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Ecophysical constraints on avian adaptation and diversification.

Ferran Sayol1, Bouwe R Reijenga2, Joseph A Tobias3

  • 1CREAF, Cerdanyola del Vallès 08193, Spain; Centre for Biodiversity and Environment Research, Department of Genetics, Evolution and Environment, University College London, London WC1E 6BT, UK.

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Bird beak and body shape diversity is constrained by physical and ecological factors. Evolution trends toward specialized feeding and locomotion tasks within defined morphospace boundaries.

Keywords:
Pareto optimizationbirdsecological functionecomorphologyextinctionfunctional traitsmorphospaceniche evolutionspecializationtrade-offs

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Area of Science:

  • Evolutionary Biology
  • Biomechanics
  • Animal Morphology

Background:

  • Understanding morphological diversity in animals is crucial but limited by data availability.
  • Ecophysical constraints shape form and function, particularly in producers (plants).
  • Knowledge gaps exist for consumers, especially regarding the scale of data for animals.

Purpose of the Study:

  • To investigate the constraints and evolutionary trajectories of avian morphological diversity.
  • To identify the ecophysical factors governing bird beak and body shape variation.
  • To explore the relationship between morphology, feeding tasks, and locomotion.

Main Methods:

  • Utilized morphometric measurements for a comprehensive dataset of bird species.
  • Combined morphometric data with ecological and behavioral functional information.
  • Employed phylogenetic analyses to trace evolutionary trajectories.

Main Results:

  • Avian morphospace for beak and body shape is restricted to triangular regions.
  • Morphospace extent reflects trade-offs between feeding tasks (crush, engulf, reach) and locomotion (fly, swim, walk).
  • Evolutionary trajectories show a trend from generalists toward specialists at morphospace vertices.

Conclusions:

  • Avian morphospace structure is governed by simple ecophysical rules and trade-offs.
  • These constraints shed light on the processes shaping animal diversity.
  • Further research is needed to fully understand constraints on morphospace expansion and specialist lifespans.