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Experimental Manipulation of Body Size to Estimate Morphological Scaling Relationships in Drosophila
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Macroevolution of Steep Interspecific Metabolic Allometry in an Old Insect Order.

Daniel Schönberger1,2, Moa Metz2,3, Masahito Tsuboi2

  • 1Department of Entomology, University of Kentucky, Lexington, Kentucky, USA.

Ecology Letters
|May 17, 2026
PubMed
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Dragonflies and damselflies show metabolic isometry, challenging traditional theories of metabolic allometry. This suggests insect metabolic scaling can evolve, impacting insect size evolution.

Keywords:
allometrybayouevolvabilityinsectsmacroevolutionmetabolismnatural selectionphylogenetic comparative methodsphylogenetic path analysisphytools

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Area of Science:

  • Evolutionary Biology
  • Comparative Physiology
  • Insect Ecology

Background:

  • Metabolic allometry, typically a slope of 0.75 in endotherms, is increasingly debated as an evolutionary constraint.
  • Allometric relationships between body size and metabolism in insects remain understudied.
  • Odonata (dragonflies and damselflies) present a unique model for studying macroevolution of body size and metabolism due to their ecology.

Purpose of the Study:

  • To investigate the macroevolution of metabolic allometry in Odonata using comparative phylogenetic methods.
  • To determine the interspecific allometric slope of metabolic rate in relation to body size within Odonata.
  • To explore the evolutionary dynamics of metabolic rates, body size, and flight behavior in this insect group.

Main Methods:

  • Comparative phylogenetic analyses were employed to study metabolic allometry across Odonata species.
  • Macroevolutionary patterns of metabolic rate, body size, and flight characteristics were reconstructed.
  • Explanations for observed allometric slopes were tested, including cell size, nucleus size, and body surface area.

Main Results:

  • An interspecific allometric slope close to one (isometry) was found for metabolic rate in Odonata.
  • Metabolic rates evolved gradually with evidence of multiple shifts in optima and weak evolutionary pullback.
  • Cellular and body surface area metrics did not explain the observed metabolic isometry; high aerobic demands of flight and increased cell numbers were implicated.

Conclusions:

  • Metabolic isometry in Odonata challenges conventional allometric theories.
  • Metabolic allometries are evolvable and not strict constraints, with significant implications for insect size evolution.
  • The findings highlight the role of flight physiology and cell proliferation in shaping metabolic scaling in insects.