A common temperature dependence of nutritional demands in ectotherms

Laspoumaderes, Cecilia; Meunier, Cédric L.; Magnin, Amaru; Berlinghof, Johanna; Elser, James J.; Balseiro, Esteban; Torres, Gabriela; Modenutti, Beatriz; Tremblay, Nelly; Boersma, Maarten

doi:10.1111/ele.14093

Cited by 20 publications

(11 citation statements)

References 49 publications

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“…Meta‐analyses show that litter complementarity effects are more pronounced in the earlier stage of decomposition, potentially because litter is more chemically divergent in this stage (Liu et al, 2020). An alternative explanation is that if nutrient transfer between high‐ and low‐quality litter underlies the complementarity effects in our study, then complementarity may be stronger at high elevations because decomposers face increasing nutrient limitations at the cool temperatures that typify higher elevations (Laspoumaderes et al, 2022; Woods et al, 2003).…”

Section: Discussionmentioning

confidence: 77%

Environmental heterogeneity at two spatial scales affects litter diversity–decomposition relationships

Ospina‐Bautista,

Srivastava,

Realpe

et al. 2024

Ecology

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The effects of biodiversity on ecological processes have been experimentally evaluated mainly at the local scale under homogeneous conditions. To scale up experimentally based biodiversity‐functioning relationships, there is an urgent need to understand how such relationships are affected by the environmental heterogeneity that characterizes larger spatial scales. Here, we tested the effects of an 800‐m elevation gradient (a large‐scale environmental factor) and forest habitat (a fine‐scale factor) on litter diversity–decomposition relationships. To better understand local and landscape scale mechanisms, we partitioned net biodiversity effects into complementarity, selection, and insurance effects as applicable at each scale. We assembled different litter mixtures in aquatic microcosms that simulated natural tree holes, replicating mixtures across blocks nested within forest habitats (edge, interior) and elevations (low, mid, high). We found that net biodiversity and complementarity effects increased over the elevation gradient, with their strength modified by forest habitat and the identity of litter in mixtures. Complementarity effects at local and landscape scales were greatest for combinations of nutrient‐rich and nutrient‐poor litters, consistent with nutrient transfer mechanisms. By contrast, selection effects were consistently weak and negative at both scales. Selection effects at the landscape level were due mainly to nonrandom overyielding rather than spatial insurance effects. Our findings demonstrate that the mechanisms by which litter diversity affects decomposition are sensitive to environmental heterogeneity at multiple scales. This has implications for the scaling of biodiversity–ecosystem function relationships and suggests that future shifts in environmental conditions due to climate change or land use may impact the functioning of aquatic ecosystems.

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Section: Discussionmentioning

confidence: 77%

Environmental heterogeneity at two spatial scales affects litter diversity–decomposition relationships

Ospina‐Bautista,

Srivastava,

Realpe

et al. 2024

Ecology

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“…Whereby the difference between the SMR values at the two temperatures is raised to the power of 2.5 (as

) ( Laspoumaderes et al, 2022 ).…”

Section: Methodsmentioning

confidence: 99%

Metabolic resilience of the Australasian snapper (Chrysophrys auratus) to marine heatwaves and hypoxia

Bowering,

McArley,

Devaux

et al. 2023

Front. Physiol.

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Marine organisms are under threat from a simultaneous combination of climate change stressors, including warming sea surface temperatures (SST), marine heatwave (MHW) episodes, and hypoxic events. This study sought to investigate the impacts of these stressors on the Australasian snapper (C. auratus) — a finfish species of high commercial and recreational importance, from the largest snapper fishery in Aotearoa New Zealand (SNA1). A MHW scenario was simulated from 21°C (current February SST average for north-eastern New Zealand) to a future predicted level of 25°C, with the whole-animal and mitochondrial metabolic performance of snapper in response to hypoxia and elevated temperature tested after 1-, 10-, and 30-days of thermal challenge. It was hypothesised that key indicators of snapper metabolic performance would decline after 1-day of MHW stress, but that partial recovery might arise as result of thermal plasticity after chronic (e.g., 30-day) exposures. In contrast to this hypothesis, snapper performance remained high throughout the MHW: 1) Aerobic metabolic scope increased after 1-day of 25°C exposure and remained high. 2) Hypoxia tolerance, measured as the critical O2 pressure and O2 pressure where loss of equilibrium occurred, declined after 1-day of warm-acclimation, but recovered quickly with no observable difference from the 21°C control following 30-days at 25°C. 3) The performance of snapper mitochondria was also maintained, with oxidative phosphorylation respiration and proton leak flux across the inner mitochondrial membrane of the heart remaining mostly unaffected. Collectively, the results suggest that heart mitochondria displayed resilience, or plasticity, in snapper chronically exposed to 25°C. Therefore, contrary to the notion of climate change having adverse metabolic effects, future temperatures approaching 25°C may be tolerated by C. auratus in Northern New Zealand. Even in conjunction with supplementary hypoxia, 25°C appears to represent a metabolically optimal temperature for this species.

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“…It is important to note that evolutional drivers determining the TER may be not only linked to feeding conditions, but also to metabolic demands for growth rate (in the case of P) and other traits related to fitness (such as Ca). Despite the TER being a useful tool to assess the risk for nutrient limitation and the sensitivity to nutrient excess in heterotrophs, the number of studies which evaluate the fitness response of consumers to a broad range of resource C:X ratios is still too limited to allow a robust comparative analysis (Laspoumaderes et al 2022).…”

Section: Expectation 2: Herbivores Have Higher Ter Than Carnivoresmentioning

confidence: 99%

How sharp is the knife? Herbivore and carnivore sensitivity to resource stoichiometric quality

Meunier

Boersma

Declerck

et al. 2023

Oikos

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While understanding feeding preferences of herbivores and carnivores is of major importance in ecology, we still know very little on the sensitivity of different functional groups to suboptimal stoichiometric resource quality. Here, we apply concepts of ecological stoichiometry to shed light on differences in the nutritional requirements of herbivores and carnivores, and to make predictions on the influence of suboptimal resource stoichiometric quality on the fitness of these different consumers to. Herbivores generally experience more variation in the quality of their resource than carnivores do, and these differences have likely shaped the extent to which coping mechanisms have evolved. Consequently, we expect 1) herbivores to maintain their stoichiometric homeostasis over a broader range of resource stoichiometry than carnivores, 2) the threshold elemental ratio (TER), i.e. the dietary carbon to nutrient ratio which maximizes fitness, of herbivores to be higher than that of carnivores, 3) a narrower and sharper knife‐edge response in carnivores than herbivores and 4) asymmetric knife‐edge responses indicating a higher sensitivity to the diet quality that consumers are not used to dealing with, namely nutrient limitation in carnivores and nutrient excess in herbivores. Our study poses that documenting the ranges of resource quality where consumer fitness declines in diverse organisms is a very promising avenue to increase our understanding of community composition and food web functioning.

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A common temperature dependence of nutritional demands in ectotherms

Cited by 20 publications

References 49 publications

Environmental heterogeneity at two spatial scales affects litter diversity–decomposition relationships

Environmental heterogeneity at two spatial scales affects litter diversity–decomposition relationships

Metabolic resilience of the Australasian snapper (Chrysophrys auratus) to marine heatwaves and hypoxia

How sharp is the knife? Herbivore and carnivore sensitivity to resource stoichiometric quality

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