Urban Environments Promote Adaptation to Multiple Stressors

Area of Science:

• Marine biology
• Ecology
• Evolutionary biology

Background:

• Anthropogenic activities significantly alter global environments, impacting biodiversity and ecosystem services.
• Urban areas, heavily modified from natural habitats, are increasingly populated by humans and wildlife.
• Understanding species adaptation to human-altered environments is crucial for conservation and ecological management.

Purpose of the Study:

• To investigate the adaptive capacity of marine organisms to environmental stressors in human-altered habitats.
• To compare the tolerance of marine taxa from protected versus impacted environments.

Main Methods:

• Conducted extensive stress experiments on three marine taxa: one mussel and two gammarid species.
• Assessed intraspecific population tolerance to varying salinity, temperature, and partial pressure of carbon dioxide (pCO2) levels.
• Compared populations originating from protected and human-altered (urban) habitats.

Main Results:

• Populations from human-altered habitats generally exhibited higher tolerance to environmental stressors compared to those from protected habitats.
• Individuals from the most impacted urban environments demonstrated the greatest robustness.
• Adaptation to disturbed environments appears to enhance survival and resilience in these marine species.

Conclusions:

• Urban marine populations are evolving increased resilience to environmental change, driven by anthropogenic pressures.
• These adapted populations could serve as resilient sources for ecosystem recovery but may also pose an increased risk for invasive species.
• Further research is needed to fully understand the implications of urban adaptation for biodiversity and ecosystem function.