The University of Angers is advancing the Popact initiative, a participatory science project designed to monitor urban biodiversity through the collection and identification of city plants. In collaboration with the Muséum des sciences naturelles d’Angers, the program engages citizens in gathering botanical data to better understand how plant species adapt and survive within urban environments, according to official university communications.
Popact functions as a bridge between academic research and public engagement, utilizing a “citizen science” model where non-professionals contribute to scientific data collection. By documenting the presence and distribution of urban flora, the project provides researchers with a larger dataset than traditional academic sampling could produce alone. This effort is specifically tied to the broader goals of the Muséum des sciences naturelles d’Angers to catalog regional biodiversity.
The initiative focuses on the “urban harvest” of plants, which involves identifying species that have colonized sidewalks, walls, and abandoned lots. These plants often represent resilient species or invasive varieties that offer insights into climate change and urban heat island effects. The University of Angers coordinates the technical framework of the project, ensuring that the data collected by volunteers meets scientific standards for botanical recording.
Collaboration with Muséum des sciences naturelles d’Angers
The partnership between the University of Angers and the Muséum des sciences naturelles d’Angers is the operational core of Popact. The museum provides the taxonomic expertise and herbarium resources necessary to verify the species collected by the public. This verification process is critical, as it transforms a casual observation into a verified scientific record that can be used in peer-reviewed research.
According to the program’s framework, the collection process involves documenting the exact location and state of the plant. This geospatial data allows researchers to map “green corridors” within the city, identifying how plants migrate through urban infrastructure. The Muséum des sciences naturelles d’Angers serves as the primary repository for these findings, integrating them into the wider natural history records of the Maine-et-Loire department.
The Role of Participatory Science in Urban Ecology
Participatory science, or citizen science, is the methodology driving Popact. By decentralizing the collection process, the University of Angers can monitor a wider variety of micro-climates across the city simultaneously. This approach is particularly effective for urban ecology, where a single street corner might have a significantly different botanical makeup than a park just one block away due to differences in soil, shade, and pollution.
The project aims to educate participants on the importance of “spontaneous vegetation”—plants that grow without human intervention. These species are often dismissed as weeds, but the Popact project highlights their role in supporting urban pollinators and managing stormwater runoff. The University of Angers utilizes these activities to promote environmental literacy among the local population.
Impact on Biodiversity Monitoring and Urban Planning
The data generated by Popact has implications for how city officials view urban greenery. By identifying which species thrive in specific urban conditions, the project provides a blueprint for “nature in the city” initiatives. This includes selecting native plants for urban renewal projects that are more likely to survive and support local insects and birds.
The program also contributes to the understanding of “anthropogenic” influence on evolution. Researchers analyze how plants in the city of Angers may be evolving differently from their rural counterparts to cope with higher levels of CO2 and fragmented habitats. This longitudinal data helps the University of Angers contribute to global studies on urban biodiversity loss and resilience.

For those interested in participating or viewing the results of the botanical harvests, updates are typically provided through the University of Angers official portals and the Muséum des sciences naturelles d’Angers public exhibits.
The project continues to refine its collection protocols for the current season. The next phase involves the analysis of the most recent harvest cycle to determine if any new invasive species have entered the urban perimeter of Angers.
Do you live in Angers and participate in citizen science? Share your experiences with urban plant spotting in the comments below.
Related reading