VU

Pisidium johnsoni

Unknown

Overview

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

Pisidium johnsoni faces severe threats from habitat degradation and water quality deterioration in its limited freshwater environments. Agricultural runoff, urban development, and pollution have significantly impacted the pristine water conditions this species requires. Climate change-induced alterations to precipitation patterns and water temperature further stress remaining populations in their restricted range.

Threat summary

Habitat

This freshwater bivalve inhabits clean, well-oxygenated streams, springs, and small rivers with sandy or gravelly substrates. It requires stable water conditions with minimal pollution and is typically found in areas with consistent water flow and temperature.

Artificial - Aquatic & marine· major

Other threatened species in SPHAERIIDAE

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VU

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Frequently asked questions

Why is Pisidium johnsoni classified as Vulnerable?
Pisidium johnsoni 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. Pisidium johnsoni faces severe threats from habitat degradation and water quality deterioration in its limited freshwater environments. Agricultural runoff, urban development, and pollution have significantly impacted the pristine water conditions this species requires. Climate change-induced alterations to precipitation patterns and water temperature further stress remaining populations in their restricted range.
Where does Pisidium johnsoni live?
Pisidium johnsoni occurs in Madagascar. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Pisidium johnsoni?
The main threats to Pisidium johnsoni 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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