Nav: Home

Trapdoor spiders disappearing from Australian landscape

December 08, 2016

Recent surveys by Australian scientists have identified an apparent significant decline in the numbers of trapdoor spiders across southern Australia.

Famous for their carefully camouflaged burrows - some with lids or 'trapdoors' from which they launch themselves to catch their prey - trapdoor spiders are remarkable animals. The females of some species are known to live in the same burrow for more than 25 years.

Led by the University of Adelaide, in collaboration with the Western Australian Museum, the Queensland Museum, the Department of Parks and Wildlife (WA) and The University of Western Australia, the scientists have compared numbers of trapdoors at various locations across Australia's southern agricultural and arid zones with survey data from the 1950s to the present. The findings have been published in the journal Austral Entomology.

"We have good historical records of trapdoor spiders going back 60 years which showed population numbers were reasonably good, but recent surveys of the same areas show numbers are extremely low, and in some cases spiders are completely absent," says project leader Professor Andrew Austin, from the University of Adelaide's Australian Centre for Evolution Biology and Biodiversity.

Trapdoor spiders are sometimes encountered in domestic gardens in towns and cities around Australia when they emerge from their burrows to feed or look for a mate.

However, these represent just a few common species, when in fact there are several hundred species found in particular habitats, most of which haven't even received a formal scientific name.

Now there is concern that this major and unique component of Australia's fauna may be threatened.

"The problem in some areas looks to be that the few spiders surviving are old females, and an absence of males means there is no capacity to reproduce, and they eventually die and the population disappears," says team member Dr Mark Harvey, a national expert on spiders based at the Western Australian Museum.

"The reasons for this decline are probably complex but are undoubtedly linked to a century of intensive land clearing and the fact that trapdoor spiders are susceptible to soil disturbance around their burrows."

Lead author Dr Mike Rix, who did his research at the University of Adelaide and is now at the Queensland Museum, says the results of this research are concerning on their own, but may also be representative of a decline in populations of other invertebrate animals.

"To get a better handle on the extent of the problem, there is a real need for more detailed follow up surveys, including to assess where remnant populations still exist," he says.
-end-
This research was funded by the Australian Research Council, with additional support from BHP Billiton, Rio Tinto, Biota Environmental Sciences, the South Australian Museum, and the Western Australian Museum.

Media Contact:

Professor Andy Austin, University of Adelaide. Mobile: +61 (0) 438 378 151, andy.austin@adelaide.edu.au

Dr Mike Rix, former University of Adelaide, now at Queensland Museum. Mobile: +61 (0) 407 694 713, michael.rix@qm.qld.gov.au

Robyn Mills, Media Officer, Phone: +61 (0)8 8313 6341, Mobile: +61 (0)410 689 084, robyn.mills@adelaide.edu.au

Dr Mark Harvey, Western Australian Museum. Contact via WA Museum Media and Publicity Officer Sharna Craig. Phone: + 61 8 6552 7897. Mobile: +61 (0) 466 304 807, sharna.craig@museum.wa.gov.au

University of Adelaide

Related Research Articles:

More Research News and Research Current Events

Best Science Podcasts 2019

We have hand picked the best science podcasts for 2019. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

Teaching For Better Humans
More than test scores or good grades — what do kids need to prepare them for the future? This hour, guest host Manoush Zomorodi and TED speakers explore how to help children grow into better humans, in and out of the classroom. Guests include educators Olympia Della Flora and Liz Kleinrock, psychologist Thomas Curran, and writer Jacqueline Woodson.
Now Playing: Science for the People

#535 Superior
Apologies for the delay getting this week's episode out! A technical glitch slowed us down, but all is once again well. This week, we look at the often troubling intertwining of science and race: its long history, its ability to persist even during periods of disrepute, and the current forms it takes as it resurfaces, leveraging the internet and nationalism to buoy itself. We speak with Angela Saini, independent journalist and author of the new book "Superior: The Return of Race Science", about where race science went and how it's coming back.