Inland waterways brimming with invertebrates despite drying trend

June 26, 2014 by Kerry Faulkner
Aquatic invertebrates found ranged from beetles, damselflies and dragonflies. Pictured: blue skimmer dragonfly (Libellulidae>Orthetrum caledonicum) Credit: Bill & Mark Bell

The observations of the nation's early explorers have been used by ecologists investigating the survival of aquatic invertebrates in the waterways of Australia's arid interior.

The team of ecologists found a surprising number of species has survived over a 113-year period from 1895 to 2008 however the ancient waterholes could be indicators for assessing the impact of climate change on biodiversity in arid Australia.

Central Australia has experienced one of the most rapid rates of warming on the Australian continent with annual maximum temperatures recorded in Alice Springs increasing two degrees since 1900.

The project team was lead by Northern Territory Department of Land Resource Management water ecologist Jayne Brim-Box with statistical analysis by Murdoch University disturbance ecologist Karin Strehlow.

Dr Brim-Box led a survey of 16 sites in 2008 at small permanent spring fed streams and larger riverine pools in the remote Finke Gorge, Watarrka and West MacDonnel national parks, comparing the results to previous surveys undertaken at the same sites in either 1986 or 1994.

The most recent sampling involved six 20 second sweeps with long-handled 250-micron mesh nets, collecting samples from all available habitat types to maximise the number of species encountered.

In addition, were hand-picked with forceps from rocks and wood at the springs where water was only present as a thin flowing film. Physiochemical variables like conductivity, temperature and pH were recorded at each site in each of the three survey periods.

Desert invertebrates coping well 
A comparison of the data with the records of the 1894 Horn Expedition—Australia's first scientific expedition to the region—showed all taxa 113 years later, except for a small number of species. The largest number of aquatic invertebrates was beetles, dragonflies and damselflies.

Dr Strehlow who 'crunched the numbers' says that's good news for the ecology of the region.

"It is quiet surprising that we haven't lost more, so it really is an indication of how resilient some of these taxa are that they can persist and that would be because they have developed a lot of strategies to cope with that drying climate.

"The climate has changed a lot and the system is not what it used to be; thousands of years ago when the Finke River was big and flowing some species would have been more common but now literally we are talking about little pools of air where they are just hanging in there."

"We are finding the same thing here in WA with the aquatic invertebrates, as our wetlands are drying, especially in the Perth metropolitan area the invertebrates are persisting."

Explore further: Threats loom for Australia's outback biodiversity

More information: Brim-Box, J., Davis, J., Strehlow, K., McBurnie, G., Duguid, A., Brock, C., McConnell, K., Day, C., and Palmer, C. (2014). "Persistence of central Australian aquatic invertebrate communities." Marine and Freshwater Research 65, 562–572.

Related Stories

Climate change threatens freshwater fish

January 10, 2014

( —New research has revealed that Western Australia's drying climate will impact fish migrations, putting further pressure on a number of native freshwater fish species.

Recommended for you

Male dolphins offer gifts to attract females

November 21, 2017

Researchers from The University of Western Australia have captured a rare sexual display: evidence of male humpback dolphins presenting females with large marine sponges in an apparent effort to mate.

Study identifies new malaria parasites in wild bonobos

November 21, 2017

Malaria parasites, although widespread among wild chimpanzees and gorillas, have not been detected in bonobos, a chimp cousin. Reasoning that previous studies may have missed infected bonobo populations, a team led by Beatrice ...

The strange case of the scuba-diving fly

November 20, 2017

More than a century ago, American writer Mark Twain observed a curious phenomenon at Mono Lake, just to the east of Yosemite National Park: enormous numbers of small flies would crawl underwater to forage and lay eggs, but ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.