Central Research Questions
This project is led by Nicklas Jansson. Its objectives are to evaluate biodiversity by assessing the variety of species, particularly saproxylic beetles, associated with different oak tree characteristics; to compare living and dead trees by examining how the biodiversity in living oaks compares with that in dead or decaying ones; and to provide conservation insights by developing recommendations for managing oak habitats to enhance biodiversity conservation.
Background and Aims
This project investigates the impact of various characteristics of oak trees, such as age, whether they are dead or alive, and their structural features, on biodiversity. The primary focus is on the ecological roles these oaks play in supporting different species, especially saproxylic beetles, which depend on dead or decaying wood for their lifecycle. Key characteristics studied include tree age, investigating the biodiversity supported by oaks at various life stages from young to ancient trees. The study also compares living and dead trees, examining the species found in living oaks against those found in dead or decaying trees. Structural features are examined as well, looking at how trunk size, presence of hollows, and canopy cover influence biodiversity. This research underscores the vital role that oaks, with their diverse characteristics, play in supporting biodiversity. By understanding these relationships, the study provides valuable insights for conservation strategies aimed at preserving these important habitats.
Methods
The study is conducted in a region with a high density of old oaks, including both living and dead trees. Methods like flight interception traps are used to collect data on species, particularly beetles, associated with these oaks. Data are analyzed to determine how different characteristics of the oaks correlate with the presence and diversity of various species.
Preliminary findings
High biodiversity: both living and dead oaks are crucial habitats, supporting a rich diversity of species, especially saproxylic beetles.
Unique species assemblages: different assemblages of species are found depending on whether the oaks are alive or dead, highlighting the importance of both in conservation.
Significant factors: attributes such as trunk size, presence of hollows, and tree age significantly influence the types and numbers of species present.