Species interactions alter evolutionary responses to a novel environment.

Area of Science:

• Evolutionary biology
• Ecology
• Microbial ecology

Background:

• Evolutionary studies often focus on single species, neglecting complex interactions in natural settings.
• Species interactions are theorized to influence adaptation to environmental change and ecosystem functioning.

Purpose of the Study:

• To investigate the impact of species interactions on adaptation to novel environments.
• To determine if evolved species interactions alter ecosystem functioning.

Main Methods:

• Experimental evolution using five bacterial species in monocultures and polycultures.
• Assessing adaptation through growth rates and resource utilization (NMR spectroscopy).
• Comparing ecosystem productivity of communities evolved in monoculture versus polyculture.

Main Results:

• Species in communities diverged resource use and evolved to utilize waste products from other species.
• A trade-off was observed between adaptation to abiotic and biotic factors, with community-evolved species showing lower monoculture growth rates.
• All species evolved more in communities than in monocultures, as evidenced by growth assays and NMR.
• Polyculture-evolved communities exhibited higher productivity than monoculture-evolved communities.

Conclusions:

• Species adaptation to new environments is critically dependent on the biotic interactions with co-occurring species.
• Predicting ecosystem responses to environmental change necessitates understanding the evolution of species interactions.