Keeping Up with Insect Pollinators in Paris.

Area of Science:

• Urban Ecology
• Conservation Biology
• Entomology

Background:

• Urbanization poses risks to pollinator populations through habitat loss and biotic homogenization.
• Despite dense urban landscapes, insect pollinators have been documented in cities like Paris.
• Understanding urban pollinator diversity is crucial for effective conservation.

Purpose of the Study:

• To assess the taxonomic and functional diversity of wild bees and hoverflies in Parisian green spaces.
• To update existing knowledge on pollinator species richness in a highly urbanized area.
• To identify factors influencing pollinator diversity in urban environments.

Main Methods:

• Conducted two-year in-depth surveys across various Parisian green spaces.
• Monitored pollinator activity throughout their seasonal cycles.
• Identified and cataloged wild bee and hoverfly species, noting their functional traits and conservation status.

Main Results:

• Documented 118 wild bee species and 37 hoverfly species, adding 32 new species to existing records.
• Observed significant functional diversity in bee assemblages, including parasitic and oligolectic species.
• Found that green spaces with diverse habitats and ecological management exhibited the highest taxonomic and functional diversity.
• Identified several bee and hoverfly species with special conservation status.

Conclusions:

• Paris harbors a surprisingly rich diversity of wild bees and hoverflies, with nearly half of the regional species found within the city.
• Ecologically managed green spaces with multiple habitats are key to supporting urban pollinator diversity.
• Dense urban areas represent important habitats for pollinators, necessitating their inclusion in conservation strategies.