Tree Microhabitats and Forest Biodiversity Conservation

Forest ecosystems harbour a multitude of structural features, among which tree microhabitats play a pivotal role in sustaining biodiversity. Tree microhabitats are discrete features on living or dead trees—such as cavities, cracks, bark fissures, dead branches and epixylic substrates—that provide essential refuge, breeding sites and foraging substrates for a wide range of organisms, including invertebrates, birds, bats, fungi, lichens and bryophytes. The presence and diversity of these microhabitats are influenced by species identity, tree size, age, health status and past management. Large veteran trees and standing deadwood typically support the richest assemblages of microhabitats and associated fauna and flora. Within managed forests, integrating microhabitat inventories into harvesting and thinning operations enables the retention of key structural elements that underpin ecological resilience. At broader scales, monitoring microhabitat patterns reveals the impacts of climate variation and anthropogenic pressures on forest biodiversity, guiding adaptive management that balances timber production with conservation objectives. The global significance of tree microhabitats lies in their role as accessible indicators of forest health and as practical targets for retention forestry, continuous-cover approaches and restoration interventions aimed at enhancing landscape-level connectivity and ecosystem service delivery.

Research from Nature Portfolio

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Tree Microhabitats and Forest Biodiversity Conservation publication trend

The graph below shows the total number of articles in tree microhabitats and forest biodiversity conservation across all publications each year (not limited to Nature Index journals).

Technical terms

Tree-related microhabitat (TreM): A distinct structural feature on a living or dead tree—such as cavities, cracks, dead branches or bark fissures—that supports specialised forest species.

Retention forestry: A forest management approach that deliberately retains selected living and dead trees during harvesting to maintain structural complexity and biodiversity.

Epixylic substrate: Decaying wood surfaces on trees that host specialised assemblages of lichens, bryophytes and saproxylic invertebrates.

Halo thinning: A silvicultural practice involving the selective removal of surrounding trees to enhance light and space around target veteran trees.

References

1. Variation in the diversity and composition of tree-related microhabitats across climate and human impact gradients on a tropical mountain. Ecological Indicators (2024).
2. Retention as an integrated biodiversity conservation approach for continuous-cover forestry in Europe. Ambio (2019).
3. The Use of Tree-Related Microhabitats as Forest Biodiversity Indicators and to Guide Integrated Forest Management. Current Forestry Reports (2021).