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Juliana sweep-netting bees as part of her PhD research
Native bee populations in Australia are under immense pressure, posing a serious threat to the ecosystems they support. As vital pollinators, their decline could have far-reaching consequences for biodiversity and the stability of global food systems. Land clearing for urban development and agriculture has destroyed intact habitat and altered the availability of flowers. Compounding to this, European honeybees introduced 200 years ago for honey production, often outcompete native bees for floral resources. This combination of habitat loss and competition for floral resources is pushing native bees towards the brink of collapse.
A recent study in fragmented Banksia woodlands in Western Australia sheds new light on the challenges native bees face. It found that even when remnant vegetation is preserved, the surrounding landscape plays a crucial role in providing enough food for bees to thrive.
Led by Dr. Juliana Pille Arnold from Biologic’s Terrestrial Invertebrates team, this groundbreaking study was conducted as part of her PhD research. The study investigated bee populations, their interactions with plants, flower density in various land uses, and the energy content of nectar and pollen of the flowers they visit.
“Bees depend entirely on nectar and pollen for nutrition and their ability to reproduce is greatly affected by the availability of floral resources,” she explained.
Trichocolletes erythrurus, one of Western Australia’s large-bodied native bees, is facing growing pressure from the decline in floral resources driven by habitat loss.
Collaborating with ecologists from The University of Western Australia (UWA), the University of Canterbury in New Zealand, and CSIRO, the research team discovered a direct link between bee body size and survival challenges. Larger bees, which require more energy to fly and survive, are particularly vulnerable to food shortages.
“Our study found that both small and large bees thrive in woodland remnants when their preferred flowers are abundant in the surrounding landscape. However, larger bees are especially at risk when food resources are limited,” Dr. Pille Arnold said.
She emphasised the implications of this research for conservation and urban planning, since much of the habitat loss is due to land clearing and urban development.
“Natural habitats are being replaced at alarming rates, while only small fragments of the once continuous Banksia woodland remain. Managing the land surrounding these remnants is essential to reconnect habitats and reduce the impacts on native bees and other pollinators.”
She also stressed the need for action: “Steps such as reduced land clearing, restoring natural habitats, planting native plants in gardens and parks, and improving development policies and regulations can make a significant difference.
Baniska Woodland the backdrop to Juliana’s PhD research
Moreover, Australian native bees remain understudied, and the full extent of threats they face is largely unknown. More comprehensive surveys and research into their biology and ecology are crucial to support effective conservation”.
To learn more from our expertise on insect pollinators, including native bees, or to get support on integrating pollinators into biodiversity surveys, monitoring, and management plans, please contact us.
To explore Dr Juliana Pille Arnold’s research paper and PhD work, click the links here:
https://royalsocietypublishing.org/doi/10.1098/rspb.2023.2771
