VU

Trypophloeus alni

Unknown

Overview

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

The leppäkaarnuri faces severe population decline primarily due to the loss of its specialized habitat requirements. As a bark beetle dependent on specific alder species, it is particularly vulnerable to forest management practices that remove dead and dying alder trees, which serve as essential breeding sites. Climate change further threatens the species by altering the moisture and temperature conditions necessary for successful reproduction and larval development.

Threat summary

Habitat

The leppäkaarnuri inhabits alder forests and wetland margins where it breeds exclusively in the bark of dead or dying alder trees (Alnus species). This specialized bark beetle requires specific moisture and temperature conditions found in decaying alder wood, making it highly dependent on natural forest dynamics that maintain a supply of suitable breeding substrate.

Other threatened species in Curculionidae

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Carphoborus rossicus

Unknown
Limnobaris t-albumVU

Limnobaris t-album

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Dorytomus hirtipennis

Unknown
Brachyderes lusitanicusVU

Brachyderes lusitanicus

Unknown

Threatened in Estonia

VU

Lepiota echinella

Unknown
EN

Lyophyllum deliberatum

Unknown
VU

Large Tree-chernes

Dendrochernes cyrneus

Unknown
VU

Lesser White-fronted Goose

Anser erythropus

Declining

Frequently asked questions

Why is Trypophloeus alni classified as Vulnerable?
Trypophloeus alni 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. The leppäkaarnuri faces severe population decline primarily due to the loss of its specialized habitat requirements. As a bark beetle dependent on specific alder species, it is particularly vulnerable to forest management practices that remove dead and dying alder trees, which serve as essential breeding sites. Climate change further threatens the species by altering the moisture and temperature conditions necessary for successful reproduction and larval development.
Where does Trypophloeus alni live?
Trypophloeus alni occurs in Estonia, Finland, Germany, Latvia, Norway, and Poland (plus 2 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 Trypophloeus alni?
The main threats to Trypophloeus alni 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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