Effects of rapid evolution on species coexistence

Area of Science:

• Ecology
• Evolutionary Biology
• Population Dynamics

Background:

• Species diversity maintenance is influenced by ecological and evolutionary processes.
• Interspecific competition can drive trait evolution, potentially leading to niche differentiation and species coexistence.
• The impact of evolution on the population dynamics of competing species (eco-evolutionary feedback) remains under-resolved.

Purpose of the Study:

• To investigate how rapid evolution in response to interspecific competition affects the population dynamics of competing aquatic plant species.
• To determine if evolutionary changes alter competitive hierarchies and population trajectories.
• To explore the role of eco-evolutionary feedbacks in maintaining species diversity.

Main Methods:

• Experimental manipulation of interspecific competition in aquatic plant communities over 10-15 generations.
• Controlled field experiments using experimental ponds.
• Monitoring of genotypic and phenotypic changes in response to competitive pressures.

Main Results:

• Interspecific competition induced rapid genotypic evolution in aquatic plants.
• Evolutionary changes led to the convergence of population trajectories between competing species.
• Despite evolutionary shifts, the outcome of species coexistence remained unchanged.
• Genotypic evolution resulted in phenotypic changes that modified the competitive hierarchy, contrary to expectations of niche differentiation.

Conclusions:

• Rapid evolution, driven by interspecific competition, significantly alters population dynamics.
• Eco-evolutionary feedbacks play a crucial role in regulating species interactions and potentially maintaining community diversity.
• Competition for essential resources may constrain the evolution of niche differentiation, leading to altered competitive hierarchies instead.