EN

Pandanus calcis

Unknown

Overview

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

Pandanus calcis faces severe threats from limestone quarrying activities that directly destroy its specialized habitat on limestone outcrops. The species' extremely restricted range makes it particularly vulnerable to habitat modification, while its slow growth rate and specific soil requirements limit natural recovery. Urban development pressure in the region further fragments the remaining suitable habitat patches.

Threat summary

Habitat

This endemic pandanus species occurs exclusively on limestone karst formations and rocky outcrops in tropical regions. It requires well-drained, alkaline soils derived from limestone substrates and is typically found in open to semi-shaded conditions on cliff faces and limestone terraces.

Rocky areas· major

Conservation measures underway

Site/area protectionEx-situ conservation

Other threatened species in PANDANACEAE

EN

Benstonea saint-johnii

Unknown
EN

Pandanus leuconotus

Declining
VU

Benstonea fortuita

Stable
VU

Benstonea serpentinica

Stable

Threatened in Thailand

Acropora hemprichiiEN

Acropora hemprichii

Declining
EN

Montipora calcarea

Declining
EN

Wrinkled Hornbill

Rhabdotorrhinus corrugatus

Declining
VU

Mitrephora vulpina

Unknown

Frequently asked questions

Why is Pandanus calcis classified as Endangered?
Pandanus calcis 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. Pandanus calcis faces severe threats from limestone quarrying activities that directly destroy its specialized habitat on limestone outcrops. The species' extremely restricted range makes it particularly vulnerable to habitat modification, while its slow growth rate and specific soil requirements limit natural recovery. Urban development pressure in the region further fragments the remaining suitable habitat patches.
Where does Pandanus calcis live?
Pandanus calcis occurs in Thailand. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Pandanus calcis?
The main threats to Pandanus calcis 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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