Planetary Health NewsStrengthening community and restoring the health of our planet.
Australia’s native bees struggled after the Black Summer fires – but a world-first solution brought them buzzing back
Photo: Kit Prendergast (@bee.babette_performer)
After a devastating bushfire, efforts to help nature recover typically focus on vertebrates and plants. Yet extreme fires can threaten insects, too.
After the Black Summer fires of 2019–20, I embarked on world-first research into whether “bee hotels” – a type of artificial nesting structure – could help native bees recolonise an area.
I installed 1,000 bee hotels in the Jarrah forests of Western Australia, parts of which burned during the Black Summer fires.
After months of monitoring, I concluded – with great excitement and relief – that the project was a success. Native bees were using the structures to lay eggs and raise young. The work shows pollinators such as bees can be aided after fires, to help bring damaged landscapes back to life.
WA’s Jarrah Forest was affected by the Black Summer fires. Photo: Kit Prendergast
Native bees typically nest in holes in trees that occur naturally when beetles bore through wood. When fire destroys trees, bees can be left without a place to nest and reproduce. This prevents them from recolonising habitats after fire.
Under climate change, bushfires in Australia are becoming more frequent and severe. Wood-nesting bees are especially vulnerable to bushfires. For example, fires are recognised as a major threat to the glittering green carpenter bee (Xylocopa aerata), which creates its own holes in wood to nest in.
The worsening fires take place at a time when global populations of wild pollinators, such as bees, are in steady decline. This problem has been well-publicised, although the plight of Australia’s native bees has received less attention.
My research tested whether bee hotels could help our native bees bounce back after fire.
What the research found
The Jarrah Forest of southwest Western Australia is a biodiversity hotspot. The 1,000 bee hotels were installed across five sites in the northern part of the forest, where bushfires burned during the summer of 2019–20.
One type of bee hotel used by the researcher. Photo: Kit Prendergast
Bee hotels replicate the holes in wood that native bees nest in. In August 2021, I installed bee hotels of two types: wooden blocks with 15 holes drilled in them, and bunches of about 50 bamboo stems bundled together. I monitored them from September 2021 to March 2022.
At the end of the period I concluded – with great excitement and relief – that the project was a success. Across all bee hotels at the five sites, 832 cavities were occupied by native bees.
Assuming four cells per cavity for each offspring, this meant more than 3,300 native bees would likely emerge in the next generation.
Uptake by bees was initially slow. This was to be expected, because the main group of species that used bee hotels – from the Megachile genus – tend to not be active in the region until late spring.
I found the nests were also used by bees of the genus Hylaeus, as well as tiny Exoneura bees. Other inhabitants included wasps, spiders, ants and crickets.
I also surveyed three burnt sites where bee hotels were not installed. There, I recorded the numbers of native bees foraging on flowers, and compared it to the sites with bee hotels. More native bees were present at the latter sites, which reinforced my findings.
Importantly, the research allowed natural recolonisation. It did not involve installing bee hotels at unburnt sites, then moving them to burnt areas once they were occupied. This could have been disastrous.
A bee at the entrance of the bee hotel. Photo: Kit Prendergast
Aside from depleting one population, it may have meant native bees were moved to an area where there were not enough flowers, or were forced to compete with existing bee populations.
The research also showed European honey bees could pose a problem for native bees in fire-damaged landscapes. At sites with a higher density of honey bees, fewer native bees were foraging and fewer nests were occupied in the bee hotels.
This supports previous findings by myself and others that honey bees can negativelyaffect native bees. It adds further evidence that honey bees should not be permitted in sensitive habitats, such as bushland following fire or in national parks.
Empowering bee-saving efforts
My research provides proof that bee hotels can aid in the recovery of cavity-nesting native bees after fires.
This work fills a major gap. While there has been much attention on the recovery of furry animals and plants after fires, there has been far less investment into the recovery of plant pollinators.
