Evolutionary Dynamics at the Leading Edge of Biological Invasions.

Area of Science:

• Evolutionary biology
• Ecology
• Mathematical modeling

Background:

• Species' range expansions are often accompanied by evolutionary changes.
• Dispersal ability is frequently selected for at the invasion front, increasing spread speed.
• Increased dispersal can incur fitness costs, creating evolutionary trade-offs.

Purpose of the Study:

• To investigate the evolutionary dynamics during species' range expansion.
• To understand how selection on dispersal affects spreading speed and fitness.
• To determine conditions favoring phenotypic plasticity in dispersal.

Main Methods:

• Utilized reaction-diffusion equations to model spatial spread.
• Employed adaptive dynamics to analyze evolutionary trajectories.
• Examined various dispersal-reproduction trade-off scenarios.

Main Results:

• Evolutionary processes at the invasion front can maximize asymptotic spreading speed.
• Phenotypic plasticity in dispersal can be favored under specific trade-off conditions.
• Identified key factors influencing the evolution of dispersal during range expansions.

Conclusions:

• Evolutionary adaptation plays a crucial role in shaping species' range expansion dynamics.
• The interplay between dispersal, reproduction, and fitness costs dictates evolutionary outcomes.
• The modeling framework offers insights applicable to diverse taxa and ecological systems.