Doctoral defence: Maarja Kõrkjas "Dynamics of tree-related microhabitats in live forest trees and its links with biodiversity"

On 14. February at 10.15 Maarja Kõrkjas will defend her doctoral thesis "Dynamics of tree-related microhabitats in live forest trees and its links with biodiversity" for obtaining the degree of Doctor of Philosophy (in Zoology and Ecology).

Supervisors:
Professor Asko Lõhmus, University of Tartu
Research Fellow Liina Remm, University of Tartu

Opponent:
Senior Lecturer Panu Halme, University of Jyväskylä (Finland)

This thesis investigates the development, persistence, and ecological significance of tree-related microhabitats (TreMs) in live trees – features like cavities, cracks, and loose bark that enhance forest habitat complexity and support a wide range of organisms. This thesis aims to gain a deeper understanding of how trees develop their habitat value through TreM dynamics. Focusing on Norway spruce and European aspen in Estonia, the research examines how tree characteristics and stand-level factors influence the occurrence and diversity of TreMs, revealing that TreM development is a complex process driven by factors such as tree age, size, species, habitat conditions, and disturbances. In managed forests in Estonia, there were generally few TreMs and some types were not found during fieldwork. While TreMs increase habitat complexity, their impact on biodiversity can vary depending on tree age and the organism group studied. This thesis highlights the importance of a precautionary approach to forest management to promote diverse TreMs across various tree species and ages. This includes retaining trees with existing TreMs and promoting natural processes that lead to TreM formation at the landscape level, ultimately contributing to forest ecosystems' long-term health, resilience, and biodiversity.

The doctoral thesis defense can also be followed online: https://ut-ee.zoom.us/j/92512502184?pwd=bQo2Tbu9i3J1PHZVVx5j0ajpVoHJzj.1

(Meeting ID 925 1250 2184, Passcode: 640494)