Plants' Contributions to People Shift With Glacier Extinction

Area of Science:

• Ecology and Conservation Biology
• Climate Change Impacts
• Ecosystem Services Assessment

Background:

• Alpine environments are highly vulnerable to climate change, with glacier retreat causing significant alterations in plant communities and biodiversity.
• The socio-economic consequences of these biodiversity shifts, particularly concerning Nature's Contributions to People (NCP), are understudied.
• Existing NCP frameworks often focus on landscape-level assessments, necessitating a species-specific approach for glacial ecosystems.

Purpose of the Study:

• To introduce and apply the novel concept of Plants' Contributions to People (PCP) to assess the ecological, social, and economic significance of plant biodiversity in glacial environments.
• To evaluate the impact of glacier extinction and biodiversity loss on specific PCP.
• To provide a practical framework for conservation and policy decisions in rapidly changing alpine ecosystems.

Main Methods:

• Surveyed 99 plant species across four Italian Alps glacier environments, noting two glaciers facing extinction.
• Categorized plant species into successional stages (early, intermediate, late) and linked them to 13 distinct PCP through literature review.
• Assessed changes in PCP by comparing present and projected future scenarios under glacier extinction, focusing on species richness decline.

Main Results:

• Changes in PCP are predominantly driven by reduced plant species richness, leading to a sevenfold average decrease in contributions to air quality, soil health, and nutrient regulation.
• While natural hazard regulation remained stable, associations with pest and disease control increased, particularly for late successional species.
• Biodiversity loss due to glacier extinction results in a decrease in the volume of species-specific contributions, even if qualitatively similar future communities emerge.

Conclusions:

• The study provides the first evidence of a shift towards erosion of PCP linked to declining plant species richness in alpine glacial environments.
• Plants' Contributions to People (PCP) serves as a valuable tool for assessing the ecological and socio-economic consequences of biodiversity change.
• This research highlights the biodiversity crisis in glacial ecosystems and informs conservation strategies to sustain vital ecosystem functions amidst global change.