Thryogenes nereis
VU

Thryogenes nereis

Local name: knappsävsvivel

Unknown

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

Overview

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

Thryogenes nereis faces significant pressure from agricultural intensification and habitat fragmentation across its Scandinavian range. The species' specialized feeding requirements on specific sedge communities make it particularly vulnerable to changes in wetland management practices. Climate-driven shifts in precipitation patterns are altering the hydrology of its preferred bog and fen habitats, while increased nitrogen deposition from agricultural runoff degrades the oligotrophic conditions this weevil requires.

Threat summary

Habitat

This specialized weevil inhabits nutrient-poor wetlands including sphagnum bogs, sedge fens, and marshy areas with specific Carex sedge species. It requires stable water levels and oligotrophic conditions typical of undisturbed northern European peatlands.

Other threatened species in Brachyceridae

VU

Grypus brunnirostris

Unknown

Threatened in Austria

Calidris ferrugineaVU

Calidris ferruginea

Declining
Anthophore estivaleCR

Anthophore estivale

Anthophora aestivalis

Unknown
Adonis BlueVU

Adonis Blue

Lysandra bellargus

Unknown
agnhodeedderkoppCR

agnhodeedderkopp

Walckenaeria alticeps

Unknown

Frequently asked questions

Why is knappsävsvivel classified as Vulnerable?
knappsävsvivel is classified as Vulnerable because the population is declining and the species faces a high risk of extinction in the medium-term future if current pressures continue. Thryogenes nereis faces significant pressure from agricultural intensification and habitat fragmentation across its Scandinavian range. The species' specialized feeding requirements on specific sedge communities make it particularly vulnerable to changes in wetland management practices. Climate-driven shifts in precipitation patterns are altering the hydrology of its preferred bog and fen habitats, while increased nitrogen deposition from agricultural runoff degrades the oligotrophic conditions this weevil requires.
Where does knappsävsvivel live?
knappsävsvivel occurs in Austria, Belgium, Bulgaria, Denmark, Estonia, and Finland (plus 13 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 knappsävsvivel?
The main threats to knappsävsvivel 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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