The physiology of movement.

Area of Science:

• Animal movement ecology
• Physiological mechanisms of behavior
• Integrative biology

Background:

• Environmental cues translate to movement decisions based on an individual's internal state, balancing costs and benefits.
• Internal state is mechanistically underpinned by general body condition, metabolic, and hormonal physiology.
• These physiological determinants are tightly linked, crucial for a mechanistic understanding of movement.

Purpose of the Study:

• Synthesize evidence on physiological drivers and signatures of animal movement.
• Review how physiological state (body condition, hormones) correlates with movement decisions (foraging, migration, dispersal).
• Explore links between physiological changes and molecular pathways influencing movement.

Main Methods:

• Literature synthesis and review of existing evidence.
• Analysis of correlations between physiological measures (body condition, hormones) and movement behaviors.
• Examination of molecular pathways and metabolic processes (e.g., glycolysis) related to movement.

Main Results:

• High body condition generally facilitates efficient foraging, dispersal, and migration.
• Decreased individual condition can stimulate dispersal decisions in some cases.
• Stressors induce physiological cascades via stress hormones, linking movement to hormone levels across taxa.
• Energy metabolism and timing processes are central to movement physiology, particularly in migration.

Conclusions:

• Physiological feedbacks are critical for a mechanistic understanding of movement.
• Movement ecology is influenced by body condition, hormonal regulation, and metabolic pathways.
• Further research into molecular mechanisms is needed for a comprehensive understanding of movement's ecological effects.