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Shokri M, Cozzoli F, Vignes F, Bertoli M, Pizzul E, Basset A. Metabolic rate and climate change across latitudes: evidence of mass-dependent responses in aquatic amphipods. J Exp Biol 2022; 225:280993. [PMID: 36337048 PMCID: PMC9720750 DOI: 10.1242/jeb.244842] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Accepted: 10/28/2022] [Indexed: 11/09/2022]
Abstract
Predictions of individual responses to climate change are often based on the assumption that temperature affects the metabolism of individuals independently of their body mass. However, empirical evidence indicates that interactive effects exist. Here, we investigated the response of individual standard metabolic rate (SMR) to annual temperature range and forecasted temperature rises of 0.6-1.2°C above the current maxima, under the conservative climate change scenario IPCC RCP2.6. As a model organism, we used the amphipod Gammarus insensibilis, collected across latitudes along the western coast of the Adriatic Sea down to the southernmost limit of the species' distributional range, with individuals varying in body mass (0.4-13.57 mg). Overall, we found that the effect of temperature on SMR is mass dependent. Within the annual temperature range, the mass-specific SMR of small/young individuals increased with temperature at a greater rate (activation energy: E=0.48 eV) than large/old individuals (E=0.29 eV), with a higher metabolic level for high-latitude than low-latitude populations. However, under the forecasted climate conditions, the mass-specific SMR of large individuals responded differently across latitudes. Unlike the higher-latitude population, whose mass-specific SMR increased in response to the forecasted climate change across all size classes, in the lower-latitude populations, this increase was not seen in large individuals. The larger/older conspecifics at lower latitudes could therefore be the first to experience the negative impacts of warming on metabolism-related processes. Although the ecological collapse of such a basic trophic level (aquatic amphipods) owing to climate change would have profound consequences for population ecology, the risk is significantly mitigated by phenotypic and genotypic adaptation.
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Affiliation(s)
- Milad Shokri
- Laboratory of Ecology, Department of Biological and Environmental Sciences and Technologies, University of Salento, S.P. Lecce-Monteroni, 73100 Lecce, Italy,Authors for correspondence (; )
| | - Francesco Cozzoli
- Laboratory of Ecology, Department of Biological and Environmental Sciences and Technologies, University of Salento, S.P. Lecce-Monteroni, 73100 Lecce, Italy,Research Institute on Terrestrial Ecosystems (IRET–URT Lecce), National Research Council of Italy (CNR), Campus Ecotekne, S.P. Lecce-Monteroni, 73100 Lecce, Italy,Authors for correspondence (; )
| | - Fabio Vignes
- Laboratory of Ecology, Department of Biological and Environmental Sciences and Technologies, University of Salento, S.P. Lecce-Monteroni, 73100 Lecce, Italy
| | - Marco Bertoli
- Department of Life Science, University of Trieste, Via Giorgieri 10, 34127 Trieste, Italy
| | - Elisabetta Pizzul
- Department of Life Science, University of Trieste, Via Giorgieri 10, 34127 Trieste, Italy
| | - Alberto Basset
- Laboratory of Ecology, Department of Biological and Environmental Sciences and Technologies, University of Salento, S.P. Lecce-Monteroni, 73100 Lecce, Italy,National Biodiversity Future Center, Palermo 90133, Italy
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Liu W, Liu P, Cui L, Meng Y, Tao S, Han X, Sun B. Moderate climate warming scenarios during embryonic and post‐embryonic stages benefit a cold‐climate lizard. Funct Ecol 2022. [DOI: 10.1111/1365-2435.14032] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wan‐li Liu
- Key Laboratory of Animal Ecology and Conservation Biology Institute of Zoology Chinese Academy of Sciences Beijing 100101 P. R. China
- College of Life Science and Technology Harbin Normal University Harbin 150025 P. R. China
| | - Peng Liu
- College of Life Science and Technology Harbin Normal University Harbin 150025 P. R. China
| | - Luo‐xin Cui
- College of Life Science and Technology Harbin Normal University Harbin 150025 P. R. China
| | - Yu Meng
- College of Life Science and Technology Harbin Normal University Harbin 150025 P. R. China
| | - Shi‐ang Tao
- Key Laboratory of Animal Ecology and Conservation Biology Institute of Zoology Chinese Academy of Sciences Beijing 100101 P. R. China
| | - Xing‐zhi Han
- College of Wildlife Resources Northeast Forestry University Harbin 150040 P. R. China
| | - Bao‐jun Sun
- Key Laboratory of Animal Ecology and Conservation Biology Institute of Zoology Chinese Academy of Sciences Beijing 100101 P. R. China
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Lack of age-related respiratory changes in Daphnia. Biogerontology 2022; 23:85-97. [PMID: 34989913 DOI: 10.1007/s10522-021-09947-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 12/23/2021] [Indexed: 12/29/2022]
Abstract
Aging is a multifaceted process of accumulation of damage and waste in cells and tissues; age-related changes in mitochondria and in respiratory metabolism have the focus of aging research for decades. Studies of aging in nematodes, flies and mammals all revealed age-related decline in respiratory functions, with somewhat controversial causative role. Here we investigated age-related changes in respiration rates, lactate/pyruvate ratio, a commonly used proxy for NADH/NAD+ balance, and mitochondrial membrane potential in 4 genotypes of an emerging model organism for aging research, a cyclic parthenogen Daphnia magna. We show that total body weight-adjusted respiration rate decreased with age, although this decrease was small in magnitude and could be fully accounted for by the decrease in locomotion and feeding activity. Neither total respiration normalized by protein content, nor basal respiration rate measured in anaesthetized animals decreased with age. Lactate/pyruvate ratio and mitochondrial membrane potential (∆Ψmt) showed no age-related changes, with possible exceptions of ∆Ψmt in epipodites (excretory and gas exchange organs) in which ∆Ψmt decreased with age and in the optical lobe of the brain, in which ∆Ψmt showed a maximum at middle age. We conclude that actuarial senescence in Daphnia is not caused by a decline in respiratory metabolism and discuss possible mechanisms of maintaining mitochondrial healthspan throughout the lifespan.
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