Are there native bees and insects in your garden? Today is the first day of Australian Pollinator Week and native bee ecologist and musician @amelie_ecology has just released a new single with Costa Georgiadis @costasworld called ‘Not all Pests’. We’re thrilled that Amelie will be performing her songs and running a free interactive workshop on what we can do to support our native pollinators at the Planetary Health Expo and Family Day on Saturday 22nd November. You can register to attend here (link in profile): https://bit.ly/4nFrY1J
and you can stream ’Not all Pests’ here (link in profile): https://amelieecology.bandcamp.com/track/not-all-pests
There are so many ways to have a greener healthier Christmas! Ever thought of giving a voucher for Tai Chi and Qigong classes? You can try out one of our Qigong classes at the Planetary Health Centre this Saturday at 9am. Tutor Virginia Field is currently introducing Qigong`s 5-Animals Play, an ancient practice which developed from observing animals and mimicking their behaviour. Reserve a spot here (link in profile): https://bit.ly/3JlOAXh Find other ideas for a greener Christmas on Council`s website here: www.bmcc.nsw.gov.au/greenchristmas
Or come along to our Expo and Family Day on 22 November and try out some other great options like drumming classes, sewing and fashion upcycling! Register to attend here (link in profile): https://events.humanitix.com/disaster-risk-awareness-expo-or-full-cycle-2025
We’ve had some great news! Santa is coming to the free Community BBQ at the Planetary Health Centre Expo in Katoomba on Saturday 22 November. He’s arriving early to help us celebrate Christmas in a way that’s safer and healthier for us and the planet, and he’s let us know that he’ll be giving everyone who comes a free fire-retardant plant for their garden. We’re so thrilled we’re putting on fun family events for the day: from a fabulous free drumming workshop with Emily from Hands, Heart and Feet, to live music and a pollinator hunt with Amelie Ecology, and workshops to create plastic-free Christmas presents. There’ll also be an opportunity to meet the RFS, NSW Fire & Rescue, Red Cross and other emergency services. Come and learn ways to keep the family safe while also having fun, enjoying a coffee, sampling some plant-based sweets and a free BBQ lunch, and taking home lots of useful information about hazardous materials and preparing for extreme weather events! Register here to attend (link in profile): https://events.humanitix.com/disaster-risk-awareness-expo-or-full-cycle-2025?
Do you feel overwhelmed about preparing your home for bushfire? Come along to the free Bushfire Retrofit Toolkit Workshop at the Disaster Risk Awareness Expo (and pre-Christmas Family Day) at the Planetary Health Centre in Katoomba on Saturday 22 Nov. Meet the team who developed the Toolkit and learn to use it in a free, 2-hour interactive workshop. You will have the opportunity to work on case study properties in small groups and ask the team questions about your own property. Free afternoon tea provided. Bookings essential here (Disaster Risk Awareness Expo link in profile): https://events.humanitix.com/disaster-risk-awareness-expo-or-full-cycle-2025/tickets #beprepared #bushfire #retrofit #disasterriskawareness #planetaryhealth #katoomba #bluemountains #bushfireretrofittoolkit...
When we pulled up some old lino we were shocked to learn at the Katoomba Resource Recovery and Waste Management Facility that it was made of asbestos. There are so many parts of old homes in the Blue Mountains that contain asbestos, so, to help keep everyone safe, we`ve invited Betty the Asbestos Education House to the Planetary Health Centre on Saturday 22nd November as part of our Disaster Risk Awareness Expo and pre-Christmas Family Day. Betty is a purpose built, mobile model home designed to demonstrate where asbestos might be found in and around any Australian home built or renovated before 1990. Her exterior resembles a typical fibro home but when opened up, she has extensive audio and visual information including a bathroom, kitchen, living room, man shed/garage and a dog house. You can learn more and register to attend this free event here (link in profile): www.fullcycleconference.com.au
Yesterday we launched the Upper Mountains Seed Saving and Gardening Group at the Planetary Health Centre. It`s the perfect time to get planting so we shared locally acclimatised seeds for a variety of beans (they don`t cross-pollinate so you can plant as many varieties as you can fit in!), round yellow zucchinis, Japanese pumpkins and Roi de Carouby peas. Seeds are arguably one of the best return on investments you can make in your life. Plant one tiny celery seed and when that plant goes to seed you can harvest thousands to replant and to sprout and add to your salads. We`ll be meeting on the first Saturday of every month as part of Skill Share Saturdays at the Planetary Health Centre. Our next meeting will be Saturday 6 Dec. Register here if you`d like to attend (link in profile): https://events.humanitix.com/copy-of-upper-mountains-seed-saving-and-gardening-group?
