Flat-sedge
VU

Flat-sedge

Blysmus compressus

Unknown

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

Overview

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

Flat-sedge faces severe decline due to agricultural intensification and drainage of its specialized wetland habitats. The species is particularly vulnerable to changes in water table levels and nutrient enrichment from agricultural runoff, which alters the delicate chemistry of calcareous fens and wet meadows where it thrives. Habitat fragmentation has isolated remaining populations, reducing genetic diversity and limiting natural recolonization of suitable sites.

Threat summary

Habitat

Flat-sedge inhabits calcareous fens, wet meadows, and marshy grasslands with alkaline soils and consistent moisture levels. The species requires specific hydrological conditions found in base-rich wetlands, often occurring alongside other specialized fen plants in areas with shallow, mineral-rich groundwater.

TERRESTRIAL· major

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Frequently asked questions

Why is Flat-sedge classified as Vulnerable?
Flat-sedge 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. Flat-sedge faces severe decline due to agricultural intensification and drainage of its specialized wetland habitats. The species is particularly vulnerable to changes in water table levels and nutrient enrichment from agricultural runoff, which alters the delicate chemistry of calcareous fens and wet meadows where it thrives. Habitat fragmentation has isolated remaining populations, reducing genetic diversity and limiting natural recolonization of suitable sites.
Where does Flat-sedge live?
Flat-sedge occurs in across multiple regions. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Flat-sedge?
The main threats to Flat-sedge 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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