oostelijke sapzweefvlieg
EN

oostelijke sapzweefvlieg

Brachyopa pilosa

UnknownLCEULCEU

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

Overview

A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.

The oostelijke sapzweefvlieg faces severe population decline due to the loss of ancient deciduous forests containing the large, hollow trees essential for its larval development. Intensive forest management practices that remove dead and dying trees eliminate the sap-run microhabitats where larvae feed on fermenting tree sap. Climate change compounds these pressures by altering forest composition and reducing the availability of suitable host trees with the specific moisture and decay conditions this specialist hoverfly requires.

Threat summary

Habitat

This specialist hoverfly inhabits ancient deciduous forests, particularly those containing large, mature trees with natural hollows and sap runs. The larvae develop exclusively in tree holes filled with fermenting sap, requiring specific moisture and decay conditions found only in old-growth woodland ecosystems.

Other threatened species in Syrphidae

CR

Merodon longispina

Unknown
saksische fopwespCR

saksische fopwesp

Chrysotoxum verralli

Unknown
zwartpootgitjeCR

zwartpootgitje

Cheilosia nigripes

Unknown
piemelkrieltjeEN

piemelkrieltje

Paragus tibialis

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Threatened in Åland Islands

Calidris ferrugineaVU

Calidris ferruginea

Declining
VU

Syndyas nigripes

Unknown
Chrysotus cupreusCR

Chrysotus cupreus

Unknown
VU

narulukkokiiluri

Syntormon filiger

Unknown

Frequently asked questions

Why is oostelijke sapzweefvlieg classified as Endangered?
oostelijke sapzweefvlieg is classified as Endangered — facing a very high risk of extinction in the wild — because population numbers are declining steeply and key habitats are under sustained pressure. The oostelijke sapzweefvlieg faces severe population decline due to the loss of ancient deciduous forests containing the large, hollow trees essential for its larval development. Intensive forest management practices that remove dead and dying trees eliminate the sap-run microhabitats where larvae feed on fermenting tree sap. Climate change compounds these pressures by altering forest composition and reducing the availability of suitable host trees with the specific moisture and decay conditions this specialist hoverfly requires.
Where does oostelijke sapzweefvlieg live?
oostelijke sapzweefvlieg occurs in Åland Islands, Austria, Belgium, Bulgaria, Denmark, and Estonia (plus 14 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 oostelijke sapzweefvlieg?
The main threats to oostelijke sapzweefvlieg 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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