I am starting here with a quote from Jeff Ollerton’s Biodiversity Blog – “A recent assessment by ecologists at the University of Sydney has suggested that almost half a billion reptiles, mammals and birds have been killed so far by the fires.” This assessment by University of Sydney ecologists was made in December before the devastating fires raged through south-eastern NSW and eastern Victoria over the New Year period, so the true figures are likely to have grown substantially since than and will continue to grow over this devastating fire season. Losses of insects, including pollinators, will be even greater. These losses will number in the billions of individuals but what we will never know will be how many locally-endemic species are lost forever, and how much genetic biodiversity is lost in the surviving species. Our lab is working in several areas monitoring pollinator recovery after fire but recovery of both plants and pollinators is being hampered by the ongoing drought conditions. In the Howell Shrubland Endangered Ecological Community, for example, where we have been working since 2007, neither plants nor pollinators are recovering.

Howell Shrubland in a good year
Howell Shrubland nine months after fire in 2019 – without the shrubs! The recovery of this community is being hampered by drought.

We recorded a very low spike of pollinator numbers in the burnt area that correlated with the growth and flowering of very small numbers of fire-ephemeral plants. In fact, we recorded more pollinators in the burnt area than in the adjoining unburnt area (where there were no fire ephemerals and the other plants were not flowering in spite of the fact that it was the normal flowering season). We presented this information at the Ecological Society of Australia meeting in Launceston in November 2019. It will be very interesting to see what recovery occurs once normal rains return.

One thought on “The bushfires and the threats to biodiversity

  1. Thanks David, I hadn’t realised that the UoS assessment was done so long ago. I hate to think what the true figure is now. Good luck with the post-fire pollinator surveys, it will be fascinating and important to see whether the communities can rebound after such devastation.

    Like

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s