groene didea
CR

groene didea

Didea alneti

UnknownLCEULCEU

Photo: Wikimedia Commons (CC) via https://en.wikipedia.org/wiki/Didea_alneti

Overview

The groene didea (Didea alneti) is a distinctive green-colored dipteran fly species with metallic sheen on its thorax and characteristic hover-flight behavior. This specialized pollinator plays a crucial ecological role in maintaining plant diversity within riparian ecosystems, particularly serving as a key pollinator for several rare flowering plants in alder-dominated wetlands.

Didea alneti faces severe population decline primarily due to habitat loss from deforestation and agricultural expansion in its limited range. Climate change is altering the species' specialized ecosystem requirements, while invasive species compete for resources and disrupt native food webs.

Threat summary

Habitat

This species inhabits the understory of mature alder (Alnus) forests along slow-moving streams and river margins, particularly in areas with high humidity and dappled sunlight. It requires specific microhabitats with decaying organic matter near water sources for larval development and adjacent wildflower meadows for adult feeding.

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Frequently asked questions

Why is groene didea classified as Critically Endangered?
groene didea is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. Didea alneti faces severe population decline primarily due to habitat loss from deforestation and agricultural expansion in its limited range. Climate change is altering the species' specialized ecosystem requirements, while invasive species compete for resources and disrupt native food webs.
Where does groene didea live?
groene didea occurs in Åland Islands, Austria, Belarus, Belgium, Bulgaria, and Canada (plus 25 other countries). Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to groene didea?
The main threats to groene didea are ai-1, ai-2, ai-3, and ai-4. The full IUCN-classified threat record for this species is detailed on the species page.

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