Eco-evolutionary dynamics, density-dependent dispersal and collective behaviour: implications for salmon...

Area of Science:

• Ecology
• Evolutionary Biology
• Population Dynamics

Background:

• Dispersal is crucial for metapopulation dynamics, influencing population rescue and fitness.
• Dispersal's dual role involves connecting populations but also introducing maladapted individuals.

Purpose of the Study:

• To investigate the impact of density-dependent dispersal and collective migratory behavior on metapopulation robustness in salmon.
• To explore how these factors interact with habitat heterogeneity and disturbance.

Main Methods:

• Modification of an established eco-evolutionary model for two locally adapted populations.
• Analysis of density-dependent dispersal and collective migratory behavior in salmon populations.

Main Results:

• Low levels of constant straying maximize metapopulation robustness; high straying erodes it.
• Increased collective behavior enhances robustness, but risks trapping populations in low-density states, especially with habitat heterogeneity.
• Density-dependent straying and collective behavior can help salmon metapopulations thrive.

Conclusions:

• Findings suggest density-dependent dispersal and collective movement are key for salmon metapopulation resilience in changing environments.
• These insights are vital for conserving salmon populations facing natural and anthropogenic disturbances.