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Environmental changes can trigger new adaptations. This study shows how feather development and carotenoid uptake coevolve, balancing robustness with evolvability through modified stress-buffering mechanisms.

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Area of Science:

  • Evolutionary biology
  • Physiological ecology
  • Developmental biology

Background:

  • Organisms must balance robustness to environmental fluctuations with the capacity for novel adaptations (evolvability).
  • Feather structure and carotenoid uptake represent a key adaptation in many bird species, influenced by environmental conditions.
  • Understanding the mechanisms underlying transitions between robustness and evolvability is crucial for predicting evolutionary trajectories.

Purpose of the Study:

  • To investigate how robustness and evolvability are reconciled during adaptive transitions.
  • To examine the coevolution of feather structure and carotenoid uptake in response to environmental change.
  • To elucidate the role of stress-buffering mechanisms in facilitating new adaptations.

Main Methods:

  • Studied transitions between adaptive associations of feather structure and carotenoid uptake.
  • Analyzed feather modifications induced by novel carotenoids during population range expansion.
  • Investigated changes in the sensitivity of feather development to local carotenoid uptake.

Main Results:

  • Feather modifications induced by new carotenoids were converted into precise coadaptations of feather development and carotenoid accommodation.
  • Populations showed a uniform and coordinated increase in the sensitivity of feather development to local carotenoid uptake.
  • This conversion suggests cooption and modification of homeostatic mechanisms buffering feather growth.

Conclusions:

  • Stress-buffering mechanisms can effectively alternate between robustness and evolvability.
  • This interplay is particularly evident in adaptations requiring integration of external inputs and internal structures.
  • The findings provide insights into the evolution of complex adaptations under fluctuating environments.