without fish cues at multiple temperatures. Temperature interacts significantly with predator cues to affect metabolic scaling. Our results suggest that metabolic scaling is highly malleable in response to short-term acclimation. The interactive effects of temperature and predators show the importance of studying effects of global warming in realistic ecological contexts.

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Section: Discussionsupporting

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temperature and predator cues interactively affect ontogenetic metabolic scaling of aquatic amphipods

2020

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“…It is not known how body size affects TPCs and T opt for AAS in fishes as they grow, although optimal temperature for growth declines with increasing body mass in various species ( e.g ., Björnsson & Tryggvadóttir, 1996). In terms of whether declining size is due to problems with providing oxygen for metabolism, mass‐specific MMR does in fact decline with increasing mass in many fishes due to allometric scaling phenomena whose mechanisms are still not understood (Glazier, 2020; Killen et al ., 2016b; Lefevre et al ., 2017). Nonetheless, because mass‐specific SMR also declines with mass, AAS and capacity to perform aerobic activities are maintained independent of mass (Lefevre et al ., 2017).…”

Section: Intraspecific Variation In Thermal Tolerance To Body Sizementioning

confidence: 99%

Intraspecific variation in tolerance of warming in fishes

McKenzie

Zhang

Eliason

et al. 2020

Journal of Fish Biology

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Intraspecific variation in key traits such as tolerance of warming can have profound effects on ecological and evolutionary processes, notably responses to climate change. The empirical evidence for three primary elements of intraspecific variation in tolerance of warming in fishes is reviewed. The first is purely mechanistic that tolerance varies across life stages and as fishes become mature. The limited evidence indicates strongly that this is the case, possibly because of universal physiological principles. The second is intraspecific variation that is because of phenotypic plasticity, also a mechanistic phenomenon that buffers individuals' sensitivity to negative impacts of global warming in their lifetime, or to some extent through epigenetic effects over successive generations. Although the evidence for plasticity in tolerance to warming is extensive, more work is required to understand underlying mechanisms and to reveal whether there are general patterns. The third element is intraspecific variation based on heritable genetic differences in tolerance, which underlies local adaptation and may define long-term adaptability of a species in the face of ongoing global change. There is clear evidence of local adaptation and some evidence of heritability of tolerance to warming, but the knowledge base is limited with detailed information for only a few model or emblematic species. There is also strong evidence of structured variation in tolerance of warming within species, which may have ecological and evolutionary significance irrespective of whether it reflects plasticity or adaptation. Although the overwhelming consensus is that having broader intraspecific variation in tolerance should reduce species vulnerability to impacts of global warming, there are no sufficient data on fishes to provide insights into particular mechanisms by which this may occur.

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Effects of temperature on metabolic scaling in silver carp

et al. 2021

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The association between temperature and metabolic scaling varies among species, which could be due to variation in the surface area and its scaling. This study aims to examine the effect of temperature on metabolic scaling and to verify the links between metabolic scaling and surface area scaling at both the whole body and the cell levels. The routine metabolic rate (RMR), gill surface area (GSA), ventilation frequency (VF), red blood cell surface area (SRBC), and metabolic rate (MRRBC) were determined in silver carp, and their mass‐scaling exponents were analyzed at 10 and 25°C. These results showed that body mass and temperature independently affected the RMR, GSA, and VF, suggesting constant scaling exponents of RMR (0.772), GSA (0.912), and VF (−0.282) with changing temperature. The RMR at 25°C was 2.29 times higher than that at 10°C, suggesting increased metabolic demand at a higher temperature. The results showed that the RMR increased, while the scaling exponents of RMR, GSA, and VF remained unchanged with increasing temperature. These results support the view that the scaling of oxygen supply capacity importantly affects metabolic scaling. The SRBC did not change with either temperature or body mass. However, the MRRBC increased by 5.48 times from 10 to 25°C but did not change with body mass. As the scaling exponents of RMR did not change between temperatures, the results indicate that no obvious link exists between the scaling of both the cell size and cell metabolic rate and the metabolic scaling of silver carp.

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Activity alters how temperature influences intraspecific metabolic scaling: testing the metabolic-level boundaries hypothesis

Cited by 37 publications

References 52 publications

Temperature and predator cues interactively affect ontogenetic metabolic scaling of aquatic amphipods

Temperature and predator cues interactively affect ontogenetic metabolic scaling of aquatic amphipods

Intraspecific variation in tolerance of warming in fishes

Effects of temperature on metabolic scaling in silver carp

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