New research from Curtin University has highlighted the vital role Marri trees (Corymbia calophylla) play in supporting over 80 species of native bees in Western Australia’s South West region, a biodiversity hotspot facing significant threats.
Lead author Dr. Kit Prendergast, an Adjunct Research Fellow at Curtin’s School of Molecular and Life Sciences, emphasized that these trees, classified as ‘near threatened’ since 2019, are crucial for the survival of native bee populations, particularly during late summer when floral resources are scarce.
Dr. Prendergast noted that Marri trees provide essential nectar and pollen, making them a primary food source for many bee species at a time when few other plants are flowering.
“For many bees, Marri is often the only food source available during this period,” he stated.
Marri trees play vital role in supporting over 80 species of native bees.Additionally, these trees offer nesting resources; bees are observed nesting in their small holes and roots, while the tree’s distinctive red sap is utilized by certain bee species to seal their nests.
The study underscores the concept of Marri trees as ‘keystone’ or ‘magnet species’—organisms that are crucial for maintaining the ecological balance.
“The Marri serves as a lifeline during critical periods when other plants have dried up,” Dr. Prendergast explained.
The findings also highlight the urgent need to protect Marri trees from threats including logging, mining, fires, disease, and urban development.
Without these trees, many native bee species would face severe challenges to their survival.
The research calls for concerted conservation efforts to ensure the health of this essential species and the broader ecosystem it supports.
This study was funded by the Forrest Research Foundation, Zanthorrea Nursery, and the Department of Biodiversity, Conservation, and Attractions.