The KTOWN pickers - Katoombans Taking On Waste Now - are clearing litter from local tracks and streets and stopping it from entering our waterways and eventually our water supply. Read more in Katoomba Area Local News (link in profile): https://www.katoombalocalnews.com/ktown-katoombans-taking-on-waste-now/
This Saturday will be the first meeting of the Upper Mountains Seed Saving and Gardening Group at the Planetary Health Centre, starting at 10am. Register your interest here (link in profile): https://bit.ly/3LalNFy
It will be followed by the Planetary Health Bushcare group at 1.30pm. Register your interest here (link in profile): https://bit.ly/49k8PPo
Global poisoning by a tsunami of toxins that are flooding the planet is fast becoming the biggest threat to life on earth. Extreme weather events like fire and flood accelerate this chemical pollution. To address this the Planetary Health Centre`s Full Cycle 2025 conference from 20-22 Nov is bringing together leading experts in managing extreme weather events as well as those who are working on reducing the risk of hazardous materials like asbestos and PFAS. According to keynote speaker Julian Cribb:
"The poisoning of our planet through human chemical emissions is arguably the largest human impact of all upon the Earth. In volume, it is four to five times greater than our climate emissions (which are a part of it), and three times more lethal than the estimated climate death-toll. It is the mega-threat least understood by society, monitored by science or regulated by government. It has mainly occurred over the last 50 years, due to a massive global surge in chemical use and materials extraction.
Scientific assessment has identified more than 350,000 man-made chemicals. The US Department of Health estimates 2000 new chemicals go on the market every year and the Smithsonian says 1000 new compounds are now being synthesised every hour. The UN Environment Program warns about a third of these “are persistent, able to accumulate in humans and animals and are toxic”.
The World Health Organisation estimates that 13.7 million people — one in every four — die each year from diseases caused by “air, water and soil pollution, chemical exposures, climate change and ultraviolet radiation”, caused by human activity.
Human chemical emissions are thus responsible for the largest mass killing in history.
Learn more and register for the conference here (link in profile): www.fullcycleconference.com.au
There will be a free community expo on Saturday 22 November at the Planetary Health Centre in Katoomba.
Conference volunteers receive free registration. Email planetaryhealthevents@bmcc.nsw.gov.au if you’d like to volunteer at this critically important event.
T`ai-chi and Qigong routines can increase mobility and strength, improve immunity and help build an inner calm. To get the greatest health impact you need to practice them on a regular basis, so we`re thrilled to now be offering a 6-week block of classes to take you into summer starting 9am this Saturday 1 November and running until Sat 6 December. Bookings essential here (link in profile): https://bit.ly/4qrw4Nx This Saturday, 1 November, the activity is also the first in a full day of Skill Share activities at the Centre that includes Seed Saving and Gardening from 10am, and Planetary Health Bushcare from 1.30pm. You can book in for Bushcare here (link in profile): https://bit.ly/49k8PPo Contact Lis on 0407 437 553 for more information.
Rotarians 4 Planetary Health will be meeting again at the Planetary Health Centre at 6pm on Monday 27 October. Register at this link if you`d like to attend! (link in profile) https://events.humanitix.com/rotarians-4-planetary-health-l7bb4qhr?
Thank you to everyone who popped by for the @ediblegardentrailbluemountains today! It was a great day discussing gardens, ponds, frogs, seeds, composting seats, wicking beds and how to restore the hydrological cycle! Next Saturday will be our Skill Share Saturday. We`ll be kickstarting a 6-week block of Tai Chi & Qigong at 9am, launching our Seed Saving and Gardening Group at 10am and running our monthly Bushcare Group at 1.30pm. You can book in for Tai Chi here (link in profile): https://events.humanitix.com/tai-chi-and-qigong-six-week-block-spring-2025-qaw2ts2v and to Bushcare here (link also in profile): https://events.humanitix.com/planetary-health-bushcare-spring-summer-2025
The Murray crayfish disappeared from large parts of its range over the past 40 years. Now a community-driven reintroduction program is bringing the iconic species back.
