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Mauritsson K, Jonsson T. A new mechanistic model for individual growth applied to insects under ad libitum conditions. PLoS One 2024; 19:e0309664. [PMID: 39231173 PMCID: PMC11373858 DOI: 10.1371/journal.pone.0309664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2024] [Accepted: 08/15/2024] [Indexed: 09/06/2024] Open
Abstract
Metabolic theories in ecology interpret ecological patterns at different levels through the lens of metabolism, typically applying allometric power scaling laws to describe rates of energy use. This requires a sound theory for metabolism at the individual level. Commonly used mechanistic growth models lack some potentially important aspects and fail to accurately capture a growth pattern often observed in insects. Recently, a new model (MGM-the Maintenance-Growth Model) was developed for ontogenetic and post-mature growth, based on an energy balance that expresses growth as the net result of assimilation and metabolic costs for maintenance and feeding. The most important contributions of MGM are: 1) the division of maintenance costs into a non-negotiable and a negotiable part, potentially resulting in maintenance costs that increase faster than linearly with mass and are regulated in response to food restriction; 2) differentiated energy allocation strategies between sexes and 3) explicit description of costs for finding and processing food. MGM may also account for effects of body composition and type of growth at the cellular level. The model was here calibrated and evaluated using empirical data from an experiment on house crickets growing under ad libitum conditions. The procedure involved parameter estimations from the literature and collected data, using statistical models to account for individual variation in parameter values. It was found that ingestion rate cannot be generally described by a simple allometry, here requiring a more complex description after maturity. Neither could feeding costs be related to ingestion rate in a simplistic manner. By the unusual feature of maintenance costs increasing faster than linearly with body mass, MGM could well capture the differentiated growth patterns of male and female crickets. Some other mechanistic growth models have been able to provide good predictions of insect growth during early ontogeny, but MGM may accurately describe the trajectory until terminated growth.
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Affiliation(s)
- Karl Mauritsson
- Ecological Modelling Group, School of Bioscience, University of Skövde, Skövde, Sweden
- Ecological and Environmental Modeling, Department of Physics, Chemistry and Biology, Linköping University, Linköping, Sweden
| | - Tomas Jonsson
- Ecological Modelling Group, School of Bioscience, University of Skövde, Skövde, Sweden
- Ecological and Environmental Modeling, Department of Physics, Chemistry and Biology, Linköping University, Linköping, Sweden
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Gjoni V, Marchessaux G, Glazier DS, Wesner JS, Bosch-Belmar M, Mancuso FP, Tantillo MF, Marsiglia N, Sarà G. Metabolic scaling of an invasive mussel depends on temperature and chemical cues from an invasive predator. Biol Lett 2024; 20:20240066. [PMID: 38836647 DOI: 10.1098/rsbl.2024.0066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Accepted: 04/08/2024] [Indexed: 06/06/2024] Open
Abstract
Metabolism drives various biological processes, potentially influencing the ecological success and evolutionary fitness of species. Understanding diverse metabolic rates is fundamental in biology. Mechanisms underlying adaptation to factors like temperature and predation pressure remain unclear. Our study explored the role of temperature and predation pressure in shaping the metabolic scaling of an invasive mussel species (Brachidontes pharaonis). Specifically, we performed laboratory-based experiments to assess the effects of phenotypic plasticity on the metabolic scaling by exposing the mussels to water conditions with and without predator cues from another invasive species (the blue crab, Callinectes sapidus) across various temperature regimes. We found that temperature effects on metabolic scaling of the invasive mussels are mediated by the presence of chemical cues of an invasive predator, the blue crab. Investigating temperature-predator interactions underscores the importance of studying the ecological effects of global warming. Our research advances our understanding of how environmental factors jointly impact physiological processes.
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Affiliation(s)
- V Gjoni
- Department of Earth and Marine Science (DiSTeM), University of Palermo , Palermo, Italy
- NBFC, National Biodiversity Future Center , Palermo, Italy
| | - G Marchessaux
- Department of Earth and Marine Science (DiSTeM), University of Palermo , Palermo, Italy
- NBFC, National Biodiversity Future Center , Palermo, Italy
| | - D S Glazier
- Department of Biology, Juniata College , Huntingdon, PA, USA
| | - J S Wesner
- Department of Biology, University of South Dakota , Vermillion, SD, USA
| | - M Bosch-Belmar
- Department of Earth and Marine Science (DiSTeM), University of Palermo , Palermo, Italy
- NBFC, National Biodiversity Future Center , Palermo, Italy
| | - F P Mancuso
- Department of Earth and Marine Science (DiSTeM), University of Palermo , Palermo, Italy
- NBFC, National Biodiversity Future Center , Palermo, Italy
| | - M F Tantillo
- Department of Earth and Marine Science (DiSTeM), University of Palermo , Palermo, Italy
- NBFC, National Biodiversity Future Center , Palermo, Italy
| | - N Marsiglia
- Department of Earth and Marine Science (DiSTeM), University of Palermo , Palermo, Italy
- NBFC, National Biodiversity Future Center , Palermo, Italy
| | - G Sarà
- Department of Earth and Marine Science (DiSTeM), University of Palermo , Palermo, Italy
- NBFC, National Biodiversity Future Center , Palermo, Italy
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Pettersen AK, Metcalfe NB. Consequences of the cost of living: is variation in metabolic rate evolutionarily significant? Philos Trans R Soc Lond B Biol Sci 2024; 379:20220498. [PMID: 38186277 PMCID: PMC10772612 DOI: 10.1098/rstb.2022.0498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 11/14/2023] [Indexed: 01/09/2024] Open
Affiliation(s)
- Amanda K. Pettersen
- School of Biodiversity, One Health and Veterinary Medicine, University of Glasgow, Glasgow, G12 8QQ, UK
- School of Life and Environmental Sciences, The University of Sydney, Sydney, Australia
| | - Neil B. Metcalfe
- School of Biodiversity, One Health and Veterinary Medicine, University of Glasgow, Glasgow, G12 8QQ, UK
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